DS1260-25 [DALLAS]

Smart Battery; 智能电池


型号：	DS1260-25
厂家：	DALLAS SEMICONDUCTOR
描述：	Smart Battery 智能电池电池
文件：	总8页 (文件大小：275K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DS1260

Smart Battery

www.dalsemi.com

FEATURES

PIN ASSIGNMENT

ꢀ Encapsulated lithium energy cell with shelf

life beyond 10 years

ꢀ Available with energy capacities of 250, 500,

and 1,000 mAH @ 3 volts

ꢀ Plugs into a standard 16-pin DIP socket

ꢀ Lithium cell electrically disconnects from

exposed pins upon command

ꢀ Battery isolation ensures full capacity after

shipping and handling

ꢀ Lithium cell automatically reconnects when

V_CCis applied

See Mech. Drawings Section

ꢀ Recessed pins prevent bending

ꢀ V_CCfail signal interrupts processor or write-

protects memory

ꢀ Exhausted energy cell warning signal

ꢀ Low profile permits mounting on 0.5-inch

printed circuit board centers

ꢀ Mates directly with DS1212 Nonvolatile

Controller to back up 16 SRAMs

ꢀ Uninterruptible supply for CMOS and

portable devices

PIN DESCRIPTION

Pins 1, 2, 4, 7, 9, 10 and 14 are No-Connects

Pin 3 is Battery Fail ( BF )

Pin 5 is Battery Out (BAT)

Pin 6 is RESET (RST) Input

Pin 8 is Ground

Pin 11 is Power Fail ( PF )

Pins 12 and 13 are RAM Supply (V_CCO

)

Pins 15 and 16 are +5V Supply (V_CCI

)

DESCRIPTION

The DS1260 SmartBattery is a low-cost, backup energy supply for portable and nonvolatile electronic

equipment. A lithium energy source of up to 1 amp hour can supply power to CMOS electronic circuits

when primary power is lost through an intelligent and efficient switch. When power is supplied from the

lithium power source, the power fail signal is held low to warn electronic (RESET) circuits of the power

status. Energy loss during shipping and handling is avoided by pulsing RESET, thereby causing the

backup energy source to be isolated from the exposed pins. The DS1260 can be plugged into a standard

16-pin, low-cost DIP socket, allowing for proven interconnect and simple replacement if the energy has

been exhausted.

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111999

DS1260

OPERATION

During normal operation V_CCI(pins 15 and 16) is the primary energy source and power is supplied to

V_CCO(pins 12 and 13) through an internal switch at a voltage level of V_CCI-0.2 volts @ 250 mA. During

this time the power-fail signal ( PF ) is held high, indicating valid primary voltage (see Figure 1).

However, if the V_CCIfalls below the level of 4.25 volts, the power-fail signal is driven low. As V_CCIfalls

below the level of the lithium supply (V_BAT= 3 volts), power is switched and the lithium energy source

supplies power to the uninterruptible output (V_CCO) at V_BAT-0.2 volts @ 5 mA.

On power-up, as the V_CCIsupply rises above 3 volts, the primary energy source, V_CCI, becomes the

supply. As the V_CCIinput rises above 4.25 volts, the power-fail signal is driven back to the high level.

During normal operation, BAT (Pin 5) stays at the battery level of 3 volts, regardless of the level of V_CCI

BATTERY FAIL

When power is being supplied from the primary energy source, BF (Pin 3) is held at a high level (V_OH),

provided that the lithium energy source is greater than 2 volts. If the lithium energy source should

decrease to below 2 volts, the BF signal is driven low (V_OL), indicating an exhausted lithium battery. The

BF signal is always low when power is being supplied by the lithium energy source.

