SN74F169

更新时间： 2024-09-15 22:53:35

品牌	Logo	应用领域
德州仪器 - TI		计数器
页数	文件大小	规格书
9页	128K
描述
SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER

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SN74F169 数据手册

SN74F169

SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER

SDFS089 – MARCH 1987 – REVISED OCTOBER 1993

D OR N PACKAGE

• Fully Synchronous Operation for Counting

(TOP VIEW)

and Programming

• Internal Look-Ahead Circuitry for Fast

RCO

U/D

CLK

Counting

• Carry Output for N-Bit Cascading

• Fully Independent Clock Circuit

• Package Options Include Plastic

Small-Outline Packages and Standard

Plastic 300-mil DIPs

ENT

ENP

GND

LOAD

description

This synchronous, presettable, 4-bit up/down binary counter features an internal carry look-ahead circuitry for

cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops

clocked simultaneously so that the outputs change coincident with each other when so instructed by the

count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output counting

spikes that are normally associated with asynchronous (ripple-clock) counters. A buffered clock (CLK) input

triggers the four flip-flops on the rising (positive-going) edge of the clock waveform.

This counter is fully programmable; that is, it may be preset to any number between 0 and its maximum count.

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 (LOAD) input disables the counter and causes the outputs to

agree with the data inputs after the next clock pulse.

The carry look-ahead circuitry provides for cascading counters for n-bit synchronous application without

additional gating. Instrumental in accomplishing this function are two count-enable (ENP, ENT) inputs and a

ripple-carry (RCO) output. Both ENP and ENT must be low to count. The direction of the count is determined

by the level of the up/down (U/D) input. When U/D is high, the counter counts up; when low, it counts down. Input

ENT is fed forward to enable the RCO. RCO thus enabled will produce a low-level pulse while the count is zero

(all inputs low) counting down or maximum (9 or 15) counting up. This low-level overflow ripple-carry pulse can

be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed regardless of the level

of the clock input. All inputs are diode clamped to minimize transmission-line effects, thereby simplifying system

design.

The SN74F169 features a fully independent clock circuit. Changes at control inputs (ENP, ENT, LOAD or U/D)

that will modify the operating mode have no effect on the contents of the counter until clocking occurs. The

function of the counter (whether enabled, disabled, loading, or counting) will be dictated solely by the conditions

meeting the setup and hold times.

The SN74F169 is characterized for operation from 0°C to 70°C.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

2–1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...9

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与SN74F169相关器件

型号	品牌	获取价格	描述	数据表
SN74F169D	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTER
SN74F169D-00	TI	获取价格	F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16
SN74F169D-00R	TI	获取价格	F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16
SN74F169D3	ROCHESTER	获取价格	Binary Counter,
SN74F169D3	TI	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,F-TTL,SOP,16PIN,PLASTIC
SN74F169DE4	ROCHESTER	获取价格	Binary Counter, F/FAST Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional,
SN74F169DG4	TI	获取价格	F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GRE
SN74F169DG4	ROCHESTER	获取价格	Binary Counter, F/FAST Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional,
SN74F169DR	TI	获取价格	F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, PLA
SN74F169DRE4	TI	获取价格	F/FAST SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, PLA

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