Cypress Semiconductor CY7C1338G Bedienungsanleitung

4-Mbit (128K x 32) Flow-Through Sync SRAM

CY7C1338G

Cypress Semiconductor Corporation • 198ChampionCourt • San Jose,CA 95134-1709 • 408-943-2600

Document #: 38-05521 Rev. *D Revised July 5, 2006

Features

• 128K x 32 common I/O

• 3.3V core power supply (VDD)

• 2.5V or 3.3V I/O supply (VDDQ)

• Fast clock-to-output times

— 6.5 ns (133-MHz version)

• Provide high-performance 2-1-1-1 access rate

•User-selectable burst counter supporting Intel®

Pentium®interleaved or linear burst sequences

• Separate processor and controller address strobes

• Synchronous self-timed write

• Asynchronous output enable

• Offered in lead-free 100-Pin TQFP package, lead-free

and non-lead-free 119-Ball BGA package

• “ZZ” Sleep Mode option

Functional Description[1]

The CY7C1338G is a 128K x 32 synchronous cache RAM

designed to interface with high-speed microprocessors with

minimum glue logic. Maximum access delay from clock rise is

6.5 ns (133-MHz version). A 2-bit on-chip counter captures the

first address in a burst and increments the address automati-

cally for the rest of the burst access. All synchronous inputs

are gated by registers controlled by a positive-edge-triggered

Clock Input (CLK). The synchronous inputs include all

addresses, all data inputs, address-pipelining Chip Enable

(CE1), depth-expansion Chip Enables (CE2and CE3), Burst

Control inputs (ADSC, ADSP, and ADV), Write Enables

(BW[A:D], and BWE), and Global Write (GW). Asynchronous

inputs include the Output Enable (OE) and the ZZ pin.

The CY7C1338G allows either interleaved or linear burst

sequences, selected by the MODE input pin. A HIGH selects

an interleaved burst sequence, while a LOW selects a linear

burst sequence. Burst accesses can be initiated with the

Processor Address Strobe (ADSP) or the cache Controller

Address Strobe (ADSC) inputs. Address advancement is

controlled by the Address Advancement (ADV) input.

Addresses and chip enables are registered at rising edge of

clock when either Address Strobe Processor (ADSP) or

Address Strobe Controller (ADSC) are active. Subsequent

burst addresses can be internally generated as controlled by

the Advance pin (ADV).

The CY7C1338G operates from a +3.3V core power supply

while all outputs may operate with either a +2.5 or +3.3V

supply. All inputs and outputs are JEDEC-standard

JESD8-5-compatible.

Note:

1. For best-practices recommendations, please refer to the Cypress application note System Design Guidelines on www.cypress.com.

ADDRESS

BURST

COUNTER

AND LOGIC

CLR

ENABLE

SENSE

AMPS

OUTPUT

BUFFERS

INPUT

REGISTERS

MEMORY

ARRAY

MODE A

[1:0]

