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參數(shù)資料
| 型號(hào)： | ADM699 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Microprocessor Supervisory Circuits |
| 中文描述： | 微處理器監(jiān)控電路 |
| 文件頁(yè)數(shù)： | 3/4頁(yè) |
| 文件大小： | 254K |
| 代理商： | ADM699 |
ADM698/ADM699
REV. 0
–3–
PIN FUNCTION DESCRIPTION
Mnemonic
Function
V
CC
GND
RESET
+5 V Power Supply Input.
0 V. Ground reference for all signals.
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.
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.
WDI
RESET
WDO
PIN CONFIGURATION (DIP)
1
2
3
4
8
7
6
5
(Not to Scale)
TOP VIEW
ADM698/
ADO
V
CC
V
CC
GND
GND
GND
NC (WDI)
*
NC
*
( ) ADM699 ONLY
RESET
PIN CONFIGURATION (SOIC)
1
2
3
4
16
15
14
13
(Not to Scale)
TOP VIEW
(Not to Scale)
O
5
12
6
11
7
10
8
9
ADM698/
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
R
Figure 3. RESET Voltage Threshold vs. Temperature
215
210
205
200
195
20
40
60
80
100
120
TEMPERATURE –
°
C
R
V
CC
= +5V
Figure 2. RESET Active Time vs. Temperature
10
90
100
1V
A4
500ms
3.36 V
1V
AAAAAA
Figure 1. RESET Output Voltage vs. V
CC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADM698 | Microprocessor Supervisory Circuits |
| ADM698AN | Microprocessor Supervisory Circuits |
| ADM698AQ | Microprocessor Supervisory Circuits |
| ADM698AR | Microprocessor Supervisory Circuits |
| ADM698SQ | Microprocessor Supervisory Circuits |
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