NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023C – APRIL 1978 – REVISED DECEMBER 1999
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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-T one Encoders
description
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
PACKAGED DEVICES
V
T
(MAX)
T
A
VCC = 15 V
SMALL OUTLINE
CERAMIC DIP
PLASTIC DIP
(D)
(J)
(N)
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).
Copyright 1999, 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.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1DISCH
1THRES
1CONT
1RESET
1OUT
1TRIG
GND
V
CC
2DISCH
2THRES
2CONT
2RESET
2OUT
2TRIG
NE556, SA556 . . . D, OR N PACKAGE
SE556 ...J PACKAGE
(TOP VIEW)
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.
NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023C – APRIL 1978 – REVISED DECEMBER 1999
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FUNCTION TABLE
(each timer)
RESET
TRIGGER VOLTAGE†THRESHOLD VOLTAGE†OUTPUT DISCHARGE SWITCH
Low Irrelevant Irrelevant Low On
High < 1/3 V
DD
Irrelevant High Off
High > 1/3 V
DD
> 2/3 V
DD
Low On
High > 1/3 V
DD
> 2/3 V
DD
As previously established
†
Voltage levels shown are nominal.
functional block diagram, each timer
R1
RS1
OUT
RESETV
CC
CONT
R
R
R
GND
DISCH
THRES
TRIG
RESET can override TRIG, which can override THRES.
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
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output current ±225 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Note 2): D package 86°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package 80°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
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
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.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
TA = 125°C
POWER RATING
J 1375 mW 11.0 mW/°C 880 mW 715 mW 275 mW
NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023C – APRIL 1978 – REVISED DECEMBER 1999
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
MIN MAX UNIT
pp
NE556, SA556 4.5 16
Suppl
y v
oltage, V
CC
SE556 4.5 18
V
Input voltage (CONT, RESET, THRES, and TRIG), V
I
V
CC
V
Output current, I
O
±200 mA
NE556 0 70
Operating free-air temperature, T
A
SA556 –40 85
°C
SE556 –55 125
electrical characteristics, V
CC
= 5 V to 15 V, TA = 25°C (unless otherwise noted)
NE556, SA556 SE556
PARAMETER
TEST CONDITIONS
MIN TYP MAX MIN TYP MAX
UNIT
VCC = 15 V 8.8 10 11.2 9.4 10 10.6
VTThreshold voltage level
VCC = 5 V 2.4 3.3 4.2 2.7 3.3 4
V
I
T
Threshold current (see Note 3) 30 250 30 250 nA
VCC = 15 V 4.5 5 5.6 4.8 5 5.2
V
TRIG
Trigger voltage level
VCC = 5 V 1.1 1.67 2.2 1.45 1.67 1.9
V
I
TRIG
Trigger current TRIG at 0 V 0.5 2 0.5 0.9 µA
V
RESET
Reset voltage level 0.3 0.7 1 0.3 0.7 1 V
RESET at V
CC
0.1 0.4 0.1 0.4
I
RESET
Reset current
RESET at 0 V –0.4 1.5 –0.4 –1
mA
I
DISCH
Discharge switch off-state
current
20 100 20 100 nA
p
VCC = 15 V 9 10 11 9.6 10 10.4
V
CONT
Control voltage (open circuit)
VCC = 5 V 2.6 3.3 4 2.9 3.3 3.8
V
IOL = 10 mA 0.1 0.25 0.1 0.15
IOL = 50 mA 0.4 0.75 0.4 0.5
p
V
CC
= 15
V
IOL = 100 mA 2 2.5 2 2.2
VOLLow-level output voltage
IOL = 200 mA 2.5 2.5
V
IOL = 5 mA 0.1 0.25 0.1 0.15
V
CC
= 5
V
IOL = 8 mA 0.15 0.3 0.15 0.25
IOH = –100 mA 12.75 13.3 13 13.3
V
OH
High-level output voltage
V
CC
=
15 V
IOH = –200 mA 12.5 12.5
V
VCC = 5 V IOH = –100 mA 2.75 3.3 3 3.3
Output low,
VCC = 15 V 20 30 20 24
pp
,
No Load
VCC = 5 V 6 12 6 10
mA
ICCSupply current
Output high,
VCC = 15 V 18 26 18 20
g
No load
VCC = 5 V 4 10 4 8
nA
NOTE 3: This parameter influences the maximum value of the timing resistors RA and RB in the circuit of Figure 1. For example, when
VCC = 5 V, the maximum value is R = RA + RB ≈ 3.4 MΩ, and for VCC = 15 V , the maximum value is ≈ 10 MΩ.
NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023C – APRIL 1978 – REVISED DECEMBER 1999
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
operating characteristics, VCC = 5 V and 15 V
TEST
NE556, SA556 SE556
PARAMETER
CONDITIONS
†
MIN TYP MAX MIN TYP MAX
UNIT
Each timer, monostable
§
1 3 0.5 1.5
Initial error of timing interval
‡
Each timer, astable
¶
TA = 25°C
2.25% 1.5%
g
Timer 1 — Timer 2 ±1 ±0.5
Each timer, monostable
§
50 30 100
T emperature coef ficient of
Each timer, astable
¶
TA = MIN to MAX
150 90
ppm/°C
timing interval
Timer 1 — Timer 2 ±10 ±10
Each timer, monostable
§
0.1 0.5 0.05 0.2
Supply voltage sensitivity of
Each timer, astable
¶
TA = 25°C
0.3 0.15
%/V
timing interval
Timer 1 — Timer 2 ±0.2 ±0.1
Output pulse rise time
CL = 15 pF,
100 300 100 200
Output pulse fall time
L
TA = 25°C
100 300 100 200
ns
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡
Timing interval error is defined as the difference between the measured value and the average value of a random sample from each process
run.
§
Values specified are for a device in a monostable circuit similar to Figure 2, with component values as follow: RA = 2 kΩ to 100 kΩ, C = 0.1µF.
¶
Values specified are for a device in an astable circuit similar to Figure 1, with component values as follow: RA = 1 kΩ to 100 kΩ, C = 0.1µF.
APPLICATION INFORMATION
R
B
C
R
A
Open
(see Note A)
R
L
OUT
V
CC
(5 V to 15 V)
V
CC
CONT
RESET
DISCH
THRES
TRIG
GND
OUT
NOTE A: Bypassing the control-voltage input to ground with
a capacitor may improve operation. This should be
evaluated for individual applications.
Figure 1. Circuit for Astable Operation
R
A
R
L
OUT
V
CC
(5 V to 15 V)
V
CC
CONT
RESET
DISCH
THRES
TRIG
GND
OUT
INPUT
0.01 µF
Figure 2. Circuit for Monostable Operation
C
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TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
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Copyright 1999, Texas Instruments Incorporated
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