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M74HC423B1R Folha de dados(PDF) 1 Page - STMicroelectronics

Nome de Peças M74HC423B1R
Descrição Electrónicos  DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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M54HC423/423A
M74HC423/423A
October 1993
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
B1R
(Plastic Package)
ORDER CODES :
M54HCXXXF1R
M74HCXXXM1R
M74HCXXXB1R
M74HCXXXC1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
.
HIGH SPEED
tPD = 25 ns (TYP) at VCC =5V
.
LOW POWER DISSIPATION
STANDBY STATE ICC=4
µA (MAX.) AT TA=25°C
ACTIVE STATE ICC = 700
µA (MAX.)AT VCC=5V
.
HIGH NOISE IMMUNITY
VNIH =VNIL =28 % VCC (MIN.)
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL = 4 mA (MIN.)
.
BALANCED PROPAGATION DELAYS
tPLH =tPHL
.
WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
.
WIDE OUTPUT PULSE WIDTH RANGE
tWOUT = 120 ns
∼ 60 s OVER AT VCC = 4.5 V
.
PIN AND FUNCTION COMPATIBLE WITH
54/74LS423
The M54/74HC423/423A are high speed CMOS
MONOSTABLE
multivibrators
fabricated
with
silicon gate C
2MOS technology.
They achieve the high speed operation similar to
equivalent LSTTL while maintaining the CMOS low
power dissipation. There are two trigger inputs, A
INPUT (negative edge) and B INPUT (positive
edge). These inputs are valid for rising/falling
signals, (tr –tf – 1 sec). After triggering the output
maintains the MONOSTABLE state for the time
period determined by the external resistor Rx and
capacitor Cx.
Two different pulse width constant are available:
K
≅ 0.46 for HC423
K
≅ 1 for HC423A.
Taking CLR low breaks this MONOSTABLE
STATE. If the next trigger pulse occurs during the
MONOSTABLEperiod it makes the MONOSTABLE
period longer. Limit for values of Cx and Rx :
Cx : NO LIMIT
Rx : VCC < 3.0 V 5 K
Ω to 1 M Ω
VCC
≥ 3.0 V 1 K Ω to 1 M Ω
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
DESCRIPTION
1/14


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