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M74HC123AC1R Datasheet(PDF) 1 Page - STMicroelectronics

No. de pieza M74HC123AC1R
Descripción Electrónicos  DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC123AC1R Datasheet(HTML) 1 Page - STMicroelectronics

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M54HC123/123A
M74HC123/123A
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 = 200
µA (TYP.) 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
54/74LS123
The M54/74HC123 is a high speed CMOS MONO-
STABLE multivibrator fabricated with silicon gate
C
2MOS technology. It achieves the high speed
operation similar to equivalent LSTTL while main-
taining the CMOS low power dissipation. There are
two trigger inputs, A INPUT (negative edge) and 8
INPUT (positive edge). These inputs are valid for
slow rising/falling signals, (tr = tf = I sec). The device
may also be triggered by using the CLR input (posi-
tive-edge) because of the Schmitt-trigger input ;
after triggering the output maintains the MONO-
STABLE state for the time period determined by the
external resistor Rx and capacitor Cx. When Cx
10nF and Rx
≥ 10KΩ, the output pulse width value
is approssimatively given by the formula: tw(out) =K
• Cx • Rx.
Two different pulse width constant are available:
K
≅ 0.45 for HC123
K
≅ 1 for HC123A.
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
DESCRIPTION
1/14


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