Overview
The SE555D, produced by Texas Instruments, is a precision timing circuit that belongs to the 555 timer family. This device is capable of producing accurate time delays or oscillation, making it versatile for various timing applications. Although the SE555D is currently out of production, it remains a significant component in the realm of electronic design due to its robust features and wide operating range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | 8-SOIC (0.154", 3.90mm Width) | |
| Operating Temperature Range | -55°C to 125°C | °C |
| Supply Voltage Range | 4.5V to 18V | V |
| Output Current | ±200 mA | mA |
| Trigger Voltage Level | Approximately one-third of VCC | V |
| Threshold Voltage Level | Approximately two-thirds of VCC | V |
| Low Level Output Voltage | 0.25 V to 0.7 V (ISINK = 10 mA to 50 mA) | V |
| Propagation Delay Time | 12 ns (typical) | ns |
Key Features
- Timing from microseconds to hours
- Astable or monostable operation
- Adjustable duty cycle
- TTL-compatible output can sink or source up to 200 mA
- QML-V qualified and rad-tolerant (25 kRad Si TID)
- Military temperature range (-55°C to 125°C)
- Control voltage pin (CONT) to alter trigger and threshold levels
- Reset input (RESET) to override all other inputs and initiate a new timing cycle
Applications
- Pulse generation and timing in digital circuits
- Time-delay circuits in monostable mode
- Oscillators in astable mode
- Alarm and timer circuits
- Military and aerospace applications due to its radiation tolerance and wide temperature range
Q & A
- What is the operating temperature range of the SE555D?
The operating temperature range of the SE555D is -55°C to 125°C.
- What are the supply voltage ranges for the SE555D?
The supply voltage range for the SE555D is 4.5V to 18V.
- Can the SE555D operate in both astable and monostable modes?
Yes, the SE555D can operate in both astable and monostable modes.
- What is the maximum output current of the SE555D?
The SE555D can sink or source up to 200 mA of current.
- Is the SE555D radiation tolerant?
Yes, the SE555D is rad-tolerant with a typical value of 25 kRad (Si) TID.
- How is the timed interval controlled in monostable mode?
In monostable mode, the timed interval is controlled by a single external resistor and capacitor network.
- What is the purpose of the control voltage pin (CONT) on the SE555D?
The control voltage pin (CONT) can be used to alter the trigger and threshold levels of the timer.
- What is the function of the reset input (RESET) on the SE555D?
The reset input (RESET) overrides all other inputs and is used to initiate a new timing cycle by resetting the flip-flop and setting the output low.
- Is the SE555D compatible with TTL inputs?
Yes, with a 5V supply, the output levels of the SE555D are compatible with TTL inputs.
- What is the current status of the SE555D in terms of production?
The SE555D is no longer in production.
