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ADM8698ARN Arkusz danych(PDF) 3 Page - Analog Devices

Numer części ADM8698ARN
Szczegółowy opis  Microprocessor Supervisory Circuits
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ADM8698/ADM8699
REV. 0
–3–
PIN FUNCTION DESCRIPTIONS
Mnemonic
Function
VCC
+5 V Power Supply Input.
GND
0 V. Ground reference for all signals.
RESET
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.
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
*( ) ADM8699 ONLY
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
Figure 1. RESET Output Voltage vs. VCC
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


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