MAX6845UKD2+T Maxim Integrated, MAX6845UKD2+T Datasheet - Page 11

• Manufacturer Part Number: MAX6845UKD2+T
• Description: Supervisory Circuits NULL
• Manufacturer: Maxim Integrated
• Series: MAX6841, MAX6842, MAX6843, MAX6844, MAX6845r

Specifications of MAX6845UKD2+T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 0.9 V to 1.5 V
• Output Type: Active Low, Open Drain
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 0.15 ms
• Supply Voltage - Max: 1.8 V
• Chip Enable Signals: No
• Maximum Power Dissipation: 571 mW
• Power Fail Detection: No
• Supply Current (typ): 8.1 uA
• Supply Voltage - Min: 0.55 V

Microprocessors with bidirectional reset pins can inter-
face directly with the open-drain RST output options.
However, conditions might occur in which the push-pull
output versions experience logic contention with the
bidirectional reset pin of the µP. Connect a 10kΩ resis-
tor between RST and the µP’s reset I/O port to prevent
logic contention (Figure 5).
The MAX6730–MAX6735 µP supervisors are relatively
immune to short-duration falling V
es). Small glitches on V
MAX6730–MAX6735, preventing undesirable reset
pulses to the µP. The Typical Operating Characteristics
show Maximum Transient Duration vs. Reset Threshold
Figure 4. Watchdog Input/Output Timing Diagram (MR and WDO Connected)
RSTIN
V
V
WDO
CC
WDI
CC
RST
MR
1,
2
Interfacing to µPs with Bidirectional
Circuits with Independent Watchdog Output
(MIN)
V
Single-/Dual-/Triple-Voltage µP Supervisory
CC
Applications Information
______________________________________________________________________________________
V
TH
t
RP
Falling V
CC
_ are ignored by the
CC
< t
_ transients (glitch-
WD-L
CC
Reset Pins
Transients
< t
WD-S
> t
WD-S
Figure 5. Interfacing to µPs with Bidirectional Reset I/O
V
CC
t
MR
2
V
CC
1
V
V
t
RP
CC
CC
1
2
MAX6731
MAX6733
MAX6735
GND
RST
COMPONENTS
RESET TO
SYSTEM
OTHER
< t
WD-L
10kΩ
RESET
GND
µP
11