器件名称: M74HC221A
功能描述: DUAL MONOSTABLE MULTIVIBRATOR
文件大小: 288.34KB 共14页
简 介: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 A (MAX.) AT TA=25°C ACTIVE STATE ICC = 700 A (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 oc……
