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PI74FCT193T

High-Speed CMOS Presettable Synchronous 4-Bit Binary Counters

Pericom Semiconductor 

PI74FCT193

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High-Speed CMOS Presettable Synchronous

4-Bit Binary Counters

Product Pin Configurations

Product Pin Description

Pin Name

Description

PL

Asynchronous Preload (Active Low)

D1

Q1

Q0

CPD

CPU

Q2

Q3

GND

1

16

2

15

3

14

16-Pin

4 Q16 13

5 S16 12

6

11

7

10

8

9

VCC

D0

MR

TCD

TCU

PL

D2

D3

MR

CPU

CPD

Dn

Qn

TCU

TCD

Asynchronous Master Reset (Active High)

Count Up Clock (Rising Edge)

Count Down Clock (Rising Edge)

Data Outputs

Data Outputs

Terminal Count Up (Carry) Output (Active Low)

Terminal Count Down (Borrow) Output (Active Low)

Truth Table(1)

Inputs

PL

MR

CPU

CPD

X

H

X

L

X

H

X

H

L

L

X

X

H

L

↑

H

H

L

Η

↑

H

L

L

H

H

L

H

H

H

L

H

L

H

L

H

H

Notes:

1. H = High Voltage Level

L = Low Voltage Level

X = Irrelevant

↑ = Clock Transition, Low-to-High

DI

X

X

D3-D0

X

X

X

X

X

X

Outputs

Q3-Q0 TCU

0000

X

0000

X

D3-D0

X

Q+1

X

Q–1

X

F

L

0-E

H

0

H

1-F

H

TCD

L

H

X

X

X

H

H

L

H

Function

Reset

Reset

Load Data

Count Up

Count Down

Count Up = 1111

Count Up ≠ 1111

Count Down = 0000

Count Down ≠ 0000

2

PS2085E 09/14/99

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