TS803R
Microprocessor Reset Circuit
Pin assignment TS803R 1. RESET 2. Gnd 3. Vcc
Open Drain Threshold Voltage Option 2.7V, 2.93V, 4.2V
General Description
The 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 TS803R are open –drain outputs. The TS803R have an active low RESET output, while the 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 TS803R ideal for use in portable equipment. The TS803R is available in a 3-pin SOT-23 package.
Features
Precision monitoring of +3V, +3.3V and +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
Ordering Information
Part No.
TS803RCX B TS803RCX E TS803RCX F
Enable Function
Active-Low Active-Low Active-Low
Threshold Voltage
4.2V 2.93V 2.7V
Package
SOT-23
Note: x is the threshold voltage type, option as B: 4.20V E: 2.93V F: 2.70V
Applications
Computers Controllers Intelligent instruments Critical uP and uC power monitoring Portable / Battery powered equipment Automotive
Pin Descriptions
Pin No.
1 2 3
Name
RESET Gnd Vcc
Description
Reset output pin (Active- Low) Ground Operating voltage input
Absolute Maximum Rating
Supply Voltage RESET & (RESET) push-pull Input Current, Vcc Output Current, RESET Rate of Rise, Vcc VCC VRESET ICC IO VR 7 - 0.3 ~ (VCC +0.3) 20 20 100 V V mA mA V/uS
TS803R
1-1
2003/12 rev. E
Recommended Operating Conditions
Supply Voltage Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Thermal Resistance Power Dissipation Lead Soldering Temperature (260 C)
o
VCC Ta(op) Tj(op) TSTG Θjc PD TLEAD
VTH(MAX), ISOURCE =500uA VCC > 1.8V VCC > VTH(MAX), ISOURCE =150uA, 1.8V >= VCC > 1V Note 1 : The data based on VTH = 2.7V part type.
VTH
--
30
--
ppm/
o
C
TDELAY
-0.5
40 1.5 --
-5 0.5
uS mS V
VOL
--
VOH
0.8 VCC
--
--
V
TS803R
2-2
2003/12 rev. E
Function Block
Function Description Applications Circuit Timing Diagram
Electrical Characteristics Curve
TS803R
3-3
2003/12 rev. E
Electrical Characteristics Curve
TS803R
4-4
2003/12 rev. E
SOT-23 Mechanical Drawing
A B
F
DIM A B C D E SOT-23 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 2.88 2.91 0.113 0.115 0.39 0.42 0.015 0.017 1.78 2.03 0.070 0.080 0.51 0.61 0.020 0.024 1.59 1.66 0.063 0.065 1.04 0.07 1.08 0.09 0.041 0.003 0.043 0.004
E
G
F G
D
C
TS803R
5-5
2003/12 rev. E
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