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M74HC123 Datasheet

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

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M74HC123 pdf
M54HC123/123A
M74HC123/123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
. 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
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCXXXF1R M74HCXXXM1R
M74HCXXXB1R M74HCXXXC1R
DESCRIPTION
The M54/74HC123 is a high speed CMOS MONO-
STABLE multivibrator fabricated with silicon gate
C2MOS 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 10K, 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 to 1 M
VCC 3.0 V 1 K to 1 M
All inputs are equipped with protection circuits
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
October 1993
1/14


STMicroelectronics Electronic Components Datasheet

M74HC123 Datasheet

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

No Preview Available !

M74HC123 pdf
M54/M74HC123/123A
SYSTEM DIAGRAM
TIMING CHART
2/14


Part Number M74HC123
Description DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
Maker ST Microelectronics
Total Page 14 Pages
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