Integrated Device Technology Inc IDT71256SA70P, IDT71256SA70PZ, IDT71256SA70TP, IDT71256SA70Y Datasheet

Integrated Device Technology, Inc.

FEATURES:

• 32K x 8 CMOS static RAM

• Equal access and cycle times

-- Commercial: 70ns

• One Chip Select plus one Output Enable pin

• Bidirectional data inputs and outputs directly
TTL-compatible

• Low power consumption via chip deselect

• Available in 28-pin 30 mil Plastic SOJ, 28-pin 300 mil
Plastic Dip, 28-pin 300 mil TSOP Type I, and 28-pin 600
mil Plastic Dip.

DESCRIPTION:

The IDT71256SA is a 262,144-bit medium-speed Static
RAM organized as 32K x 8. It is fabricated using IDT’s high­perfomance, high-reliability CMOS technology. This state-of­the-art technology, combined with innovative circuit design
techniques, provides a cost-effective solution for your memory
needs.

All bidirectional inputs and outputs of the IDT71256SA are
TTL-compatible and operation is from a single 5V supply.
Fully static asynchronous circuitry is used, requiring no clocks
or refresh for operation.

The IDT71256SA is packaged in a 28-pin 300 mil Plastic
SOJ, 28-pin 300 mil Plastic Dip, 28-pin 300 mil TSOP Type I
and 28-pin 600 mil Plastic Dip.

FUNCTIONAL BLOCK DIAGRAM

1

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

COMMERCIAL TEMPERATURE RANGE JULY 1996

1996 Integrated Device Technology, Inc. 3567/1

A

ADDRESS

DECODER

262,144 BIT

MEMORY ARRAY

I/O CONTROL

3567 drw 01

INPUT

DATA

CIRCUIT

WE

CS

V

CC

GND

0

A14

I/O 0

I/O

7

CONTROL

CIRCUIT

OE

CMOS STATIC RAM
256K (32K x 8-BIT)

IDT71256SA70

IDT71256SA70
CMOS STATIC RAM 256K (32K x 8-BIT) COMMERCIAL TEMPERATURE RANGES

2

PIN CONFIGURATION

CAPACITANCE

(TA = +25°C, f = 1.0MHz, SOJ package)

Symbol Parameter

(1)

Conditions Max. Unit

C

IN Input Capacitance VIN = 3dV 11 pF

C

I/O I/O Capacitance VOUT = 3dV 11 pF

NOTE: 3567 tbl 03

1. This parameter is guaranteed by device characterization, but not prod-

uction tested.

3567 tbl 05

DC ELECTRICAL CHARACTERISTICS

VCC = 5.0V ± 10%

IDT71256SA

Symbol Parameter Test Condition Min. Max. Unit

|I

LI| Input Leakage Current VCC = Max., VIN = GND to VCC — 5 µA

|I

LO| Output Leakage Current VCC = Max.,

CS

= VIH, VOUT = GND to VCC — 5 µA

V

OL Output Low Voltage IOL = 8mA, VCC = Min. — 0.4 V

V

OH Output High Voltage IOH = –4mA, VCC = Min. 2.4 — V

TRUTH TABLE

(1,2)

CSCSOEOEWEWE I/O Function

L L H DATA

OUT Read Data

L X L DATA

IN Write Data

L H H High-Z Outputs Disabled

H X X High-Z Deselected — Standby (I

SB)

V

HC X X High-Z Deselected — Standby (ISB1)

NOTES: 3567 tbl 04

1. H = VIH, L = VIL, x = Don't care.

2. V

LC = 0.2V, VHC = VCC –0.2V.

3. Other inputs ≥V

HC or ≤VLC.

(3)

RECOMMENDED DC OPERATING
CONDITIONS

Symbol Parameter Min. Typ. Max. Unit

V

CC Supply Voltage 4.5 5.0 5.5 V

GND Supply Voltage 0 0 0 V
V

IH Input High Voltage 2.2 — VCC+0.5 V

V

IL Input Low Voltage –0.5

(1)

— 0.8 V

NOTE: 3567 tbl 01

1. VIL (min.) = –1.5V for pulse width less than 10ns, once per cycle.

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol Rating Com’l. Unit

V

TERM

(2)

Terminal Voltage –0.5 to +7.0 V
with Respect
to GND

T

A Operating 0 to +70 °C

Temperature

T

BIAS Temperature –55 to +125 °C

Under Bias

T

STG Storage –55 to +125 °C

Temperature

P

T Power 1.0 W

Dissipation

I

OUT DC Output 50 mA

Current

NOTES: 3567 tbl 02

1. Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other
conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.

3567 drw 02

5
6
7
8

9
10
11
12

GND

1

2

3

4

24
23

22
21

20
19

18
17

SO28-5

P28-1
P28-2

13
14

28
27
26
25

A7
A6
A5
A4
A3
A2
A1

A0
I/O0
I/O1
I/O2

VCC

A14

WE

A

13

A8

A10

A11

OE

A

12

CS

I/O

7

I/O6
I/O5
I/O4
I/O3

A9

16
15

SOJ/DIP

TOP VIEW

3567 drw 03

22
23
24
25
26
27
28
1
2
3
4
5

7

6

21
20
19
18
17
16
15
14
13
12
11
10

9
8

A10

CS

I/O

7

I/O6
I/O5
I/O4
I/O3
GND
I/O

2

I/O1
I/O0
A0
A1
A2

SO28-8

OE

A

11

A9
A8

A13

A14

A7
A6
A5
A4
A3

A12

WE

V

CC

TSOP

TOP VIEW