Datasheet > CD54AC163_14

CD54AC163_14

更新时间： 2024-11-25 02:58:43

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
12页	158K
描述
4-BIT SYNCHRONOUS BINARY COUNTERS

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CD54AC163_14 数据手册

CD54AC163, CD74AC163

4-BIT SYNCHRONOUS BINARY COUNTERS

SCHS299 – APRIL 2000

CD54AC163 . . . F PACKAGE

CD74AC163 . . . E OR M PACKAGE

(TOP VIEW)

Internal Look-Ahead for Fast Counting

Carry Output for n-Bit Cascading

Synchronous Counting

CLR

CLK

RCO

Synchronously Programmable

Package Options Include Plastic

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

Ceramic (F) DIPs

description

ENP

GND

ENT

LOAD

The CD54AC163 and CD74AC163 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 instructed by the count-enable (ENP, ENT) inputs and internal gating.

This mode of operation eliminates the output counting spikes normally associated with synchronous

(ripple-clock)counters. Abufferedclock(CLK)inputtriggersthefourflip-flopsontherising(positive-going)edge

of the clock waveform.

The counters 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 synchronous. A low level at the clear (CLR) input sets all four of the flip-flop outputs low

after the next low-to-high transition of CLK, regardless of the levels of the enable inputs. This synchronous clear

allows the count length to be modified easily by decoding the Q outputs for the maximum count desired. The

active-low output of the gate used for decoding is connected to CLR to synchronously clear the counter to 0000

(LLLL).

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

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

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.

These devices 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 CD54AC163 is characterized for operation over the full military temperature range of –55°C to 125°C.

The CD74AC163 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...12

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与CD54AC163_14相关器件

型号	品牌	获取价格	描述	数据表
CD54AC1633A	INTERSIL	获取价格	Synchronous Presettable Binary Counters
CD54AC163E	ETC	获取价格	Logic IC
CD54AC163EN	ETC	获取价格	Logic IC
CD54AC163F	TI	获取价格	4-BIT SYNCHRONOUS BINARY COUNTERS
CD54AC163F3A	TI	获取价格	4-BIT SYNCHRONOUS BINARY COUNTERS
CD54AC163H	GE	获取价格	Binary Counter, AC Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS
CD54AC163HX	GE	获取价格	Binary Counter, AC Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS
CD54AC163M	ETC	获取价格	Logic IC
CD54AC164	INTERSIL	获取价格	8-Bit Serial-In/Parallel-Out Shift Registers
CD54AC164	TI	获取价格	8-Bit Serial-In/Parallel-Out Shift Register

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