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Dual retriggerable monostable multivibrator with reset
The 74AHC123A; 74AHCT123A is a dual retriggerable monostable multivibrator with reset. The basic output pulse width is programmed by selection of external components (REXT and CEXT). Once triggered this basic pulse width may be extended by retriggering either of the edge triggered inputs (nA or (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD. Inputs are overvoltage tolerant. This feature allows the use of these devices as translators in mixed voltage environments.
Wide supply voltage range from 2.0 V to 5.5 V
DC triggered from active HIGH or active LOW inputs
Retriggerable for very long pulses up to 100 % duty factor
Direct reset terminates output pulse
Overvoltage tolerant inputs to 5.5 V
All inputs have a Schmitt-trigger action
High noise immunity
Input levels:
For 74AHC123A: CMOS level
For 74AHCT123A: TTL level
ESD protection:
HBM JESD22-A114E exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
CDM JESD22-C101C exceeds 1000 V
Latch-up performance exceeds 100 mA per JESD 78 Class II Level A
Multiple package options
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
| Type number | Product status | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 74AHC123ABQ | Production | 2.0 - 5.5 | CMOS | ± 8 | 5.1 | low | -40~125 | 94 | 14.4 | 63 | DHVQFN16 |
| 74AHC123AD | Production | 2.0 - 5.5 | CMOS | ± 8 | 5.1 | low | -40~125 | 93 | 10.1 | 53 | SO16 |
| 74AHC123APW | Production | 2.0 - 5.5 | CMOS | ± 8 | 5.1 | low | -40~125 | 126 | 4.8 | 55.7 | TSSOP16 |
| 74AHCT123ABQ | Production | 4.5 - 5.5 | TTL | ± 8 | 5.0 | low | -40~125 | 94 | 14.4 | 63 | DHVQFN16 |
| 74AHCT123AD | Production | 4.5 - 5.5 | TTL | ± 8 | 5.0 | low | -40~125 | 93 | 10.1 | 53 | SO16 |
| 74AHCT123APW | Production | 4.5 - 5.5 | TTL | ± 8 | 5.0 | low | -40~125 | 126 | 4.8 | 55.7 | TSSOP16 |
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