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SN74ALS161BNSR

更新时间： 2024-02-11 01:34:38

品牌	Logo	应用领域
德州仪器 - TI		计数器
页数	文件大小	规格书
27页	689K
描述
SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS

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数据手册
替代型号

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SN74ALS161BNSR 数据手册

SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161, SN54AS163

SN74ALS161B, SN74ALS163B, SN74AS161, SN74AS163

SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS

SDAS276A – DECEMBER 1994 – REVISED JULY 2000

SN54ALS161B, SN54ALS162B, SN54ALS163B,

Internal Look-Ahead Circuitry for Fast

Counting

SN54AS161, SN54AS163 . . . J PACKAGE

SN74ALS161B, SN74AS161,

Carry Output for n-Bit Cascading

Synchronous Counting

Synchronously Programmable

SN74AS163 . . . D OR N PACKAGE

SN74ALS163B . . . D, DB, OR N PACKAGE

(TOP VIEW)

Package Options Include Plastic

CLR

CLK

RCO

Small-Outline (D) and Shrink Small-Outline

(DB) Packages, Ceramic Chip Carriers (FK),

Standard Plastic (N) and Ceramic (J) DIPs

description

ENT

ENP

GND

These synchronous, presettable, 4-bit decade

and binary counters feature an internal carry

look-ahead circuitry for application in high-speed

counting designs. The SN54ALS162B is a 4-bit

decade counter. The ’ALS161B, ’ALS163B,

’AS161, and ’AS163 devices are 4-bit binary

counters. Synchronous operation is provided by

having all flip-flops clocked simultaneously so that

the outputs change coincidentally 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 asynchronous (ripple-clock)

counters. A buffered clock (CLK) input triggers the

four flip-flops on the rising (positive-going) edge of

the clock input waveform.

LOAD

SN54ALS161B, SN54ALS162B, SN54ALS163B,

SN54AS161, SN54AS163 . . . FK PACKAGE

(TOP VIEW)

20 19

9 10 11 12 13

These counters are fully programmable; they can

be preset to any number between 0 and 9 or 15.

Because presetting is synchronous, setting up a

low level at the load (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.

NC – No internal connection

The clear function for the ’ALS161B and ’AS161 devices 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, or enable inputs. The clear

function for the SN54ALS162B, ’ALS163B, and ’AS163 devices is synchronous, and a low level at CLR sets

all four of the flip-flop outputs low after the next clock pulse, 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 and ENT inputs and a ripple-carry (RCO) output are instrumental in accomplishing this

function. Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. RCO, thus enabled,

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.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

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...27

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SN74ALS161BNSR 替代型号

型号	品牌	替代类型	描述	数据表
SN74ALS161BDRE4	TI	完全替代	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74ALS161BDR	TI	完全替代	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74ALS161BD	TI	完全替代	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS

与SN74ALS161BNSR相关器件

型号	品牌	获取价格	描述	数据表
SN74ALS161BNSRE4	TI	获取价格	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74ALS161BNSRG4	TI	获取价格	Synchronous 4-Bit Binary Counters 16-SO 0 to 70
SN74ALS161N	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,ALS-TTL,DIP,16PIN,PLASTIC
SN74ALS161N1	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,ALS-TTL,DIP,16PIN,PLASTIC
SN74ALS161N3	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,ALS-TTL,DIP,16PIN,PLASTIC
SN74ALS161NP1	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,ALS-TTL,DIP,16PIN,PLASTIC
SN74ALS161NP3	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,ALS-TTL,DIP,16PIN,PLASTIC
SN74ALS1620-1N	TI	获取价格	IC IC,BUS TRANSCEIVER,SINGLE,8-BIT,ALS-TTL,DIP,20PIN,PLASTIC, Bus Driver/Transceiver
SN74ALS1620-1N1	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,ALS-TTL,DIP,20PIN,PLASTIC
SN74ALS1620-1N-10	TI	获取价格	ALS SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDIP20

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