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TC1232 데이터시트 PDF




Microchip에서 제조한 전자 부품 TC1232은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 TC1232 기능
기능 Microprocessor Monitor
제조업체 Microchip
로고 Microchip 로고


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TC1232 데이터시트, 핀배열, 회로
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




TC1232 pdf, 반도체, 판매, 대치품
TC1232
tPB
ST tST
tTD
PB RST
tPBD
RST
RST
VIL
VIH
tRST
RST (when tTD tTD (min))
RST
(when tTD(min) tTD tTD(max))
RST
(when tTD tTD(max))
The debounced PB RST input ignores input pulses less
than 1 ms and is designed to recognize pulses of
20 ms or greater.
RST (when tTD tTD(min))
RST
(when tTD(min) tTD tTD(max))
RST
(when tTD tTD(max))
FIGURE 1-2:
Push Button Reset and Watchdog Timer Reset Timing Waveforms.
AC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, TA = TMIN to TMAX; VCC = +4.0V to 5.5V.
Parameters
Sym. Min. Typ. Max. Units
Conditions
PB RST Pulse Width
PB RST Falling Edge Low to
Reset Active
tPB 20 —
tPBD
1
4
— ms Note 1
20 ms
PB RST Rising Edge High to
Reset Inactive
tRST 250 610 1000 ms
ST Pulse Width
ST Time-out Period
tST 20 — — ns
tTD 62.5 150 250 ms TD Pin = 0V
250 600 1000 ms TD Pin = Open
500 1200 2000 ms TD Pin = VCC
Note 1: PB RST must be held low for a minimum of 20 ms to ensure a Reset.
“H”
“L”
DS20001370E-page 4
2002-2014 Microchip Technology Inc.

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TC1232 전자부품, 판매, 대치품
4.0 OPERATIONAL DESCRIPTION
4.1 Power Monitor
The TC1232 provides the function of warning the
processor of a power failure. When VCC is detected as
being below the voltage levels defined by the TOL pin,
the TC1232’s comparator outputs the RST and RST
signals to a logic level that warns the system of an out-
of-tolerance power supply. The RST and RST signals
switch at a threshold value of 4.5V if TOL is tied to VCC,
and at a value of 4.75V if TOL is grounded. The RST
and RST signals are held active for a minimum of
250 ms to ensure that the power supply voltage has
been stabilized.
Figure 4-1 shows the VCC fall time.
Figure 4-2 shows the VCC rise time.
Figure 4-3 shows the time from when the voltage trip
point is detected to the Reset output pin going active.
Figure 4-4 shows the time from when the voltage trip
point is exited to the Reset output pin going inactive.
VCC
tF
+4.75V
+4.25V
FIGURE 4-1:
Power-Down Slew Rate.
tR
+4.75V
+4.25V
VCC = 5V
TC1232
+4.5V (5% Trip Point)
+4.25V (10% Trip Point)
RST
RST
tRPD
VOH
VOL
VCC SLEW RATE = 1.66 mV/µs (0.5V/300 µs)
FIGURE 4-3:
VCC Detect Reset Output
Delay (Power-Down).
4.6V (5% Trip Point)
4.5V(10% Trip Point)
VCC
RST
RST
tRPU
VOH
VOL
FIGURE 4-4:
VCC Detect Reset Output
Delay (Power-Up).
VCC
FIGURE 4-2:
Power-up Slew Rate.
2002-2014 Microchip Technology Inc.
DS20001370E-page 7

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