M74HC221 Dual Monostable Multivibrator

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 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 5KΩ to 1MΩ
- Vcc ≥ 3.0V 1KΩ to 1MΩ

K 0.7

All inputs are equipped with protection circuits against static discharge and transient excess voltage

技术特性

HIGH SPEED :
- tPD = 24 ns (TYP.) at VCC = 6V
LOW POWER DISSIPATION:
- STAND BY STATE :
  - ICC=4mA (MAX.) at TA=25°C
- ACTIVE STATE :
  - ICC=700mA (MAX.) at VCC = 5V
HIGH NOISE IMMUNITY:
- VNIH = VNIL = 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 VCC = 4.5 V
PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 221

M74HC221 订购信息

订购型号	产品状态	美金价格	数量	封装	包装形式	温度范围	材料声明
M74HC221TTR	Active		1000	TSSOP 16	Tape And Reel		M74HC221TTR
M74HC221RM13TR	Active		1000	SO-16	Tape And Reel		M74HC221RM13TR
M74HC221B1R	Active		1000	PDIP 16	Tube		M74HC221B1R

DATASHEET

描述	版本	大小
M74HC221 : DS0261: Dual monostable multivibrator	1	370KB