Overview
The MC14538BDR2G, produced by onsemi, is a dual precision retriggerable/resettable monostable multivibrator. This component is designed to generate accurate output pulses over a wide range of widths, determined by external timing components. It is highly versatile, allowing triggering from either edge of an input pulse and featuring separate latched reset inputs. The MC14538BDR2G is pin-for-pin compatible with the MC14528B and CD4528B, making it a reliable choice for various electronic circuits.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage Range | -0.5 to +18.0 | V |
| Input or Output Voltage Range | -0.5 to VDD + 0.5 | V |
| Input or Output Current (DC or Transient) per Pin | ±10 | mA |
| Power Dissipation, per Package | 500 | mW |
| Operating Temperature Range | -55 to +125 | °C |
| Pulse Width Range | 10 μs to 10 s | |
| Output Rise Time (CL = 50 pF, TA = 25°C) | 100 ns (typical) | ns |
| Output Fall Time (CL = 50 pF, TA = 25°C) | 100 ns (typical) | ns |
| Propagation Delay Time A or B to Q or Q | 255 ns (typical) | ns |
| External Timing Resistance RX | Up to 1 MΩ (dependent on capacitor leakage) | Ω |
| External Timing Capacitance CX | No limit (use discharge protection diode for CX > 15 μF) | F |
Key Features
- Unlimited rise and fall time allowed on the A trigger input
- Triggerable from positive (A input) or negative-going edge (B input)
- Separate latched reset inputs
- Capable of driving two low-power TTL loads or one low-power Schottky TTL load
- Pb-free and RoHS compliant
- AEC-Q100 qualified and PPAP capable (NLV prefix models)
- Retriggerable and resettable functionality
Applications
The MC14538BDR2G is suitable for a variety of applications, including:
- Pulse generation and timing circuits
- Reset and trigger circuits in digital systems
- Automotive and industrial control systems (especially NLV prefix models)
- Low-power TTL and Schottky TTL load driving
- Circuits requiring precise and adjustable pulse widths
Q & A
- What is the MC14538BDR2G? The MC14538BDR2G is a dual precision retriggerable/resettable monostable multivibrator produced by onsemi.
- What is the operating voltage range of the MC14538BDR2G? The DC supply voltage range is from 3.0 Vdc to 18 Vdc.
- How is the output pulse width determined? The output pulse width is determined by the external timing components, RX and CX, using the formula T = RX * CX (seconds).
- Can the MC14538BDR2G be triggered from both positive and negative edges? Yes, it can be triggered from either edge of an input pulse.
- What are the key features of the MC14538BDR2G? Key features include unlimited rise and fall time on the A trigger input, separate latched reset inputs, and the ability to drive low-power TTL loads.
- Is the MC14538BDR2G suitable for automotive applications? Yes, especially models with the NLV prefix, which are AEC-Q100 qualified and PPAP capable.
- How does the retrigger function work? The MC14538BDR2G can be retriggered if a valid trigger occurs before the Q output has returned to the quiescent state, extending the output pulse width.
- What precautions should be taken during power-down? Large capacitance values can cause issues; ensure the VDD supply discharges slowly enough to avoid damaging the device.
- Is the MC14538BDR2G Pb-free and RoHS compliant? Yes, it is Pb-free and RoHS compliant.
- What is the typical propagation delay time? The typical propagation delay time from A or B to Q or Q is 255 ns.
