MCM72BA32

•MCM72BA64

1

MOTOROLA FAST SRAM

256KB and 512KB BurstRAM

™

Secondary Cache Module for

Pentium

™

The MCM72BA32SG and MCM72BA64SG are designed to provide a burst-

able, high performance, 256K/512K L2 cache for the Pentium microprocessor.

The modules are configured as 32K x 72 and 64K x 72 bits in a 136 pin dual read-

out single inline memory module (DIMM). The module uses four of Motorola’s

MCM67B518 or MCM67B618 BiCMOS BurstRAMs.

Bursts can be initiated with either address status processor (ADSP) or address

status controller (ADSC). Subsequent burst addresses are generated internal to

the BurstRAM by the burst advance (ADV) input pin.

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

clock (K) input. Eight write enables are provided for byte write control.

The cache family is designed to interface with popular Pentium cache control-

lers with on board TAG.

PD0 – PD2 are reserved for density and speed identification.

• Pentium–style Burst Counter on Board

• Dual Readout SIMM for Circuit Density

• Single 5 V ± 5% Power Supply

• All Inputs and Outputs are TTL Compatible

• Three State Outputs

• Byte Parity

• Byte Write Capability

• Fast Module Clock Rates: 66 MHz, 60 MHz, 50MHz

• Decoupling Capacitors for each Fast Static RAM

• High Quality Multi–Layer FR4 PWB With Separate Power and Ground Planes

• I/Os are 3.3 V Compatible

BurstRAM is a trademark of Motorola.

Pentium is a trademark of Intel Corp.

Order this document

by MCM72BA32/D

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

MCM72BA32

MCM72BA64

68

35

34

1

136–LEAD DIMM

CASE 1104–01

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