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 (碌P) supervisory circuit used to monitor the power supplies in 碌P 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 鈥揹rain 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 鈥?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
V
CC
V
RESET
I
CC
I
O
V
R
7
- 0.3 ~ (V
CC
+0.3)
20
20
100
V
V
mA
mA
V/uS
TS803R
1-1
2003/12 rev. E
1
2
3
4
5
