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SN74ALS568AN

更新时间： 2024-11-18 23:06:15
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
20页 608K
描述
SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS WITH 3-STATE OUTPUTS

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SN74ALS568AN 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Obsolete零件包装代码：DIP
包装说明：DIP, DIP20,.3针数：20
Reach Compliance Code：not_compliantHTS代码：8542.39.00.01
Factory Lead Time：1 week风险等级：5.86
其他特性：TCO OUTPUT; CLOCKED CARRY OUTPUT计数方向：BIDIRECTIONAL
系列：ALSJESD-30 代码：R-PDIP-T20
长度：24.325 mm负载电容（CL）：50 pF
负载/预设输入：YES逻辑集成电路类型：DECADE COUNTER
工作模式：SYNCHRONOUS位数：4
功能数量：1端子数量：20
最高工作温度：70 °C最低工作温度：
输出特性：3-STATE封装主体材料：PLASTIC/EPOXY
封装代码：DIP封装等效代码：DIP20,.3
封装形状：RECTANGULAR封装形式：IN-LINE
峰值回流温度（摄氏度）：NOT SPECIFIED电源：5 V
最大电源电流（ICC）：32 mA传播延迟（tpd）：16 ns
认证状态：Not Qualified座面最大高度：5.08 mm
子类别：Counters最大供电电压 (Vsup)：5.5 V
最小供电电压 (Vsup)：4.5 V标称供电电压 (Vsup)：5 V
表面贴装：NO技术：TTL
温度等级：COMMERCIAL端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED触发器类型：POSITIVE EDGE
宽度：7.62 mm最小 fmax：20 MHz
Base Number Matches：1

SN74ALS568AN 数据手册

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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  
A
V
CC  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
13  
RCO  
CCO  
OE  
B
C
D
Q
A
Q
B
ENP  
ACLR  
SCLR  
GND  
Q
C
Q
D
12 ENT  
description  
11  
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.  
3
2
1
20 19  
18  
CCO  
OE  
B
C
4
5
6
7
8
17  
16  
15  
14  
Q
D
A
Q
B
ENP  
ACLR  
Q
C
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.  
Copyright 1995, Texas Instruments Incorporated  
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.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...20

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 		SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS WITH 3-STATE OUTPUTS

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