www.fairchildsemi.com
KA556
Dual Timer
Features
•
•
•
•
•
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•
Replaces two KA555 Timers
Operates in Both Astable and Monos Table Modes
High Output Current
TTL Compatible
Timing From Microsecond to Hours
Adjustable Duty Cycle
Temperature Stability of 0.005% Per
°C
Description
The KA556 series dual monolithic timing circuits are a
highly stable controller capable of producing accurate time
delays or oscillation. The KA556 is a dual KA555. Timing is
provided 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 200mA.
14-DIP
Applications
•
•
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•
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Precision Timing
Pulse Shaping
Pulse Width Modulation
Frequency Division
Traffic Light Control
Sequential Timing
Pulse Generator
Time Delay Generator
Touch Tone Encoder
Tone Burst Generator
1
14-SOP
1
Internal Block Diagram
Trigger
Threshold
Control Voltage
3
14
V
CC
6
12
11
R
Control Voltage
5
Trigger
R
2
Comparator
R
R
Comparator
Comparator
R
R
Comparator
THRESHOLD
1
Discharge
Flip Flop
Flip Flop
Output
Output
Output
5
Reset
4
GND
7
13
Discharge
9
Output
10
Reset
Rev. 1.0.1
©2004 Fairchild Semiconductor Corporation
KA556
Absolute Maximum Ratings (T
A
= 25°C)
Parameter
Supply Voltage
Lead Temperature (Soldering 10sec)
Power Dissipation
Operating Temperature Range
KA556/KA556I
Storage Temperature Range
Symbol
V
CC
T
LEAD
P
D
T
OPR
T
STG
Value
16
300
600
0 ~ +70 / -40 ~ +85
-65 ~ +150
Unit
V
°C
mW
°C
°C
2
KA556
Electrical Characteristics
(T
A
= 25°C, V
CC
= 5 ~ 15V, unless otherwise specified)
Parameter
Supply Voltage
Supply Current *
1
(Two Timers)
(Low State)
Timing Error *
2
(Monos Table)
Initial Accuracy
Drift with Temperature
Drift with Supply Voltage
Control Voltage
Threshold Voltage
Threshold Current*
3
Trigger Voltage
Trigger Current
Reset Voltage*
5
Reset Current
Symbol
V
CC
I
CC
ACCUR
∆t/∆T
∆t/∆V
CC
V
CC
V
TH
I
TH
V
TR
I
TR
V
RST
I
RST
V
CC
= 15V
V
CC
= 5V
V
TR
= 0V
-
-
V
CC
= 15V
I
SINK
= 10mA
I
SINK
= 50mA
I
SINK
= 100mA
I
SINK
= 200mA
V
CC
= 5V
I
SINK
= 8mA
I
SINK
= 5mA
V
CC
= 15V
I
SOURCE
= 200mA
I
SOURCE
= 100mA
V
CC
= 5V
I
SOURCE
= 100mA
Rise Time of Output
Fall Time of Output
Discharge Leakage Current
Matching Characteristics*
4
Initial Accuracy
Drift with Temperature
Drfit with Supply Voltage
Timing Error (astable)*
2
Initial Accuracy
Drift with Temperature
Drift with Supply Voltage
t
R
t
F
I
LKG
ACCUR
∆t/∆T
∆t/∆V
CC
ACCUR
∆t/∆T
∆t/∆Vcc
-
-
-
-
Conditions
-
V
CC
= 5V, R
L
=
∞
V
CC
= 15V, R
L
=
∞
R
A
= 2kΩ to 100kΩ
C = 0.1µF
T = 1.1RC
V
CC
= 15V
V
CC
= 5V
V
CC
= 15V
V
CC
= 5V
-
Min.
4.5
-
Typ.
-
5
16
0.75
50
0.1
10.0
3.33
10.0
3.33
30
5.0
1.6
0.01
0.6
0.03
0.1
0.4
2.0
2.5
0.25
0.15
12.5
13.3
3.3
100
100
10
1.0
10
0.2
2.25
150
0.3
Max.
16
12
30
-
11.0
4.0
11.2
4.2
250
5.6
2.2
2.0
1.0
0.6
0.25
0.75
3.2
0.35
0.25
-
-
300
300
100
2.0
0.5
-
Unit
V
mA
mA
%
ppm/°C
%/V
V
V
V
V
nA
V
V
µA
V
mA
V
-
9.0
2.6
8.8
2.4
-
4.5
1.1
-
0.4
-
Low Output Voltage
V
OL
-
V
V
V
ns
ns
nA
%
ppm/°C
%/V
%
ppm/°C
%/V
High Output Voltage
V
OH
12.75
2.75
-
-
-
-
V
CC
= 15V
R
A
,R
B
= 1kΩ to 100kΩ
C = 0.1µF
-
Notes:
1. Supply current when output is high is typically 1.0mA less at V
CC
= 5V
2. Tested at V
CC
= 5V and V
CC
= 15V
3. This will determine the maximum value of R
A
+ R
B
for 15V operation.
The maximum total R = 20MΩ, and for 5V operation the maximum total R = 6.6MΩ.
4. Matching characteristics refer to the difference between performance characteristics of each timer section in the monostable
mode.
5. As reset voltage lowers, timing is inhibited and then the output goes low.
3
KA556
Mechanical Dimensions
Package
Dimensions in millimeters
14-DIP
6.40
±0.20
0.252
±0.008
19.80
MAX
0.780
19.40
±0.20
0.764
±0.008
#7
#8
7.62
0.300
3.25
±0.20
0.128
±0.008
0.20
MIN
0.008
5.08
MAX
0.200
3.30
±0.30
0.130
±0.012
0.25
–0.05
+0.10
0~15
°
0.010
–0.002
+0.004
4
2.54
0.100
0.46
±0.10
0.018
±0.004
1.50
±0.10
0.059
±0.004
#1
#14
(
2.08
)
0.082
KA556
Mechanical Dimensions
(Continued)
Package
Dimensions in millimeters
14-SOP
MIN
1.55
±0.10
0.061
±0.004
0.05
0.002
0.47
)
0.019
MAX0.10
MAX0.004
1.27
0.050
+
0.004
0.016
-0.002
0.406
+
0.10
-0.05
(
#1
#14
8.70
MAX
0.343
#7
6.00
±0.30
0.236
±0.012
#8
1.80
MAX
0.071
+
0.004
0.008
-0.002
+
0.10
-0.05
0.20
3.95
±0.20
0.156
±0.008
0.60
±0.20
0.024
±0.008
5.72
0.225
0~
8
°
8.56
±0.20
0.337
±0.008
5
