P4C174-12JC Просмотр технического описания (PDF) - Performance Semiconductor

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P4C174-12JC

HIGH SPEED 8K x 8 CACHE TAG STATIC RAM

Performance Semiconductor 

P4C174

P4C174

HIGH SPEED 8K x 8

CACHE TAG STATIC RAM

FEATURES

High Speed Address-To-Match - 8 ns Maximum

Access Time

High-Speed Read-Access Time

– 8/10/12/15/20/25 ns (Commercial)

Open Drain MATCH Output

Reset Function

8-Bit Tag Comparison Logic

Automatic Powerdown During Long Cycles

Data Retention at 2V for Battery Backup Operation

Advanced CMOS Technology

Low Power Operation

— Active: 750 mW Typical at 25 ns

— Standby: 500 µW Typical

Package Styles Available

— 28 Pin 300 mil Plastic DIP

— 28 Pin 300 mil Plastic SOJ

Single Power Supply

— 5V±10%

DESCRIPTION

The P4C174 is a 65,536 bit high speed cache tag static

RAM organized as 8K x 8. The CMOS memory has equal

access and cycle times. Inputs are fully TTL-compatible.

The cache tag RAMs operate from a single 5V±10%

power supply. An 8-bit data comparator with a MATCH

output is included for use as an address tag comparator in

high speed cache applications. The reset function pro-

vides the capability to reset all memory locations to a LOW

level.

The MATCH output of the P4C174 reflects the compari-

son result between the 8-bit data on the I/O pins and

the addressed memory location. 8K Cache lines can be

mapped into 1M-Byte address spaces by comparing 20

address bits organized as 13-line address bits and 7-page

address bits.

Low power operation of the P4C174 is enhanced by

automatic powerdown when the memory is deselected or

during long cycle times. Also, data retention is maintained

down to VCC = 2.0. Typical battery backup applications

consume only 30 µW at VCC = 3.0V.

FUNCTIONAL BLOCK DIAGRAM

ROW

8

ADDRESS

ROW

SELECT

256 x 32 x 8

MEMORY

ARRAY

RESET

8

8

DATA 8 COMPARATOR 1 (IF MATCH)

I/O

8

WE

OE

CE

COLUMN SELECT

& COLUMN

SENSE

8

5

COLUMN

ADDRESS

MATCH (OPEN DRAIN)

174.1

PIN CONFIGURATION

RESET 1

A12 2

A7 3

A6 4

A5 5

A4 6

A3 7

A2 8

A1 9

A0 10

I/00 11

I/01 12

I/02 13

GND 14

28 Vcc

27 WE

26 MATCH

25 A8

24 A9

23 A11

22 OE

21 A10

20 CE

19 I/07

18 I/06

17 I/05

16 I/04

15 I/03

DIP (P5), SOJ (J5)

TOP VIEW

Means Quality, Service and Speed

1Q97

99

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