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SN74ALS193A

更新时间： 2024-11-26 23:06:15

品牌	Logo	应用领域
德州仪器 - TI		计数器时钟
页数	文件大小	规格书
8页	132K
描述
SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS WITH DUAL CLOCK AND CLEAR

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SN74ALS193A 数据手册

SN54ALS193A, SN74ALS193A

SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS

WITH DUAL CLOCK AND CLEAR

SDAS211C – DECEMBER 1982 – REVISED JULY 1996

SN54ALS193A . . . J PACKAGE

SN74ALS193A . . . D OR N PACKAGE

(TOP VIEW)

Look-Ahead Circuitry Enhances Cascaded

Counters

Fully Synchronous in Count Modes

Parallel Asynchronous Load for Modulo-N

Count Lengths

CLR

LOAD

Asynchronous Clear

DOWN

Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

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

Ceramic (J) 300-mil DIPs

GND

description

SN54ALS193A . . . FK PACKAGE

(TOP VIEW)

The ’ALS193A are synchronous, reversible, 4-bit

up/down binary counters. Synchronous counting

operation is provided by having all flip-flops

clocked simultaneously so that the outputs

change coincident with each other when

instructed by the steering logic. This mode of

operation eliminates the output counting spikes

normally associated with asynchronous (ripple-

clock) counters.

20 19

CLR

DOWN

LOAD

9 10 11 12 13

The outputs of the four flip-flops are triggered on

a low-to-high-level transition of either count/clock

(UP or DOWN) input. The direction of the count is

determined by which count input is pulsed while

the other count input is high.

NC – No internal connection

All four counters are fully programmable; that is, each output may be preset to either level by placing a low on

the load (LOAD) input and entering the desired data at the data inputs. The output changes to agree with the

data inputs independently of the count pulses. This feature allows the counters to be used as modulo-N dividers

by simply modifying the count length with the preset inputs.

A high level applied to the clear (CLR) input forces all outputs to the low level. The clear function is independent

of the count and LOAD inputs. The UP, DOWN, and LOAD inputs are buffered to lower the drive requirement,

which significantly reduces the loading on, or current required by, clock drivers, etc., for long parallel words.

These counters are designed to be cascaded without the need for external circuitry. The borrow (BO) output

produces a low-level pulse while the count is zero (all Q outputs low) and the DOWN input is low. Similarily, the

carry (CO) output produces a low-level pulse while the count is 9 or 15 (all Q outputs high) and the UP input

is low. The counters can then be easily cascaded by feeding BO and CO to the count-down and count-up inputs,

respectively, of the succeeding counter.

The SN54ALS193A is characterized for operation over the full military temperature range of –55°C to 125°C.

The SN74ALS193A is characterized for operation from 0°C to 70°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7 8

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SN74ALS193A 替代型号

型号	品牌	替代类型	描述	数据表
SN54ALS193A	TI	功能相似	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS WITH DUAL CLOCK AND CLEAR

与SN74ALS193A相关器件

型号	品牌	获取价格	描述	数据表
SN74ALS193AD	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS WITH DUAL CLOCK AND CLEAR
SN74ALS193ADE4	TI	获取价格	ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN,
SN74ALS193ADR	TI	获取价格	4-Bit Synchronous Up/Down Binary Counters With Dual Clock and Clear 16-SOIC 0 to 70
SN74ALS193ADRG4	TI	获取价格	4-Bit Synchronous Up/Down Binary Counters With Dual Clock and Clear 16-SOIC 0 to 70
SN74ALS193AN	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS WITH DUAL CLOCK AND CLEAR
SN74ALS193ANSR	TI	获取价格	ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN,
SN74ALS193ANSRG4	TI	获取价格	ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDSO16, GREEN,
SN74ALS193N	TI	获取价格	ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, PDIP16
SN74ALS20A	TI	获取价格	DUAL 4-INPUT POSITIVE-NAND GATES
SN74ALS20AD	TI	获取价格	DUAL 4-INPUT POSITIVE-NAND GATES

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