Overview
The TLC556CDRG4, produced by Texas Instruments, is a dual LinCMOS™ timer integrated circuit. It is part of the TLC556 series, which are monolithic timing circuits fabricated using the TI LinCMOS™ process. This device is designed for general-purpose timing applications and operates at frequencies up to 2 MHz. The TLC556 is functionally interchangeable with the NE556 and has the same pinout, making it a versatile option for various timing needs. It is known for its low power consumption, high input impedance, and compatibility with CMOS, TTL, and MOS logic.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | 2 | 15 | V | ||
| Supply Current (VDD = 5V) | 25°C | 360 | 700 | 1000 | μA |
| Output Current (Sink) | 100 | mA | |||
| Output Current (Source) | 10 | mA | |||
| Trigger Voltage | 25°C | 1.36 | 1.66 | 1.96 | V |
| Threshold Voltage | 25°C | 2.8 | 3.3 | 3.8 | V |
| Output Rise Time (RL = 10kΩ, CL = 10pF) | 25°C | 20 | 75 | ns | |
| Operating Temperature | 0°C to 70°C (TLC556C) | −40°C to +85°C (TLC556I), −55°C to +125°C (TLC556M) | °C |
Key Features
- Very low power consumption: 2 mW typical at VDD = 5V
- Capable of operation in astable mode
- CMOS output capable of swinging rail to rail
- High output-current capability: Sink 100 mA typical, Source 10 mA typical
- Output fully compatible with CMOS, TTL, and MOS logic
- Low supply current reduces spikes during output transitions
- Single-supply operation from 2 V to 15 V
- Functionally interchangeable with the NE556; has the same pinout
- Internal electrostatic-discharge (ESD) protection circuits up to 2000 V
Applications
- Precision timing
- Pulse generation
- Sequential timing
- Time delay generation
- Pulse width modulation
- Pulse position modulation
- Linear ramp generator
Q & A
- What is the typical power consumption of the TLC556 at VDD = 5V?
The typical power consumption is 2 mW at VDD = 5V.
- What is the operating voltage range of the TLC556?
The TLC556 operates from a single supply voltage of 2 V to 15 V.
- What is the maximum output current sinking capability of the TLC556?
The TLC556 can sink up to 100 mA.
- Is the TLC556 compatible with other logic families?
Yes, the TLC556 is fully compatible with CMOS, TTL, and MOS logic.
- What are the trigger and threshold voltage levels for the TLC556?
The trigger level is approximately one-third of the supply voltage, and the threshold level is approximately two-thirds of the supply voltage.
- Can the TLC556 be used in astable mode?
Yes, the TLC556 is capable of operation in astable mode.
- What is the maximum operating frequency of the TLC556?
The TLC556 can operate at frequencies up to 2 MHz.
- Does the TLC556 have internal ESD protection?
Yes, the TLC556 has internal electrostatic-discharge (ESD) protection circuits up to 2000 V.
- What are the temperature ranges for different versions of the TLC556?
The TLC556C operates from 0°C to 70°C, the TLC556I from −40°C to +85°C, and the TLC556M from −55°C to +125°C.
- How does the reset input function on the TLC556?
The reset input overrides all other inputs and can be used to initiate a new timing cycle. If the reset input is low, the flip-flop is reset and the output is low.
