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FEATURES
APPLICATIONS
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
NA556...D OR N PACKAGE
NE556...D, N, OR NS PACKAGE
SA556...D OR N PACKAGE
SE556...J PACKAGE
(TOP VIEW)
DESCRIPTION/ORDERING INFORMATION
NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G APRIL 1978 REVISED JUNE 2006
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
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
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.
Copyright 19782006, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
On products compliant to MIL-PRF-38535, all parameters are
Instruments standard warranty. Production processing does not
tested unless otherwise noted. On all other products, production
necessarily include testing of all parameters.
processing does not necessarily include testing of all parameters.
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OUT
RESET
V
CC
CONT
GND
DISCH
THRES
TRIG
RESET can override TRIG, which can override THRES.
NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G APRIL 1978 REVISED JUNE 2006
ORDERING INFORMATION
V
T
(MAX)
T
A
PACKAGE
(1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
V
CC
= 15 V
PDIP N
Tube of 25
NE556N
NE556N
Tube of 50
NE556D
0
C to 70
C
11.2 V
SOIC D
NE556
Reel of 2500
NE556DR
SOP NS
Reel of 2000
NE556NSR
NE556
40
C to 85
C
11.2 V
PDIP N
Tube of 25
SA556N
SA556N
PDIP N
Tube of 25
NA556N
NA556N
40
C to 105
C
11.2 V
Tube of 50
NA556D
SOIC D
NA556
Reel of 2500
NA556DR
SE556J
SE556J
55
C to 125
C
10.6 V
CDIP J
Tube of 25
SE556JB
SE556JB
(1)
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
FUNCTION TABLE
(each timer)
TRIGGER
THRESHOLD
DISCHARGE
RESET
OUTPUT
VOLTAGE
(1)
VOLTAGE
(1)
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
(1)
Voltage levels shown are nominal.
FUNCTIONAL BLOCK DIAGRAM, EACH TIMER
2
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Absolute Maximum Ratings
(1)
Recommended Operating Conditions
NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G APRIL 1978 REVISED JUNE 2006
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
UNIT
V
CC
Supply voltage
(2)
18
V
V
I
Input voltage
CONT, RESET, THRES, and TRIG
V
CC
V
I
O
Output current
225
mA
D package
86
JA
Package thermal impedance
(3) (4)
N package
80
C/W
NS package
76
JC
Package thermal impedance
(5) (6)
J package
15.05
C/W
T
J
Operating virtual junction temperature
150
C
Lead temperature 1,6 mm (1/16 in) from case for 60 s
J package
300
C
Lead temperature 1,6 mm (1/16 in) from case for 10 s
D, N, or NS package
260
C
T
stg
Storage temperature range
65
150
C
(1)
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.
(2)
All voltage values are with respect to network ground terminal.
(3)
Maximum power dissipation is a function of T
J
(max),
JA
, and T
A
. The maximum allowable power dissipation at any allowable ambient
temperature is P
D
= (T
J
(max) T
A
)/
JA
. Operating at the absolute maximum T
J
of 150
C can affect reliability.
(4)
The package thermal impedance is calculated in accordance with JESD 51-7.
(5)
Maximum power dissipation is a function of T
J
(max),
JC
, and T
C
. The maximum allowable power dissipation at any allowable case
temperature is P
D
= (T
J
(max) T
C
)/
JC
. Operating at the absolute maximum T
J
of 150
C can affect reliability.
(6)
The package thermal impedance is calculated in accordance with MIL-STD-883.
