MAX6845 Maxim Integrated Products, MAX6845 Datasheet - Page 7

• Manufacturer Part Number: MAX6845
• Description: (MAX6841 - MAX6845) Ultra-Low-Voltage uP Reset Circuits and Voltage Detectors
• Manufacturer: Maxim Integrated Products

Figure 5. Using the MAX6842/MAX6845 Open-Drain RESET
Output with Multiple Supplies
Generally, the pullup connected to the MAX6842/
MAX6845 connects to the supply voltage being moni-
tored at the IC’s V
the open-drain output to level-shift from the monitored
supply to reset circuitry powered by some other supply
(Figure 5). Note that as the MAX6842/MAX6845’s V
decreases, so does the IC’s ability to sink current at
RESET. Also, with any pullup, RESET is pulled high as
V
depends on the pullup resistor value and the voltage to
which it is connected.
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CC
Using the MAX6842/MAX6845 Open-Drain
decays toward 0. The voltage where this occurs
MAX6845
MAX6842
RESET Output with Multiple Supplies
0.9V
V
GND
CC
RESET
Ultra-Low-Voltage µP Reset Circuits and
_______________________________________________________________________________________
CC
pin. However, some systems use
Chip Information
R
PULLUP
RESET
+5.0V
V
GND
µP
CC
CC
Table 1. Threshold Suffix Guide
Table 2. Active Timeout Period Guide
Table 3. Standard Versions
SUFFIX
D0
D1
D2
D3
D4
MAX6841HUKD0
MAX6841HUKD3
MAX6841DUKD0
MAX6841DUKD3
MAX6842HUKD0
MAX6842HUKD3
MAX6842DUKD0
MAX6842DUKD3
MAX6841FUKD0
MAX6841FUKD3
MAX6842FUKD0
MAX6842FUKD3
MAX6843UKD0
MAX6843UKD3
MAX6844UKD0
MAX6844UKD3
MAX6845UKD0
MAX6845UKD3
DEVICE
SUFFIX
Voltage Detectors
G
H
D
F
E
I
RESET ACTIVE TIMEOUT PERIOD (ms)
1120
MIN
140
20
—
1
RESET THRESHOLD (V)
1680
TYP
0.15
210
1.5
30
TOP MARK
AEDW
AEDQ
AEDN
AEDO
AEDU
1.388
1.313
1.110
1.050
0.833
0.788
AEDR
AEDS
AEDP
AEDX
AEDY
AEDV
AEDT
AEDZ
AEAV
AEEB
AEEC
AEAX
AEAY
MAX
2240
280
—
40
2
7