The CD4538 is a dual, precision monostable multivibrator with independent trigger and reset controls. The device is re-triggerable and resettable, and the control inputs are internally latched. The CD4538 IC has a wide range of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL configurations. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers. The IC also offers features such as ESD barring and Thermal overload safety.
Monostable Multivibrator?
A monostable multivibrator (MMV), often called a one-shot multivibrator, is a pulse generator circuit in which the duration of the pulse is determined by the R-C network, connected externally to the 555 timers. In such a vibrator, one state of output is stable while the other is quasi-stable (unstable). For auto-triggering of output from a quasi-stable state to a stable state, energy is stored by an externally connected capacitor to a reference level. The time taken in storage determines the pulse width.
CD4538 Key Features
- Wide supply voltage range: 3.0V to 15V
- High noise immunity: 0.45 VCC (typ.)
- Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS
- New formula: PWOUT = RC (PW in seconds, R in Ohms, C in Farads)
- ±1.0% pulse-width variation from part to part (typ.)
- Wide pulse-width range: 1 µs to ∞
- Separate latched reset inputs
- Symmetrical output sink and source capability
- Low standby current: 5 nA (typ
CD4538 Pinout
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | TIA | Transition A1 from LOW-to-HIGH |
| 2 | T2A | Transition A2 from LOW-to-HIGH |
| 3 | CDA | Capacitor of transition A |
| 4 | A1 IN | input A1 of multivibrator 1 |
| 5 | B1 IN | input B1 of multivibrator 1 |
| 6 | QA-OUT | output of multivibrator A |
| 7 | QA’ OUT | invert output of multivibrator A |
| 8 | VSS | source supply |
| 9 | QB’OUT | invert output of multivibrator B |
| 10 | QB-OUT | output of multivibrator B |
| 11 | A2 IN | input A2 of multivibrator 2 |
| 12 | B2 IN | input B2 of multivibrator 2 |
| 13 | CDB | capacitor of transition B |
| 14 | T1B | Transition B1 from HIGH-to-LOW |
| 15 | T2B | Transition B2 from HIGH-to-LOW |
| 16 | VDD | Drain supply |
Application
- It is generally used in devices such as delay timers & gated circuits, etc.
CD4538 Datasheet
You can download the datasheet for CD4538 Dual Precision Monostable Multivibrator IC from the link given below:
See Also: 74LS122 Retriggerable Monostable Multivibrator IC | 74LS109 Dual JK Positive Edge-Triggered Flip-Flop IC | 74LS92 4-Bit Divide By Twelve Binary Counter IC
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