ADM8698/ADM8699

REV. 0

–3–

PIN FUNCTION DESCRIPTIONS

Mnemonic

Function

+5 V Power Supply Input.

GND

0 V. Ground reference for all signals.

RESET

Logic Output.

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 ADM8699 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 CONFIGURATIONS

8-Lead DIP & SOIC

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

O

TOP VIEW

(Not to Scale)

ADM8698/

ADM8699

V

CC

V

CC

GND

GND

GND

NC (WDI)

*

NC

RESET

NC = NO CONNECT

16-Lead SOIC

1

2

3

4

16

15

14

13

TOP VIEW

(Not to Scale)

O

5

12

611

710

89

TOP VIEW

(Not to Scale)

ADM8698/

ADM8699

GND

V

CC

V

CC

GND

NC

NC

NC

NC

RESET

NC

NC

NC (WDI)

*

NC

GND

RESET

NC (WDO)

*

*( ) ADM8699 ONLY

NC = NO CONNECT

TYPICAL PERFORMANCE CURVES

10

90

100

0%

1V

A4

500ms

3.36 V

1V

TEMPERATURE –

°C

–50

90

–30

–10

10

30

50

70

230

170

200

220

210

190

180

Figure 2. RESET Timeout Delay vs. Temperature

TEMPERATURE –

°C

–60

–30

0

30

60

90

120

4.69

4.57

4.63

4.67

4.65

4.61

4.59

4.55

Figure 3. RESET Voltage Threshold vs. Temperature