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M74HC221

ST Microelectronics
Part Number M74HC221
Manufacturer ST Microelectronics
Description DUAL MONOSTABLE MULTIVIBRATOR
Published May 6, 2005
Detailed Description M54HC221/221A M74HC221/221A DUAL MONOSTABLE MULTIVIBRATOR . . . . . . . . . HIGH SPEED tPD = 25 ns (TYP) at VCC = 5V L...
Datasheet PDF File M74HC221 PDF File

M74HC221
M74HC221

Overview
M54HC221/221A M74HC221/221A DUAL MONOSTABLE MULTIVIBRATOR .
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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) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HCXXXF1R M74HCXXXXM1R M74HCXXXB1R M74HCXXXC1R DESCRIPTION The M54/74HC221/221A are high speed CMOS MONOSTABLE multivibrators fabricated with silicon 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 related 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 Ω to 1 M Ω VCC ≥ 3.
0 V 1 K Ω to 1 M Ω 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 voltage.
October 1993 PIN CONNECTIONS (top view) NC = No Internal Connection 1/14 M54/M74HC221/221A SYSTEM DIAGRAM TIMING CHART 2/14...


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