TC1232COA713 - Microchip Technology

TC1232

Features

• Precision Voltage Monitor

- Adjustable +4.5V or +4.75V

• Reset Pulse Width – 250 msec minimum

• No Externa l Components

• Adjustable Watchdog Timer

- 150 msec, 600 msec or 1.2 sec

• Operating Voltage 4.0V to 5.5V

• Debounced Manual Reset Input for External

Override

Block Diagram

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 msec after VCC is

within tolerance to ensure a stable system start-up.

Microprocessor sanity is monitored by the onboard

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 msec, 600 msec or 1200 msec),

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 TC12 32 is packag ed in a space-s aving 8-Pin PDIP

or SOIC package, a 16-Pin SOIC (wide) package and

requires no external components.

Package Types

Device Features

–

VREF

–

Tolerance

Select

(5% or 10%)

TOL

VCC

Debounce

Watchdog

Timebase

Select

PB RST

TD Watchdog

Timer ST

Reset

Generator

Device

RST pin RST pin T rip Points

(Max)

Minimum

Reset

Active Tim e

(ms)

WDI Input

Typical

Timeouts (ms)

Input

Type Pull-up

Resistor Active

Level Type Active

Level

TC1232 Open-drain External Low Push-pull High 4.75V

or 4.5V 250 150, 600 or

1200 Yes

TC1232

RST

GND

TOL

PB RST

RST

VCC

RST

RSTGND

TOL

PB RST

RST

VCC PB RST VCC

NC NC

TOL

GND

TC1232

16-Pin SOIC (Wide)8-Pin PDI P 8-Pin SOIC

TC1232

Microprocessor Monitor

TC1232

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings†

Voltage on Any Pin (With Respect to GND)

......................................................-0.3V to +5.8V

Operati ng Temperatu r e 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 funct ional 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 dev ice reliability.

DC CHARACTERISTICS

Electrical Specifications: Unless oth erwise 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 RS T Input High Le vel 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

Operati ng Curren t 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 otherw ise noted, TA = +25°C. (Note 4)

Input Capa citance 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 kΩ.

2: Measured with outputs open.

3: All voltages referenced to GND.

4: Ensured by design.

TC1232

FIGURE 1-1: Rise Time, Fall Time and Reset Detected to Reset Active Timing Waveforms.

AC CHARACTERISTICS

Electrical Specifications: Unless oth erwise noted, TA = TMIN to TMAX; VCC = +4.0V to 5.5V.

Parameters Sym Min Typ Max Units Conditions

VCC Fall Time tF10 — — µs Note 1

VCC Rise Time tR0——µsNote 1

VCC Trip Point Detected

to RST High and RST Low tRPD — — 100 ns VCC falling

VCC Trip Point Detected

to RST High and RST Open tRPU 250 610 1000 ms VCC rising (Note 2)

Note 1: Ensured by design.

2: tR = 5 µs.

+4.75V

VCC

+4.25V

VCC

+4.25V

+4.75V

VCC = 5V

+4. 5 V (5% Tri p Point)

+4.25V (10% Trip Point)

RST

RST VOL

VOH

tRPD

VCC

4.6V (5% Trip Point)

4.5V(10% Trip Point)

RST

RST VOL

VOH

tRPU

Determined by

external Pull-up

resistor

Determined by

external Pull-u

resistor

TC1232

FIGURE 1-2: Push Button Reset and Watchdog Timer Reset Timing Waveforms.

AC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless oth erwise noted, TA = TMIN to TMAX; VCC = +4.0V to 5.5V.

Parameters Sym Min Typ Max Units Conditions

PB RST Pulse Width tPB 20 — — ms Note 1

PB RST Falling Edge Low to

Res et Active tPBD 1420ms

PB RST Rising Edge High to

Reset Inactive tRST 250 610 1000 ms

ST Pulse Width tST 20 — — ns

ST Time-out Period 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.

