INTEGRATED CIRCUITS
NE/SA556
Dual timer
Product data
Replaces NE/SA/SE556/NE556-1 of 1994 Aug 31
IC11
2001 Aug 03
Philips
Semiconductors
Philips Semiconductors
Product data
Dual timer
NE/SA556
DESCRIPTION
Both the NE556 and SA556 Dual Monolithic timing circuits are highly
stable controllers capable of producing accurate time delays or
oscillation. The 556 is a dual 555. Timing is provided by an external
resistor and capacitor for each timing function. The two timers
operate independently of each other, sharing only V
CC
and ground.
The circuits may be triggered and reset on falling waveforms. The
output structures may sink or source 200 mA.
PIN CONFIGURATION
D, N Packages
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
RESET
OUTPUT
TRIGGER
FEATURES
•
Timing from microseconds to hours
•
Replaces two 555 timers
•
Operates in both astable and monostable modes
•
High output current
•
Adjustable duty cycle
•
TTL compatible
•
Temperature stability of 0.005%/°C
APPLICATIONS
SL00355
Figure 1. Pin Configuration
•
Precision timing
•
Sequential timing
•
Pulse shaping
•
Pulse generator
•
Missing pulse detector
•
Tone burst generator
•
Pulse width modulation
•
Time delay generator
•
Frequency division
•
Touch-Tone® encoder
•
Industrial controls
•
Pulse position modulation
•
Appliance timing
•
Traffic light control
ORDERING INFORMATION
DESCRIPTION
14-Pin Plastic Small Outline (SO) Package
14-Pin Plastic Dual In-Line Package (DIP)
14-Pin Plastic Dual In-Line Package (DIP)
TEMPERATURE RANGE
0 to +70°C
0 to +70°C
–40°C to +85°C
ORDER CODE
NE556D
NE556N
SA556N
DWG #
SOT108-1
SOT27-1
SOT27-1
®
Touch-Tone
is a registered trademark of AT&T.
2
853-0035 13721
2001 Aug 03
Philips Semiconductors
Product data
Dual timer
NE/SA556
BLOCK DIAGRAM
1
DISCHARGE
2
COMP
CONTROL VOLTAGE
RESET
3
4
COMP
11
10
RESET
CONTROL VOLTAGE
14
13
V
CC
DISCHARGE
THRESHOLD
12
THRESHOLD
FLIP FLOP
FLIP FLOP
OUTPUT
5
9
OUTPUT
TRIGGER
6
COMP
COMP
8
TRIGGER
GROUND
7
SP00356
Figure 2. Block Diagram
EQUIVALENT SCHEMATIC
(Shown for one circuit only)
CONTROL VOLTAGE
V
CC
R1
4.7K
R2
330
R3
4.7K
R4
1K
R7
5K
R12
6.8K
Q5
Q6 Q7
Q8
Q9
Q19
Q21
Q22
R13
3.3K
THRESHOLD
Q1
Q2 Q3
Q4
R10
3.2K
OUTPUT
Q23
C
B
CB
Q18
E
R11
4.7K
Q17
Q16
R5
10K
TRIGGER
Q10
Q25
Q11 Q12
Q13
R8
5K
Q20
R14
220
Q24
RESET
DISCHARGE
GND
Q14
Q15
R6
100K
R16
100
R9
5K
R15
4.7K
SP00357
Figure 3. Equivalent Schematic
2001 Aug 03
3
Philips Semiconductors
Product data
Dual timer
NE/SA556
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
P
D
T
amb
T
stg
T
SOLD
Supply voltage
Maximum allowable power dissipation
1
Operating temperature range
NE556
SA556
Storage temperature range
Lead soldering temperature (10 sec max)
PARAMETER
RATING
+16
800
0 to +70
-40 to +85
-65 to +150
+230
UNIT
V
mW
°C
°C
°C
°C
NOTE:
1. The junction temperature must be kept below 125
°C
for the D package and below 150
°C
for the N package. At ambient temperatures
above 25
°C,
where this limit would be exceeded, the Maximum Allowable Power Dissipation must be derated by the following:
D package 115
°C/W
N package 80
°C/W
2001 Aug 03
4
Philips Semiconductors
Product data
Dual timer
NE/SA556
ELECTRICAL CHARACTERISTICS
T
amb
= 25
°C,
V
CC
= +5 V to +15 V, unless otherwise specified.
