74F525

更新时间： 2024-02-25 11:11:38

品牌	Logo	应用领域
美国国家半导体 - NSC		计数器
页数	文件大小	规格书
10页	174K
描述
Programmable Counter

阅读下载

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

74F525 技术参数

生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP,	针数：	28
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.83	其他特性：	PROGRAMMABLE 16 BIT DOWN COUNTER; 8 MODES OF OPERATION; DIVIDE BY N AND N/2 OUTPUTS AVAILABLE
计数方向：	DOWN	系列：	F/FAST
JESD-30 代码：	R-PDIP-T28	负载/预设输入：	YES
逻辑集成电路类型：	DIVIDE BY N COUNTER	工作模式：	ASYNCHRONOUS
功能数量：	1	端子数量：	28
最高工作温度：	70 °C	最低工作温度：
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装形状：	RECTANGULAR	封装形式：	IN-LINE
传播延迟（tpd）：	22 ns	认证状态：	Not Qualified
最大供电电压 (Vsup)：	5.25 V	最小供电电压 (Vsup)：	4.75 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	端子位置：	DUAL
触发器类型：	POSITIVE EDGE	最小 fmax：	60 MHz

74F525 数据手册

Functional Description (Continued)

MODE 6: Retriggerable Synchronous One-Shot

Function Table

When XTR is HIGH, the data in the data latches is loaded

into the counter upon the positive edge of CP. The negative

edge of XTR enables the count-down to begin with the next

positive edge of CP, wehre Q, normally LOW, is then

brought HIGH and the counter is decremented when the

count reaches zero, Q is brought LOW, and Q/2 is toggled.

Bringing XTR HIGH during the count-down will allow the

data in the data latches to be loaded into the counter with

the next positive edge of CP, but will not affect Q. See Fig-

ure 4. NOTE that the pulse width of Q will be N-1 clock

cycles, where N is the number loaded into the counter.

Function

Mode 0

Mode 1

Mode 2

Mode 3

Mode 4

Mode 5

Mode 6

Mode 7

results.

1 should not be used as this may cause unpredictable

MODE 4: Interval Timer, Pulse Output with Count Hold

MODE 7: Frequency Generator

While XTR is HIGH, the data in the data latches is loaded

into the counter upon the next positive edge of CP. The

negative edge of XTR enables the count-down to begin with

the next positive edge of CP. When the count reaches zero,

Q, normally low, is brought HIGH for a single period of CP.

Q/2 toggles state on the positive edge of Q. Taking XTR

HIGH before the counters reach zero, stops the count-down

from the point where it was held. Data cannot be reloaded

into the counter until a count of zero is reached. See Figure

When XTR is HIGH, the data in the data latches is loaded

into the counter upon the positive edge of CP. The negative

edge of XTR enables the count-down to begin with the next

positive edge of CP. When the count reaches zero, Q, nor-

mally LOW, is brought HIGH for a single period of CP and

Q/2 is toggled. The same clock edge that brings Q HIGH,

also loads the data in the data latches into the counter. The

counter will start to count on the next positive edge of CP.

This mode will run continuously after an initial XTR until

stopped by MR. Taking XTR HIGH at any time causes the

data in the data latches to be loaded into the counter and Q

output to be cleared with the next positive edge of CP. See

Figure 5.

MODE 5: Interval Timer, Inverted Pulse Output with

Count Hold

The operation is exactly the same as Mode 4 except that Q

is normally HIGH and goes LOW for a single period of CP.

Q/2 toggles on the negative-edge of Q. See Figure 3.

Block Diagram

TL/F/9547–4

1 234 5 6 7...10

下载PDF

与74F525相关器件

型号	品牌	描述	获取价格	数据表
74F525DC	FAIRCHILD	Divide By N Counter, F/FAST Series, Asynchronous, Positive Edge Triggered, Down Direction,	获取价格
74F525DCQR	TI	F/FAST SERIES, ASYN POSITIVE EDGE TRIGGERED DOWN DIVIDE BYN COUNTER, CDIP28, CERAMIC, DIP-	获取价格
74F525FCQR	TI	F/FAST SERIES, ASYN POSITIVE EDGE TRIGGERED DOWN DIVIDE BYN COUNTER, CDFP28, FP-28	获取价格
74F525L1C	FAIRCHILD	Divide By N Counter, F/FAST Series, Asynchronous, Positive Edge Triggered, Down Direction,	获取价格
74F525L1CQR	FAIRCHILD	Divide By N Counter, F/FAST Series, Asynchronous, Positive Edge Triggered, Down Direction,	获取价格
74F525PC	FAIRCHILD	Divide By N Counter, F/FAST Series, Asynchronous, Positive Edge Triggered, Down Direction,	获取价格

与74F525相关文章

PCF8574资料解读：主要参数分析、引脚说明
2024-05-21

6
AD637数据手册解读：主要特性、引脚及其功能解读、电气参数
2024-05-21

5
ADUM1201资料手册解读：参数分析、引脚说明、应用分析
2024-05-21

8
一文带你了解压敏电阻器在直流电路中的过压保护作用
2024-05-21

4

产品中心

服务支持

精选活动

关于我们

帮助中心

74F525

74F525 技术参数

74F525 数据手册

与74F525相关器件

与74F525相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

74F525

74F525 技术参数

74F525 数据手册

与74F525相关器件

与74F525相关文章

您还可以找

您在本页遇到什么问题？