TS803
Microprocessor Reset Circuit
SOT-23
Pin Definition:
TS803
TS803R
1. Ground
1. Reset
2. Reset
2. Ground
3. Vcc
3. Vcc
General Description
The TS803/TS803R are microprocessor (µP) supervisory circuit used to monitor the power supplies in µP and digital
systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments
when used with +5V, +3.3V, +3.0V powered circuits. These circuits perform a single function: they assert a reset
signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms
after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply
voltages are available. The TS803/TS803R are open –drain outputs. The TS803/TS803R have an active low RESET
output, while the TS803/TS803R has an active high RESET output. The reset comparator is designed to ignore fast
transients on VCC, and the output guaranteed to be in the correct logic state for VCC down to 1V. Low supply correct
makes the TS803/TS803R ideal for use in portable equipment.
Features
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Precision monitoring of +3V, +3.3V & +5V power
supply voltage
Fully specified over temperature
Available in three output configurations
Open-Drain RESET low output
3uA supply current
Guaranteed reset valid to Vcc = +1V
Power supply transient immunity
No external components
Computers
Controllers
Intelligent Instruments
Critical uP and uC power monitoring
Portable / Battery Power Equipment
Automotive
Ordering Information
Part No.
Package
Packing
TS803CXx RF
SOT-23
3Kpcs / 7” Reel
TS803RCXx RF
SOT-23
3Kpcs / 7” Reel
Note:
x
is the threshold voltage type, option as
TS803
Threshold Voltage
A
: 4.63V
B
: 4.38V
C
: 4.00V
D
: 3.08V
E
: 2.93V
F
: 2.63V
G
: 2.32V
H
: 2.1V
I
: 2.0V
J
: 1.8V
K
:1.6V
TS803R
Threshold Voltage
B
: 4.20V
E
: 2.93V
F
: 2.70V
Contact factory for additional voltage options.
Applications
Absolute Maximum Rating
Parameter
Supply Voltage
RESET & (RESET) Open Drain
Input Current, V
CC
Output Current, RESET
Rate of Rise, V
CC
Symbol
V
CC
V
RESET
I
CC
I
O
V
R
Value
7
- 0.3 ~ (V
CC
+0.3)
20
20
100
Unit
V
V
mA
mA
V/uS
ESD Classification
B
Note: Stress above the listed absolute maximum rating may cause permanent damage to the device
HBM B: 2000V~3999V
1/6
Version: A07
TS803
Microprocessor Reset Circuit
Recommended Operating Conditions
Parameter
Supply Voltage
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance
Power Dissipation
Lead Soldering Temperature (260 C)
o
Symbol
V
CC
T
A
T
J
T
STG
Θjc
P
D
T
LEAD
Value
<5
-40 ~ +85
-40 ~ +125
-65 ~ +150
325
350
10
Unit
V
o
o
o
o
C
C
C
C/W
mW
S
Electrical Characteristics
Ta=25
o
C, unless otherwise specified.
Parameter
Input Supply Voltage
Supply Current
o
Conditions
Ta=-40 C~+85 C
V
CC
≤
V
TH
* 1.1
V
IN
= 3V, Ta=-40 C~+85 C
o
o
o
Symbol
V
CC
I
CC
V
TH
Min
1.0
--
--
0.985
|V
TH
|
Typ
--
--
--
--
Max
5.5
3
5
1.015
|V
TH
|
1.02
|V
TH
|
160
--
5
0.5
Unit
V
uA
Reset Threshold
Reset Threshold
(Full temperature range)
Reset Threshold
Temperature Coefficient
V
CC
to Reset Delay
Reset Active Timeout Period
RESET Output Voltage Low
V
CC
= V
TH
to (V
TH
- 100mV)
Ta=-40 C~+85 C
V
CC
< V
TH(MIN),
I
SINK
=1.2mA,
V
CC
> V
TH(MAX),
I
SOURCE
=500uA
RESET Output Voltage High
V
CC
> 1.8V
V
CC
> V
TH(MAX),
I
SOURCE
=150uA,
o
o
V
V
TH
0.97
|V
TH
|
--
V
ppm/ C
uS
mS
V
o
V
TH
3-0
--
0.5
--
50
40
1.5
--
T
DELAY
V
OL
V
OH
0.8 V
CC
--
--
V
1.8V >= V
CC
> 1V
Note 1: The data based on V
TH
= 2.7V part type.
Note 2: Guaranteed by Design
2/6
Version: A07
TS803
Microprocessor Reset Circuit
Function Block
Function Description
Typical Application Circuit
Timing Diagram
Electrical Characteristics Curve
Figure 1. Glitch Rejection
3/6
Figure 2. Reset Time vs. Temperature
Version: A07
TS803
Microprocessor Reset Circuit
Electrical Characteristics Curve (Continue)
Figure 3. Iin vs. Temperature
Figure 4. Reset Vth vs. Temperature
Figure 5. Iin vs. Vin
Figure 6. Threshold Hysteresis vs. Temperature
Figure 7. Reset VOL vs. Temperature
4/6
Version: A07
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