Multivibrator archives - Page 3 of 6

Part Number: 74121, DM74121, DM74121N

Function : One-Shot with Clear and Complementary Outputs

Package : DIP 14 Pin Type

Manufacturer: Fairchild Semiconductor

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Features
1. Triggered from active-HIGH transition or active-LOW transition inputs
2. Variable pulse width from 30 ns to 28 seconds
3. Jitter free Schmitt-trigger input
4. Excellent noise immunity typically 1.2V
5. Stable pulse width up to 90% duty cycle
6. TTL, DTL compatible
7. Compensated for VCCand temperature variations
8. Input clamp diodes

Description

The DM74121 is a monostable multivibrator featuring both positive and negative edge triggering with complementary outputs. An internal 2kΩtiming resistor is provided for design convenience minimizing component count and layout problems. this device can be used with a single external capacitor.

74121 Datasheet

Part Number: TC74HC4538, TC74HC4538AP, TC74HC4538AF, TC74HC4538AFT

Function: Dual Retriggerable Monostable Multivibrator

Manufacturer: TOSHIBA

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Description

The TC74HC4538A is a high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate C2 MOS 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 (positive edge input), and B input (negative edge input). These inputs are valid for a slow rise/fall time signal (tr =tf =1 s) as they are schmitt trigger inputs. After triggering, the output stays in a MONOSTABLE state for the time period determined by the external resistor and capacitor (RX, CX). A low level at CD input breaks this STABLE STATE. In the MONOSTABLE state, if a new trigger is applied, it makes the MONOSTABLE period longer (retrigger mode).

Features (Note)
• High speed: tpd =25 ns (typ.) at VCC =5 V
• Low power dissipation
Stand by state: ICC =4 μA (max) at Ta =25°C
Active state: ICC =300 μA (max) at Ta =25°C
• High noise immunity: VNIH =VNIL =28% VCC(min)
• Output drive capability: 10 LSTTL loads
• Symmetrical output impedance: |IOH| =IOL =4 mA (min)