ADM698/ADM699

REV. 0

–3–

PIN FUNCTION DESCRIPTION

Mnemonic

Function

+5 V Power Supply Input.

GND

0 V. Ground reference for all signals.

RESET

falls below the reset voltage threshold (4.65 V

typ). RESET remains low for a minimum of

goes low for a minimum of 140 ms if the watchdog

timer is enabled but not serviced within its time-

out period.

WDI

Watchdog Input. WDI is a three level input. If

WDI remains either high or low for longer than

the watchdog timeout period, RESET pulses low

and WDO goes low. The timer resets with each

transition on the WDI line. The watchdog timer

may be disabled if WDI is left floating or is driven

to midsupply.

RESET

(SOIC packages only) Logic Output. RESET is

an active high output. It is the inverse of RESET.

WDO

(SOIC ADM699 only) Logic Output. The

Watchdog Output, WDO, goes low if WDI

remains either high or low for longer than the

watchdog timeout period. WDO is set high by the

next transition at WDI. If WDI is unconnected or

at midsupply, the watchdog timer is disabled and

WDO

remains high.

PIN CONFIGURATION (DIP)

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

O

TOP VIEW

(Not to Scale)

ADM698/

ADM699

GND

GND

GND

NC (WDI)

*

NC

RESET

PIN CONFIGURATION (SOIC)

1

2

3

4

16

15

14

13

TOP VIEW

(Not to Scale)

O

5

12

6

11

710

89

TOP VIEW

(Not to Scale)

ADM698/

ADM699

GND

GND

NC

NC

NC

NC

RESET

NC

NC

NC (WDI)

*

NC

GND

RESET

NC (WDO)

*

*( ) ADM699 ONLY

TYPICAL PERFORMANCE CURVES

4.70

4.68

4.66

4.64

4.62

20

40

60

80

100

120

POWER UP

POWER DOWN

TEMPERATURE –

Figure 3. RESET Voltage Threshold vs. Temperature

215

210

205

200

195

20

40

60

80

100

120

TEMPERATURE –

Figure 2. RESET Active Time vs. Temperature

10

90

100

0%

1V

A4

500ms

3.36 V

1V