MCM72BB32

•MCM72BB64

1

MOTOROLA FAST SRAM

256KB and 512KB BurstRAM

™

Secondary Cache Module for

Pentium

™

The MCM72BB32SG and MCM72BB64SG are designed to provide a burstable,

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 160 pin card edge

memory module. Each 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

controllers with on board tag.

PD0 – PD2 are reserved for density identification.

• Pentium–style Burst Counter on Board

• 160 Pin Card Edge Module

• 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

• 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

• Burndy Connector, Part Number: CELP2X80SC3Z48

BurstRAM is a trademark of Motorola.

Pentium is a trademark of Intel Corp.

160–LEAD

CARD EDGE

CASE 1113–01

TOP VIEW

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SEMICONDUCTOR TECHNICAL DATA

MCM72BB32

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