CD74HC221中文资料具有复位功能的高速 CMOS 逻辑双路单稳态多谐振荡器数据手册TI规格书

描述 Description

The ’HC221 and CD74HCT221 are dual monostable multivibrators with reset. An external resistor (RX) and an external capacitor (CX) control the timing and the accuracy for the circuit. Adjustment of RX and CX provides a wide range of output pulse widths from the Q and Q\\ terminals. Pulse triggering on the B input occurs at a particular voltage level and is not related to the rise and fall time of the trigger pulse.

Once triggered, the outputs are independent of further trigger inputs on A\\ and B. The output pulse can be terminated by a LOW level on the Reset (R)\\ pin. Trailing Edge triggering (A)\\ and leading-edge-triggering (B) inputs are provided for triggering from either edge of the input pulse. On power up, the IC is reset. If either Mono is not used each input (on the unused device) must be terminated either high or low.

The minimum value of external resistance, RX, is typically 500. The minimum value of external capacitance, CX, is 0pF. The calculation for the pulse width is tW = 0.7 RXCX at VCC = 4.5V.

特性 Features

• Overriding RESET Terminates Output Pulse
• Q and Q\\ Buffered Outputs
• Wide Range of Output-Pulse Widths
• Fanout (Over Temperature Range)
• Bus Driver Outputs . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . –55°C to 125°C
• Significant Power Reduction Compared to LSTTL Logic ICs
• 2V to 6V Operation
• HCT Types
• Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
• CMOS Input Compatibility, Il 1µA at VOL, VOH

Data sheet acquired from Harris Semiconductor