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HC123 参数 Datasheet PDF下载

HC123图片预览
型号: HC123
PDF下载: 下载PDF文件 查看货源
内容描述: 双可重触发单稳多谐振荡器 [Dual Retriggerable Monostable Multivibrator]
分类和应用: 振荡器
文件页数/大小: 6 页 / 62 K
品牌: SLS [ SYSTEM LOGIC SEMICONDUCTOR ]
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SL74HC123
Dual Retriggerable Monostable Multivibrator
The SL74HC123 is identical in pinout to the LS/ALS123. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
There are two trigger inputs, A INPUT (negative edge) and
B INPUT (positive edge). These inputs are valid for rising/falling
signals.
The device may also be triggered by using the CLR input (positive-
edge) because of the Schmitt-trigger input; after triggering the output
maintains the MONOSTABLE state for the time period determined by
the external resistor R
X
and capacitor C
X
. Taking CLR low breaks this
MONOSTABLE STATE. If the next trigger pulse occurs during the
MONOSTABLE period it makes the MONOSTABLE period longer.
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 3.0 to 6.0 V
Low Input Current: 1.0
µA
High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
SL74HC123N Plastic
SL74HC123D SOIC
T
A
= -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
PIN 16 =V
CC
PIN 8 = GND
Note
(1) C
X
, R
X
, D
X
are external components.
(2) D
X
is a clamping diode.
The external capacitor is charged to V in the stand-by
CC
state, i.e. no trigger. When the supply voltage is turned off
C
X
is discharged mainly through an internal parasitic diode. If
C
X
is sufficiently large and V
CC
decreases rapidy, there will be
some possibility of damaging the I.C. with a surge current or
latch-up. If the voltage supply filter capacitor is large enough
and V
CC
decrease slowly, the surge current is automatically
limited and damage the I.C. is avoided. The maximum forward
current of the parasitic diode is approximately 20 mA.
A
Inputs
B
H
X
H
L
L
X
H
X
L
L
H
L
X
CLR
H
H
H
H
L
*
L
*
H
*
H
*
Outputs
Q
Q
Output
Enable
Inhibit
Inhibit
Output
Enable
Output
Enable
Inhibit
Note
X = don’t care
*
- except for monostable period
SLS
System Logic
Semiconductor