MIN
MAX
UNIT
NA556, NE556, SA556
4.5
16
V
CC
Supply voltage
V
SE556
4.5
18
V
I
Input voltage
CONT, RESET, THRES, and TRIG
V
CC
V
I
O
Output current
200
mA
NA556
40
105
NE556
0
70
T
A
Operating free-air temperature
C
SA556
40
85
SE556
55
125
3
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Electrical Characteristics
NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G APRIL 1978 REVISED JUNE 2006
V
CC
= 5 V to 15 V, T
A
= 25
C (unless otherwise noted)
NA556
NE556
SE556
PARAMETER
TEST CONDITIONS
UNIT
SA556
MIN
TYP
MAX
MIN
TYP
MAX
V
CC
= 15 V
8.8
10
11.2
9.4
10
10.6
Threshold voltage
V
T
V
level
V
CC
= 5 V
2.4
3.3
4.2
2.7
3.3
4
I
T
Threshold current
(1)
30
250
30
250
nA
4.5
5
5.6
4.8
5
5.2
V
CC
= 15 V
T
A
= 55
C to 125
C
3
6
V
TRIG
Trigger voltage level
V
1.1
1.67
2.2
1.45
1.67
1.9
V
CC
= 5 V
T
A
= 55
C to 125
C
1.9
I
TRIG
Trigger current
TRIG at 0 V
0.5
2
0.5
0.9
A
0.3
0.7
1
0.3
0.7
1
V
RESET
Reset voltage level
V
T
A
= 55
C to 125
C
1.1
RESET at V
CC
0.1
0.4
0.1
0.4
I
RESET
Reset current
mA
RESET at 0 V
0.4
1.5
0.4
1
Discharge switch
I
DISCH
20
100
20
100
nA
off-state current
9
10
11
9.6
10
10.4
V
CC
= 15 V
T
A
= 55
C to 125
C
9.6
10.4
Control voltage
V
CONT
V
(open circuit)
2.6
3.3
4
2.9
3.3
3.8
V
CC
= 5 V
T
A
= 55
C to 125
C
2.9
3.8
0.1
0.25
0.1
0.15
V
CC
= 15 V,
I
OL
= 10 mA
T
A
= 55
C to 125
C
0.2
0.4
0.75
0.4
0.5
V
CC
= 15 V,
I
OL
= 50 mA
T
A
= 55
C to 125
C
1
2
2.5
2
2.2
V
CC
= 15 V,
I
OL
= 100 mA
Low-level
T
A
= 55
C to 125
C
2.7
V
OL
V
output voltage
V
CC
= 15 V, I
OL
= 200 mA
2.5
2.5
V
CC
= 5 V,
T
A
= 55
C to 125
C
0.35
I
OL
= 3.5 mA
0.1
0.25
0.1
0.15
V
CC
= 5 V,
I
OL
= 5 mA
T
A
= 55
C to 125
C
0.8
V
CC
= 5 V, I
OL
= 8 mA
0.15
0.3
0.15
0.25
12.75
13.3
13
13.3
V
CC
= 15 V,
I
OH
= 100 mA
T
A
= 55
C to 125
C
12
High-level
V
OH
V
CC
= 15 V, I
OH
= 200 mA
12.5
12.5
V
output voltage
2.75
3.3
3
3.3
V
CC
= 5 V,
I
OH
= 100 mA
T
A
= 55
C to 125
C
2
V
CC
= 15 V
20
30
20
24
Output low,
No load
V
CC
= 5 V
6
12
6
10
I
CC
Supply current
mA
V
CC
= 15 V
18
26
18
20
Output high,
No load
V
CC
= 5 V
4
10
4
8
(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 M
, and for V
CC
= 15 V, the maximum value is
10 M
.
4
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Operating Characteristics
NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G APRIL 1978 REVISED JUNE 2006
V
CC
= 5 V and 15 V
NA556
NE556
SE556
TEST
PARAMETER
UNIT
SA556
CONDITIONS
(1)
MIN
TYP
MAX
MIN
TYP
MAX
Each timer,
1
3
0.5
1.5
(4)
monostable
(3)
Initial error of timing
T
A
= 25
C
interval
(2)
Each timer, astable
(5)
2.25%
1.5%
Timer 1 Timer 2
1
0.5
Each timer,
50
30
100
(4)
Temperature
monostable
(3)
coefficient of timing
T
A
= MIN to MAX
ppm/
C
Each timer, astable
(5)
150
90
interval
Timer 1 Timer 2
10
10
Each timer,
0.1
0.5
0.05
0.2
(4)
Supply voltage
monostable
(3)
sensitivity of timing
T
A
= 25
C
%/V
Each timer, astable
(5)
0.3
0.15
interval
Timer 1 Timer 2
0.2
0.1
C
L
= 15 pF,
Output-pulse rise time
100
300
100
200
(4)
ns
T
A
= 25
C
C
L
= 15 pF,
Output-pulse fall time
100
300
100
200
(4)
ns
T
A
= 25
C
(1)
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
(2)
Timing-interval error is defined as the difference between the measured value and the average value of a random sample from each
process run.
(3)
Values specified are for a device in a monostable circuit similar to
Figure 2
, with the following component values: R
A
= 2 k
to 100 k
,
C = 0.1
F.
(4)
On products compliant to MIL-PRF-38535, this parameter is not production tested.
(5)
Values specified are for a device in an astable circuit similar to
Figure 1
, with the following component values: R
A
= 1 k
to 100 k
,
C = 0.1
F.
5
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APPLICATION INFORMATION
R
A
R
L
OUT
V
CC
(5 V to 15 V)
V
CC
CONT
RESET
DISCH
THRES
TRIG
GND
OUT
Input
0.01 F
C
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 might improve operation. This should be evaluated
for individual applications.
