Datasheet

ADM698/ADM699
REV. 0
–3–
PIN FUNCTION DESCRIPTION
Mnemonic Function
V
CC
+5 V Power Supply Input.
GND 0 V. Ground reference for all signals.
RESET Logic Output. RESET goes low whenever V
CC
falls below the reset voltage threshold (4.65 V
typ).
RESET remains low for a minimum of
140 ms after V
CC
returns to 5 V. RESET also
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
V
CC
V
CC
GND
GND
GND
NC (WDI)
*
NC
* ( ) ADM699 ONLY
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
V
CC
V
CC
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
V
CC
= +5V
TEMPERATURE –
° C
RESET VOLTAGE THRESHOLD – V
Figure 3. RESET Voltage Threshold vs. Temperature
215
210
205
200
195
20
40 60 80 100 120
TEMPERATURE –
° C
RESET ACTIVE TIME – ms
V
CC
= +5V
Figure 2. RESET Active Time vs. Temperature
10
90
100
0%
1V
A4
500ms
3.36 V
1V
Figure 1. RESET Output Voltage vs. V
CC