Overview
The TLC556CDR, 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 fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2 MHz. The TLC556CDR is known for its low power consumption, high output-current capability, and the ability to operate in astable mode. It is functionally interchangeable with the NE556 and has the same pinout, making it a versatile component for various timing applications.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VDD) | 2 | 15 | V | ||
| Input Threshold Voltage (VIT) | VDD = 5V, 25°C | 2.8 | 3.3 | 3.8 | V |
| Trigger Voltage (V(TRIG)) | VDD = 5V, 25°C | 1.36 | 1.66 | 1.96 | V |
| Reset Voltage (V(RESET)) | VDD = 5V, 25°C | 0.4 | 1.1 | 1.5 | V |
| High-Level Output Voltage (VOH) | IOH = –300μA, VDD = 5V, 25°C | 1.5 | 1.9 | V | |
| Low-Level Output Voltage (VOL) | IOL = 1mA, VDD = 5V, 25°C | 0.07 | 0.3 | V | |
| Supply Current (IDD) | VDD = 5V, 25°C | 360 | 700 | 1000 | μA |
| Output Rise Time (tr) | RL = 10kΩ, CL = 10pF, VDD = 5V, 25°C | 20 | 75 | ns |
Key Features
- Very low power consumption: 2mW typical at VDD = 5V
- Capable of operation in astable mode
- CMOS output capable of swinging rail to rail
- High output-current capability: Sink 100mA typical, Source 10mA typical
- Output fully compatible with CMOS, TTL, and MOS logic
- Low supply current reduces spikes during output transitions
- Single-supply operation from 2V to 15V
- Functionally interchangeable with the NE556; has same pinout
Applications
- Precision timing
- Pulse generation
- Sequential timing
- Time delay generation
- Pulse width modulation
- Pulse position modulation
- Linear ramp generator
Q & A
- What is the operating voltage range of the TLC556CDR? The TLC556CDR operates from a single supply voltage ranging from 2V to 15V.
- What is the maximum output current capability of the TLC556CDR? The TLC556CDR can sink up to 100mA and source up to 10mA.
- Is the TLC556CDR compatible with other logic types? Yes, the TLC556CDR is fully compatible with CMOS, TTL, and MOS logic.
- What are the typical applications of the TLC556CDR? Typical applications include precision timing, pulse generation, sequential timing, time delay generation, pulse width modulation, pulse position modulation, and linear ramp generation.
- How does the reset input function on the TLC556CDR? The reset input (RESET) overrides all other inputs and can be used to initiate a new timing cycle. If RESET is low, the flip-flop is reset and the output is low.
- What is the significance of the control voltage pin (CONT) on the TLC556CDR? The control voltage pin (CONT) can be used to alter the trigger and threshold levels. It is typically set to 2/3 of the supply voltage.
- How does the TLC556CDR handle ESD protection? The TLC556CDR has internal HBM and CDM protection, but additional protection using bypass capacitors, current-limiting resistors, and voltage-clamping TVS diodes is recommended for exposed pins.
- What are the temperature ranges for different versions of the TLC556? The TLC556C is characterized for operation from 0°C to 70°C, the TLC556I from –40°C to +85°C, and the TLC556M from –55°C to +125°C.
- Can the TLC556CDR be used in astable mode? Yes, the TLC556CDR is capable of operation in astable mode.
- How does the TLC556CDR reduce supply current spikes? The TLC556CDR exhibits greatly reduced supply-current spikes during output transitions, minimizing the need for large decoupling capacitors.
