Datasheet > MCM67H618A

MCM67H618A

更新时间： 2024-09-17 22:19:55

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		/
页数	文件大小	规格书
12页	212K
描述
64K x 18 Bit BurstRAM Synchronous Fast Static RAM

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MCM67H618A 数据手册

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SEMICONDUCTOR TECHNICAL DATA

MCM67H618A

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64K x 18 Bit BurstRAM

Synchronous Fast Static RAM

With Burst Counter and Self–Timed Write

The MCM67H618A is a 1,179,648 bit synchronous fast static random access

memory designed to provide a burstable, high–performance, secondary cache

for the i486 and Pentium microprocessors. It is organized as 65,536 words

of 18 bits, fabricated with Motorola’s high–performance silicon–gate BiCMOS

technology. The device integrates input registers, a 2–bit counter, high speed

SRAM, and high drive capability outputs onto a single monolithic circuit for

reduced parts count implementation of cache data RAM applications. Syn-

chronous design allows precise cycle control with the use of an external clock

(K). BiCMOS circuitry reduces the overall power consumption of the integrated

functions for greater reliability.

FN PACKAGE

PLASTIC

CASE 778–02

PIN ASSIGNMENT

1 52 51 50 49 48 47

Addresses (A0 – A15), data inputs (D0 – D17), and all control signals except

output enable (G) are clock (K) controlled through positive–edge–triggered

noninverting registers.

DQ9

DQ10

DQ8

DQ7

DQ6

Bursts canbeinitiatedwitheitheraddressstatusprocessor(ADSP) or address

status cache controller (ADSC) input pins. Subsequent burst addresses can be

generated internally by the MCM67H618A (burst sequence imitates that of the

i486 and Pentium) and controlled by the burst address advance (ADV) input pin.

The following pages provide more detailed information on burst controls.

Write cycles are internally self–timed and are initiated by the rising edge of the

clock (K) input. This feature eliminates complex off–chip write pulse generation

and provides increased flexibility for incoming signals.

DQ11

DQ12

DQ13

DQ14

DQ5

40 DQ4

39 DQ3

38 DQ2

DQ15

Dual write enables (LW and UW) are provided to allow individually writeable DQ16 19

35 DQ1

34 DQ0

DQ17

bytes. LW controls DQ0 – DQ8 (the lower bits), while UW controls DQ9 – DQ17

(the upper bits).

21 22 23 24 25 26 27 28 29 30 31 32 33

This device is ideally suited for systems that require wide data bus widths and

cache memory. See Figure 2 for applications information.

•

Single 5 V ± 5% Power Supply

Fast Access Times: 9/10/12 ns Max

Byte Writeable via Dual Write Enables

Internal Input Registers (Address, Data, Control)

Internally Self–Timed Write Cycle

ADSP, ADSC, and ADV Burst Control Pins

Asynchronous Output Enable Controlled Three–State Outputs

Common Data Inputs and Data Outputs

3.3 V I/O Compatible

High Board Density 52–Lead PLCC Package

ADSP Disabled with Chip Enable (E) – Supports Address Pipelining

PIN NAMES

A0 – A15 . . . . . . . . . . . . . . . . Address Inputs

K . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clock

ADV . . . . . . . . . . . . Burst Address Advance

LW . . . . . . . . . . . . Lower Byte Write Enable

UW . . . . . . . . . . . . Upper Byte Write Enable

ADSC . . . . . . . . . Controller Address Status

ADSP . . . . . . . . . Processor Address Status

E . . . . . . . . . . . . . . . . . . . . . . . . . Chip Enable

G . . . . . . . . . . . . . . . . . . . . . . Output Enable

DQ0 – DQ17 . . . . . . . . . . Data Input/Output

. . . . . . . . . . . . . . . . + 5 V Power Supply

. . . . . . . . . . . . . . . . . . . . . . . . . . Ground

All power supply and ground pins must be

connectedforproperoperationofthedevice.

BurstRAM is a trademark of Motorola, Inc.

i486 and Pentium are trademarks of Intel Corp.

This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.

REV 1

5/95

Motorola, Inc. 1994

MOTOROLA FAST SRAM

MCM67H618A

12 3 4 5 6 7...12

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与MCM67H618A相关器件

型号	品牌	获取价格	描述	数据表
MCM67H618AFN10	MOTOROLA	获取价格	64K x 18 Bit BurstRAM Synchronous Fast Static RAM
MCM67H618AFN12	MOTOROLA	获取价格	64K x 18 Bit BurstRAM Synchronous Fast Static RAM
MCM67H618AFN8.5	MOTOROLA	获取价格	64KX18 CACHE SRAM, 8.5ns, PQCC52, PLASTIC, LCC-52
MCM67H618AFN9	MOTOROLA	获取价格	64K x 18 Bit BurstRAM Synchronous Fast Static RAM
MCM67H618B	MOTOROLA	获取价格	64K x 18 Bit BurstRAM Synchronous Fast Static RAM
MCM67H618BFN10	MOTOROLA	获取价格	64K x 18 Bit BurstRAM Synchronous Fast Static RAM
MCM67H618BFN10R	MOTOROLA	获取价格	Cache SRAM, 64KX18, 10ns, BICMOS, PQCC52, PLASTIC, LCC-52
MCM67H618BFN12	MOTOROLA	获取价格	64K x 18 Bit BurstRAM Synchronous Fast Static RAM
MCM67H618BFN12R	MOTOROLA	获取价格	64KX18 CACHE SRAM, 12ns, PQCC52, PLASTIC, LCC-52
MCM67H618BFN9	MOTOROLA	获取价格	64K x 18 Bit BurstRAM Synchronous Fast Static RAM

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