ISSI IS62C256-70TI, IS62C256-45UI, IS62C256-45U, IS62C256-45TI, IS62C256-45T Datasheet

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IS62C256

ISSI®

32K x 8 LOW POWER CMOS STATIC RAM

 

FEATURES

Access time: 45, 70 ns

Low active power: 200 mW (typical)

Low standby power

250 W (typical) CMOS standby

28 mW (typical) TTL standby

Fully static operation: no clock or refresh required

TTL compatible inputs and outputs

Single 5V power supply

DESCRIPTION

The ISSI IS62C256 is a low power, 32,768 word by 8-bit CMOS static RAM. It is fabricated using ISSI's highperformance, low power CMOS technology.

When CSis HIGH (deselected), the device assumes a standby mode at which the power dissipation can be reduced down to 250 W (typical) at CMOS input levels.

Easy memory expansion is provided by using an active LOW Chip Select (CS) input and an active LOW Output Enable (OE) input. The active LOW Write Enable (WE) controls both writing and reading of the memory.

The IS62C256 is pin compatible with other 32K x 8 SRAMs in plastic SOP or TSOP (Type I) package.

FUNCTIONAL BLOCK DIAGRAM

A0-A14

 

 

32K X 8

DECODER

 

 

MEMORY ARRAY

 

 

 

 

 

 

 

VCC

GND

I/O

I/O0-I/O7 DATA COLUMN I/O

CIRCUIT

CS

CONTROL

OE CIRCUIT

WE

ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any errors which may appear in this publication. © Copyright 1999, Integrated Silicon Solution, Inc.

Integrated Silicon Solution, Inc. — 1-800-379-4774

1

SR072-1E 05/12/99

ISSI IS62C256-70TI, IS62C256-45UI, IS62C256-45U, IS62C256-45TI, IS62C256-45T Datasheet

IS62C256

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ISSI®

PIN CONFIGURATION

 

 

 

 

 

 

 

 

PIN CONFIGURATION

 

 

 

 

 

 

28-Pin SOP

 

 

 

 

 

 

 

 

 

28-Pin TSOP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A14

 

 

1

28

 

VCC

 

 

 

 

 

 

 

21

 

A10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OE

22

 

 

 

 

 

 

27

 

 

 

 

 

 

 

 

 

 

 

A12

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WE

 

 

A11

 

23

20

 

 

CS

 

 

 

 

26

 

A13

 

 

 

A9

 

24

19

 

I/O7

 

A7

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

A6

 

 

4

25

 

A8

 

 

 

A8

 

25

18

 

I/O6

 

A5

 

 

5

24

 

A9

 

A13

26

17

 

I/O5

 

 

 

 

 

 

 

27

16

 

I/O4

 

 

 

 

 

 

WE

 

 

 

 

 

 

A4

 

 

6

23

 

A11

 

VCC

 

28

15

 

I/O3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A14

 

1

14

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A3

 

 

7

22

 

OE

 

 

 

 

A12

 

2

13

 

I/O2

 

A2

 

 

8

21

 

A10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A7

 

3

12

 

I/O1

 

 

 

 

 

 

 

 

 

 

 

 

 

A1

 

 

9

20

 

CS

 

 

 

A6

 

4

11

 

I/O0

 

A0

 

 

10

19

 

I/O7

 

 

 

A5

 

10

 

A0

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

I/O0

 

 

11

18

 

I/O6

 

 

 

A4

 

6

9

 

A1

 

 

 

 

 

 

 

 

 

 

A3

 

7

8

 

A2

 

I/O1

 

 

12

17

 

I/O5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16

 

I/O4

 

 

 

 

 

 

 

 

 

 

 

 

 

I/O2

 

 

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

 

I/O3

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN DESCRIPTIONS

A0-A14

Address Inputs

CS

Chip Select Input

 

 

OE

Output Enable Input

 

 

WE

Write Enable Input

 

 

I/O0-I/O7

Input/Output

 

 

Vcc

Power

 

 

GND

Ground

 

 

TRUTH TABLE

Mode

WE

CS

OE

I/O Operation

Vcc Current

Not Selected

X

H

X

High-Z

ISB1, ISB2

(Power-down)