0, A1, A

ADV

CLK

ADSP

ADSC

BWE

CE1

CE2

CE3

SLEEP

CONTROL

BYTE

WRITE REGISTER

BYTE

WRITE REGISTER

BYTE

WRITE REGISTER

BYTE DQ

BYTE

WRITE REGISTER

BYTE

WRITE REGISTER

BYTE

WRITE REGISTER

BYTE

WRITE REGISTER

Logic Block Diagram

CY7C1338G

Document #: 38-05521 Rev. *D Page 2 of 17

Selection Guide

133 MHz 100 MHz Unit

Maximum Access Time 6.5 8.0 ns

Maximum Operating Current 225 205 mA

Maximum Standby Current 40 40 mA

Pin Configurations 100-Pin TQFP Pinout

NC/72M

NC/36M

VSS

VDD

NC/9M

DQB

VDDQ

VSSQ

DQB

VSSQ

VDDQ

DQB

VSS

VDD

DQA

VDDQ

VSSQ

DQA

VSSQ

VDDQ

DQA

DQC

VDDQ

VSSQ

DQC

VSSQ

VDDQ

DQC

VDD

VSS

DQD

VDDQ

VSSQ

DQD

VSSQ

VDDQ

DQD

CE1

CE2

BWD

BWC

BWB

BWA

CE3

VDD

VSS

CLK

BWE

ADSP

100

BYTE A

BYTE C

AADV

ADSC

MODE

NC/18M

BYTE B

DQB

BYTE D

CY7C1338G

Document #: 38-05521 Rev. *D Page 3 of 17

Pin Definitions

Name I/O Description

A0, A1, A Input-

Synchronous Address Inputs used to select one of the 128K address locations. Sampled at the rising edge

of the CLK if ADSP or ADSC is active LOW, and CE1,CE2, andCE3 are sampled active. A[1:0] feed

the 2-bit counter.

BWA, BWB

BWC, BWDInput-

Synchronous Byte Write Select Inputs, active LOW. Qualified with BWE to conduct byte writes to the SRAM.

Sampled on the rising edge of CLK.

GW Input-

Synchronous Global Write Enable Input, active LOW. When asserted LOW on the rising edge of CLK, a global

write is conducted (ALL bytes are written, regardless of the values on BW[A:D] and BWE).

BWE Input-

Synchronous Byte Write Enable Input, active LOW. Sampled on the rising edge of CLK. This signal must be

asserted LOW to conduct a byte write.

CLK Input-Clock Clock Input. Used to capture all synchronous inputs to the device. Also used to increment the burst

counter when ADV is asserted LOW, during a burst operation.

CE1Input-

Synchronous Chip Enable 1 Input, active LOW. Sampled on the rising edge of CLK. Used in conjunction with

CE2and CE3to select/deselect the device. ADSP is ignored if CE1is HIGH. CE1is sampled only

when a new external address is loaded.

CE2Input-

Synchronous Chip Enable 2 Input, active HIGH. Sampled on the rising edge of CLK. Used in conjunction with

CE1and CE3to select/deselect the device. CE2is sampled only when a new external address is

loaded.

CE3Input-

Synchronous Chip Enable 3 Input, active LOW. Sampled on the rising edge of CLK. Used in conjunction with

CE1and CE2to select/deselect the device. CE3 is sampled only when a new external address is

loaded.

OE Input-

Asynchronous Output Enable, asynchronous input, active LOW. Controls the direction of the I/O pins. When

LOW, the I/O pins behave as outputs. When deasserted HIGH, I/O pins are tri-stated, and act as

inputdatapins.OE ismaskedduringthefirst clockofa readcycle whenemergingfroma deselected

state.

ADV Input-

Synchronous Advance Input signal, sampled on the rising edge of CLK. When asserted, it automatically

increments the address in a burst cycle.

Pin Configurations (continued)

2345671

DDQ

NC/288M

NC/144M NCDQ

AA AA

ADSP V

DDQ

NC V

DDQ

CLK

NC/576M

NC/1G

NCNCNCNC NC/36MNC/72M NC

DDQ

AAAA

NC/9M

AA0

ADSC

ADV

MODE

NC V

BWE

119-Ball BGA Pinout

CY7C1338G

Document #: 38-05521 Rev. *D Page 4 of 17

Functional Overview

All synchronous inputs pass through input registers controlled

by the rising edge of the clock. Maximum access delay from

the clock rise (tC0) is 6.5 ns (133-MHz device).

The CY7C1338G supports secondary cache in systems

utilizing either a linear or interleaved burst sequence. The

interleaved burst order supports Pentium and i486™

processors. The linear burst sequence is suited for processors

that utilize a linear burst sequence. The burst order is

user-selectable, and is determined by sampling the MODE

input. Accesses can be initiated with either the Processor

Address Strobe (ADSP) or the Controller Address Strobe

(ADSC). Address advancement through the burst sequence is

controlled by the ADV input. A two-bit on-chip wraparound

burst counter captures the first address in a burst sequence

and automatically increments the address for the rest of the

burst access.

