SN54HC161WR

更新时间： 2024-11-02 13:13:47

品牌	Logo	应用领域
德州仪器 - TI		计数器
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14页	203K
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SN54HC161WR 数据手册

SN54HC161, SN74HC161

4-BIT SYNCHRONOUS BINARY COUNTERS

SCLS297A – JANUARY 1996 – REVISED MAY 1997

SN54HC161 . . . J OR W PACKAGE

SN74HC161 . . . D OR N 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 (D) and Ceramic Flat (W)

Packages, Ceramic Chip Carriers (FK), and

Standard Plastic (N) and Ceramic (J)

300-mil DIPs

ENT

ENP

GND

LOAD

description

These synchronous, presettable counters feature

an internal carry look-ahead for application in

high-speed counting designs. The ’HC161 are

4-bit binary counters. 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.

SN54HC161 . . . FK PACKAGE

(TOP VIEW)

20 19

9 10 11 12 13

These counters are fully programmable; that is,

they can be preset to any number between 0 and

9 or 15. As presetting is synchronous, 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.

NC – No internal connection

The clear function for the ’HC161 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.

These 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 SN54HC161 is characterized for operation over the full military temperature range of –55°C to 125°C. The

SN74HC161 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...14

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与SN54HC161WR相关器件

型号	品牌	获取价格	描述	数据表
SN54HC162	TI	获取价格	SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS
SN54HC162FH	TI	获取价格	IC,COUNTER,UP,DECADE,HC-CMOS,LLCC,20PIN,CERAMIC
SN54HC162FK	TI	获取价格	HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CQCC20, CERAMIC, LCC-20
SN54HC162FK-00	TI	获取价格	HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CQCC20
SN54HC162J	ROCHESTER	获取价格	Decade Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, C
SN54HC162J	TI	获取价格	HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT UP DECADE COUNTER, CDIP16, 0.300 INCH, CER
SN54HC163	TI	获取价格	4-BIT SYNCHRONOUS BINARY COUNTERS
SN54HC163_15	TI	获取价格	4-BIT SYNCHRONOUS BINARY COUNTERS
SN54HC163FH	TI	获取价格	IC,COUNTER,UP,4-BIT BINARY,HC-CMOS,LLCC,20PIN,CERAMIC
SN54HC163FH	ROCHESTER	获取价格	Binary Counter,

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