Datasheet > SN74AS169A

SN74AS169A

更新时间： 2024-11-13 23:03:11

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	150K
描述
SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS

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SN74AS169A 数据手册

SN54ALS169B, SN54AS169A, SN74ALS169B, SN74AS169A

SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS

SDAS125B – MARCH 1984 – REVISED DECEMBER 1994

SN54ALS169B, SN54AS169A . . . J PACKAGE

SN74ALS169B, SN74AS169A . . . D OR N PACKAGE

(TOP VIEW)

• Fully Synchronous Operation for Counting

and Programming

• Internal Carry Look-Ahead Circuitry for

Fast Counting

U/D

CLK

RCO

• Carry Output for n-Bit Cascading

• Fully Independent Clock Circuit

• Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

Carriers (FK), and Standard Plastic (N) and

Ceramic (J) 300-mil DIPs

ENT

ENP

GND

LOAD

description

SN54ALS169B, SN54AS169A . . . FK PACKAGE

(TOP VIEW)

These synchronous 4-bit up/down binary

presettable counters feature 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 normally associated with

asynchronous (ripple-clock) counters. A buffered

clock (CLK) input triggers the four flip-flops on the

rising(positive-going)edgeoftheclockwaveform.

20 19

9 10 11 12 13

These counters are fully programmable; that is,

they may be preset to either level. The load-input

circuitry allows loading with the carry-enable

output of cascaded counters. Because 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.

NC – No internal connection

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

additional gating. ENP and ENT inputs and a ripple-carry output (RCO) are instrumental in accomplishing this

function. 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. ENT is fed forward

to enable RCO. RCO, thus enabled, produces a low-level pulse while the count is zero (all inputs low) counting

down or maximum (15) counting up. This low-level overflow ripple-carry pulse can be used to enablesuccessive

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.

These counters feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, LOAD, or U/D)

that 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) is dictated solely by the conditions meeting the

stable setup and hold times.

The SN54ALS169B and SN54AS169A are characterized for operation over the full military temperature range

of –55°C to 125°C. The SN74ALS169B and SN74AS169A are 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SN74AS169A相关器件

型号	品牌	获取价格	描述	数据表
SN74AS169AD	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS
SN74AS169ADE4	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS
SN74AS169ADG4	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS
SN74AS169ADR	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS
SN74AS169ADRE4	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS
SN74AS169ADRG4	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS
SN74AS169AFN	ROCHESTER	获取价格	Binary Counter,
SN74AS169AN	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS
SN74AS169AN3	TI	获取价格	IC,COUNTER,UP/DOWN,4-BIT BINARY,AS-TTL,DIP,16PIN,PLASTIC
SN74AS169ANE4	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS

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