RST

VIL

tPB

RST

tPBD

VIH

tRST

PB RST

The debounced PB RST input ignores input pulses less

than 1 ms and is designed to recognize pulses of

20 ms or greater.

tST

ST tTD

RST (when tTD ≤ tTD (min)) “H”

RST

(when tTD(min) ≤ tTD ≤ tTD(max))

(when tTD ≥ tTD(max))

RST

RST (when tTD ≤ tTD(min)) “L”

RST

(when tTD(min) ≤ tTD ≤ tTD(max))

(when tTD ≥ tTD(max))

RST

TC1232

2.0 TYPICAL PERFORMANCE CURVES

Perf orma nce Graphs are no t available.

TC1232

3.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1: PIN FUNCTION TABLES

Pin No.

Symbol Pin

Type

Buffer/

Driver

Type Function

8-pin

PDIP,

SOIC

16-pin

SOIC

1 2 PB RST I ST Push-button Reset Input.

Input for a Manual Reset Switch. This input debounces (ignores) pulses

less than 1 ms in duration and is ensured to recognize inputs of 20 ms or

greater.

L = Manual Reset Switch is Active, Forc e RST/RST pins Active

H = Manual Reset Switc h is Ina ctive . State of RST/RST pi ns det ermine d by

other system conditions.

2 4 TD I ST Time Delay Input.

The voltage level on this input determines the watchdog timer time-out

period.

TD = 0V → tTD = 150 ms

TD = Open → tTD = 600 ms

TD = VCC → tTD = 1.2 sec

3 6 TOL I ST Tolerance Input.

TOL = GND, Max Voltage Trip Point (VCCTP) = 4.75V (5% tolerance)

TOL = VCC, Max Voltage Trip Point (VCCTP) = 4.5V (10% tolerance)

4 8 GND — P The ground reference for the device.

59RSTOPush

Pull Reset Output (Active-High)

Goes active (High) if one of these conditions occurs:

1. If VCC falls below the selected reset voltage threshold.

2. If PB RST pin is forced low.

3. If ST pin is not stro bed withi n the mini mum s electe d time-o ut period .

(see TD pin)

4. During power-up

611RST

O Open

Drain Reset Output (Active-Low)

Goes active (Low) if one of these conditions occurs:

1. If VCC falls below the selected reset voltage threshold.

2. If PB RST pin is forced low.

3. If ST pin is not stro bed withi n the mini mum s electe d time-o ut period .

(see TD pin)

4. During power-up

713 ST I ST Strobe Input

Input for Watchdog Timer. WDT period determined by state of TD pin

Falling Edge → Resets Watchdog Timer counter (no time-out)

815V

CC — P The positive supply (+5V) for the device.

— 1,3,5,

7,10,1

2,16

NC — — No internal connection.

TC1232

4.0 OPERATIONAL DESCRIPTION

4.1 Power Monitor

The TC1232 provides the function of warning the

processor of a power fai lure . When VCC is detected as

being below the voltage levels defined by the TOL pin,

the TC1232’s comparator outputs the RST and RST

signal s to a logic level tha t warns the syste m of an out-

of-tolerance power supply. The RST and RST signals

switch at a th reshold value of 4.5V i f T OL is tied to VCC,

and at a value of 4.75 volts if TOL is grounded. The

RST and RST signal s are hel d ac tiv e for a min im um 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.

FIGURE 4-1: Power-Down Slew Rate.

FIGURE 4-2: Power-up Slew Rate.

FIGURE 4-3: VCC Detect Reset Output

Delay (Power-Down).

FIGURE 4-4: VCC Detect Reset Output

Delay (Power-Up).

+4.75V

VCC

+4.25V

VCC

+4.25V

+4.75V

VCC = 5V

+4.5V (5% Trip Point)

+4.25V (10% Trip Point)

RST

RST VOL

VOH

tRPD

VCC SLEW RATE = 1.66 mV/µs (0.5V/300 µs)

VCC

4.6V (5% Trip Point)

4.5V(10% Trip Point)

RST

RST VOL

VOH

tRPU

TC1232

4.2 Push Button Reset Input

The debo unced man ual reset inpu t (PB RST) manu ally

forces the reset outputs into their active states.

Figure 4-5 shows a block diagram for using the

TC1232 with a push button switch.

Once PB RST has been low for a time tPBD (the push-

button delay time), the reset outputs go active. The

reset outputs remain in their active states for a

minimum of 250 ms after PB RST rises above VIH.