Byte write operations are qualified with the Byte Write Enable

(BWE) and Byte Write Select (BW[A:D]) inputs. A Global Write

Enable (GW) overrides all byte write inputs and writes data to

all four bytes. All writes are simplified with on-chip

synchronous self-timed write circuitry.

Three synchronous Chip Selects (CE1, CE2, CE3) and an

asynchronous Output Enable (OE) provide for easy bank

selection and output tri-state control. ADSP is ignored if CE1

is HIGH.

Single Read Accesses

A single read access is initiated when the following conditions

are satisfied at clock rise: (1) CE1, CE2, and CE3are all

asserted active, and (2) ADSP or ADSC is asserted LOW (if

the access is initiated by ADSC, the write inputs must be

deasserted during this first cycle). The address presented to

the address inputs is latched into the address register and the

burst counter/control logic and presented to the memory core.

If the OE input is asserted LOW, the requested data will be

available at the data outputs a maximum to tCDV after clock

rise. ADSP is ignored if CE1is HIGH.

ADSP Input-

Synchronous Address Strobe from Processor, sampled on the rising edge of CLK, active LOW. When

asserted LOW, addresses presented to the device are captured in the address registers. A[1:0] are

also loaded into the burst counter. When ADSP and ADSC are both asserted, only ADSP is recog-

nized. ASDP is ignored when CE1is deasserted HIGH

ADSC Input-

Synchronous Address Strobe from Controller, sampled on the rising edge of CLK, active LOW. When asserted

LOW, addresses presented to the device are captured in the address registers. A[1:0] are also loaded

into the burst counter. When ADSP and ADSC are both asserted, only ADSP is recognized.

ZZ Input-

Asynchronous ZZ“sleep”Input,activeHIGH.WhenassertedHIGHplacesthedeviceinanon-time-critical“sleep”

condition with data integrity preserved. During normal operation, this pin has to be low or left floating.

ZZ pin has an internal pull-down.

DQs I/O-

Synchronous Bidirectional Data I/O lines. As inputs, they feed into an on-chip data register that is triggered by

the rising edge of CLK. As outputs, they deliver the data contained in the memory location specified

by the addresses presented during the previous clock rise of the read cycle. The direction of the

pins is controlled by OE. When OE is asserted LOW, the pins behave as outputs. When HIGH, DQs

are placed in a tri-state condition.

VDD Power

Supply Power supply inputs to the core of the device.

VSS Ground Ground for the core of the device.

VDDQ I/O Power

Supply Power supply for the I/O circuitry.

VSSQ I/O Ground Ground for the I/O circuitry.

MODE Input-

Static Selects Burst Order. When tied to GND selects linear burst sequence. When tied to VDD or left

floatingselectsinterleavedburstsequence.Thisisastrappinandshouldremainstaticduringdevice

operation. Mode Pin has an internal pull-up.

NC No Connects. Not Internally connected to the die.

NC/9M,

NC/18M

NC/36M

NC/72M,

NC/144M,

NC/288M,

NC/576M,

NC/1G

–No Connects. Not internally connected to the die. NC/9M,NC/18M,NC/36M,NC/72M, NC/144M,

NC/288M, NC/576M and NC/1G are address expansion pins that are not internally connected to

the die.

Pin Definitions (continued)

Name I/O Description

CY7C1338G

Document #: 38-05521 Rev. *D Page 5 of 17

Single Write Accesses Initiated by ADSP

This access is initiated when the following conditions are

satisfied at clock rise: (1) CE1, CE2, CE3are all asserted

active, and (2) ADSP is asserted LOW. The addresses

presented are loaded into the address register and the burst

inputs (GW, BWE, and BW[A:D])are ignored during this first

clock cycle. If the write inputs are asserted active (see Write

Cycle Descriptions table for appropriate states that indicate a

write) on the next clock rise, the appropriate data will be

latched and written into the device. Byte writes are allowed.

During byte writes, BWAcontrolsDQAand BWB controls DQB.