NA556, NE556, SA556, SE556
DUAL PRECISION TIMERS
SLFS023G APRIL 1978 REVISED JUNE 2006
Figure 1. Circuit for Astable Operation
Figure 2. Circuit for Monostable Operation
6
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PACKAGING INFORMATION
Orderable Device
Status
(1)
Package
Type
Package
Drawing
Pins Package
Qty
Eco Plan
(2)
Lead/Ball Finish
MSL Peak Temp
(3)
JM38510/10902BCA
ACTIVE
CDIP
J
14
1
TBD
A42 SNPB
N / A for Pkg Type
NA556D
ACTIVE
SOIC
D
14
50
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NA556DG4
ACTIVE
SOIC
D
14
50
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NA556DR
ACTIVE
SOIC
D
14
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NA556DRG4
ACTIVE
SOIC
D
14
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NA556N
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
NA556NE4
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
NE556D
ACTIVE
SOIC
D
14
50
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NE556DBR
ACTIVE
SSOP
DB
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NE556DBRE4
ACTIVE
SSOP
DB
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NE556DE4
ACTIVE
SOIC
D
14
50
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NE556DR
ACTIVE
SOIC
D
14
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NE556DRE4
ACTIVE
SOIC
D
14
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NE556N
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
NE556NE4
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
NE556NSR
ACTIVE
SO
NS
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
NE556NSRE4
ACTIVE
SO
NS
14
2000 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
SA556D
OBSOLETE
SOIC
D
14
TBD
Call TI
Call TI
SA556DR
OBSOLETE
SOIC
D
14
TBD
Call TI
Call TI
SA556N
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
SA556NE4
ACTIVE
PDIP
N
14
25
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
SE556FKB
OBSOLETE
LCCC
FK
20
TBD
Call TI
Call TI
SE556J
ACTIVE
CDIP
J
14
1
TBD
A42 SNPB
N / A for Pkg Type
SE556JB
ACTIVE
CDIP
J
14
1
TBD
A42 SNPB
N / A for Pkg Type
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
PACKAGE OPTION ADDENDUM
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31-Jul-2006
Addendum-Page 1
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent
for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com
31-Jul-2006
Addendum-Page 2
MECHANICAL DATA
MLCC006B OCTOBER 1996
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FK (S-CQCC-N**)
LEADLESS CERAMIC CHIP CARRIER
4040140 / D 10/96
28 TERMINAL SHOWN
B
0.358
(9,09)
MAX
(11,63)
0.560
(14,22)
0.560
0.458
0.858
(21,8)
1.063
(27,0)
(14,22)
A
NO. OF
MIN
MAX
0.358
0.660
0.761
0.458
0.342
(8,69)
MIN
(11,23)
(16,26)
0.640
0.739
0.442
(9,09)
(11,63)
(16,76)
0.962
1.165
(23,83)
0.938
(28,99)
1.141
(24,43)
(29,59)
(19,32)
(18,78)
**
20
28
52
44
68
84
0.020 (0,51)
TERMINALS
0.080 (2,03)
0.064 (1,63)
(7,80)
0.307
(10,31)
0.406
(12,58)
0.495
(12,58)
0.495
(21,6)
0.850
(26,6)
1.047
0.045 (1,14)
0.045 (1,14)
0.035 (0,89)
0.035 (0,89)
0.010 (0,25)
12
13
14
15
16
18
17
11
10
8
9
7
5
4
3
2
0.020 (0,51)
0.010 (0,25)
6
1
28
26
27
19
21
B SQ
A SQ
22
23
24
25
20
0.055 (1,40)
0.045 (1,14)
0.028 (0,71)
0.022 (0,54)
0.050 (1,27)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a metal lid.
D. The terminals are gold plated.
E. Falls within JEDEC MS-004
MECHANICAL DATA
MSSO002E JANUARY 1995 REVISED DECEMBER 2001
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
DB (R-PDSO-G**)
PLASTIC SMALL-OUTLINE
4040065 /E 12/01
28 PINS SHOWN
Gage Plane
8,20
7,40
0,55
0,95
0,25
38
12,90
12,30
28
10,50
24
8,50
Seating Plane
9,90
7,90
30
10,50
9,90
0,38
5,60
5,00
15
0,22
14
A
28
1
20
16
6,50
6,50
14
0,05 MIN
5,90
5,90
DIM
A MAX
A MIN
PINS **
2,00 MAX
6,90
7,50
0,65
M
0,15
0
8
0,10
0,09
0,25
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-150
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI's terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI's standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
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amplifier.ti.com
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www.ti.com/audio
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dataconverter.ti.com
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www.ti.com/automotive
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dsp.ti.com
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www.ti.com/broadband
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interface.ti.com
Digital Control
www.ti.com/digitalcontrol
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logic.ti.com
Military
www.ti.com/military
Power Mgmt
power.ti.com
Optical Networking
www.ti.com/opticalnetwork
Microcontrollers
microcontroller.ti.com
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www.ti.com/telephony
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www.ti.com/video
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