PRELIMINARY INFORMATION
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TCM809
TCM810
3-PIN µP RESET MONITORS
FEATURES
GENERAL DESCRIPTION
■ Precision VCC Monitor for 3.0V, 3.3V, 5.0V
Nominal System V Supplies
■ 140msec Guaranteed Minimum RESET, RESET
Output Duration
The TCM809 and TCM810 are cost-effective system
supervisor circuits designed to monitor VCC in digital sys-
tems and provide a reset signal to the host processor when
necessary. No external components are required.
■
RESET Output Guaranteed to VCC = 1.0V (TCM809)
The reset output is driven active within 20msec of V
CC
■ Low 17µA Supply Current
■ VCC Transient Immunity
■ Small SOT-23B-3 Package
■ No External Components
falling through the reset voltage threshold. Reset is main-
tained active for a minimum of 140msec after VCC 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 is guaranteed valid down
to VCC = 1V. Both devices are available in a
SOT-23B-3 package.
The TCM809/810 are optimized to reject fast transient
glitches on the VCC line. Low supply current of 17µA
(VCC = 3.3V) makes these devices suitable for battery
powered applications.
TYPICAL APPLICATIONS
■ Computers
■ Embedded Systems
■ Battery Powered Equipment
■ Critical µP Power Supply Monitoring
TYPICAL OPERATING CIRCUIT
ORDERING INFORMATION
VCC
Part No.
Package
Temp. Range
T
CM809xENB
SOT-23B-3
SOT-23B-3
– 40°C to +85°C
– 40°C to +85°C
VCC
VCC
TCM810xENB
PROCESSOR
NOTE: The "X" denotes a suffix for VCC threshold - see table below.
RESET
INPUT
RESET
TCM809
Suffix
Reset VCC Threshold (V)
GND
GND
L
M
T
4.63
4.38
3.08
2.93
2.63
S
R
PIN CONFIGURATION
*SOT-23B-3
1
GND
V
TCM809xENB
TCM810xENB
3
CC
RESET (RESET)
2
NOTE: *SOT-23B-3 is equivalent to JEDEC (TO-236)
** () is for TCM810
TCM809/810-04 8/29/96
TELCOM SEMICONDUCTOR, INC.
5-15