FN2250 Rev 2.00

Page 1 of 10

September 1995

FN2250

Rev 2.00

September 1995

HCTS191MS

Radiation Hardened Synchronous 4-Bit Up/Down Counter

DATASHEET

Features

• 3 Micron Radiation Hardened CMOS SOS

• Total Dose 200K RAD (Si)

• SEP Effective LET No Upsets: >100 MEV-cm2/mg

• Single Event Upset (SEU) Immunity < 2 x 10-9 Errors/

Bit-Day (Typ)

• Dose Rate Survivability: >1 x 1012 RAD (Si)/s

• Dose Rate Upset: >1010 RAD (Si)/s 20ns Pulse

• Cosmic Ray Upset Immunity 2 x 10-9 Errors/Bit Day

• Latch-Up Free Under Any Conditions

• Fanout (Over Temperature Range)

- Standard Outputs - 10 LSTTL Loads

• Military Temperature Range: -55oC to +125oC

• Significant Power Reduction Compared to LSTTL ICs

• DC Operating Voltage Range: 4.5V to 5.5V

• LSTTL Input Compatibility

- VIL = 0.8V Max

- VIH = VCC/2 Min

• Input Current Levels Ii

 5A @ VOL, VOH

Description

The Intersil HCTS191MS is a Radiation Hardened asynchro-

nously presettable 4 bit binary up/down synchronous

counter. Presetting the counter to the number on the preset

data inputs (P0 - P3) is accomplished by a low asynchro-

nous parallel load input (PL). Counting occurs when PL is

high, Count Enable (CE) is low, and the Up/Down (U/D) input

is either low for up-counting or high for down-counting. The

counter is incremented or decremented synchronously with

the low-to-high transition of the clock.

When an overflow or underflow of the counter occurs, the

Terminal Count output (TC), which is low during counting,

goes high and remains high for one clock cycle. This output

can be used for look-ahead carry in high speed cascading.

The TC output also initiates the Ripple Clock output (RC)

which, normally high, goes low and remains low for the low-

level portion of the clock pulse. These counter can be cas-

caded using the Ripple Carry output.

The HCTS191MS utilizes advanced CMOS/SOS technology

to achieve high-speed operation. This device is a member of

radiation hardened, high-speed, CMOS/SOS Logic Family.

The HCTS191MS is supplied in a 16 lead Ceramic

flatpack (K suffix) or a SBDIP Package (D suffix).

Pinouts

16 LEAD CERAMIC DUAL-IN-LINE METAL SEAL PACKAGE

(SBDIP) MIL-STD-1835 CDIP2-T16

TOP VIEW

16 LEAD CERAMIC METAL SEAL FLATPACK PACKAGE

(FLATPACK) MIL-STD-1835 CDFP4-F16

TOP VIEW

TRUTH TABLE

FUNCTION

PL

CE

U/D

CP

Count Up

H

L

L

Count Down

H

L

H

Asynchronous Preset

L

X

X

X

No Change

H

H

X

X

H = High Level, L = Low Level, X = Immaterial

= Transition from low to high

NOTE: U/D or CE should be changed only when CLOCK (CP)

is high.

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

Q1

Q0

CE

U/D

Q2

GND

Q3

CP

RC

TC

PL

P2

P0

P1

VCC

P3

2

3

4

5

6

7

8

116

15

14

13

12

11

10

9

Q1

Q0

CE

U/D

Q2

GND

Q3

P1

CP

RC

TC

PL

P2

P0

VCC

P3

Ordering Information

PART NUMBER

TEMPERATURE RANGE

SCREENING LEVEL

PACKAGE

HCTS191DMSR

-55oC to +125oC

Intersil Class S Equivalent

16 Lead SBDIP

HCTS191KMSR

-55oC to +125oC

Intersil Class S Equivalent

16 Lead Ceramic Flatpack

HCTS191D/Sample

+25oC

Sample

16 Lead SBDIP

HCTS191K/Sample

+25oC

Sample

16 Lead Ceramic Flatpack

HCTS191HMSR

+25oCDie

Die