74F525

更新时间： 2024-01-20 01:42:21

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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

Timing Diagrams

TL/F/9547–5

jWith XTR HIGH, the rising edge of CP loads data from the latches to the counter.

kWith XTR LOW, the rising edge of CP begins count-down cycle.

lWhen the count reaches zero, Q goes HIGH, and Q/2 toggles state.

mThe next occurrence of XTR clears Q.

FIGURE 1. MODE 0 and MODE 1 (Inverse Output of Mode 0)

000, 001

TL/F/9547–6

jWith XTR HIGH, the rising edge of CP loads data from the latches to the counter.

kWith XTR LOW, the rising edge of CP begins the count-down cycle.

lWhen the count reaches zero, Q goes HIGH for one period of CP, and Q/2 toggles state.

FIGURE 2. MODE 2 and MODE 3 (Inverse Output of Mode 2)

010, 011

TL/F/9547–7

FIGURE 3. MODE 4 and MODE 5

100, 101

jWith XTR HIGH, the rising edge of CP loads data from the latches into the counter.

kWith XTR LOW, the rising edge of CP begins the count-down.

lWith XTR HIGH, during count-down, the rising edge of CP does nothing.

mWhen the count reaches zero, Q goes HIGH for one clock cycle and Q/2 toggles state.

Note: Once the count reaches zero, the counter can be reloaded with XTR HIGH.

1 2 345 6 7...10

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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