 

 

 

 

 

Output Disabled

H

L

H

High-Z

ICC1, ICC2

Read

H

L

L

DOUT

ICC1, ICC2

Write

L

L

X

DIN

ICC1, ICC2

 

 

 

 

 

 

ABSOLUTE MAXIMUM RATINGS(1)

Symbol

Parameter

Value

Unit

VTERM

Terminal Voltage with Respect to GND

–0.5 to +7.0

V

 

 

 

 

TBIAS

Temperature Under Bias

–55 to +125

°C

TSTG

Storage Temperature

–65 to +150

°C

PT

Power Dissipation

0.5

W

 

 

 

 

IOUT

DC Output Current (LOW)

20

mA

 

 

 

 

Note:

1.Stress 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.

2

Integrated Silicon Solution, Inc. — 1-800-379-4774

SR072-1E 05/12/99

IS62C256

 

 

 

 

 

ISSI®

OPERATING RANGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Range

 

Ambient Temperature

VCC

 

 

 

 

Commercial

0°C to +70°C

 

5V ± 10%

 

 

 

 

Industrial

–40°C to +85°C

 

5V ± 10%

 

 

 

 

DC ELECTRICAL CHARACTERISTICS

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

Parameter

Test Conditions

 

Min.

Max.

Unit

 

 

 

 

 

 

 

VOH

Output HIGH Voltage

VCC = Min., IOH = –1.0 mA

 

2.4

V

 

 

 

 

 

 

 

VOL

Output LOW Voltage

VCC = Min., IOL = 2.1 mA

 

0.4

V

 

 

 

 

 

 

 

 

VIH

Input HIGH Voltage

 

 

 

2.2

VCC + 0.5

V

 

 

 

 

 

 

 

 

VIL

Input LOW Voltage(1)

 

 

 

–0.3

0.8

V

ILI

Input Leakage

GND VIN VCC

Com.

–2

2

A

 

 

 

 

 

Ind.

–10

10

 

ILO

Output Leakage

GND VOUT VCC,

Com.

–2

2

A

 

 

 

Outputs Disabled

Ind.

–10

10

 

Note:

1. VIL = –3.0V for pulse width less than 10 ns.

POWER SUPPLY CHARACTERISTICS(1) (Over Operating Range)

 

 

 

 

-45 ns

-70 ns

 

Symbol

Parameter

Test Conditions

 

Min. Max.

Min.

Max.

Unit

 

 

 

 

 

 

 

 

 

ICC1

Vcc Operating

VCC = Max., CS = VIL

Com.

60

60

mA

 

Supply Current

IOUT = 0 mA, f = 0

Ind.

70

70

 

 

 

 

 

 

 

 

 

 

ICC2

Vcc Dynamic Operating

VCC = Max., CS = VIL

Com.

70

65

mA

 

Supply Current

IOUT = 0 mA, f = fMAX

Ind.

80

75

 

 

 

 

 

 

 

 

 

 

ISB1

TTL Standby Current

VCC = Max.,

Com.

5

5

mA

 

(TTL Inputs)

VIN = VIH or VIL

Ind.

10

10

 

 

 

CS VIH, f = 0

 

 

 

 

 

 

ISB2

CMOS Standby

VCC = Max.,

Com.

0.5

0.5

mA

 

Current (CMOS Inputs)

CS VCC – 0.2V,

Ind.

1.0

1.0

 

 

 

VIN VCC – 0.2V, or

 

 

 

 

 

 

 

 

VIN 0.2V, f = 0

 

 

 

 

 

 

Note:

1. At f = fMAX, address and data inputs are cycling at the maximum frequency, f = 0 means no input lines change.

CAPACITANCE(1,2)

Symbol

Parameter

Conditions

Max.

Unit

CIN

Input Capacitance

VIN = 0V

8

pF

 

 

 

 

 

COUT

Output Capacitance

VOUT = 0V

10

pF

Notes:

1.Tested initially and after any design or process changes that may affect these parameters.

2.Test conditions: TA = 25°C, f = 1 MHz, Vcc = 5.0V.

Integrated Silicon Solution, Inc. — 1-800-379-4774

3

SR072-1E 05/12/99

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