MAX1259C/D Maxim Integrated, MAX1259C/D Datasheet

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MAX1259C/D

Manufacturer Part Number
MAX1259C/D
Description
Battery Management
Manufacturer
Maxim Integrated
Series
MAX1259r
Datasheet
The MAX1259 battery manager provides backup-battery
switching for CMOS RAM, microprocessors, or other
low-power logic ICs. 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 disconnect-
ed by strobing the RST input.
A battery-fail output signal indicates when the backup
battery is below +2V, and a power-fail output signal indi-
cates when the primary power supply is low. The
MAX1259 monitors the backup battery, warns of
impending power failures, and switches the memory to
the battery when failures occur. The MAX1259 is pin-
compatible with the DS1259, but consumes three times
less supply current. Commercial, extended, and military
temperature range devices are available.
19-4638; Rev 2; 11/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
V
V
CCI
BATT
Battery Backup for CMOS RAM
Uninterruptible Power Supplies
Computers
Controllers
Automotive Systems
REF
________________________________________________________________ Maxim Integrated Products
MAX1259
General Description
Functional Diagram
GND
Applications
RESET
LOGIC
V
RST
BAT
PF
BF
CCO
* Contact factory for dice specifications.
Devices in PDIP and SO packages are available in both leaded
and lead-free packaging. Specify lead free by adding the + sym-
bol at the end of the part number when ordering. Lead free not
available for CERDIP package.
MAX1259C/D
MAX1259CPE
MAX1259CWE
MAX1259EPE
MAX1259EWE
MAX1259MJE
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
V
Pin-Compatible with the DS1259
Supply Current Three Times Lower than DS1259
Available in Extended-Industrial and Military
Temperature Ranges
CC
PART
is Applied
TOP VIEW
V
BATT
GND
GND
N.C.
N.C.
BAT
RST
Battery Manager
1
2
3
4
5
6
7
8
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
Ordering Information
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
DIP/SO
MAX1259
Pin Configuration
16
15
14
13
12
11
10
9
PIN-PACKAGE
Features
16 Wide SO
16 Wide SO
16 CERDIP
N.C.
N.C.
V
V
V
V
N.C.
PF
CCI
CCI
CCO
CCO
16 PDIP
16 PDIP
Dice*
1

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MAX1259C/D Summary of contents

Page 1

... Battery Automatically Reconnected when V is Applied CC Pin-Compatible with the DS1259 Supply Current Three Times Lower than DS1259 Available in Extended-Industrial and Military Temperature Ranges PART MAX1259C/D MAX1259CPE Applications MAX1259CWE MAX1259EPE MAX1259EWE MAX1259MJE * Contact factory for dice specifications. Devices in PDIP and SO packages are available in both leaded and lead-free packaging ...

Page 2

Battery Manager ABSOLUTE MAXIMUM RATINGS Voltage on Any Pin (with respect to GND) ............-0.3V to +7.0V Operating Temperature Range C Suffix................................................................0°C to +70°C E Suffix .............................................................-40°C to +85°C M Suffix ..........................................................-55°C to +125°C Stresses beyond those listed under “Absolute Maximum ...

Page 3

CAPACITANCE (All grades +25°C, unless otherwise noted.) (Note 10) A PARAMETER SYMBOL Input Capacitance Output Capacitance AC ELECTRICAL CHARACTERISTICS (V = 4.0V to 5.5V, all grades +25°C, unless otherwise noted PARAMETER SYMBOL V Fall ...

Page 4

Battery Manager (T = +25°C, unless otherwise noted.) A SWITCH VOLTAGE DROP vs. LOAD CURRENT 200 V MODE +25°C A 150 V = +4.5V 100 CCI +5.0V CCI 100 150 200 ...

Page 5

V CCI +4.25V +3V PF BATTERY CURRENT Figure 1. Power-Down/Power-Up Conditions Detailed Description Battery Switchover and V Figure 2 shows a typical application for the MAX1259. CMOS RAM is powered from V switchover circuit compares V CC and connects V ...

Page 6

Battery Manager +5V V CCI RST V IL +5V V CCO +3V 0V +3V BAT 0V Figure 4. Reset Timing To achieve rated performance, the V connected to both V pins (pins 15 and 16). As well, ...

Page 7

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 © 2005 Maxim Integrated Products ...

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