Figure 4-6 shows a waveform for the push button

switch input and the reset pins output.

A mechanical push button or active logic signal can

drive the P B RST input. The debounced input ignores

input pulses less than 1 ms and recognizes pulses of

20 ms or greater. No external pull-up resistor is

required because the PB RST input has an internal

pull-up to VCC of approximately 100 µ A. FIGURE 4-5: Push Button Reset and

Watchdog Timer.

FIGURE 4-6: Push Button Reset –

PB RST Input.

VCC

TOL

PB RST

GND

RST

ST I/O

Reset

+5V

TC1232

Microprocessor

RST

VIL

tPB

RST

tPBD

VIH

tRST

PB RST

The debounced PB RST input ignores input pulses less

than 1 ms and is designed to recognize pulses of

20 ms or greater.

TC1232

4.3 Watchdog Timer

When the ST input is not stimulated for a preset time

period, the watchdog timer function forces RST and

RST signals to the active state. The preset time period

is determined by the TD inputs to be 150 ms with TD

connected to ground, 600 ms with TD floating or

1200 ms with TD connected to VCC (typ.). The

watchdog timer starts timing-out from the set time

period as s oon as RST and R ST are inactive. If a hig h-

to-low transition occurs on the ST input pin prior to

time-out, the watchdog timer is reset and begins to

time-ou t again. If the watchdo g timer is allowed to time-

out, the RST and RST signals are driven to the active

state for 250 ms, minimum (Figure 4-7).

The software routine that strobes ST is critical. The

code must be in a section of software that is executed

frequently enough so the time between toggles is less

than the watchdog time-out period. One common

techniq ue controls the microprocessor I/O line from two

sectio ns of the p rogram. The sof tware migh t set the I/O

line high while operating in the Foreground mode and

set it low whi le in the Ba ckgro und or Interru pt mo des. If

both modes do not execute correctly, the watchdog

timer issues reset pulses.

tTD is the maximum elapsed time between ST high-to-

low transitions (ST is activated by falling edges only),

which will keep the watchdog timer from forcing the

reset outputs active for a time of tRST. tTD is a function

of the voltage at the TD pin, as tabulated below:

TABLE 4-1: WATCHDOG TIMER

PERIODS

Figure 4-7 shows a block diagram for using the

TC1232 with a PICmicro® MCU and the Watchdog

input.

FIGURE 4-7: Watchdog Timer.

Figure 4-8 shows the expected reset output pin wave-

forms depending on the period of the ST pin falling

edge and the state of the TD input pin.

FIGURE 4-8: Strobe Input.

4.4 Supply Monitor Noise Sensitivity

The TC1 232 is op timized for fa st resp onse to ne gative-

going changes in VDD. Systems with an inordinate

amount of electrical noise on VDD (such as systems

using relays) may require a 0.01 µF or 0.1 µF bypass

capacitor to reduce detection sensitivity. This capacitor

should b e installed as close to the TC12 32 as po ss ibl e

to keep the capacitor lead length short.

Condition

tTD

Min Typ Max

TD pin = 0V 62.5 ms 150 ms 250 ms

TD pin = Open 250 ms 600 ms 1000 ms

TD pin = VCC 500 ms 1200 ms 2000 ms

VCC

TOL GND

RST

RESET

+5V

TC1232

0.1

10 kΩ

I/O

PICmicro®

3-Terminal

Regulator

+5V

µF MCU

(example:

MCP1700)

tST

ST tTD

RST (when tTD ≤ tTD (min)) “H”

RST

(when tTD(min) ≤ tTD ≤ tTD(max))

(when tTD ≥ tTD(max))

RST

RST (when tTD ≤ tTD(min)) “L”

RST

(when tTD(min) ≤ tTD ≤ tTD(max))

(when tTD ≥ tTD(max))

RST

TC1232

5.0 PACKAGING INFORMATION

5.1 Package Marking Information

XXXXXXXX

XXXXXNNN

YYWW

8-Lead PDIP (300 mil) Examples:

8-Lead SOIC (150 mil) Examples:

XXXXXXXX

XXXXYYWW

NNN

TC1232

I/P256

0518

TC1232

COA0518

256

16-Lead SOIC (150 mil) Examples:

XXXXXXXXXXXXX

YYWWNNN

XXXXXXXXXXXXX

TC1232COE

0518256

XXXXXXXXXX

Legend: XX...X Customer-specific information

Y Year code (last digit of calendar year)

YY Year code (las t 2 digits of calendar year)

WW Week code (week of January 1 is week ‘01’)

NNN Alphanume ric trac ea bility code

Pb-free JEDEC designator for Matte Tin (Sn)

*This package is Pb-free. The Pb-f ree JEDEC designator ( )

can be found on the outer packaging for this package.

