DM7556

更新时间： 2024-11-20 22:40:35

品牌	Logo	应用领域
美国国家半导体 - NSC		计数器
页数	文件大小	规格书
8页	149K
描述
TRI-STATE? Programmable Binary Counters

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DM7556 数据手册

August 1989

DM7556/DM8556 TRI-STATE Programmable

Binary Counters

General Description

Features

Typical clock frequency 35 MHz

These circuits are synchronous, edge-sensitive, fully-pro-

grammable 4-bit counters. The counters feature both con-

ventional totem-pole and TRI-STATE outputs; such that

when the outputs are in the high impedance mode, they can

be used to enter data from the bus lines. In addition, the

clear input operates completely independent of all other in-

puts. During the programming operation, data is loaded into

the flip-flops on the positive-going edge of the clock pulse.

To facilitate cascading of these counters, the MAX COUNT

output can be tied directly into the count enable input of the

next counter.

TRI-STATE outputs

Fully independent clear

Synchronous loading

Cascading circuitry provided internally

Connection Diagram

Dual-In-Line Package

TL/F/6588–1

Order Number DM7556J or DM8556N

See NS Package Number J16A or N16A

Function Table

Control Inputs

LOAD CE CLK OD Reset I/O

I/O Ports

Active Outputs

I/O

COUNT

The I/O pins are used as inputs when they are TRI-STATED, and the LOAD input is Low. They are outputs and active

when LOAD input is High and OD is Low.

High Level (Steady State)

Low Level (Steady State)

Don’t Care including transitions

a, b, c, d

The level of the steady state input at inputs A, B, C, D respectively

The level of Q , Q , Q , Q respectively, before the indicated steady state input conditions

A B C D

, Q , Q , Q

B0 C0 D0

were established.

TRI-STATEÉ is a registered trademark of the National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/6588

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7 8

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与DM7556相关器件

型号	品牌	获取价格	描述	数据表
DM7556J	NSC	获取价格	TRI-STATE? Programmable Binary Counters
DM7556J	ROCHESTER	获取价格	Binary Counter, 75 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL,
DM7556J	TI	获取价格	75 SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, CDIP16, CERAMIC, DIP-16
DM7556J/883	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,TTL,DIP,16PIN,CERAMIC
DM7556J/883B	TI	获取价格	75 SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, CDIP16, CERAMIC, DIP-16
DM7556J/883C	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,TTL,DIP,16PIN,CERAMIC
DM7556J/883C	ROCHESTER	获取价格	Binary Counter,
DM7556J/B	ROCHESTER	获取价格	Binary Counter,
DM7556J-MIL	NSC	获取价格	IC,COUNTER,UP,4-BIT BINARY,TTL,DIP,16PIN,CERAMIC
DM7556J-MIL	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,TTL,DIP,16PIN,CERAMIC