MAX1259CSLASHD datasheet(3/8 Pages) MAXIM

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(All grades, TA = +25°C, unless otherwise noted.) (Note 10)

(VCC = 4.0V to 5.5V, all grades, TA = +25°C, unless otherwise noted.)

Note 1: All voltages referenced to ground.

Note 2: Trip-point voltage for power-fail detect: VTP = 1.26 x VBATT. For 5% operation: VBATT = 3.7V max.

Note 3: 50pF load capacity.

Note 4: Measured with pins 3, 11, 12, 13, and open.

Note 5: VTP is the point at which PF is driven low.

Note 6: VBATTF is the point at which BF is driven low.

Note 7: ICCO2 may be limited by battery capacity.

Note 8: Battery leakage is the internal energy consumed by the MAX1259.

Note 9: See the Typical Operating Characteristics BAT Switch Drop vs. Battery Voltage graph.

Note 10: Guaranteed by design. Not tested.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Capacitance

CIN

Output Capacitance

COUT

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

VCCI Fall Time

300

µs

VCCI Rise Time

µs

Power-Down to PF Low

tPF

µs

PF High After Power-Up

tREC

100

µs

RST Pulse Width

RSTPW

NAME

FUNCTION

1, 4, 9, 10, 14

N.C.

No Connection. Make no connection to these pins.

VBATT

Backup Battery Input

Battery-Fail Output. BF is high for VCCI at or above VTP and the backup battery greater than 2V. If the

backup battery is below 2V or VCCI falls below VTP, BF will be driven low.

BAT

Battery Output. During normal operation, the BAT output supplies up to 1mA of continuous battery

current. In shipping mode, the BAT output is high impedance.

RST

Battery-Disconnect Input. The RST input is used to prevent battery discharge during shipping. Pulsing

the RST input disconnects the backup battery from the VCCO and BAT outputs.

7, 8

GND

Ground

Power-Fail Output. PF is high for VCCI greater than 1.26 x VBATT (VTP), indicating a valid VCCI voltage.

12, 13

VCCO

CMOS RAM is Powered from VCCO. The battery switchover circuit compares VCCI to the VBATT input,

and connects VCCO to whichever is higher.

15, 16

VCCI

+5V VCC Input

MAX1259

Battery Manager

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Capacitance

Pin Description

AC Electrical Characteristics

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