MAX834EUK-T ,Micropower / Latching Voltage Monitors in SOT23-5Applications ______________Ordering InformationPrecision Battery MonitorTEMP. PIN- SOTPARTLoad Swit ..
MAX834EUK-T ,Micropower / Latching Voltage Monitors in SOT23-5ELECTRICAL CHARACTERISTICS(V = +2.5V to +11V, T = T to T , unless otherwise noted. Typical values a ..
MAX835EUK ,Micropower, Latching Voltage Monitors in SOT23-5Applications Ordering InformationPrecision Battery MonitorsPART PIN-PACKAGE TOP MARKLoad Switching5 ..
MAX835EUK-T ,Micropower / Latching Voltage Monitors in SOT23-5FeaturesThe MAX834/MAX835 micropower voltage monitors' Prevents Deep Discharge of Batteriescontain ..
MAX836EUS ,4-Pin Micropower Voltage MonitorsGeneral DescriptionThe MAX836/MAX837 micropower voltage monitors♦ ±1.25% Precision Voltage Threshol ..
MAX836EUS+T ,4-Pin Micropower Voltage MonitorsFeatures______________
MB81C81A-35 ,CMOS 256K-BIT HIGH-SPEED SRAMMay 1990 00
Edition1.0 FUJITSU
M38 1 C8 1A-25/-35
CMOS 256K-BI T HIGH-SPEED SRAM
256K Words ..
MB81F643242C-10FN ,4 x 512K x 32 bit synchronous dynamic RAMFUJITSU SEMICONDUCTORADVANCED INFO. AE0.1EDATA SHEETMEMORYCMOS4 · 512 K · 32 BITSYNCHRONOUS DYNAMIC ..
MB81F643242C-10FN ,4 x 512K x 32 bit synchronous dynamic RAMfeatures a fully synchronous operation referenced to a positive edge clock whereby all operations a ..
MB81N643289-60FN ,8 x 256K x 32 bit double data rate FCRAMapplications where large memory density and high effective bandwidth arerequired and where a simple ..
MB8264A-10 , MOS 65536-BIT DYNAMIC RANDOM ACCESS MEMORY
MB8264A-10 , MOS 65536-BIT DYNAMIC RANDOM ACCESS MEMORY
MAX834EUK-T-MAX835EUK-T
Micropower / Latching Voltage Monitors in SOT23-5
_______________General DescriptionThe MAX834/MAX835 micropower voltage monitors
contain a 1.204V precision bandgap reference, com-
parator, and latched output in a 5-pin SOT23 package.
Using the latched output prevents deep discharge of
batteries. The MAX834 has an open-drain, N-channel
output driver, while the MAX835 has a push/pull output
driver. Two external resistors set the trip-threshold
voltage.
The MAX834/MAX835 feature a level-sensitive latch,
eliminating the need to add hysteresis to prevent oscil-
lations in battery-load-disconnect applications.
________________________ApplicationsPrecision Battery Monitor
Load Switching
Battery-Powered Systems
Threshold Detectors
____________________________FeaturesPrevents Deep Discharge of BatteriesPrecision ±1.25% Voltage ThresholdLatched Output (once low, stays low
until cleared)SOT23-5 PackageLow CostWide Operating Voltage Range, +2.5V to +11V<2µA Typical Supply CurrentOpen-Drain Output (MAX834)
Push/Pull Output (MAX835)
MAX834/MAX835
Micropower, Latching Voltage Monitors
in SOT23-5
__________________Pin Configuration
__________Typical Operating Circuit19-1157; Rev 0; 12/96
MAX834/MAX835
Micropower, Latching Voltage Monitors
in SOT23-5
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +2.5V to +11V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCC, OUT(MAX834), CLEAR to GND......................-0.3V to 12V
IN, OUT(MAX835), to GND........................-0.3V to (VCC+0.3V)
INPUT Current
VCC.................................................................................20mA
IN.....................................................................................10mA
OUTCurrent.......................................................................-20mA
VCC Rate of Rise .............................................................100V/ms
Continuous Power Dissipation
SOT23-5 (derate 7.1mW/°C above +70°C)..................571mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX834/MAX835
Micropower, Latching Voltage Monitors
in SOT23-5
ELECTRICAL CHARACTERISTICS (continued)(VCC= +2.5V to +11V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Note 1:The voltage-detector output remains in the correct state for VCCdown to 1.2V when VIN≤VCC/ 2.
Note 2:Supply current has a monotonic dependence on VCC(see Typical Operating Characteristics).
Note 3:IN leakage current has a monotonic dependence on VCC(see Typical Operating Characteristics).
Note 4:The MAX834 open-drain output can be pulled up to a voltage greater than VCC, but may not exceed 11V.
