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| TCM809_05 Datasheet, PDF (1/16 Pages) Microchip Technology – 3-Pin Microcontroller Reset Monitors | |||
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TCM809/TCM810
3-Pin Microcontroller Reset Monitors
Features
⢠Precision VDD Monitor for 2.5V, 3.0V, 3.3V, 5.0V
Nominal System Voltage Supplies
⢠140 msec Minimum RESET Time-Out Period
⢠RESET Output to VDD = 1.0V (TCM809)
⢠Low Supply Current, 9 µA (typ.)
⢠VDD Transient Immunity
⢠Small 3-Pin SC-70 and SOT-23B Packages
⢠No External Components
⢠Push-Pull RESET Output
⢠Temperature Ranges:
- Industrial: SC-70 (E): -40°C to +85°C
- Extended: SOT-23, SC-70 (V): -40°C to +125°C
Applications
⢠Computers
⢠Embedded Systems
⢠Battery-powered Equipment
⢠Critical Microcontroller Power Supply Monitoring
⢠Automotive
Typical Application Circuit
VDD
3
VDD
TCM809
RESET 2
GND
1
VDD
PICmicro®
Microcontroller
RESET
INPUT
(Active-Low)
GND
General Description
The TCM809 and TCM810 are cost-effective system
supervisor circuits designed to monitor VDD in digital
systems; providing a reset signal to the host processor,
when necessary. No external components are
required.
The RESET output is typically driven active within
65 µsec of VDD falling through the reset voltage thresh-
old. RESET is maintained active for a minimum of
140 msec after VDD rises above the reset threshold.
The TCM810 has an active-high RESET output, while
the TCM809 has an active-low RESET output. The
output of the TCM809/TCM810 is valid down to
VDD = 1V. Both devices are available in 3-Pin SC-70
and SOT-23B packages.
The TCM809/TCM810 are optimized to reject fast
transient glitches on the VDD line. A low supply current
of 9 µA (typ., VDD = 3.3V) make these devices suitable
for battery-powered applications.
Pin Configurations
SOT-23B/SC-70
GND 1
TCM809 RESET 2
TCM810 (RESET)
3 VDD
Note: 3-Pin SOT-23B is equivalent to
JEDEC TO-236.
© 2005 Microchip Technology Inc.
DS21661D-page 1
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