ADM8699 Ver la hoja de datos (PDF) - Analog Devices
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ADM8699 Datasheet PDF : 4 Pages
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ADM8698/ADM8699
PIN FUNCTION DESCRIPTIONS
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 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
VCC 1
VCC 2
GND 3
GND 4
ADM8698/
ADMO8699
TOP VIEW
(Not to Scale)
8 GND
7 RESET
6 NC (WDI)*
5 NC
*( ) ADM8699 ONLY
NC = NO CONNECT
16-Lead SOIC
GND 1
16 RESET
VCC
VCC
2
3
O
15 RESET
ATDOMP V8I6E9W8/
(ANoDt Mto8S6ca9l9e)
14
NC (WDO)*
GND 4
13 NC
TOP VIEW
NC 5 (Not to Scale) 12 NC
NC 6
11 NC (WDI)*
NC 7
10 NC
NC 8
9 GND
*( ) ADM8699 ONLY
NC = NO CONNECT
TYPICAL PERFORMANCE CURVES
A4 3.36 V
100
90
10
0%
1V
1V
500ms
Figure 1. RESET Output Voltage vs. VCC
230
220
210
200
190
180
170
–50
–30
–10
10
30
50
70
90
TEMPERATURE – °C
Figure 2. RESET Timeout Delay vs. Temperature
4.69
4.67
4.65
4.63
4.61
4.59
4.57
4.55
–60
–30
0
30
60
TEMPERATURE – °C
90
120
Figure 3. RESET Voltage Threshold vs. Temperature
REV. 0
–3–
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