TC74VHC123AFK

TC74VHC123AF/AFK,TC74VHC221AF/AFK CMOS Digital Integrated Circuits Silicon Monolithic TC74VHC123AF,TC74VHC123AFK, TC74VHC221AF,TC74VHC221AFK 1. Functional Description Dual Monostable Multivibrator TC74VHC123AF/AFK: Retriggerable TC74VHC221AF/AFK: Non-Retriggerable 2. General The TC74VHC123A/221A are 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). These inputs are valid for a slow rise/fall time signal (tr = tf = 1 s) as they are schmitt trigger inputs. This device may also be triggered by using CLR input (positive edge). After triggering, the output stays in a MONOSTABLE state for a time period determined by the external resistor and capacitor (RX, CX). A low level at the CLR input breaks this state. Limits for CX and RX are: External capacitor, CX: No limit External resistor, RX: VCC = 2.0 V more than 5 kΩ VCC ≥ 3.0 V more than 1 kΩ An input protection circuit ensures that 0 to 5.5 V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5 V to 3 V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages. 3. Features (Note) (1) High speed: Propagation delay time = 8.1 ns (typ.) at VCC = 5.0 V (2) Low power dissipation: Standby state: 4.0 µA (max) at Ta = 25  Active state: 750 µA (max) at Ta = 25  (3) High noise imm...