TLC555

LinCMOS TIMER

SLFS043F − SEPTEMBER 1983 − REVISED FEBRUARY 2005

1

POST OFFICE BOX 655303

to Rail

− Sink 100 mA Typ

− Source 10 mA Typ

and MOS

During Output Transitions

NE555; Has Same Pinout

MIL-STD-883C, Method 3015.2

High Reliability Automotive Applications

Configuration Control/Print Support

Qualification to Automotive Standards

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 uses smaller timing capacitors than those

used by the NE555. 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 should be tied to an appropriate logic level to prevent false triggering.

While the CMOS output is capable of sinking over 100 mA and sourcing over 10 mA, the TLC555 exhibits greatly

reduced supply-current spikes during output transitions. This minimizes the need for the large decoupling

capacitors required by the NE555.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Copyright

 1983−2005, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

LinCMOS is a trademark of Texas Instruments.

32

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

NC

DISCH

NC

THRES

NC

NC

TRIG

NC

OUT

NC

FK PACKAGE

(TOP VIEW)

D, DB, JG, OR P PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

GND

TRIG

OUT

RESET

DISCH

THRES

CONT

NC − No internal connection

1

2

3

4

5

6

7

14

13

12

11

10

9

8

GND

NC

TRIG

NC

OUT

NC

RESET

NC

DISCH

NC

THRES

NC

CONT

PW PACKAGE

(TOP VIEW)

On products compliant to MILPRF38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.