M54HC192 查看數據表（PDF） - STMicroelectronics

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M54HC192

HC193 - SYNCHRONOUS UP/DOWN BINARY COUNTER HC192 - SYNCHRONOUS UP/DOWN DECADE COUNTER

STMicroelectronics 

M54/M74HC192/193

INPUT AND OUTPUT EQUIVALENT CIRCUIT

IEC LOGIC SYMBOL (HC191)

PIN DESCRIPTION

PIN No

3, 2, 6, 7

4

5

11

12

13

14

15, 1, 10, 9

8

16

SYMBOL

QA to QD

CPD

CPU

LOAD

CARRY

BORROW

CLEAR

DA to DD

GND

VCC

NAME AND FUNCTION

Flip-Flop Outputs

Count Down Clock Input

Count Up Clock Input

Asynchronous Parallel

Load Input (Active LOW)

Count Up (Carry)

Output (Active LOW)

Count Down (Borrow)

Output (Active LOW)

Asynchronous Reset

Input (Active HIGH)

Data Inputs

Ground (0V)

Positive Supply Voltage

IEC LOGIC SYMBOL (HC193)

TRUTH TABLE

COUNT UP

H

H

X

X

X: Don’t Care

COUNT DOWN

H

H

X

X

LOAD

H

H

H

H

L

X

CLEAR

L

L

L

L

L

H

FUNCTION

COUNT UP

NO COUNT

COUNT DOWN

NO COUNT

PRESET

RESET

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