BWC controls DQC, and BWDcontrols DQD. All I/Os are

tri-stated during a byte write.Since this is a common I/O

device, the asynchronous OE input signal must be deasserted

and the I/Os must be tri-stated prior to the presentation of data

to DQs. As a safety precaution, the data lines are tri-stated

once a write cycle is detected, regardless of the state of OE.

Single Write Accesses Initiated by ADSC

This write access is initiated when the following conditions are

satisfied at clock rise: (1) CE1, CE2, and CE3are all asserted

active, (2) ADSC is asserted LOW, (3) ADSP is deasserted

HIGH, and (4) the write input signals (GW, BWE, and BW[A:D])

indicate a write access. ADSC is ignored if ADSP is active

LOW.

The addresses presented are loaded into the address register

and the burst counter/control logic and delivered to the

memory core. The information presented to DQ[A:D] will be

written into the specified address location. Byte writes are

allowed. During byte writes, BWAcontrols DQA, BWBcontrols

DQB, BWC controls DQC, and BWDcontrols DQD. All I/Os are

tri-statedwhenawriteis detected,even abytewrite. Sincethis

is a common I/O device, the asynchronous OE input signal

must be deasserted and the I/Os must be tri-stated prior to the

presentation of data to DQs. As a safety precaution, the data

lines are tri-stated once a write cycle is detected, regardless

of the state of OE.

Burst Sequences

The CY7C1338G provides an on-chip two-bit wraparound

burst counter inside the SRAM. The burst counter is fed by

A[1:0], and can follow either a linear or interleaved burst order.

The burst order is determined by the state of the MODE input.

A LOW on MODE will select a linear burst sequence. A HIGH

on MODE will select an interleaved burst order. Leaving

MODE unconnected will cause the device to default to a inter-

leaved burst sequence.

Sleep Mode

The ZZ input pin is an asynchronous input. Asserting ZZ

places the SRAM in a power conservation “sleep” mode. Two

clock cycles are required to enter into or exit from this “sleep”

mode. While in this mode, data integrity is guaranteed.

Accesses pending when entering the “sleep” mode are not

considered valid nor is the completion of the operation

guaranteed. The device must be deselected prior to entering

the “sleep” mode. CEs, ADSP, and ADSC must remain

inactive for the duration of tZZREC after the ZZ input returns

LOW.

Interleaved Burst Address Table

(MODE = Floating or VDD)

First

Address

A1, A0

Second

Address

A1, A0

Third

Address

A1, A0

Fourth

Address

A1, A0

00 01 10 11

01 00 11 10

10 11 00 01

11 10 01 00

Linear Burst Address Table (MODE = GND)

First

Address

A1,A0

Second

Address

A1,A0

Third

Address

A1,A0

Fourth

Address

A1,A0

00 01 10 11

01 10 11 00

10 11 00 01

11 00 01 10

ZZ Mode Electrical Characteristics

Parameter Description Test Conditions Min. Max. Unit

IDDZZ Sleep mode standby current ZZ > VDD – 0.2V 40 mA

tZZS Device operation to ZZ ZZ > VDD – 0.2V 2tCYC ns

tZZREC ZZ recovery time ZZ < 0.2V 2tCYC ns

tZZI ZZ active to sleep current This parameter is sampled 2tCYC ns

tRZZI ZZ Inactive to exit sleep current This parameter is sampled 0 ns

CY7C1338G

Document #: 38-05521 Rev. *D Page 6 of 17

Truth Table [2, 3, 4, 5, 6]

