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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1232 Datasheet

Microprocessor Monitor

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TC1232 pdf
TC1232
Microprocessor Monitor
Features:
• Precision Voltage Monitor:
- Adjustable +4.5V or +4.75V
• Reset Pulse Width – 250 ms minimum
• No External Components
• Adjustable Watchdog Timer:
- 150 ms, 600 ms or 1.2s
• Operating Voltage 4.0V to 5.5V
• Debounced Manual Reset Input for External
Override
Block Diagram
VCC
Tolerance
Select
TOL (5% or 10%) +
+
+
VREF
RST
RST
PB RST
TD
Debounce
Watchdog
Timebase
Select
Reset
Generator
Watchdog
Timer
ST
General Description:
The TC1232 is a fully-integrated processor supervisor
that provides three important functions to safeguard
processor sanity: precision power on/off Reset control,
Watchdog Timer and external Reset override.
On power-up, the TC1232 holds the processor in the
Reset state for a minimum of 250 ms after VCC is within
tolerance to ensure a stable system start-up.
Microprocessor sanity is monitored by the on-board
watchdog circuit. The microprocessor must provide a
periodic low-going signal on the ST input. Should the
processor fail to supply this signal within the selected
time-out period (150 ms, 600 ms or 1200 ms), an out-
of-control processor is indicated and the TC1232
issues a processor Reset as a result.
The outputs of the TC1232 are immediately driven
active when the PB input is brought low by an external
push button switch or other electronic signal. When
connected to a push button switch, the TC1232
provides contact debounce.
The TC1232 is packaged in a space-saving 8-Pin PDIP
or SOIC package, a 16-Pin SOIC (wide) package and
requires no external components.
Package Types
8-Pin PDIP
PB RST 1
TD 2
TOL 3
GND 4
TC1232
8 VCC
7 ST
6 RST
5 RST
PB RST
TD
TOL
GND
8-Pin SOIC
16-Pin SOIC (Wide)
1
8 VCC
NC 1
2 7 ST PB RST 2
TCC11223322
NC 3
3
6 RST
TD 4
4
5 RST
NC 5
TOL 6
NC 7
GND 8
TC1232
16 NC
15 VCC
14 NC
13 ST
12 NC
11 RST
10 NC
9 RST
Device Features
Device
RST pin
Type
Pull-up Active
Resistor Level
RST pin
Trip Points
Type
Active (Max)
Level
Minimum
Reset
Active Time
(ms)
WDI Input
Typical
Timeouts (ms)
MR
Input
TC1232 Open-drain External Low Push-pull High 4.75V
250 150, 600 or Yes
or 4.5V
1200
2002-2014 Microchip Technology Inc.
DS20001370E-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC1232 Datasheet

Microprocessor Monitor

No Preview Available !

TC1232 pdf
TC1232
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Voltage on Any Pin (With Respect to GND)
...................................................... -0.3V to +5.8V
Operating Temperature Range:
C-Version ........................................ 0°C to +70°C
E-Version......................................-40°C to +85°C
Storage Temperature Range: ............-65°C to +150°C
† Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, TA = TMIN to TMAX; VCC = +4.0V to 5.5V.
Parameters
Sym. Min. Typ. Max. Units
Conditions
Supply Voltage
VCC 4.0 5.0
5.5
V
ST and PB RST Input High Level VIH 2.0 — VCC +0.3 V Note 1
ST and PB RST Input Low Level VIL
-0.3 —
+0.8
V
Input Leakage ST, TOL
IL
-1.0 —
+1.0 µA
Output Current RST
IOH -1.0 -12 — mA VOH = 2.4V
Current RST, RST
IOL 2.0 10
— mA VOL = 0.4V
Operating Current
ICC — 50 200 µA Note 2
VCC 5% Trip Point
VCCTP 4.50 4.62
4.74
V TOL = GND (Note 3)
VCC 10% Trip Point
VCCTP 4.25 4.37
4.49
V TOL = VCC (Note 3)
Capacitance Electrical Characteristics: Unless otherwise noted, TA = +25°C. (Note 4)
Input Capacitance ST, TOL
CIN — — 5 pF
Output Capacitance RST, RST COUT
7
pF
Note 1: PB RST is internally pulled up to VCC with an internal impedance of typically 40 k.
2: Measured with outputs open.
3: All voltages referenced to GND.
4: Ensured by design.
DS20001370E-page 2
2002-2014 Microchip Technology Inc.


Part Number TC1232
Description Microprocessor Monitor
Maker Microchip
Total Page 24 Pages
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