TS809 Datasheet, PDF (1/6 Pages) Taiwan Semiconductor Company, Ltd – Microprocessor Reset Circuit

General Description
TS809/ 810/ 809R/ 810R
Microprocessor Reset Circuit
Pin assignment:
TS809/810
1. Gnd
2. RESET (RESET)
3. Vcc
Pin assignment:
TS809R/810R
1. RESET (RESET)
2. Gnd
3. Vcc
Threshold Voltage Option
From 2.63V ~ 4.63V
The TS809/810/809R/810R 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
240ms(typ) after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of
supply voltages are available. The TS809/810/809R/810R have push pull outputs. The TS809/809R have an active
low RESET output, while the TS810/810R 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 TS809/810/809R/810R ideal for use in portable equipment.
The TS809/810/809R/810R is available in a 3-pin SOT-23 package.
Features
Ordering Information
Precision monitoring of +3V, +3.3V and +5V
power supply voltage
Fully specified over temperature
Available in three output configurations
Push-Pull RESET low output (TS809 & TS809R)
Push-Pull RESET high output (TS810 & TS810R)
140mS min. power-on reset pulse width
12uA supply current
Guaranteed reset valid to Vcc = +1V
Power supply transient immunity
No external components
Part No.
Enable Function
Package
TS809CX x
Active-Low
TS810CX x
Active-High
SOT-23
TS809RCXx
Active-Low
TS810RCXx
Active-High
Note: x is the threshold voltage type, option as
A: 4.63V
B: 4.38V
C: 4.00V
D: 3.08V
E: 2.93V
F: 2.63V
Applications
Computers
Controllers
Intelligent instruments
Critical uP and uC power monitoring
Portable / Battery powered equipment
Automotive
Pin Descriptions
Name
Gnd
RESET
(RESET)
Vcc
Description
Ground
Reset output pin
L: for TS809 & TS811
H: for TS809R & TS811R
Operating voltage input
TS809/810/809R/810R
1-6
2004/09 rev. D