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SN74AS161D

更新时间： 2024-09-30 23:03:11

品牌	Logo	应用领域
德州仪器 - TI		计数器触发器逻辑集成电路光电二极管输出元件
页数	文件大小	规格书
14页	222K
描述
SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS

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替代型号

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SN74AS161D 数据手册

SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161, SN54AS163

SN74ALS161B, SN74ALS163B, SN74AS161, SN74AS163

SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS

SDAS276 – DECEMBER 1994

SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161,

• Internal Look-Ahead Circuitry for Fast

SN54AS163 . . . J PACKAGE

SN74ALS161B, SN74ALS163B, SN74AS161,

SN74AS163 . . . D OR N PACKAGE

(TOP VIEW)

Counting

• Carry Output for n-Bit Cascading

• Synchronous Counting

• Synchronously Programmable

• Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

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

Ceramic (J) 300-mil DIPs

CLR

CLK

RCO

ENT

description

ENP

GND

LOAD

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 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.

SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161,

SN54AS163 . . . FK PACKAGE

(TOP VIEW)

20 19

9 10 11 12 13

These counters are fully programmable; they may

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 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 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,

produces a high-level pulse while the count is maximum (9 or 15 with Q high). The 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.

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...14

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SN74AS161D 替代型号

型号	品牌	替代类型	描述	数据表
SN74AS161NSR	TI	完全替代	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74AS161DR	TI	完全替代	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74AS161N	TI	完全替代	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS

与SN74AS161D相关器件

型号	品牌	获取价格	描述	数据表
SN74AS161DE4	TI	获取价格	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74AS161DG4	TI	获取价格	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74AS161DR	TI	获取价格	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74AS161DRE4	TI	获取价格	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74AS161DRG4	TI	获取价格	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74AS161FN-00	TI	获取价格	AS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PQCC20
SN74AS161J4	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,AS-TTL,DIP,16PIN,CERAMIC
SN74AS161JP4	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,AS-TTL,DIP,16PIN,CERAMIC
SN74AS161N	TI	获取价格	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN74AS161N1	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,AS-TTL,DIP,16PIN,PLASTIC

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