NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
www.ti.com
SLFS023G – APRIL 1978 – REVISED JUNE 2006
FEATURES
•
•
•
•
•
Two Precision Timing Circuits Per Package
Astable or Monostable Operation
TTL-Compatible Output Can Sink or Source
up to 150 mA
Active Pullup or Pulldown
Designed to Be Interchangeable With
Signetics NE556, SA556, and SE556
NA556...D OR N PACKAGE
NE556...D, N, OR NS PACKAGE
SA556...D OR N PACKAGE
SE556...J PACKAGE
(TOP VIEW)
APPLICATIONS
•
•
•
•
•
•
•
•
•
•
•
•
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
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
DESCRIPTION/ORDERING INFORMATION
These devices provide two independent timing circuits of the NA555, 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 normally are 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 RESET 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).
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1978–2006, 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.
NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G – APRIL 1978 – REVISED JUNE 2006
www.ti.com
ORDERING INFORMATION
T
A
V
T
(MAX)
V
CC
= 15 V
PDIP – N
0°C to 70°C
11.2 V
SOIC – D
SOP – NS
–40°C to 85°C
–40°C to 105°C
11.2 V
11.2 V
PDIP – N
PDIP – N
SOIC – D
CDIP – J
PACKAGE
(1)
Tube of 25
Tube of 50
Reel of 2500
Reel of 2000
Tube of 25
Tube of 25
Tube of 50
Reel of 2500
Tube of 25
ORDERABLE PART NUMBER
NE556N
NE556D
NE556DR
NE556NSR
SA556N
NA556N
NA556D
NA556DR
SE556J
SE556JB
TOP-SIDE MARKING
NE556N
NE556
NE556
SA556N
NA556N
NA556
SE556J
SE556JB
–55°C to 125°C
(1)
10.6 V
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
FUNCTION TABLE
(each timer)
RESET
Low
High
High
High
(1)
TRIGGER
VOLTAGE
(1)
Irrelevant
<1/3 V
DD
>1/3 V
DD
>1/3 V
DD
THRESHOLD
VOLTAGE
(1)
Irrelevant
Irrelevant
>2/3 V
DD
<2/3 V
DD
OUTPUT
Low
High
Low
DISCHARGE
SWITCH
On
Off
On
As previously established
Voltage levels shown are nominal.
FUNCTIONAL BLOCK DIAGRAM, EACH TIMER
V
CC
RESET
THRES
CONT
OUT
TRIG
DISCH
GND
RESET can override TRIG, which can override THRES.
2
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NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G – APRIL 1978 – REVISED JUNE 2006
Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN
V
CC
V
I
I
O
θ
JA
θ
JC
T
J
Supply voltage
(2)
Input voltage
Output current
D package
Package thermal impedance
(3) (4)
Package thermal impedance
(5) (6)
Operating virtual junction temperature
Lead temperature 1,6 mm (1/16 in) from case for 60 s
Lead temperature 1,6 mm (1/16 in) from case for 10 s
T
stg
(1)
(2)
(3)
(4)
(5)
(6)
Storage temperature range
J package
D, N, or NS package
–65
N package
NS package
J package
CONT, RESET, THRES, and TRIG
MAX
18
V
CC
±225
86
80
76
15.05
150
300
260
150
°C/W
°C
°C
°C
°C
°C/W
UNIT
V
V
mA
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.
All voltage values are with respect to network ground terminal.
Maximum power dissipation is a function of T
J
(max),
θ
JA
, and T
A
. The maximum allowable power dissipation at any allowable ambient
temperature is P
D
= (T
J
(max) – T
A
)/θ
JA
. Operating at the absolute maximum T
J
of 150°C can affect reliability.
The package thermal impedance is calculated in accordance with JESD 51-7.
Maximum power dissipation is a function of T
J
(max),
θ
JC
, and T
C
. The maximum allowable power dissipation at any allowable case
temperature is P
D
= (T
J
(max) – T
C
)/θ
JC
. Operating at the absolute maximum T
J
of 150°C can affect reliability.
The package thermal impedance is calculated in accordance with MIL-STD-883.