Cycle Description Address

Used CE1CE2CE3ZZ ADSP ADSC ADV WRITE OE CLK DQ

Deselected Cycle, Power-down None H X X L X L X X X L-H Tri-State

Deselected Cycle, Power-down None L L X L L X X X X L-H Tri-State

Deselected Cycle, Power-down None L X H L L X X X X L-H Tri-State

Deselected Cycle, Power-down None L L X L H L X X X L-H Tri-State

Deselected Cycle, Power-down None X X X L H L X X X L-H Tri-State

Sleep Mode, Power-down None X X X H X X X X X X Tri-State

Read Cycle, Begin Burst External L H L L L X X X L L-H Q

Read Cycle, Begin Burst External L H L L L X X X H L-H Tri-State

Write Cycle, Begin Burst External L H L L H L X L X L-H D

Read Cycle, Begin Burst External L H L L H L X H L L-H Q

Read Cycle, Begin Burst External L H L L H L X H H L-H Tri-State

Read Cycle, Continue Burst Next X X X L H H L H L L-H Q

Read Cycle, Continue Burst Next X X X L H H L H H L-H Tri-State

Read Cycle, Continue Burst Next H X X L X H L H L L-H Q

Read Cycle, Continue Burst Next H X X L X H L H H L-H Tri-State

Write Cycle, Continue Burst Next X X X L H H L L X L-H D

Write Cycle, Continue Burst Next H X X L X H L L X L-H D

Read Cycle, Suspend Burst Current X X X L H H H H L L-H Q

Read Cycle, Suspend Burst Current X X X L H H H H H L-H Tri-State

Read Cycle, Suspend Burst Current H X X L X H H H L L-H Q

Read Cycle, Suspend Burst Current H X X L X H H H H L-H Tri-State

Write Cycle, Suspend Burst Current X X X L H H H L X L-H D

Write Cycle, Suspend Burst Current H X X L X H H L X L-H D

Notes:

2. X = “Don't Care.” H = Logic HIGH, L = Logic LOW.

3. WRITE = L when any one or more Byte Write enable signals (BWA, BWB, BWC, BWD) and BWE = L or GW= L. WRITE = H when all Byte write enable signals

(BWA, BWB, BWC, BWD), BWE, GW = H.

4. The DQ pins are controlled by the current cycle and the OE signal. OE is asynchronous and is not sampled with the clock.

5. The SRAM always initiates a read cycle when ADSP is asserted, regardless of the state of GW, BWE, or BWX. Writes may occur only on subsequent clocks

after the ADSP or with the assertion of ADSC. As a result, OE must be driven HIGH prior to the start of the write cycle to allow the outputs to tri-state. OE is a

don't care for the remainder of the write cycle.

6. OE is asynchronous and is not sampled with the clock rise. It is masked internally during write cycles. During a read cycle all data bits are tri-state when OE is

inactive or when the device is deselected, and all data bits behave as output when OE is active (LOW).

CY7C1338G

Document #: 38-05521 Rev. *D Page 7 of 17

Partial Truth Table for Read/Write[2, 7]

Function GW BWE BWDBWCBWBBWA

Read HHXXXX

Read HLHHHH

WriteByteA HLHHHL

Write Byte B H L H H L H

Write Bytes B, A H L H H L L

WriteByteC HLHLHH

Write Bytes C, A H L H L H L

Write Bytes C, B H L H L L H

Write Bytes C, B, A H L H L L L

WriteByteD HLLHHH

Write Bytes D, A H L L H H L

Write Bytes D, B H L L H L H

Write Bytes D, B, A H L L H L L

Write Bytes D, B H L L L H H

Write Bytes D, B, A H L L L H L

WriteBytesD,C,A HLLLLH

WriteAllBytes HLLLLL

WriteAllBytes LXXXXX

Note:

7. Table only lists a partial listing of the byte write combinations. Any combination of BWXis valid. Appropriate write will be done based on which byte write is active.

CY7C1338G

Document #: 38-05521 Rev. *D Page 8 of 17

Maximum Ratings

(Above which the useful life may be impaired. For user guide-

lines, not tested.)

