PI74FCT191T Просмотр технического описания (PDF) - Pericom Semiconductor

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PI74FCT191T

High Speed CMOS Presettable Synchronous 4-Bit Binary Counters

Pericom Semiconductor 

PI74FCT191T

(25Ω SERIES) PI74FCT2191T

4-BIT BINARY COUNTERS 1122334455667788990011223344556677889900112233445566778899001122112233445566778899001122334455667788990011223344556677889900112211223344556677889900112233445566778899001122334455667788990011221122334455667788990011223344556677889900112233445566778899001122112233445566778899001122

Product Pin Configurations

(All Pins Top View)

D1

Q1

Q0

CE

U/D

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

CP

RC

TC

PL

D2

D3

Product Pin Description

Pin Name

I/O

D3-D0

I

Q3-Q0

O

PL

I

U/D

I

CE

I

CP

I

TC

O

RC

O

Description

Data Inputs

Data Outputs

Preload

Up/Down Select

Count Enable

Count Clock

Terminal Count

Ripple Clock

Truth Table(1)

Inputs

PL

U/D

CP

L

X

X

H

L

↑

H

H

↑

H

X

X

H

L

Η

H

L

H

L

X

H

H

H

H

H

H

H

X

Notes:

1. H = High Voltage Level

L = Low Voltage Level

X = Don’t Care

Z = High Impedance

Outputs

CE

DI

Q3-Q0

TC

RC

X

D3-D0 D3-D0

X

X

L

X

Q+1

L

H

L

X

Q-1

L

H

H

X

Q

X

X

L

X

F

H

H

L

X

F

H

X

X

0-E

L

H

L

X

0

H

H

L

X

0

H

X

X

1-F

L

H

Function

Load Data

Count Up

Count Down

Count Inhibit

Count Up = 1111

Count Up = 1111

Count Up ≠ 1111

Count Down = 0000

Count Down = 0000

Count Down ≠ 0000

2

PS2084B 01/13/97

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