RESET

The reset input can be used to prevent the lithium energy source from supplying power to V_CCOand BAT

even if V_CCIfalls below 3 volts. This feature is activated by applying a pulsed input on RST to a high

level (V_IH) for 50ns minimum while primary power is valid (see Figure 2). When primary power is

removed after pulsing RST, the V_CCOoutput and BAT will go to high impedance. The next time primary

power is applied such that V_CCIis greater than V_BAT, normal operation resumes and V_CCOwill be supplied

by the lithium energy source when V_CCIagain falls below 3 volts. BAT will also return to the level V_BAT

Figure 3 shows how the SmartBattery is used in a system application.

BLOCK DIAGRAM Figure 1

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DS1260

BATTERY PERFORMANCE DS1260-25

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DS1260

BATTERY PERFORMANCE DS1260-50

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DS1260

BATTERY PERFORMANCE DS1260-100

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DS1260

Table 1

PART NO.

DS1260-25

DS1260-50

DS1260-100

CAPACITY

250 mAH

480 mAH

960 mAH

NOMINAL VOLTAGE

3 volts

RESET TIMING Figure 2

INTEGRATED BATTERY BACKUP – APPLICATIONS Figure 3

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DS1260

ABSOLUTE MAXIMUM RATINGS*

Voltage on Any Pin Relative to Ground

Operating Temperature

-0.3V to +7.0V

0°C to 70°C

Storage Temperature

Soldering Temperature

-40°C to +70°C

260°C for 10 seconds

* This is a stress rating only and functional operation of the device at these or any other conditions

above those indicated in the operation sections of this specification is not implied. Exposure to

absolute maximum rating conditions for extended periods of time may affect reliability.

RECOMMENDED DC OPERATING CONDITIONS

(0°C to 70°C)

PARAMETER

SYMBOL

V_CC

MIN

4.5

TYP

MAX

5.5

V_CCI+0.3

+0.8

UNITS NOTES

Primary Power Supply

Input High Voltage

Input Low Voltage

5.0

V_IH

2.0

V_IL

-0.3

DC ELECTRICAL CHARACTERISTICS

(0°C to 70°C; V_CCI= 4.0 to 5.5V)

PARAMETER

SYMBOL

I_LO

MIN

-1.0

TYP

MAX

UNITS NOTES

Leakage Current

+1.0

µA

Output Current @ 2.4V

Output Current @ 0.4V

Input Supply Current

Pins 12, 13 V_CCO=V_CCI-0.2

I_OH

I_OL

I_CCI

I_CCO

V_TP

1, 2

+4.0

250

4.5

4.25

2.0

Pin 11 PF Detect

Pin 3 BF Detect

V_BATF

(0°C to 70°C; V_CCI< V_BAT)

Pin 5 Battery Voltage

Pins 12, 13 V_CCO=V_BAT-0.2

Battery Leakage

V_BAT

I_CCO2

I_BAT

µA

100

8, 9

Pin 5 Battery Output Current

I_BATOUT

CAPACITANCE

PARAMETER

Output Capacitance

Input Capacitance

(t_A= 25°C)

SYMBOL

MIN

TYP

MAX

UNITS NOTES

C_O

C_I

AC ELECTRICAL CHARACTERISTICS

(0°C to 70°C; V_CCI= 4.0 to 5.5V)

PARAMETER

V_CCISlew Rate

SYMBOL

MIN

300

TYP

MAX

UNITS NOTES

t_F

t_R

µs

t_PF

Power-Down to PF Low

PF High after Power-Up

t_REC

100

µs

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DS1260

POWER-DOWN/POWER-UP CONDITION

WARNING:

Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery

backup mode.

Water washing for flux removal may discharge internal lithium source as exposed voltage pins are

present.

NOTES:

1. Voltages are referenced to ground.

2. Load capacity is 50 pF.

3. Measured with Pins 11, 12, 13, and 3 open.

4. V_TPis the point that PF is driven low.

5. Sustained I_CCO2currents above 1 mA cause a significant drop in battery voltage.

6. V_BATis the internal lithium energy source voltage.

7. V_BATFis the point that BF is driven low.

8. Battery leakage is the internal energy consumed by the DS1260.

9. Storage loss is less than 1% per year at 25°C.

10. V_CCI= +5 volts; t_A= 25°C.

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