Storage Temperature .................................–65°C to +150°C

Ambient Temperature with

Power Applied.............................................–55°C to +125°C

Supply Voltage on VDD Relative to GND........–0.5V to +4.6V

Supply Voltage on VDDQ Relative to GND......–0.5V to +VDD

DC Voltage Applied to Outputs

in tri-state............................................ –0.5V to VDDQ + 0.5V

DC Input Voltage ...................................–0.5V to VDD + 0.5V

Current into Outputs (LOW).........................................20 mA

Static Discharge Voltage........................................... >2001V

(per MIL-STD-883, Method 3015)

Latch-up Current..................................................... >200mA

Operating Range

Range Ambient

Temperature]VDD VDDQ

Commercial 0°C to +70°C 3.3V −5%/+10% 2.5V –5%

to VDD

Industrial –40°C to+85°C

Electrical CharacteristicsOver the Operating Range [8, 9]

Parameter Description Test Conditions Min. Max. Unit

VDD Power Supply Voltage 3.135 3.6 V

VDDQ I/O Supply Voltage 2.375 VDD V

VOH Output HIGH Voltage for 3.3V I/O, IOH = –4.0 mA 2.4 V

for 2.5V I/O, IOH = –1.0 mA 2.0 V

VOL Output LOW Voltage for 3.3V I/O,IOL = 8.0 mA 0.4 V

for 2.5V I/O, IOL = 1.0 mA 0.4 V

VIH Input HIGH Voltage for 3.3V I/O 2.0 VDD + 0.3V V

for 2.5V I/O 1.7 VDD + 0.3V V

VIL Input LOW Voltage[8] for 3.3V I/O –0.3 0.8 V

for 2.5V I/O –0.3 0.7 V

IXInput Leakage Current

except ZZ and MODE GND ≤VI≤VDDQ −55µA

Input Current of MODE Input = VSS –30 µA

Input = VDD 5µA

Input Current of ZZ Input = VSS –5 µA

Input = VDD 30 µA

IOZ Output Leakage Current GND ≤VI≤VDDQ, Output Disabled –5 5 µA

IDD VDD Operating Supply

Current VDD = Max., IOUT = 0 mA,

f = fMAX= 1/tCYC 7.5-ns cycle, 133 MHz 225 mA

10-ns cycle, 100 MHz 205 mA

ISB1 Automatic CE

Power-Down

Current—TTL Inputs

Max. VDD, Device Deselected,

VIN ≥VIH or VIN ≤VIL, f = fMAX,

inputs switching

7.5-ns cycle, 133 MHz 90 mA

10-ns cycle, 100 MHz 80 mA

ISB2 Automatic CE

Power-Down

Current—CMOS Inputs

Max. VDD, Device Deselected,

VIN ≥VDD – 0.3V or VIN ≤0.3V,

f = 0, inputs static

All speeds 40 mA

ISB3 Automatic CE

Power-Down

Current—CMOS Inputs

Max. VDD, Device Deselected,

VIN ≥VDDQ – 0.3V or VIN ≤

0.3V,

f = fMAX, inputs switching

7.5-ns cycle, 133 MHz 75 mA

10-ns cycle, 100 MHz 65 mA

ISB4 Automatic CE

Power-Down

Current—TTL Inputs

Max. VDD, Device Deselected,

VIN ≥VDD – 0.3V or VIN ≤0.3V,

f = 0, inputs static

All speeds 45 mA

Notes:

8. Overshoot: VIH(AC) < VDD +1.5V (Pulse width less than tCYC/2), undershoot: VIL(AC) > –2V (Pulse width less than tCYC/2).

9. TPower-up: Assumes a linear ramp from 0V to VDD(min.) within 200 ms. During this time VIH < VDD and VDDQ <VDD.

CY7C1338G

Document #: 38-05521 Rev. *D Page 9 of 17

Capacitance[10]

Parameter Description Test Conditions 100 TQFP

Max. 119 BGA

Max. Unit

CIN Input Capacitance TA= 25°C, f = 1 MHz,

VDD = 3.3V.

VDDQ = 3.3V

55pF

CCLK Clock Input Capacitance 5 5 pF

CI/O Input/Output Capacitance 5 7 pF

Thermal Resistance[10]

Parameter Description Test Conditions 100 TQFP

Package 119 BGA

Package Unit

ΘJA Thermal Resistance

(Junction to Ambient) Testconditionsfollowstandardtest

methods and procedures for

measuringthermalimpedance,per

EIA/JESD51.