__________________________________________Typical Operating Characteristics(VCC= +5V, Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
INPUT LEAKAGE CURRENT
vs. TEMPERATURE
MAXMAX834/835-07
TEMPERATURE (°C)
INPUT LEAKAGE CURRENT (nA)
INPUT LEAKAGE CURRENT
vs. INPUT VOLTAGE
MAXMAX834/835-08
VIN (V)
INPUT LEAKAGE CURRENT (nA)567
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAXMAX834/835-10
VCC (V)
SUPPLY CURRENT (567
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX834/835-11
VIN (V)
SUPPLY CURRENT (
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAXMAX834/835-12
VIN (V)
SUPPLY CURRENT (567
PROGRAMMED TRIP VOLTAGE
vs. TEMPERATURE
MAXMAX834/835-13
TEMPERATURE (°C)
TRIP VOLTAGE (V)
4.8
MAX834/MAX835
Micropower, Latching Voltage Monitors
in SOT23-53489101112
MAX835
OUTPUT SHORT-CIRCUIT
SOURCE CURRENT vs. SUPPLY VOLTAGEMAXMAX834/835-18
VCC (V)
SHORT-CIRCUIT CURRENT (mA)567
SUPPLY VOLTAGE FALLING TO OUT
PROPAGATION DELAY vs. TEMPERATURE
MAXMAX834/835-19
TEMPERATURE (°C)
PROPAGATION DELAY (
MAX835
OUTPUT RISE TIME vs. SUPPLY VOLTAGE
MAXMAX834/835-20
VCC (V)
RISE TIME (ns)567
OUTPUT FALL TIME
vs. SUPPLY VOLTAGE
MAXMAX834/835-21
VCC (V)
FALL TIME (
s)5671
10k
100k
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
OUTPUT SINK CURRENT (mA)
OL
(mV)
MAXMAX834/835-23
10k
100k
MAX835
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
OUTPUT SOURCE CURRENT (mA)
CC
- V
(mV)
MAXMAX834/835-25
OUTPUT LOW VOLTAGE
vs. SUPPLY VOLTAGE
MAXMAX834/835-14
VCC (V)
(mV)567
MAX835
OUTPUT HIGH VOLTAGE
vs. SUPPLY VOLTAGE
MAXMAX834/835-15
VCC (V)
CC
- V
OH
(mV)567
OUTPUT SHORT-CIRCUIT
SINK CURRENT vs. SUPPLY VOLTAGE
MAXMAX834/835-17
VCC (V)
SHORT-CIRCUIT CURRENT (mA)567
_____________________________Typical Operating Characteristics (continued)(VCC= +5V, Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
MAX834/MAX835
Micropower, Latching Voltage Monitors
in SOT23-5
_____________________________Typical Operating Characteristics (continued)(VCC= +5V, Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
10k
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
OUTPUT SINK CURRENT (mA)
(mV)
MAXMAX834/835-27
10k
MAX835
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
OUTPUT SOURCE CURRENT (mA)
- V
(mV)
MAXMAX834/835-29
CLEAR TO OUT PROPAGATION DELAY
vs. TEMPERATURE
MAXMAX834/835-30
TEMPERATURE (°C)
PROPAGATION DELAY (
______________________________________________________________Pin Description
MAX834/MAX835
Micropower, Latching Voltage Monitors
in SOT23-5
_______________Detailed DescriptionThe 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 VCC, but less than 11V. The MAX835’s output is
push/pull and can both source and sink current.
Programming the Trip Voltage (VTRIP)Two external resistors set the trip voltage, VTRIP(Figure
2). VTRIPis the point at which the falling monitored volt-
age (typically VCC) causes OUTto go low. IN’s high
input impedance allows the use of large-value
resistors without compromising trip voltage accuracy. To
minimize current consumption, choose a value for R2
between 500kΩand 1MΩ, then calculate R1 as follows:
R1 = R2 [(VTRIP/ VTH) - 1]
where VTRIPis the desired trip voltage and VTHis the
threshold voltage (1.204V). The voltage at IN must be at
least 1V less than VCC.
Latched-Output OperationThe 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 (VMON) is above the pro-
grammed trip voltage (VTRIP) (as when the system bat-
tery is recharged or a fresh battery is installed), pulse
CLEAR low-high-low for at least 1µs to reset the output
latch (OUTgoes high). When VMONfalls below VTRIP,
OUTgoes low and remains low (even if VMONrises
above VTRIP), until CLEAR is pulsed high again with
VMON> VTRIP. Figure 3 shows the timing relationship
between VMON, OUT, and CLEAR.
Figure 3a. Timing Diagram
Figure 3b. Timing Diagram, CLEAR = VCC
