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MAX1259CWE
MAX1259 Battery Manager
19-4638; Rev f. 4/94
AlAUfl1taLAlAl
MAX1259 Battery Manager
General Description
The MAX1259 battery manager provides backup-battery
switching for CMOS RAM, microprocessors, or other
low-power logic le. it automatically switches to the
backup battery when the primary power supply is inter-
rupted. Low-loss switches guarantee an input-to-output
differential of only 200mV while supplying 250mA from
the primary power supply or 15mA from the battery,
Battery discharge during shipping does not occur in the
MAX1259, since the backup battery can be discon-
nected by strobing the PST input.
A battery-fail output signal indicates when the backup
battery is below +2V, and a power-fail output signal
indicates when the primary power supply is low. The
MAX1259 monitors the backup battery, warns of impend-
ing power failures, and switches the memory to the
battery when failures occur. The MAX1259 is pin com-
patible with the DS1259, but consumes three times less
supply current. Commercial, extended and military
temperature range devices are available.
Applica tions
Battery Backup tor CMOS RAM
Uninterruptible Power Supplies
Computers
Controllers
Automotive Systems
Functional Diagram
Features
. Switches to Backup Battery if Power Fails
. Consumes Less than 100nA of Battery Current
' Power-Fail Output Signals Primary
Power-Supply Loss
. Battery Monitor Indicates Low Battery
. Battery Can Be Disconnected to Prevent
Discharge During Shipping
. Battery Automatically Reconnected when
Vcc is Applied
. Pin Compatible with the DS1259
. Supply Current Three Times Lower than DS1259
. Available in Extended-Industrial and Military
Temperature Ranges
Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX1V2590PE 0°C to o70''C 16 Plastic DIP
MAX12590WE 0'C to +70''C 16 Wide SO
MAX1259C/D (Y'C to +70“C Dice"
MAX1259EPE MO''C to +850 16 Plastic DIP
MAX1259EWE -40°C to +85"C 16 Wide so
MAX1259MJE -55'C to +1250 16 CERDIP
I Contact factory for dice specifications.
Pin Configuration
VCCi -
1r coo
td, l, _
A. r-,] -r- RESET
= I i OGIC RST
REF MAXIM
MAX7259
r" » BAT
-l- GND
IOP VlEW
NO d . V 125] Vcct
VEMi E IP] VCCi
- MAXIM
8* [E MAX1259 E NO
NC E Es] Vcco
BAT E El Vcco
HST E E "
GNU Ci] Col N C)
GND E -i] N c
DlP/SO
Maxim Integrated Products 1
Call to" free 1 -800-998-8800 for free samples or literature.
693 LXVW
MAX1259
MAX1259 Battery Manager
ABSOLUTE MAXIMUM RATINGS
Storage Temperature Range
T _ _ -55''C to +125"C
Lead Temperature (soldering, 10 sec) .............. +300"C
Voltage to Any Pin Relative to GND .......... -0.3V to +7.0V
Operating Temperature Ranges:
MAX1259C_ .................... _ ..... (YC to +700
MAX1259E_ ........................... -40''C to +85'C
MAX1259MJE .................. -55'C to +125°C
Stresses beyond those listed under 'Absolule Maxtmum Ratmgs'may cause permanent damage to the device, I hese are stress ratings only. and functional
operation of the devrce at these or any other conditions beyond those Indicated m the operational sections of the specifications IS not implied. Exposure to
absolute maxtmurn rating conditions for extended periods may affect demos reliability.
RECOMMENDED DC OPERATING CONDITIONS
(All Grades, TA = TMIN to TMAx. unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Primary PovVer Supply (Note l) VCCI 5.0 5.5 V
- _ T _ MAX12590 2.0 Vcc1+0.3
Input High Voltage (Note l) VlH V
MAX1259E/M 2.4 VCCI +0.3
Input Low Voltage (Note 1) VI, -0.3 _ 0.8 v
Battery Voltage (Note 2) VBATT Pin 2 2.5 3.0 3.7 V
Battery Output (Note 1) BAT Pin 5 VBAIT All V
DC ELECTRICAL CHARACTERISTICS
(Vcc = +4.5V10 +5 5V, All Grades, TA = TMIN to TMAx. unless otherwise noted.)
PARAMETER _ SYMBOL - CONDITIONS MIN TYP MAX UNITS
Leakage Current lLo -1.0 1.0 pA
Output Current. E, B-F (Note 3) IOH VOH = 2AN -1.0 mA
Output Current, E. ET: lot, VOL = 04V 4.0 mA
Input Supp1y Current (Note 4) ICCI 2.00 3.33 mA
Vcco Output Current lcco gage E tia - 0.2V 250 mA
1 .26 x 1.26 x
Power-Fail Trip Point (Notes 2, 5) VTP Pin 11 VBATT 1.26 x N/BATT VBATT V
- 250mV + 250mV
Battery-Fail Trip Point (Note 6) VBATTF Pin 3 (E detect) _ 2.0 . V
DC ELECTRICAL CHARACTERISTICS
(VCCI
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Vcco Output Current (Note 7) Iccoz $3120] 2: \1/3ATT -0.21/ 15 mA ;
- MAX1259C 100 nA I
Battery Leakage (Note 8) |BATT MAX1259E 150
MAX1259M 10 “A
T; Output Current (Note 9) IBATOUT Pin 5 100 “A
[MAXIM
