Datasheet

UNISONIC TECHNOLOGIES CO., LTD
USA555
LINEAR INTEGRATED CIRCUIT
PRECISION TIMERS

DESCRIPTION
The UTC USA555 monolithic timing circuit is a highly stable
controller capable of producing accurate time delays or
oscillation. In the time-delay or monostable mode of operation,
the timed interval is controlled by a single external resistor and
capacitor network.
In the astable mode of operation, the frequency and duty cycle
can be controlled independently with two external resistors and a
single external capacitor.
The threshold and trigger levels normally are two-thirds and
one-third, respectively, of VCC. These levels can be altered by use
of the control-voltage terminal. When the trigger input falls below
the 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
discharge (DISCH) and ground.
The circuit may be triggered and reset on falling waveforms,
and the output structure can source or sink up to 200mA.
Operation is specified for supplies of 5V~15V.

SOP-8
DIP-8
FEATURES
* Astable or monostable operation
* Low turn off time
* Operates in both astable and monostable modes
* Timing from microseconds to hours
* Adjustable duty cycle
* TTL-compatible output can sink or source up to 200mA

ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
USA555G-S08-R
USA555L-D08-T
USA555G-D08-T
Note: xx: Output Voltage, refer to Marking Information.
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
Package
Packing
SOP-8
DIP-8
Tape Reel
Tube
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QW-R106-005.C
USA555

LINEAR INTEGRATED CIRCUIT
MARKING
SOP-8


PIN CONFIGURATION
GND 1
8
VCC
TRIG 2
7
DISCH
OUT
3
6
THRES
RESET 4
5
CONT
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8

DIP-8
PIN NAME
GND
TRIG
OUT
RESET
CONT
THRES
DISCH
VCC
DESCRIPTION
Ground
Trigger signal
Output terminal
Reset terminal
Control voltage
Threshold
Discharge
Power supply
FUNCTION TABLE
TRIGGER
VOLTAGE (Note)
Low
Irrelevant
High
< 1/3 VCC
High
> 1/3 VCC
High
> 1/3 VCC
Note: Voltage levels shown are nominal.
RESET
THRESHOLD
VOLTAGE (Note)
Irrelevant
Irrelevant
> 2/3 VCC
< 2/3 VCC
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DISCHARGE
SWITCH
Low
On
High
Off
Low
On
As previously established
OUTPUT
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
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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USA555

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (over operating free-air temperature range, unless otherwise noted)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage (Note 2)
VCC
18
V
Input Voltage
CONT, RESET, THRES, TRIG
VI
VCC
V
Output Current
IO
±225
mA
Operating Virtual Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-65~150
°C
Note: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. All voltage values are with respect to GND.

RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless
otherwise noted)
PARAMETER
Supply Voltage
Input Voltage
Output Current
Operating Free-Air Temperature

SYMBOL
VCC
VI
IO
TA
RATINGS
4.5~16
VCC
±200
-40~85
UNIT
V
V
mA
°C
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
SOP-8
97
°C/W
Package Thermal Impedance (Note 1, 2)
θJA
DIP-8
85
°C/W
Notes: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation
at any allowable ambient temperature is PD=(TJ(max)-TA)/θJA. Operating at the absolute maximum TJ of
150°C can affect reliability.
2. The package thermal impedance is calculated in accordance with JESD 51-7.

