1

TM

File Number

3039.2

HS-81C55RH, HS-81C56RH

Radiation Hardened 256 x 8 CMOS RAM

The HS-81C55/56RH are radiation hardened RAM and I/O

chips fabricated using the Intersil radiation hardened Self-

Aligned Junction Isolated (SAJI) silicon gate technology.

Latch-up free operation is achieved by the use of epitaxial

starting material to eliminate the parasitic SCR effect seen in

conventional bulk CMOS devices.

The HS-81C55/56RH is intended for use with the

HS-80C85RH radiation hardened microprocessor system.

The RAM portion is designed as 2048 static cells organized

as 256 x 8. A maximum post irradiation access time of

500ns allows the HS-81C55/56RH to be used with the

HS-80C85RH CPU without any wait states. The

HS-81C55RH requires an active low chip enable while the

HS-81C56RH requires an active high chip enable. These

chips are designed for operation utilizing a single 5V power

supply.

Specifications for Rad Hard QML devices are controlled

by the Defense Supply Center in Columbus (DSCC). The

SMD numbers listed here must be used when ordering.

Detailed Electrical Specifications for these devices are

contained in SMD 5962-96766. A “hot-link” is provided

on our homepage for downloading.

http://www.intersil.com/spacedefense/space.asp

Features

• Electrically Screened to SMD # 5962-96766

• QML Qualified per MIL-PRF-38535 Requirements

• Radiation Hardened EPI-CMOS

- Total Dose . . . . . . . . . . . . . . . . . . . . . 100 krad(Si) (Max)

• Electrically Equivalent to Sandia SA 3001

• Pin Compatible with Intel 8155/56

• Bus Compatible with HS-80C85RH

• Single 5V Power Supply

• Low Standby Current . . . . . . . . . . . . . . . . . . . .200

µA Max

• Low Operating Current . . . . . . . . . . . . . . . . . . . . 2mA/MHz

• Completely Static Design

• Internal Address Latches

• Two Programmable 8-Bit I/O Ports

• One Programmable 6-Bit I/O Port

• Programmable 14-Bit Binary Counter/Timer

• Multiplexed Address and Data Bus

• Self Aligned Junction Isolated (SAJI) Process

Functional Diagram

Ordering Information

ORDERING NUMBER

INTERNAL

MKT. NUMBER

TEMP. RANGE

5962R9676601QXC

HS1-81C55RH-8

-55 to 125

5962R9676601QYC

HS9-81C55RH-8

-55 to 125

5962R9676601VXC

HS1-81C55RH-Q

-55 to 125

5962R9676601VYC

HS9-81C55RH-Q

-55 to 125

5962R9676602QXC

HS1-81C56RH-8

-55 to 125

5962R9676602QYC

HS9-81C56RH-8

-55 to 125

5962R9676602VXC

HS1-81C56RH-Q

-55 to 125

5962R9676602VYC

HS9-81C56RH-Q

-55 to 125

256 x 8

STATIC

RAM

A

B

C

TIMER

IO/M

AD0 - AD7

CE OR CE

†

ALE

RD

WR

RESET

TIMER CLK

TIMER OUT

8

PA0 - PA7

PORT A

8

PB0 - PB7

PORT B

8

PC0 - PC5

PORT C

VDD (10V)

GND

81C56RH = CE

Data Sheet

August 2000

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143