Note: In the event the fu ll Mic rochip part nu mber ca nnot be m arked o n one lin e, it will

be carried over to the next line, thus limiting the number of available

characters for customer-specific information.

TC1232

CPA^^256

0518

TC1232E

OA^^0518

256

TC1232COE^^

0518256

XXXXXXXXXX

TC1232

8-Lead Plastic Dual In-line (PA) – 300 mil (PDIP)

Units INCHES* MILLIMETERS

Dime nsion Limits MIN NOM MAX MIN NOM MAX

Number of Pins n88

Pitch p.100 2.54

Top to Seating Plane A .140 .155 .170 3.56 3.94 4.32

Molded Package Thickness A2 .115 .130 .145 2.92 3.30 3.68

Base to Seating Plane A1 .015 0.38

Shoulder to Shoulder Width E .300 .313 .325 7.62 7.94 8.26

Molded Package Width E1 .240 .250 .260 6.10 6.35 6.60

Overall Length D .360 .373 .385 9.14 9.46 9.78

Tip to Seating Plane L .125 .130 .135 3.18 3.30 3.43

Lead Thickness c.008 .012 .015 0.20 0.29 0.38

Upper Lead Width B1 .045 .058 .070 1.14 1.46 1.78

Lower Lead Width B .014 .018 .022 0.36 0.46 0.56

Overall Row Spacing § eB .310 .370 .430 7.87 9.40 10.92

Mold Draft Angle Top α51015 51015

Mold Draft Angle Bottom β51015 51015

* Controlling Parameter

Notes:

Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed

JEDEC Equivalent: MS-001

Drawing No. C04-018

.010” (0.254mm) per side.

§ Significant Characteristic

TC1232

8-Lead Plastic Small Outline (OA) – Narrow , 150 mil (SOIC)

Foot A ngle φ048048

1512015120

Mold Draft Angle Bottom 1512015120

Mold Draft Angle Top 0.510.420.33.020.017.013BLead Width 0.250.230.20.010.009.008

Lead Thickness

0.760.620.48.030.025.019LFoot Length 0.510.380.25.020.015.010hChamfer Distance 5.004.904.80.197.193.189DOverall Length 3.993.913.71.157.154.146E1Molded Pa ckag e Width 6.206.025.79.244.237.228EOverall Width 0.250.180.10.010.007.004

Standoff § 1.551.421.32.061.056.052A2Molded Packag e Thickness 1.751.551.35.069.061.053AOverall Height 1.27.050

Pitch 88

Numb er of Pin s MAXNOMMINMAXNOMMINDimension Limits MILLIMETERSINCHES*Units

45°

* Controlling Parameter

Notes:

Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed

.010” (0.254mm) per side.

JEDEC Equivalent: MS-012

Drawing No. C04-057

§ Significant Characteristic

TC1232

16-Lead Plastic Small Outline (OE) – Wide, 300 mil (SOIC)

Foot Angle φ048048

1512015120

Mold Draft Angle Bottom 1512015120

Mold Draft Angle Top 0.510.420.36.020.017.014BLead Width 0.330.280.23.013.011.009

Lead Thickness

1.270.840.41.050.033.016LFoot Length 0.740.500.25.029.020.010hChamfer Distance 10.4910.3010.10.413.406.398DOverall Length 7.597.497.39.299.295.291E1Molded Package Width 10.6710.3410.01.420.407.394EOverall Width 0.300.200.10.012.008.004A1Standoff § 2.392.312.24.094.091.088A2Molded Package Thickness 2.642.502.36.104.099.093AOverall Height 1.27.050

Pitch 1616

Number of Pin s MAXNOMMINMAXNOMMINDimen sion Li mits MILLIMETERSINCHES*Units

45°

* Controlling Parameter

Notes:

Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed

.010” (0.254mm) per side.