ELECTRICAL CHARACTERISTICS (VCC=5V~15V, TA=25°C, unless otherwise noted)
PARAMETER
SYMBOL
THRES Voltage Level
VTH
THRES Current (Note)
ITH
TRIG Voltage Level
TRIG Current
RESET Voltage Level
VTRIG
ITRIG
VRESET
RESET Current
IRESET
DISCH Switch Off-State Current
IDISCH
CONT Voltage (Open Circuit)
VCONT
Low-Level Output Voltage
High-Level Output Voltage
VOL
VOH
TEST CONDITIONS
VCC=15V
VCC=5V
MIN
8.8
2.4
VCC=15V
VCC=5V
TRIG at 0V
4.5
1.1
0.3
RESET at VCC
RESET at 0V
VCC=15V
VCC=5V
VCC=15V, IOL=10mA
VCC=15V, IOL=50mA
VCC=15V, IOL=100mA
VCC=15V, IOL=200mA
VCC=5V, IOL=5mA
VCC=5V, IOL=8mA
VCC=15V, IOL=-100mA
VCC=15V, IOL=-200mA
VCC=5V, IOL=-100mA
UNISONIC TECHNOLOGIES CO., LTD
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9
2.6
12.75
2.75
TYP
10
3.3
30
5
1.67
0.5
0.7
0.1
-0.4
20
10
3.3
0.1
0.4
2
2.5
0.1
0.15
13.3
12.5
3.3
MAX
11.2
4.2
250
5.6
2.2
2
1
0.4
-1.5
100
11
4
0.25
0.75
2.5
0.35
0.4
UNIT
V
V
nA
V
V
µA
V
mA
mA
nA
V
V
V
V
V
V
V
V
V
V
V
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LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VCC=15V
10
15
mA
Output Low,
No Load
VCC=5V
3
6
mA
Supply Current
ICC
VCC=15V
9
13
mA
Output High,
No Load
VCC=5V
2
5
mA
Note: This parameter influences the maximum value of the timing resistors RA and RB in the circuit of Figure 2. For
example, when VCC=5V, the maximum value is R=RA+RB≠3.4MΩ, and for VCC=15V, the maximum value is
10MΩ.

SYMBOL
OPERATING CHARACTERISTICS (VCC=5V~15V, TA=25°C, unless otherwise noted)
PARAMETER
SYMBOL
TEST CONDITIONS
(Note 1)
MIN
TYP
MAX
UNIT
Each Timer, Monostable
TA=25°C
1
3
%
(Note 3)
Each Timer, Astable
2.25
%
(Note 4)
Each Timer, Monostable
TA=MIN~MAX
50
ppm/°C
Temperature
(Note 3)
Coefficient of
Each Timer, Astable
Timing Interval
150
ppm/°C
(Note 4)
Each Timer, Monostable
TA=25°C
0.1
0.5
%/V
Supply-Voltage
(Note 3)
Sensitivity of
Each Timer, Astable
Timing Interval
0.3
%/V
(Note 4)
Output-Pulse Rise Time
TR
CL=15pF, TA=25°C
100
300
ns
Output-Pulse Fall Time
TF
CL=15pF, TA=25°C
100
300
ns
Notes: 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 1, with the following component
values: RA=2kΩ~100kΩ, C=0.1µF.
4. Values specified are for a device in an astable circuit similar to Figure 2, with the following component
values: RA=1kΩ~100kΩ, C=0.1µF.
Initial Error of
Timing Interval
(Note 2)
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LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
VCC
(5V~15V)
5
RA
8
CONT
4
RL
RESET
7
DISCH
OUT
6
3
Output
THRES
2
Input
VCC
TRIG
GND
1
Figure 1. Circuit for Monostable Operation
VCC
(5V~15V)
0.01µF
Open
(see Note 1)
RA
4
7
6
RB
2
5
8
CONT
VCC
RL
RESET
DISCH
3
OUT
Output
THRES
TRIG
C
GND
1
Notes: 1. Decoupling CONT voltage to ground with a capacitor can improve operation.
This should be evaluated for individual applications.
2. T1 = 0.693 × (RA+RB)×C1
T2 = 0.693 × RB × C1
f=
1
T
=
1.44
(RA + 2RB) × C1
3. Formula 0.693 values for reference only.
Figure 2. Circuit for Astable Operation
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TYPICAL CHARACTERISTICS
CH1: 1V/div
C1 (uF)

LINEAR INTEGRATED CIRCUIT
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LINEAR INTEGRATED CIRCUIT
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.
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www.unisonic.com.tw
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