CAT1832 datasheet(6/12 Pages) CATALYST

部件名	CAT1832

功能描述	5V and 3.3V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets

Download	12 Pages

Scroll/Zoom	100%

制造商	CATALYST [Catalyst Semiconductor]

网页	http://www.catalyst-semiconductor.com

标志

6 / 12 page

6

CAT1232LP/CAT1832

Doc. No. 25089, Rev. 0C

Characteristics subject to change without notice

WATCHDOG TIMER AND

ST

ST INPUT

A watchdog timer stops and restarts a microprocessor

that has stopped proper operation or become “hung”.

The watchdog performs this function by monitoring the

ST input. After the reset outputs go inactive the ST input

must be strobed with a high-to-low signal transition prior

to the minimum watchdog timeout period. However if the

ST input is not strobed with a high-to-low signal transi-

tion prior to a watchdog timeout the reset outputs will

become active for TRST reseting and restarting the

microprocessor. Once the resets return to the inactive

state the watchdog timer restarts the process.

The TD input allows the user to select from three

predetermined watchdog timeout periods. Always use

the minimum timeout period to determine the required

frequency of

ST high-to-low transitions and the maxi-

mum to determine the time prior to the reset outputs

becoming active.

ST pulse widths must be 20ns or

greater.

The watchdog timer cannot be disabled. It must be

strobed with a high-to-low signal transition to avoid a

watchdog timeout and subsequent reset.

Figure 6. Timing Diagram: Pushbutton Reset

VIH

VIL

VOH

VOL

RESET

PBRST

tPDLY

tPB

tRST

RESET

ST

Valid

Strobe

Valid

Strobe

Invalid

Strobe

tRST

tST

Note:ST is ignored whenever a reset is active.

tTD

(Min)

tTD

(Min)

Figure 4. CAT1832 Application Circuit:

Pushbutton Reset

Figure 7. Timing Diagram: Strobe Input

Figure 5. CAT1232LP Application Circuit: Watchdog Timer

PBRST

3.3V

1

VCC

TD

2

ST

TOL

CAT1832

µP

3

4

RESET

GND

8

7

6

5

RESET

I/O

PBRST

5V

1

10k

VCC

TD

2

ST

TOL

CAT1232LP

µP

Decoder

3

4

RESET

GND

8

7

6

5

RESET

MREQ

Address

Bus

RESET

e

g

a

t

l

o

V

D

T

l

e

v

e

L

)

s

m

(

d

o

i

r

e

P

t

u

o

-

e

m

i

T

g

o

d

h

c

t

a

W

N

I

ML

A

N

I

M

O

NX

A

M

D

N

G5

.

2

60

5

10

5

2

g

n

i

t

a

o

l

F0

5

20

0

60

0

1

V C

C

0

50

0

2

10

0

2

类似零件编号 - CAT1832

制造商	部件名	数据表	功能描述
Catalyst Semiconductor	CAT1832	117Kb / 9P	5V and 3.3V Supply Voltage Monitor and Reset Circuit
	CAT1832	867Kb / 28P	Catalyst Semiconductor
	CAT1832	944Kb / 12P	5V and 3.3V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets
ON Semiconductor	CAT1832	604Kb / 12P	5 V and 3.3 V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets Doc. No. MD-3018 Rev. F
Catalyst Semiconductor	CAT1832GL	117Kb / 9P	5V and 3.3V Supply Voltage Monitor and Reset Circuit

More results

类似说明 - CAT1832

制造商	部件名	数据表	功能描述
Catalyst Semiconductor	CAT1232	944Kb / 12P	5V and 3.3V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets
ON Semiconductor	CAT1232LP	604Kb / 12P	5 V and 3.3 V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets Doc. No. MD-3018 Rev. F
Micrel Semiconductor	MAX823	957Kb / 14P	Voltage Supervisor with Watchdog Timer and Manual Reset
Linear Technology	LTC1726	227Kb / 14P	Triple Supply Monitor and P Supervisor with Adjustable Reset and Watchdog Timer
	LTC1726	172Kb / 12P	Triple Supply Monitor and uP Supervisor with Adjustable Reset and Watchdog Timer
	LTC1726	178Kb / 12P	Triple Supply Monitor and 짰 Supervisor with Adjustable Reset and Watchdog Timer
Vishay Siliconix	SIP823	55Kb / 6P	5-Pin UP Reset Circuits with Watchdog Timer and Manual Reset Rev. B, 14-Jun-04
Linear Technology	LTC2930	179Kb / 12P	Confi gurable Six Supply Monitor with Adjustable Reset Timer, Manual Reset
Catalyst Semiconductor	CAT1232LP	117Kb / 9P	5V and 3.3V Supply Voltage Monitor and Reset Circuit
Linear Technology	LTC2930	169Kb / 12P	Confi gurable Six Supply Monitor with Adjustable Reset Timer, Manual Reset