The MM54/74HC123A high speed monostable multivibrators (one shots) utilize advanced silicon-gate CMOS technology. They feature speeds comparable to low power Schottky TTL circuitry while retaining the low power and high noise immunity characteristic of CMOS circuits.
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken low resets the one shot. The ’HC123 can be triggered on the positive transition of the clear while A is held low and B is held high.
The ’HC123A is retriggerable. That is it may be triggered repeatedly while their outputs are generating a pulse and the pulse will be extended.
Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques. The output pulse equation is simply: PWe(REXT) (CEXT); where PW is in seconds, R is in ohms, and C is in farads. All inputs are protected from damage due to static discharge by diodes to VCC and ground.
MM74HC123AN Features
■ Typical propagation delay: 25 ns
■ Wide power supply range: 2V–6V
■ Low quiescent current: 80 μA maximum (74HC Series)
■ Low input current: 1 μA maximum
■ Fanout of 10 LS-TTL loads
■ Simple pulse width formula T = RC
■ Wide pulse range: 400 ns to ∞ (typ)
■ Part to part variation: ±5% (typ)
■ Schmitt Trigger A & B inputs enable infinite signal input rise and fall times.
Specifications
Attribute | Attribute Value |
---|---|
Manufacturer | onsemi |
Product Category | Multivibrators |
Series | 74HC |
Packaging | Tube |
Package-Case | 16-DIP (0.300", 7.62mm) |
Operating-Temperature | -40°C ~ 85°C |
Mounting-Type | Through Hole |
Voltage-Supply | 2 V ~ 6 V |
Supplier-Device-Package | 16-DIP |
Current-Output-High-Low | 5.2mA, 5.2mA |
Logic-Type | Monostable |
Schmitt-Trigger-Input | Yes |
Independent-Circuits | 2 |
Propagation-Delay | 22ns |
Form,Package,Functional compatible component
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