PRELIMINARY INFORMATION
1
TCM809
TCM810
3-PIN
µ
P RESET MONITORS
FEATURES
s
s
s
s
s
s
s
Precision V
CC
Monitor for 3.0V, 3.3V, 5.0V
Nominal System V Supplies
140msec Guaranteed Minimum RESET, RESET
Output Duration
RESET Output Guaranteed to V
CC
= 1.0V (TCM809)
Low 17
µ
A Supply Current
V
CC
Transient Immunity
Small SOT-23B-3 Package
No External Components
GENERAL DESCRIPTION
The TCM809 and TCM810 are cost-effective system
supervisor circuits designed to monitor V
CC
in digital sys-
tems and provide a reset signal to the host processor when
necessary. No external components are required.
The reset output is driven active within 20msec of V
CC
falling through the reset voltage threshold. Reset is main-
tained active for a minimum of 140msec after V
CC
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 V
CC
= 1V. Both devices are available in a
SOT-23B-3 package.
The TCM809/810 are optimized to reject fast transient
glitches on the V
CC
line. Low supply current of 17µA
(V
CC
= 3.3V) makes these devices suitable for battery
powered applications.
2
3
4
5
6
7
TYPICAL APPLICATIONS
s
s
s
s
Computers
Embedded Systems
Battery Powered Equipment
Critical
µ
P Power Supply Monitoring
TYPICAL OPERATING CIRCUIT
V
CC
V
CC
V
CC
PROCESSOR
RESET
INPUT
ORDERING INFORMATION
Part No.
TCM809xENB
TCM810xENB
Package
SOT-23B-3
SOT-23B-3
Temp. Range
– 40°C to +85°C
– 40°C to +85°C
NOTE: The "X" denotes a suffix for V
CC
threshold - see table below.
RESET
TCM809
GND
Suffix
GND
Reset V
CC
Threshold (V)
4.63
4.38
3.08
2.93
2.63
PIN CONFIGURATION
*SOT-23B-3
L
M
T
S
R
GND
1
TCM809xENB
TCM810xENB
3
VCC
RESET (RESET)
2
NOTE: *SOT-23B-3 is equivalent to JEDEC (TO-236)
** () is for TCM810
TCM809/810-04
8/29/96
8
5-15
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