JEDEC Equivalent: MS-013

Drawing No. C04-102

§ Significant Characteristic

TC1232

NOTES:

TC1232

APPENDIX A: REVISION HISTORY

Revision C (June 2005)

The following is the list of modifications:

1. Since no data is given in Section 2.0 “Typical

Performance Curves”, “Preliminary” was

added to the bottom of this document.

2. Corrected Operating Voltage in the Electrical

Specifications

3. General Data Shee t Enhancements

4. A dded Revi sion History Appendix Section

Revision B (March 2003)

• Not logged

Revision A (March 2002)

• Original Rel ease of this Document.

TC1232

NOTES:

TC1232

PRODUCT IDENTIFICATION SYSTEM

To order or obtain inform ation, e.g., on pricing or delivery, refer to the factory or the listed sales office.

Device: TC1232: Microprocessor Monitor

Temperature Range: C = 0°C to +70°C

E = -40°C to +85°C

Package: PA = Plastic DIP (300 mil Body), 8-lead

OA = Plastic SOIC, (150 mil Body), 8-lead

OA713 = Plastic SOIC, (150 mil Body), 8-lead

Tape and Reel

OE = Plastic SOIC (300 mil Body), 16-lead

OE713 = Plastic SOIC (300 mil Body), 16-lead

Tape and Reel

PART NO. X/XX

PackageTemperature

Range

Device

Examples:

a) TC1232COA: 0°C to +70°C, 8L-SOIC

b) TC1232COA713 : 0°C to +70°C, 8L- SOIC,

Tape and Reel

c) TC1232COE : 0°C to +70° C, 16L-SOIC

d) TC1232COE713 : 0°C to +70°C, 16L -SOIC

Tape and Reel

e) TC1232CPA: 0° C to +70°C, 8L-PDIP

f) TC1232EOA: -40°C to +85°C,

8L-SOIC

g) TC1232EOA713: -40°C to +85°C,

8L-SOIC,

Tape and Reel

h) TC1232EOE: -40°C to +85°C,

16L-SOIC

i) TC1232EOE713: -40°C to +85°C,

16L-SOIC,

Tape and Reel

j) TC1232EPA: -40°C to +85°C,

8L-PDIP

TC1232

NOTES:

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

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RELATED TO THE INFORMATION, INCLUDING BUT NOT

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Microchip disclaims all liability arising from this information and

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written approval by Microchip. No licenses are conveyed,

implicitly or otherwise, under any Microchip intellectual property

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PICSTA RT, PRO MAT E, PowerSmart, rfP IC, a nd

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All other trademarks mentioned herein are property of their

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Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

ASIA/PACIFIC

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100

Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8676-6200

Fax: 86-28-8676-6599

China - Fuzhou

Tel: 86-591-8750-3506

Fax: 86-591-8750-3521

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

China - Shunde

Tel: 86-757-2839-5507

Fax: 86-757-2839-5571

China - Qingdao

Tel: 86-532-502-7355

Fax: 86-532-502-7205

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-2229-0061

Fax: 91-80-2229-0062

India - New Delhi

Tel: 91-11-5160-8631

Fax: 91-11- 5160-8632

Japan - Kanagawa

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

Korea - Seoul

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Malaysia - Penang

Tel:011-604-646-8870

Fax:011-604-646-5086

Philippines - Manila

Tel: 011-632-634-9065

Fax: 011-632 -634-9069

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Taiwan - Hsinchu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

EUROPE

Austria - Weis

Tel: 43-7242-2244-399

Fax: 43-7242-2244-393

Denmark - Ballerup

Tel: 45-4450-2828

Fax: 45-4485-2829

France - Massy

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

Germany - Ismaning

Tel: 49-89-627-144-0

Fax: 49-89-627-14 4-44

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

England - Berkshire

Tel: 44-118-921-5869

Fax: 44-118-921-5820

WORLDWIDE SALES AND SERVICE

04/20/05