Recommended Operating Conditions
MIN
V
CC
V
I
I
O
Supply voltage
Input voltage
Output current
NA556
T
A
Operating free-air temperature
NE556
SA556
SE556
–40
0
–40
–55
NA556, NE556, SA556
SE556
CONT, RESET, THRES, and TRIG
4.5
4.5
MAX
16
18
V
CC
±200
105
70
85
125
°C
UNIT
V
V
mA
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NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G – APRIL 1978 – REVISED JUNE 2006
www.ti.com
Electrical Characteristics
V
CC
= 5 V to 15 V, T
A
= 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
V
T
I
T
Threshold voltage
level
Threshold current
(1)
V
CC
= 15 V
V
TRIG
Trigger voltage level
V
CC
= 5 V
I
TRIG
V
RESET
I
RESET
I
DISCH
Trigger current
Reset voltage level
Reset current
Discharge switch
off-state current
V
CC
= 15 V
V
CC
= 5 V
V
CC
= 15 V,
I
OL
= 10 mA
V
CC
= 15 V,
I
OL
= 50 mA
Low-level
output voltage
V
CC
= 15 V,
I
OL
= 100 mA
V
CC
= 5 V,
I
OL
= 3.5 mA
V
CC
= 5 V,
I
OL
= 5 mA
9
T
A
= –55°C to 125°C
2.6
T
A
= –55°C to 125°C
0.1
T
A
= –55°C to 125°C
0.4
T
A
= –55°C to 125°C
2
T
A
= –55°C to 125°C
2.5
2.5
0.35
0.1
T
A
= –55°C to 125°C
0.15
12.75
T
A
= –55°C to 125°C
12.5
2.75
T
A
= –55°C to 125°C
V
CC
= 15 V
V
CC
= 5 V
V
CC
= 15 V
V
CC
= 5 V
20
6
18
4
30
12
26
10
3.3
3
2
20
6
18
4
24
10
20
8
mA
13.3
0.3
13
12
12.5
3.3
V
0.15
13.3
0.25
0.1
0.15
0.8
0.25
2.5
2
0.75
0.4
0.25
3.3
4
TRIG at 0 V
0.3
T
A
= –55°C to 125°C
RESET at V
CC
RESET at 0 V
0.1
–0.4
20
10
0.4
1.5
100
11
9.6
9.6
2.9
2.9
0.1
3.3
0.1
–0.4
20
10
4.5
T
A
= –55°C to 125°C
1.1
T
A
= –55°C to 125°C
0.5
0.7
2
1
0.3
0.5
0.7
1.67
2.2
V
CC
= 15 V
V
CC
= 5 V
8.8
2.4
NA556
NE556
SA556
TYP
10
3.3
30
5
MAX
11.2
4.2
250
5.6
4.8
3
1.45
1.67
MIN
9.4
2.7
SE556
TYP
10
3.3
30
5
MAX
10.6
4
250
5.2
6
1.9
1.9
0.9
1
1.1
0.4
–1
100
10.4
10.4
3.8
3.8
0.15
0.2
0.5
1
2.2
2.7
V
V
µA
V
mA
nA
V
V
nA
UNIT
V
CONT
Control voltage
(open circuit)
V
OL
V
CC
= 15 V, I
OL
= 200 mA
T
A
= –55°C to 125°C
V
CC
= 5 V, I
OL
= 8 mA
V
CC
= 15 V,
I
OH
= –100 mA
V
OH
High-level
output voltage
V
CC
= 15 V, I
OH
= –200 mA
V
CC
= 5 V,
I
OH
= –100 mA
Output low,
No load
I
CC
Supply current
Output high,
No load
(1)
This parameter influences the maximum value of the timing resistors R and R
B
in the circuit of
Figure 1.
For example, when V
CC
= 5 V,
the maximum value is R = R
A
+ R
B
≈
3.4 MΩ, and for V
CC
= 15 V, the maximum value is
≈
10 MΩ.
4
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NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G – APRIL 1978 – REVISED JUNE 2006
Operating Characteristics
V
CC
= 5 V and 15 V
PARAMETER
TEST
CONDITIONS
(1)
MIN
Initial error of timing
interval
(2)
Each timer,
monostable
(3)
Each timer, astable
(5)
Timer 1 – Timer 2
Temperature
coefficient of timing
interval
Each timer,
monostable
(3)
Each timer, astable
(5)
Timer 1 – Timer 2
Supply voltage
sensitivity of timing
interval
Output-pulse rise time
Output-pulse fall time
(1)
(2)
(3)
(4)
(5)
Each timer,
monostable
(3)
Each timer, astable
(5)
Timer 1 – Timer 2
C
L
= 15 pF,
T
A
= 25°C
C
L
= 15 pF,
T
A
= 25°C
T
A
= 25°C
T
A
= MIN to MAX
T
A
= 25°C
NA556
NE556
SA556
TYP
1
2.25%
±1
50
150
±10
0.1
0.3
±0.2
100
100
300
300
0.5
MAX
3
MIN
SE556
TYP
0.5
1.5%
±0.5
30
90
±10
0.05
0.15
±0.1
100
100
200
(4)
200
(4)
ns
ns
0.2
(4)
%/V
100
(4)
ppm/°C
MAX
1.5
(4)
UNIT
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 the following component values: R
A
= 2 kΩ to 100 kΩ,
C = 0.1
µF.
On products compliant to MIL-PRF-38535, this parameter is not production tested.
Values specified are for a device in an astable circuit similar to
Figure 1,
with the following component values: R
A
= 1 kΩ to 100 kΩ,
C = 0.1
µF.
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