1 Features

1? Very low power consumption:

– 1-mW typical at VDD = 5 V

? 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

? Low supply current reduces spikes during output

transitions

? Single-supply operation from 2 V to 15 V

? Functionally interchangeable with the NE555; has

same pinout

? ESD protection exceeds 2000 V per MIL-STD-

883C, method 3015.2

? Available in Q-temp automotive

– High-reliability automotive applications

– Configuration control and print support

– Qualification to automotive standards

2 Applications

? Precision timing

? Pulse generation

? Sequential timing

? Time delay generation

? Pulse width modulation

? Pulse position modulation

? Linear ramp generator

3 Description

The TLC555 is a monolithic timing circuit fabricated

using the TI LinCMOS? process. The timer is fully

compatible with CMOS, TTL, and MOS logic and

operates at frequencies up to 2 MHz. Because of its

high input impedance, this device supports smaller

timing capacitors than those supported by the NE555

or LM555. As a result, more accurate time delays and

oscillations are possible. Power consumption is low

across the full range of power-supply voltage.

Like the NE555, the TLC555 has a trigger level equal

to approximately one-third of the supply voltage and a

threshold level equal to approximately two-thirds of

the supply voltage. These levels can be altered by

use of the control voltage terminal (CONT). When the

trigger input (TRIG) falls below the trigger level, the

flip-flop is set and the output goes high. If TRIG is

above the trigger level and the threshold input

(THRES) is above the threshold level, the flip-flop is

reset and the output is low. The reset input (RESET)

can override all other inputs and can be used to

initiate a new timing cycle. If RESET is low, the flipflop

is reset and the output is low. Whenever the

output is low, a low-impedance path is provided

between the discharge terminal (DISCH) and GND.

All unused inputs must be tied to an appropriate logic

level to prevent false triggering.