ADM698 Analog Devices, ADM698 Datasheet - Page 3

• Manufacturer Part Number: ADM698
• Description: Microprocessor Supervisory Circuit
• Manufacturer: Analog Devices

Specifications of ADM698

• # Of Monitored Voltages: 1
• Backup-battery Switch: No
• Manual Reset Capability: No
• Package: DIP,SOIC
• Reset Threshold Summary: 4.65V
• Reset Output-stage: Active-High/Push-Pull,Active-Low/Push-Pull
• Min Reset Timeout (ms): 140
• Watchdog Timer: No

REV. 0
TYPICAL PERFORMANCE CURVES
Mnemonic
V
GND
RESET
WDI
RESET
WDO
CC
Figure 1. RESET Output Voltage vs. V
Function
+5 V Power Supply Input.
0 V. Ground reference for all signals.
Logic Output. RESET goes low whenever V
falls below the reset voltage threshold (4.65 V
typ). RESET remains low for a minimum of
140 ms after V
goes low for a minimum of 140 ms if the watchdog
timer is enabled but not serviced within its time-
out period.
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.
(SOIC packages only) Logic Output. RESET is
an active high output. It is the inverse of RESET.
(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.
90
10
0%
100
PIN FUNCTION DESCRIPTION
1V
A4
3.36 V
1V
CC
returns to 5 V. RESET also
Figure 3. RESET Voltage Threshold vs. Temperature
500ms
4.68
4.66
4.64
4.62
4.70
20
V
CC
CC
= +5V
40
CC
TEMPERATURE –
60
–3–
POWER DOWN
POWER UP
80
°
C
Figure 2. RESET Active Time vs. Temperature
215
100
210
205
200
195
20
PIN CONFIGURATION (SOIC)
PIN CONFIGURATION (DIP)
GND
GND
V
V
CC
CC
GND
GND
120
V
V
NC
NC
NC
NC
CC
CC
40
1
2
3
4
1
2
3
4
5
6
7
8
*( ) ADM699 ONLY
*
( ) ADM699 ONLY
(Not to Scale)
(Not to Scale)
(Not to Scale)
(Not to Scale)
ADM698/
ADM699
ADM698/
TOP VIEW
TOP VIEW
ADM699
TOP VIEW
TOP VIEW
TEMPERATURE –
O
O
60
ADM698/ADM699
16
15
14
13
12
10
11
9
8
7
6
5
80
RESET
RESET
NC (WDO)
NC
NC
NC (WDI)
NC
GND
°
GND
NC (WDI)
NC
RESET
C
*
*
V
100
CC
*
= +5V
120