Overview
The MC1455P1G is a monolithic timing circuit produced by onsemi, designed to provide highly stable timing functions. It is capable of operating in both monostable (one-shot) and astable (oscillator) modes. This component is a direct replacement for the NE555 timers and offers a wide range of applications due to its versatility and precision in timing control.
The MC1455P1G can generate accurate time delays ranging from microseconds to hours, and its output can source or sink up to 200 mA, making it suitable for driving TTL circuits. The device is available in Pb-free packages, ensuring compliance with environmental regulations.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage | VCC | 4.5 | - | 16 | Vdc |
| Supply Current (VCC = 5.0 V, RL = ∞) | ICC | - | 6.0 | 15 | mA |
| Discharge Current (Pin 7) | I7 | - | - | 200 | mA |
| Operating Temperature Range | TA | 0 | - | 70 | °C |
| Maximum Operating Die Junction Temperature | TJ | - | - | 150 | °C |
| Threshold Voltage/Supply Voltage | Vth/VCC | - | 2/3 | - | - |
| Trigger Voltage (VCC = 15 V) | VT | - | 5.0 | - | V |
| Reset Voltage | VR | 0.4 | 0.7 | 1.0 | V |
| Output Voltage Low (ISink = 10 mA, VCC = 15 V) | VOL | - | - | 0.1 | V |
| Output Voltage High (ISource = 200 mA, VCC = 15 V) | VOH | - | - | 12.75 | V |
Key Features
- Direct replacement for NE555 timers
- Timing from microseconds through hours
- Operates in both monostable and astable modes
- Adjustable duty cycle in astable mode
- High current output can source or sink up to 200 mA
- Output can drive TTL circuits
- Temperature stability of 0.005% per °C
- Normally ON or Normally OFF output configuration
- Pb-free packages available
Applications
- Linear Voltage Ramp: Can be used to generate a linear ramp voltage by replacing the resistor with a constant current source.
- Missing Pulse Detector: Can detect when an input pulse fails to occur within a specified time delay.
- Pulse Width Modulation: Can vary the charge time of the capacitor by changing the control voltage in monostable mode.
- Timing and Oscillation: Suitable for various timing and oscillation applications due to its precise control over time delays and frequencies.
Q & A
- What are the operating temperature ranges for the MC1455P1G?
The operating temperature range for the MC1455P1G is from 0°C to +70°C.
- What is the maximum discharge current for the MC1455P1G?
The maximum discharge current for the MC1455P1G is 200 mA.
- Can the MC1455P1G drive TTL circuits?
- What is the temperature stability of the MC1455P1G?
The temperature stability of the MC1455P1G is 0.005% per °C.
- What are the typical supply current values for the MC1455P1G?
The typical supply current values for the MC1455P1G are 6.0 mA at VCC = 5.0 V and 15 mA at VCC = 15 V.
- How is the time delay calculated in monostable mode?
The time delay in monostable mode is calculated using the equation t = 1.1 * RA * C, where RA is the external resistor and C is the external capacitor.
- What is the purpose of the reset pin on the MC1455P1G?
The reset pin is used to discharge the capacitor, interrupting the timing cycle. It should be tied to VCC when not in use.
- Can the MC1455P1G be used in astable mode?
- What is the maximum power supply voltage for the MC1455P1G?
The maximum power supply voltage for the MC1455P1G is 16 Vdc.
- Is the MC1455P1G available in Pb-free packages?
