1
TC32M
ECONOMONITOR鈩?鈥?3-PIN SYSTEM SUPERVISOR WITH POWER
SUPPLY MONITOR AND WATCHDOG
FEATURES
s
Incorporates the Functionality of the Industry
Standard TC1232 (Processor Monitor, Watchdog
and Manual Override RESET Controller) into a
Small, Lower Cost Package
Guards Against Unstable Processor Operation
Resulting from Power "Brown-Out"
Automatically Halts and Restarts an Out-of-
Control Microprocessor
Output can be Wire-ORed, or Hooked to Manual
RESET Push-button Switch
Space-Saving 3-Pin TO-92 or SOT-223 Package
2
3
4
5
6
7
GENERAL DESCRIPTION
The TC32M is a fully-integrated processor supervisor in
a 3-pin package. It provides three important functions to
safeguard processor sanity: precision power on/off RESET
control, watchdog timer and external RESET override.
On power-up, the TC32M holds the processor in the
reset state for a minimum of 500msec after V
DD
is within
tolerance to ensure a stable system start-up. Microproces-
sor sanity is monitored by the on-board watchdog circuit.
The microprocessor must provide a high-to-low level shift
(through an external resistor divider) on the RS pin of the
TC32M. Should the processor fail to supply this signal within
the specified timeout period (typically 700msec), an out-of-
control processor is indicated and the TC32M issues a
processor reset as a result.
The output of the TC32M can be wire-ORed with a push-
button switch (or electronic signal) to override the TC32M
and unconditionally reset the processor. When connected to
a push-button switch, the TC32M provides contact debounce.
The TC32M is packaged in a space-saving TO-92
or SOT-223 package. It provides all of the functionality of the
industry standard TC1232 in a smaller, lower cost configu-
ration.
s
s
s
s
APPLICATIONS
s
s
s
s
s
s
All Microprocessor-Based Systems
Battery Powered Computers and Controllers
Automotive Systems
Intelligent Instruments
Critical Processor Monitoring
Embedded Controllers
TO-92
1
2 3
PIN CONFIGURATIONS
SOT-223
VDD
4
ORDERING INFORMATION
Part No.
TC32MCDB
3
RS
TC32MCZB
TC32MEZB
1
TC32MCDB
TC32MEDB
2
VDD
Package
SOT-223
TO-92
SOT-223
TO-92
Temperature
Range
0擄C to +70擄C
0擄C to +70擄C
鈥?40擄C to +85擄C
鈥?40擄C to +85擄C
GND
TC32MCZB
TC32MEDB
TC32MEZB
GND
VDD
RS
FUNCTIONAL BLOCK DIAGRAM
V
DD
TYPICAL OPERATING CIRCUIT
5V
V
REF1
TC32M
R1, 10k
R2,10k
MICRO-
CONTROLLER
WATCHDOG
TIMER
鈭哣
DETECTOR
PO.1
RS
V
REF2
DELAY
TIMER
GND
RS
TC32M
RESET
RESET
MICROCONTROLLER EXAMPLE
TC32M-2 9/26/96
8
5-3
TELCOM SEMICONDUCTOR, INC.
1
2
3
4
