Datasheet > 54LS169LMQB

54LS169LMQB

更新时间： 2024-11-08 22:26:07

品牌	Logo	应用领域
美国国家半导体 - NSC		计数器触发器逻辑集成电路
页数	文件大小	规格书
8页	168K
描述
Synchronous 4-Bit Up/Down Binary Counter

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

54LS169LMQB 数据手册

June 1989

54LS169/DM54LS169A/DM74LS169A

Synchronous 4-Bit Up/Down Binary Counter

General Description

This synchronous presettable counter features an internal

carry look-ahead for cascading in high-speed counting ap-

plications. Synchronous operation is provided by having all

flip-flops clocked simultaneously, so that the outputs all

change at the same time when so instructed by the count-

enable inputs and internal gating. This mode of operation

helps eliminate the output counting spikes that are normally

associated with asynchronous (ripple clock) counters. A

buffered clock input triggers the four master-slave flip-flops

on the rising edge of the clock waveform.

counting up, and approximately equal to the low portion of

the Q output when counting down. This low-level overflow

carry pulse can be used to enable successively cascaded

stages. Transitions at the enable P or T inputs are allowed

regardless of the level of the clock input. All inputs are diode

clamped to minimize transmission-line effects, thereby sim-

plifying system design.

This counter features

a fully independent clock circuit.

Changes at control inputs (enable P, enable T, load, up/

down), which modify the operating mode, have no effect

until clocking occurs. The function of the counter (whether

enabled, disabled, loading, or counting) will be dictated

solely by the conditions meeting the stable setup and hold

times.

This counter is fully programmable; that is, the outputs may

each be preset either high or low. The load input circuitry

allows loading with the carry-enable output of cascaded

counters. As loading is synchronous, setting up a low level

at the load input disables the counter and causes the out-

puts to agree with the data inputs after the next clock pulse.

Features

The carry look-ahead circuitry permits cascading counters

for n-bit synchronous applications without additional gating.

Both count-enable inputs (P and T) must be low to count.

The direction of the count is determined by the level of the

up/down input. When the input is high, the counter counts

up; when low, it counts down. Input T is fed forward to en-

able the carry outputs. The carry output thus enabled will

produce a low-level output pulse with a duration approxi-

Fully synchronous operation for counting and

programming.

Internal look-ahead for fast counting.

Carry output for n-bit cascading.

Fully independent clock circuit

Alternate Military/Aerospace device (54LS169) is

a National Semiconductor Sales

available. Contact

Office/Distributor for specifications.

mately equal to the high portion of the Q output when

Connection Diagram

Dual-In-Line Package

TL/F/6401–1

Order Number 54LS169DMQB, 54LS169FMQB, 54LS169LMQB,

DM54LS169AJ, DM54LS169AW, DM74LS169AM or DM74LS169AN

See NS Package Number E20A, J16A, M16A, N16E or W16A

1995 National Semiconductor Corporation

TL/F/6401

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

12 3 4 5 6 7 8

中文翻译

下载PDF

与54LS169LMQB相关器件

型号	品牌	获取价格	描述	数据表
54LS169M/B2AJC	MOTOROLA	获取价格	LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, CQCC20, CERAMIC
54LS170	NSC	获取价格	4x4 REGISTER FILE WITH OPEN-COLLECTOR OUTPUTS
54LS170/BFBJC	MOTOROLA	获取价格	Memory IC, TTL, CDFP16
54LS170DM	ETC	获取价格	4 X 4 REGISTER FILE (With Open-Collector Output)
54LS170DMQB	NSC	获取价格	4x4 REGISTER FILE WITH OPEN-COLLECTOR OUTPUTS
54LS170F	NXP	获取价格	IC 4 X 4 STANDARD SRAM, 40 ns, CDIP16, Static RAM
54LS170FM	ETC	获取价格	4 X 4 REGISTER FILE (With Open-Collector Output)
54LS170FMQB	NSC	获取价格	4x4 REGISTER FILE WITH OPEN-COLLECTOR OUTPUTS
54LS170M/B2CJC	MOTOROLA	获取价格	Memory IC, TTL, CQCC20
54LS170W	NXP	获取价格	4X4 STANDARD SRAM, 40ns, CDFP16

与54LS169LMQB相关文章

英伟达新AI芯片Rubin或提前半年亮相
2024-11-05

22
苹果iPhone 17将全系采用三星/LG显示LTPO OLED面板
2024-11-05

21
三星深化印度制造布局，供应链本地化进程加速
2024-10-29

47
芯擎科技“星辰一号”自动驾驶芯片点亮成功，2025年量产在即
2024-10-29

39

产品中心

服务支持

精选活动

关于我们

帮助中心

54LS169LMQB

54LS169LMQB 数据手册

与54LS169LMQB相关器件

与54LS169LMQB相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

54LS169LMQB

54LS169LMQB 数据手册

与54LS169LMQB相关器件

与54LS169LMQB相关文章

您还可以找

您在本页遇到什么问题？