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SN74ALS568A

更新时间： 2024-11-01 23:06:15

品牌	Logo	应用领域
德州仪器 - TI		计数器输出元件
页数	文件大小	规格书
20页	608K
描述
SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS WITH 3-STATE OUTPUTS

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SN74ALS568A 数据手册

SN54ALS569A, SN74ALS568A, SN74ALS569A

SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS

WITH 3-STATE OUTPUTS

SDAS229A – APRIL 1982 – REVISED JANUARY 1995

SN54ALS569A . . . J PACKAGE

SN74ALS568A, SN74ALS569A . . . DW OR N PACKAGE

(TOP VIEW)

• 3-State Q Outputs Drive Bus Lines Directly

• Counter Operation Independent of 3-State

Output

• Fully Synchronous Clear, Count, and Load

• Asynchronous Clear Is Also Provided

• Fully Cascadable

• Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

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

and Ceramic (J) 300-mil DIPs

U/D

CLK

RCO

CCO

ENP

ACLR

SCLR

GND

12 ENT

description

LOAD

The SN74ALS568A decade counter and

′ALS569A binary counters are programmable,

count up or down, and offer both synchronous and

asynchronous clearing. All synchronous functions

are executed on the positive-going edge of the

clock (CLK) input.

SN54ALS569A . . . FK PACKAGE

(TOP VIEW)

The clear function is initiated by applying a low

level to either asynchronous clear (ACLR) or

synchronousclear(SCLR). Asynchronous(direct)

clearing overrides all other functions of the device,

while synchronous clearing overrides only the

other synchronous functions. Data is loaded from

the A, B, C, and D inputs by holding load (LOAD)

low during a positive-going clock transition. The

counting function is enabled only when enable P

(ENP) and enable T (ENT) are low and ACLR,

SCLR, and LOAD are high. The up/down (U/D)

input controls the direction of the count. These

counters count up when U/D is high and count

down when U/D is low.

20 19

CCO

ENP

ACLR

9 10 11 12 13

A high level at the output-enable (OE) input forces the Q outputs into the high-impedance state, and a low level

enables those outputs. Counting is independent of OE. ENT is fed forward to enable the ripple-carry output

(RCO) to produce a low-level pulse while the count is zero (all Q outputs low) when counting down or maximum

(9 or 15) when counting up. The clocked carry output (CCO) produces a low-level pulse for a duration equal to

that of the low level of the clock when RCO is low and the counter is enabled (both ENP and ENT are low);

otherwise, CCO is high. CCO does not have the glitches commonly associated with a ripple-carry output.

Cascading is normally accomplished by connecting RCO or CCO of the first counter to ENT of the next counter.

However, for very high-speed counting, RCO should be used for cascading since CCO does not become active

until the clock returns to the low level.

The SN54ALS569A is characterized for operation over the full military temperature range of –55°C to 125°C.

The SN74ALS568A and SN74ALS569A are characterized for operation from 0°C to 70°C.

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...20

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与SN74ALS568A相关器件

型号	品牌	获取价格	描述	数据表
SN74ALS568ADW	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS WITH 3-STATE OUTPUTS
SN74ALS568ADW3	TI	获取价格	IC IC,COUNTER,UP/DOWN,DECADE,ALS-TTL,SOP,20PIN,PLASTIC, Counter
SN74ALS568ADWP3	TI	获取价格	IC IC,COUNTER,UP/DOWN,DECADE,ALS-TTL,SOP,20PIN,PLASTIC, Counter
SN74ALS568ADWR	TI	获取价格	ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL DECADE COUNTER, PDSO20, PLASTI
SN74ALS568AFN	TI	获取价格	IC,COUNTER,UP/DOWN,DECADE,ALS-TTL,LDCC,20PIN,PLASTIC
SN74ALS568AFN-00	TI	获取价格	ALS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL DECADE COUNTER, PQCC20
SN74ALS568AJ4	TI	获取价格	IC IC,COUNTER,UP/DOWN,DECADE,ALS-TTL,DIP,20PIN,CERAMIC, Counter
SN74ALS568AJP4	TI	获取价格	IC IC,COUNTER,UP/DOWN,DECADE,ALS-TTL,DIP,20PIN,CERAMIC, Counter
SN74ALS568AN	TI	获取价格	SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS WITH 3-STATE OUTPUTS
SN74ALS568AN1	TI	获取价格	IC,COUNTER,UP/DOWN,DECADE,ALS-TTL,DIP,20PIN,PLASTIC

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