SYMBOL
V
CC
I
CC
PARAMETER
Supply voltage
Su ly
Supply current (low state)
1
Timing error (monostable)
Initial accuracy
2
Drift with temperature
Drift with supply voltage
Timing error (astable)
Initial accuracy
2
Drift with temperature
Drift with supply voltage
Control voltage level
Threshold voltage
Threshold current
3
Trigger voltage
Trigger current
Reset voltage
5
Reset current
I
RESET
Reset current
V
RESET
= 0.4 V
V
RESET
= 0 V
V
CC
= 15 V
I
SINK
= 10 mA
I
SINK
= 50 mA
I
SINK
= 100 mA
I
SINK
= 200 mA
V
CC
= 5 V
I
SINK
= 8 mA
I
SINK
= 5 mA
V
CC
= 15 V
I
SOURCE
= 200 mA
I
SOURCE
= 100 mA
V
CC
= 5 V
I
SOURCE
= 100 mA
t
R
t
F
Rise time of output
Fall time of output
Discharge leakage current
Matching
Initial accuracy
2
Drift with temperature
Drift with supply voltage
characteristics
4
V
CC
= 5 V, R
L
=
∞
V
CC
= 15 V, R
L
=
∞
R
A
= 2k
Ω
to 100 kΩ
C = 0.1
µF
T = 1.1 RC
R
A
, R
B
= 1 kΩ to 100 kΩ
C = 0.
µF
V
CC
= 15 V
V
CC
= 15 V
V
CC
= 5 V
V
CC
= 15 V
V
CC
= 5 V
V
CC
= 15 V, V
TH
= 10.5 V
V
CC
= 15 V
V
CC
= 5 V
V
TRIG
= 0 V
0.4
0.4
4.5
1.1
9.0
2.6
8.8
2.4
TEST CONDITIONS
Min
4.5
6
20
0.75
50
0.1
5
400
0.3
10.0
3.33
10.0
3.33
30
5.0
1.67
0.5
0.7
0.1
0.4
0.1
0.4
2.0
2.5
0.25
0.15
12.5
13.3
3.3
100
100
20
1.0
±10
0.2
300
300
100
2.0
0.5
ns
ns
nA
%
ppm/°C
%/V
Typ
Max
16
12
30
3.0
150
0.5
13
500
1
11.0
4.0
11.2
4.2
250
5.6
2.2
2.0
1.0
0.6
1.5
0.25
0.75
3.2
UNIT
V
mA
mA
%
ppm/°C
%/V
%
ppm/°C
%/V
V
V
V
nA
V
V
µA
V
mA
mA
t
M
∆t
M
/∆T
∆t
M
/∆V
S
t
A
∆t
A
/∆T
∆t
A
/∆V
S
V
C
V
TH
I
TH
V
TRIG
I
TRIG
V
RESET
V
V
O
OL
Output voltage (low)
0.3
0.25
V
V
OH
Output voltage ( g )
g (high)
12.75
2.75
V
NOTES:
1. Supply current when output is high is typically 1.0 mA less.
2. Tested at V
CC
= 5 V and V
CC
= 15 V.
3. This will determine maximum value of R
A
+R
B
. For 15 V operation, the max total R = 10 MΩ, and for 5 V operation, the maximum total
R = 3.4 MΩ.
4. Matching characteristics refer to the difference between performance characteristics for each timer section in the monostable mode.
5. Specified with trigger input high. In order to guarantee reset the voltage at reset pin must be less than or equal to 0.4 V. To disable reset
function, the voltage at reset pin has to be greater than 1 V.
6. Time measured from a positive-going input pulse from 0 to 0.4 V
CC
into the threshold to the drop from high to low of the output. Trigger is
tied to threshold.
2001 Aug 03
5
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