MAX834EUK+T Maxim Integrated Products, MAX834EUK+T Datasheet - Page 6

• Manufacturer Part Number: MAX834EUK+T
• Description: IC MONITOR VOLT LATCH SOT23-5
• Manufacturer: Maxim Integrated Products
• Type: Simple Reset/Power-On Resetr

Specifications of MAX834EUK+T

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 80 µs Typical Propagation Delay
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Undervoltage Threshold: 1.185 V
• Overvoltage Threshold: 1.215 V
• Manual Reset: No
• Watchdog: No
• Supply Voltage (max): 11 V
• Supply Voltage (min): 2.5 V
• Supply Current (typ): 5 uA
• Maximum Power Dissipation: 571 mW
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX834EUK+T; MAX834EUK+TTR

The MAX834/MAX835 micropower voltage monitors con-
tain a 1.204V precision bandgap reference and a com-
parator with an output latch (Figure 1). The difference
between the two parts is the structure of the comparator
output driver. The MAX834 has an open-drain, n-channel
output driver that can be pulled up to a voltage higher
than V
push-pull and can both source and sink current.
Two external resistors set the trip voltage, V
V
(typically V
impedance allows the use of large-value resistors without
compromising trip voltage accuracy. To minimize current
consumption, choose a value for R2 between 500kΩ and
1MΩ, then calculate R1 as follows:
Micropower, Latching Voltage Monitors
in SOT23-5
Figure 3a. Timing Diagram
Figure 3b. Timing Diagram, CLEAR = V
6
_______________Detailed Description
TRIP
_______________________________________________________________________________________
is the point at which the falling monitored voltage
Programming the Trip Voltage (V
CC
CLEAR
V
OUT
MON
, but less than 11V. The MAX835’s output is
CC
< V
> V
) causes OUT to go low. IN’s high input
R1 = R2 [(V
V
V
TRIP
TRIP
CC
0V
CC
0V
V
MON
OUT
> V
< V
V
TRIP
TRIP
CC
0V
TRIP
/ V
TH
CC
) - 1]
TRIP
(Figure 2).
TRIP
)
> 1µs
where V
threshold voltage (1.204V). The voltage at IN must be at
least 1V less than V
The MAX834/MAX835 feature a level-sensitive latch
input (CLEAR), designed to eliminate the need for hys-
teresis in battery undervoltage-detection applications.
When the monitored voltage (V
grammed trip voltage (V
tery is recharged or a fresh battery is installed), pulse
CLEAR low-high-low for at least 1µs to reset the output
latch (OUT goes high). When V
OUT goes low and remains low (even if V
above V
V
between V
MON
> V
TRIP
TRIP
TRIP
MON
> 1µs
), until CLEAR is pulsed high again with
is the desired trip voltage and V
. Figure 3a shows the timing relationship
, OUT, and CLEAR.
CC
Latched-Output Operation
.
TRIP
) (as when the system bat-
MON
> 1µs
MON
) is above the pro-
falls below V
MON
TH
is the
rises
TRIP
,