Overview
The MC1455DR2G is a monolithic timing circuit produced by onsemi, designed to provide highly stable timing functions. This integrated circuit is capable of operating in both monostable (one-shot) and astable (oscillator) modes, making it versatile for various timing applications. The MC1455DR2G is a direct replacement for the NE555 timer and offers precise control over time delays and oscillation frequencies using external resistors and capacitors.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage | VCC | 4.5 | - | 16 | Vdc |
| Supply Current (VCC = 5.0 V, Low State) | ICC | - | - | 6.0 | mA |
| Supply Current (VCC = 15 V, Low State) | ICC | - | - | 15 | mA |
| Discharge Current (Pin 7) | I7 | - | - | 200 | mA |
| Operating Temperature Range | TA | -40 | - | 85 | °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 = 200 mA, VCC = 15 V) | VOL | - | - | 2.5 | 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 astable and monostable modes
- Adjustable duty cycle
- 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
- Pb-free packages available
Applications
- Timing and pulse generation in electronic circuits
- Pulse width modulation (PWM) circuits
- Missing pulse detectors
- Sequential timing circuits
- Alarm and security systems
- Automotive and industrial control systems
Q & A
- What are the operating temperature ranges for the MC1455DR2G?
The MC1455DR2G operates over a temperature range of -40°C to +85°C.
- What is the maximum discharge current of the MC1455DR2G?
The maximum discharge current is 200 mA.
- Can the MC1455DR2G drive TTL circuits?
- How is the timing period calculated in monostable mode?
The timing period in monostable mode is given by the equation t = 1.1 * RA * C, where RA is the external resistor and C is the external capacitor.
- What is the threshold voltage for triggering the MC1455DR2G?
The threshold voltage is 1/3 of the supply voltage (VCC).
- Can the MC1455DR2G be used in astable mode?
- What is the maximum power supply voltage for the MC1455DR2G?
The maximum power supply voltage is 16 Vdc.
- Is the MC1455DR2G available in Pb-free packages?
- How does the reset function work on the MC1455DR2G?
The reset function discharges the capacitor, interrupting the timing cycle. The reset pin should be tied to the supply voltage when not in use.
- What is the temperature stability of the MC1455DR2G?
The temperature stability is 0.005% per °C.
