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HD74HC4538FPEL 参数 Datasheet PDF下载

HD74HC4538FPEL图片预览
型号: HD74HC4538FPEL
PDF下载: 下载PDF文件 查看货源
内容描述: 双路精密可重触发/复式单稳态多谐振荡器 [Dual Precision Retriggerable/Resettable Monostable Multivibrators]
分类和应用: 振荡器预分频器多谐振动器逻辑集成电路光电二极管时钟
文件页数/大小: 14 页 / 204 K
品牌: RENESAS [ RENESAS TECHNOLOGY CORP ]
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HD74HC4538
Quiescent
State
Trigger Cycle (A Input)
Trigger Cycle (B Input)
Reset
t
rr
Retrigger
7
Trigger Input A
(Pin 4 or 12)
Trigger Input B
(Pin 5 or 11)
8
Reset Input C
D
(Pin 3 or 13)
21
9
24
14
11
15
20 23
Trigger-Control
Circuit Output
T
2
Input
(Pin 2 or 14)
Upper Reference
Circuit Output
Lower Reference
Circuit Output
Reset Latch
Output
3
4
12
17
Vref Lower
13
5
13
6
16
Vref Upper
25
1
22
10
Q Output
(Pin 6 or 10)
2
19
t
WQ
t
W (H)
A
50%
t
WQ
t
WQ
+t
rr
t
W (L)
B
t
PLH
Q
50%
t
PHL
Q
50%
t
PHL
t
WQ
50%
t
PLH
A
t
rr
B
t
f
C
D
t
TLH
Q
t
THL
Q
90%
10%
90%
10%
t
PLH
50%
50%
t
W (L)
t
PHL
50%
t
r
90%
10%
t
WQ
+t
rr
50%
(Retriggered Pulse)
50%
Figure 2. Timing Diagram
Rev.2.00 Mar 30, 2006 page 7 of 13