30.32 34.1 °C/W

ΘJC Thermal Resistance

(Junction to Case) 6.85 14.0 °C/W

AC Test Loads and Waveforms

Note:

10.Tested initially and after any design or process change that may affect these parameters.

OUTPUT

R = 317Ω

R = 351Ω

5pF

INCLUDING

JIG AND

SCOPE

(a) (b)

OUTPUT

RL= 50Ω

Z0= 50Ω

= 1.5V

3.3V ALL INPUT PULSES

VDDQ

GND

90%

10% 90%

10%

≤1 ns ≤1 ns

(c)

OUTPUT

R = 1667Ω

R =1538Ω

5pF

INCLUDING

JIG AND

SCOPE

(a) (b)

OUTPUT

RL= 50Ω

Z0= 50Ω

VT= 1.25V

2.5V ALL INPUT PULSES

VDDQ

GND

90%

10% 90%

10%

≤1ns ≤1ns

(c)

3.3V I/O Test Load

2.5V I/O Test Load

CY7C1338G

Document #: 38-05521 Rev. *D Page 10 of 17

Switching Characteristics Over the Operating Range [11, 12, 13, 14, 15, 16]

Parameter Description

–133 –100

UnitMin. Max. Min. Max.

tPOWER VDD(Typical) to the first Access[11] 11ms

Clock

tCYC Clock Cycle Time 7.5 10 ns

tCH Clock HIGH 2.5 4.0 ns

tCL Clock LOW 2.5 4.0 ns

Output Times

tCDV Data Output Valid After CLK Rise 6.5 8.0 ns

tDOH Data Output Hold After CLK Rise 2.0 2.0 ns

tCLZ Clock to Low-Z[12, 13, 14] 00ns

tCHZ Clock to High-Z[12, 13, 14] 3.5 3.5 ns

tOEV OE LOW to Output Valid 3.5 3.5 ns

tOELZ OE LOW to Output Low-Z[12, 13, 14] 00ns

tOEHZ OE HIGH to Output High-Z[12, 13, 14] 3.5 3.5 ns

Setup Times

tAS Address Set-up Before CLK Rise 1.5 2.0 ns

tADS ADSP, ADSC Set-up Before CLK Rise 1.5 2.0 ns

tADVS ADV Set-up Before CLK Rise 1.5 2.0 ns

tWES GW, BWE, BWXSet-up Before CLK Rise 1.5 2.0 ns

tDS Data Input Set-up Before CLK Rise 1.5 1.5 ns

tCES Chip Enable Set-up 1.5 2.0 ns

Hold Times

tAH Address Hold After CLK Rise 0.5 0.5 ns

tADH ADSP, ADSC Hold After CLK Rise 0.5 0.5 ns

tWEH GW, BWE, BWXHold After CLK Rise 0.5 0.5 ns

tADVH ADV Hold After CLK Rise 0.5 0.5 ns

tDH Data Input Hold After CLK Rise 0.5 0.5 ns

tCEH Chip Enable Hold After CLK Rise 0.5 0.5 ns

Notes:

11. This parthas a voltage regulator internally;tPOWER is the time that the power needs to be supplied above VDD(minimum) initially before a read or write operation

can be initiated.

12.tCHZ, tCLZ,tOELZ, and tOEHZ are specifiedwith AC test conditions shown in part(b) of AC Test Loads. Transition is measured ± 200 mV from steady-state voltage.

13.At any given voltage and temperature, tOEHZ is less than tOELZ and tCHZ is less than tCLZ to eliminate bus contention between SRAMs when sharing the same

data bus. These specifications do not imply a bus contention condition, but reflect parameters guaranteed over worst case user conditions. Device is designed

to achieve High-Z prior to Low-Z under the same system conditions.

14.This parameter is sampled and not 100% tested.

15.Timing reference level is 1.5V when VDDQ = 3.3V and is 1.25V when VDDQ = 2.5V.

16.Test conditions shown in (a) of AC Test Loads unless otherwise noted.

Inhaltsverzeichnis

Andere Cypress Semiconductor Computerhardware Handbücher

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