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UTC LM556
LINEAR INTEGRATED CIRCUIT
DUAL TIMER
DESCRIPTION
The UTC LM556 dual monolithic circuit is a highly
stable controller capable of producing accurate delays
or oscillation. The UTC LM556 is the dual of UTC
NE555; timing is provided an external resistor and
capacitor for each function. The two timers operate
independently of each other, sharing only Vcc and
GND. The circuits may be triggered and reset on
falling wave forms. The output structures may sink or
source 200mA.
SOP-14
FEATURES
*High current driver capability(=200mA)
*Adjustable duty cycle
*Timing from µ Sec to Hours
*Temperature stability of 0.005%/ ° C
*TTL compatible
*Operates in both Astable and Monostable modes
DIP-14
APPLICATIONS
*Precision timing.
*Pulse width modulation.
*Pulse generator, shaping.
*Traffic light control.
*Time delay generator.
*Touch tone encoder.
*Sequential timing.
*Tone burst generator.
BLOCK DIAGRAM
UTC UNISONIC TECHNOLOGIES CO., LTD.
1
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UTC LM556
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Ta=25 ° C )
PARAMETER
SYMBOL
VALUE
UNIT
Supply Voltage
Vcc
16
V
Power Dissipation
Pd
600
mW
Lead Temperature(soldering 10
sec.)
Tlead
300
° C
Operating Temperature
Topr
-40~85
° C
Storage Temperature
Tstg
-65~150
° C
ELECTRICAL CHARACTERISTICS
( Ta=25 ° C ,Vcc=5 to 15V, unless otherwise specified )
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Supply voltage
Vcc
4.5
16
V
Supply Current(two timers)
Icc
Vcc=5V,RL= ∝
5
12
mA
(low state), (Note 1)
Vcc=15V,RL= ∝
16
30
mA
Timing Error(monostable)
Initial Accuracy(Note 2)
A CCUR
R A =2K Ω to 100K Ω
C=0.1 µ F
T=1.1RC
0.75
%
Drift with Temperature
∆ t/ ∆ T
50
ppm/ ° C
Drift with Supply Voltage ∆ t/ ∆ Vcc
0.1
%/V
Timing Error(astable)
Initial Accuracy(Note 2)
A CCUR
R A =1K Ω to 100K Ω
C=0.1 µ F
Vcc=15V
2.25
%
Drift with Temperature
∆ t/ ∆ T
150
ppm/ ° C
Drift with Supply Voltage ∆ t/ ∆ Vcc
0.3
%/V
Control Voltage
Vc
Vcc=15V
9.0
10.0
11.0
V
Vcc=5V
2.6
3.33
4.0
V
Threshold Voltage
V TH
Vcc=15V
8.8
10.0
11.2
V
Vcc=5V
2.4
3.33
4.2
V
Threshold Current(Note 3)
I TH
30
250
nA
Trigger Voltage
Vtr
Vcc=5V
1.1
1.6
2.2
V
Vcc=15V
4.5
5
5.6
V
Trigger Current
Itr
Vtr=0
0.01
2.0 µ A
Reset Voltage(Note 4)
Vrst
0.4
0.6
1.0
V
Reset Current
Irst
0.03
0.6
mA
Low Output Voltage
V OL
Vcc=15V
0.1
0.25
V
Isink=10mA
Isink=50mA
Isink=100mA
Isink=200mA
0.4
0.75
V
2
3.2
V
2.5
V
Vcc=5V
Isink=5mA
Isink=8mA
0.15
0.25
V
0.25
0.35
V
UTC UNISONIC TECHNOLOGIES CO., LTD.
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UTC LM556
LINEAR INTEGRATED CIRCUIT
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
High Output Voltage
V OH
Vcc=15V
Isource=200mA
Isource=100mA
12.5
V
12.75 13.3
V
Vcc=5V
Isource=100mA
2.75
3.3
V
Rise Time of Output
t R
100
300
nSec
Fall Time of Output
t F
100
300
nSec
Discharge Leakage Current
I LKG
20
100
nA
Matching Parameter
Initial Accuracy(Note 5)
A CCUR
R A, R B =1K Ω to 100K Ω
C=0.1 µ F
Vcc=15V
1
2
%
Drift with Temperature
∆ t/ ∆ T
10
ppm/ ° C
Drift with Supply Voltage ∆ t/ ∆ Vcc
0.2
0.5
%/V
Note 1: Supply current when output is high is typically 1mA less at Vcc 5V.
Note 2: Tested at Vcc=5V and Vcc=15V.
Note 3: This will determine the maximum value of RA+RB for 15V operation, The maximum total is R=20M Ω , and
for 5V operation the maximum total is R=6.6M Ω .
Note 4: As reset voltage lower, timing is inhibited and then the output goes low.
Note 5: Matching parameters refer to the difference between performance parameters of each timer section in the
monostable mode.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UTC UNISONIC TECHNOLOGIES CO., LTD.
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