參數(shù)資料
型號(hào): MAX6735KAZWD3-T
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 電源管理
英文描述: Single-/Dual-/Triple-Voltage &#181.P Supervisory Circuits with Independent Watchdog Output
中文描述: 3-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
封裝: SOT-23, 8 PIN
文件頁(yè)數(shù): 9/16頁(yè)
文件大小: 244K
代理商: MAX6735KAZWD3-T
Manual Reset Input
Many μP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on
MR
asserts the reset output, clears the watchdog timer,
and deasserts the watchdog output. Reset remains
asserted while
MR
is low and for the reset timeout peri-
od (t
RP
) after
MR
returns high. An internal 50k
pullup
resistor allows
MR
to be left open if unused. Drive
MR
with TTL or CMOS-logic levels or with open-drain/col-
lector outputs. Connect a normally open momentary
switch from
MR
to GND to create a manual reset func-
tion; external debounce circuitry is not required.
Connect a 0.1μF capacitor from
MR
to GND to provide
additional noise immunity when driving
MR
over long
cables or if the device is used in a noisy environment.
Adjustable Input Voltage (RSTIN)
The MAX6734/MAX6735 provide an additional high-
impedance comparator input with a 626mV threshold to
monitor a third supply voltage. To monitor a voltage
higher than 626mV, connect a resistive-divider to the
circuit as shown in Figure 2 to establish an externally
controlled threshold voltage, V
EXT_TH
.
V
= 626mV
EXT_TH
×
+
R
(
)
R
R
1
2
2
M
Single-/Dual-/Triple-Voltage μP Supervisory
Circuits with Independent Watchdog Output
_______________________________________________________________________________________
9
t
RP
t
RP
V
TH
V
CC
(MIN)
V
CC
1,
V
2
RSTIN
RST
WDO
MR
Figure 1.
RST
,
WDO
, and
MR
Timing Diagram
MAX6734
MAX6735
V
EXT_TH
GND
RSTIN
R1
R2
Figure 2. Monitoring a Third Voltage
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