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, AINPUT (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.

■ HIGH SPEED

tPD = 25 ns (TYP) at VCC = 5V

■ LOW POWER DISSIPATION

STANDBYSTATE ICC=4 µA (MAX.) AT TA=25°C

ACTIVESTATE ICC =700µA (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