TEXAS INSTRUMENTS NE556, SA556, SE556 Technical data

V

(MAX)

T

A

SMALL OUTLINE

CERAMIC DIP

PLASTIC DIP

(D)

(J)

(N)

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NE556, SA556, SE556

DUAL PRECISION TIMERS

SLFS023C – APRIL 1978 – REVISED DECEMBER 1999

D

Two Precision Timing Circuits per Package

D

Astable or Monostable Operation

D

TTL-Compatible Output Can Sink or Source
Up to 150 mA

D

Active Pullup or Pulldown

D

Designed to be Interchangeable With
Signetics NE556, SA556, and SE556

D

Applications Include:
– Precision Timers From Microseconds to

Hours
– Pulse-Shaping CIrcuits
– Missing-Pulse Detectors
– Tone-Burst Generators
– Pulse-Width Modulators
– Pulse-Position Modulators
– Sequential Timers
– Pulse Generators
– Frequency Dividers
– Application Timers
– Industrial Controls
– Touch-Tone Encoders

description

NE556, SA556 . . . D, OR N PACKAGE

SE556 ...J PACKAGE

(TOP VIEW)

1DISCH

1THRES

1CONT

1RESET

1OUT

1TRIG

GND

1
2
3
4
5
6
7

14
13
12
11
10

9
8

V

CC

2DISCH
2THRES
2CONT
2RESET
2OUT
2TRIG

These devices provide two independent timing circuits of the NE555, SA555, or SE555 type in each package.
These circuits can be operated in the astable or the monostable mode with external resistor-capacitor (RC)
timing control. The basic timing provided by the RC time constant can be controlled actively by modulating the
bias of the control-voltage input.

The threshold (THRES) and trigger (TRIG) levels are normally two-thirds and one-third, respectively , of V

CC

These levels can be altered by using the control-voltage (CONT) terminal. When the trigger input falls below
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 (RESET) input
can override all other inputs and can be used to initiate a new timing cycle. When the reset input goes low, the
flip-flop is reset and the output goes low. When the output is low, a low-impedance path is provided between
the discharge (DISCH) terminal and ground (GND).

The NE556 is characterized for operation from 0°C to 70°C. The SA556 is characterized for operation from
–40°C to 85°C, and the SE556 is characterized for operation over the full military range of –55°C to 125°C.

AVAILABLE OPTIONS

T

VCC = 15 V

0°C to 70°C 11.2 V NE556D – NE556N

–40°C to 85°C 11.2 V SA556D – SA556N

–55°C to 125°C 10.6 V – SE556J –

The D package is available taped and reeled. Add the suffix R to the device type (e.g., NE556DR).

PACKAGED DEVICES

.

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1999, Texas Instruments Incorporated

On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.

1

NE556, SA556, SE556
DUAL PRECISION TIMERS

SLFS023C – APRIL 1978 – REVISED DECEMBER 1999

RESET

Low Irrelevant Irrelevant Low On
High < 1/3 V
High > 1/3 V
High > 1/3 V

†

Voltage levels shown are nominal.

functional block diagram, each timer

TRIGGER VOLTAGE†THRESHOLD VOLTAGE†OUTPUT DISCHARGE SWITCH

DD
DD
DD

FUNCTION TABLE

(each timer)

Irrelevant High Off
> 2/3 V
> 2/3 V

DD
DD

Low On

As previously established

CC

R

THRES

CONT

R

TRIG

R

GND

RESET can override TRIG, which can override THRES.

RESETV

R1
RS1

OUT

DISCH

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, VCC (see Note 1) 18 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage (CONT, RESET, THRES, and TRIG) V

Output current ±225 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θJA (see Note 2): D package 86°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package 300°C. . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or N package 260°C. . . . . . . . . . . . . . . .

Storage temperature range, T

‡

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. All voltage values are with respect to network ground terminal.

2. The package thermal impedance is calculated in accordance with JESD 51.

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 80°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡

CC

DISSIPATION RATING TABLE

PACKAGE

J 1375 mW 11.0 mW/°C 880 mW 715 mW 275 mW

2

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

TA = 125°C

POWER RATING