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M74HC221 Datasheet

DUAL MONOSTABLE MULTIVIBRATOR

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M54HC221/221A
M74HC221/221A
DUAL 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 = 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 = 150 ns 60 s OVER AT VCC = 4.5 V
. PIN AND FUNCTION COMPATIBLE WITH
54/74LS221
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCXXXF1R M74HCXXXXM1R
M74HCXXXB1R M74HCXXXC1R
DESCRIPTION
The M54/74HC221/221A are high speed CMOS
MONOSTABLE multivibrators fabricated with sili-
con gate C2MOS technology. It achieves 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). Triggering on the B input
occurs at a particular voltage threshold and is not re-
lated to the rise and fall time of the applied pulse.
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
MONOSTABLEstate for the time period determined
by the external resistor Rx and capacitor Cx.Taking
CLR low breaks this MONOSTABLE STATE. If the
next trigger pulse occurs during the MONOSTABLE
period 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
Two different pulse width constants are available:
K 0.7 for HC221
K 1 for HC221A
All inputs are equipped with protection circuits
against static discharge and transient excess volt-
age.
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
October 1993
1/14


STMicroelectronics Electronic Components Datasheet

M74HC221 Datasheet

DUAL MONOSTABLE MULTIVIBRATOR

No Preview Available !

M54/M74HC221/221A
SYSTEM DIAGRAM
TIMING CHART
2/14


Part Number M74HC221
Description DUAL MONOSTABLE MULTIVIBRATOR
Maker ST Microelectronics
Total Page 14 Pages
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