R1

R

S

1

THRES

R

R

R

TRIG

2

1

GND

DISCH

7

3

OUT

6

VDD

8

5

CONT

RESET

4

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Design

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

TLC555

SLFS043I – SEPTEMBER 1983 – REVISED JULY 2019

TLC555 LinCMOS™ Timer

1

1 Features

1

•

Very low power consumption:

–

•

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 flip-

flop 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.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

TLC555C

SOIC (8)

4.90 mm × 3.91 mm

PDIP (8)

9.81 mm × 6.38 mm

SOP (8)

6.20 mm × 5.30 mm

TSSOP (14)

5.00 mm × 4.40 mm

TLC555I

SOIC (8)

4.90 mm × 3.91 mm

PDIP (8)

9.81 mm × 6.38 mm

TLC555M

LCCC (20)

8.89 mm × 8.89 mm

CDIP (8)

9.60 mm × 6.67 mm

TLC555Q

SOIC (8)

4.90 mm × 3.91 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Schematic