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CD74ACT161

更新时间： 2024-11-04 23:00:39

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	135K
描述
4-BIT SYNCHRONOUS BINARY COUNTERS

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数据手册
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CD74ACT161 数据手册

CD54ACT161, CD74ACT161

4-BIT SYNCHRONOUS BINARY COUNTERS

SCHS298 – APRIL 2000

CD54ACT161 . . . F PACKAGE

CD74ACT161 . . . E OR M PACKAGE

(TOP VIEW)

Inputs Are TTL-Voltage Compatible

Internal Look-Ahead for Fast Counting

Carry Output for n-Bit Cascading

Synchronous Counting

CLR

CLK

RCO

Synchronously Programmable

SCR-Latchup-Resistant CMOS Process and

Circuit Design

Exceeds 2 kV ESD Protection per

MIL-STD-883, Method 3015

ENP

GND

ENT

LOAD

Package Options Include Plastic

Small-Outline (M) Standard Plastic (E) and

Ceramic (F) DIPs

description

The CD54ACT161 and CD74ACT161 devices are 4-bit binary counters. These synchronous, presettable

counters feature an internal carry look-ahead for application in high-speed counting designs. 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 synchronous (ripple-clock)

counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of the clock

waveform.

These devices are fully programmable; that is, they can be preset to any number between 0 and 9 or 15.

Presetting is synchronous; therefore, setting up a low level at the load input disables the counter and causes

the outputs to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs.

The clear function is asynchronous. A low level at the clear (CLR) input sets all four of the flip-flop outputs low,

regardless of the levels of the CLK, load (LOAD), or enable inputs.

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

additional gating. Instrumental in accomplishing this function are ENP, ENT, and a ripple-carry output (RCO).

Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. Enabling RCO produces a

high-level pulse while the count is maximum (9 or 15 with Q high). This high-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 CLK.

The counters feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD) 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 CD54ACT161 is characterized for operation over the full military temperature range of –55°C to 125°C.

The CD74ACT161 is characterized for operation from –40°C to 85°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...9

中文翻译

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CD74ACT161 替代型号

型号	品牌	替代类型	描述	数据表
CD54ACT161	TI	功能相似	4-BIT SYNCHRONOUS BINARY COUNTERS

与CD74ACT161相关器件

型号	品牌	获取价格	描述	数据表
CD74ACT161E	TI	获取价格	4-BIT SYNCHRONOUS BINARY COUNTERS
CD74ACT161E	ROCHESTER	获取价格	Binary Counter, ACT Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMO
CD74ACT161EE4	TI	获取价格	4-BIT SYNCHRONOUS BINARY COUNTERS
CD74ACT161EN	ETC	获取价格	Logic IC
CD74ACT161EX	GE	获取价格	Binary Counter, ACT Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMO
CD74ACT161F	ETC	获取价格	Logic IC
CD74ACT161M	TI	获取价格	4-BIT SYNCHRONOUS BINARY COUNTERS
CD74ACT161M	RENESAS	获取价格	IC,COUNTER,UP,4-BIT BINARY,ACT-CMOS,SOP,16PIN,PLASTIC
CD74ACT161M	ROCHESTER	获取价格	Binary Counter, ACT Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMO
CD74ACT161M96	TI	获取价格	4-BIT SYNCHRONOUS BINARY COUNTERS

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