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See Technical Specifications

TLC556MDR +BOM

Low-power timers for energy-efficient applications

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

TLC556MDR
Datasheet:

TLC556MDR Datasheet (PDF)
Series:

LinCMOS™
Type:

555 Type, Timer/Oscillator (Dual)
Frequency:

2.1MHz
Voltage - Supply:

5V ~ 18V
EDA/CAD Models:

Request Free CAD Models for TLC556MDR

TLC556MDR General Description

The TLC556 series are monolithic timing circuits fabricated using the TI LinCMOS^TM process, which provides full compatibility with CMOS, TTL, and MOS logic and operates at frequencies up to 2MHz. Accurate time delays and oscillations are possible with smaller, less-expensive timing capacitors than the NE556 because of the high input impedance. Power consumption is low across the full range of power supply voltages.

Like the NE556, the TLC556 has a trigger level approximately one-third of the supply voltage and

a threshold level approximately two-thirds of the supply voltage. These levels can be altered by use of the control voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the output is low. The reset input can override 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. Whenever the output is low, a low-impedance path is provided between the discharge terminal and ground.

While the CMOS output is capable of sinking over 100 mA and sourcing over 10 mA, the TLC556 exhibits greatly reduced supply-current spikes during output transitions. This minimizes the need for the large decoupling capacitors required by the NE556.

These devices have internal electrostatic-discharge (ESD) protection circuits that prevent catastrophic failures at voltages up to 2000 V as tested under MIL-STD-883C, Method 3015. However, care should be exercised in handling these devices, as exposure to ESD may result in degradation of the device parametric performance.

All unused inputs should be tied to an appropriate logic level to prevent false triggering.

The TLC556C is characterized for operation from 0°C to 70°C. The TLC556I is characterized for operation from -40°C to 85°C. The TLC556M is characterized for operation over the full military temperature range of -55°C to 125°C

Key Features

Reduced Noise and EMI for Clear Signals
Improved Thermal Resistance for Cooling
Fast Recovery Time Reduces Tail Pulses
Low Quiescent Current for Efficient Operation
Wide Operating Temperature Range
Robustness Against Power Supply Noise

Specifications

Category	Integrated Circuits (ICs)Clock/TimingProgrammable Timers and Oscillators	Series	LinCMOS™
Type	555 Type, Timer/Oscillator (Dual)	Count	-
Frequency	2.1MHz	Voltage - Supply	5V ~ 18V
Current - Supply	720 µA	Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount	Base Product Number	TLC556