器件名称:
M74HC221M1R
功能描述:
DUAL MONOSTABLE MULTIVIBRATOR
文件大小:
374.21KB 共14页
简 介:
M74HC221 DUAL MONOSTABLE MULTIVIBRATOR s s s s s s s s HIGH SPEED : tPD = 24 ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: STAND BY STATE : ICC=4A (MAX.) at TA=25°C ACTIVE STATE : ICC=700A (MAX.) at VCC = 5V HIGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL WIDE OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V WIDE OUTPUT PULSE WIDTH RANGE : tWOUT = 150 ns ~ 60 s OVER AT V CC = 4.5 V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 221 DIP SOP TSSOP ORDER CODES PACKAGE DIP SOP TSSOP TUBE M74HC221B1R M74HC221M1R T&R M74HC221RM13TR M74HC221TTR DESCRIPTION The M74HC221 is an high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate C2MOS technology. 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 rise and fall time of the applied pulse. The device may also be trigger by using the CLR input (positive edge) because of the Schimtt-trigger input; after PIN CONNECTION AND IEC LOGIC SYMBOLS triggering the output maintains the MONOSTABLE STATE 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 < 3.0V 5K to 1M Vcc > 3.0V 1K to 1M K ……
