ADM698 Просмотр технического описания (PDF) - Analog Devices
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ADM698 Datasheet PDF : 4 Pages
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PIN FUNCTION DESCRIPTION
Mnemonic Function
VCC
GND
RESET
WDI
RESET
WDO
+5 V Power Supply Input.
0 V. Ground reference for all signals.
Logic Output. RESET goes low whenever VCC
falls below the reset voltage threshold (4.65 V
typ). RESET remains low for a minimum of
140 ms after VCC 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.
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.
TYPICAL PERFORMANCE CURVES
A4 3.36 V
100
90
ADM698/ADM699
PIN CONFIGURATION (DIP)
VCC 1
VCC 2
GND 3
GND 4
ADM698/
ADMO699
TOP VIEW
(Not to Scale)
8 GND
7 RESET
6 NC (WDI)*
5 NC
*( ) ADM699 ONLY
PIN CONFIGURATION (SOIC)
GND 1
16 RESET
VCC
VCC
2
3
O
15
ATDOPMV6IE9W8/
(NAoDt tMo S6c9a9le)
14
RESET
NC (WDO)*
GND 4 TOP VIEW 13 NC
NC 5 (Not to Scale) 12 NC
NC 6
11 NC (WDI)*
NC 7
10 NC
NC 8
9 GND
*( ) ADM699 ONLY
215
VCC = +5V
210
205
10
0%
1V
1V
500ms
Figure 1. RESET Output Voltage vs. VCC
4.70
VCC = +5V
4.68
4.66
200
195
20
40
60
80
100
120
TEMPERATURE – °C
Figure 2. RESET Active Time vs. Temperature
POWER UP
4.64
POWER DOWN
REV. 0
4.62
20
40
60
80
100
120
TEMPERATURE – °C
Figure 3. RESET Voltage Threshold vs. Temperature
–3–
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