BQ4802YPW datasheet(3/26 Pages) TI1

Part #	BQ4802YPW

Description	PARALLEL REAL-TIME CLOCK WITH CPU SUPERVISOR

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Manufacturer	TI1 [Texas Instruments]

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bq4802Y

bq4802LY

SLUS464C – AUGUST 2000 – REVISED JUNE 2002

www.ti.com

3

ELECTRICAL CHARACTERISTICS

(TA = 25°C, VCC(min) ≤ VCC ≤ VCC(max) unless otherwise noted)

INPUT SUPPLY

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ICC

Supply current

100% Minimum duty cycle,

CS = VIL,

II/O = 0 mA

5

9

mA

CS = VIH

3

ISB1

Standby supply current

CS = VCC – 0.2 V,

0 V

≤ VIN ≤ 0.2 V or VIN = VCC – 0.2 V

1.5

mA

ICCB

Battery operation supply current

VBC = 3 V, TA = 25°C,

No load at VOUT or CEOUT, II/O = 0 mA

0.3

0.5

µA

ILI

Input leakage current

VIN = VSS to VCC

–1

1

µA

ILO

Output leakage current

CS = VIH or OE = VIH or WE = VIL

–1

1

µA

VOUT(1)

Output voltage

IOUT = 80 mA,VCC > VBC

VCC-0.3

V

VOUT(2)

Output voltage

IOUT = 100 µA, VCC < VBC

VBC-0.3

V

VPFD

Power fail detect voltage

bq4802Y

4.30

4.37

4.5

V

VPFD

Power fail detect voltage

bq4802LY

2.4

2.53

2.65

V

VSO

Supply switch over voltage

VBC > V(PFD)

VPFD

V

VSO

Supply switch over voltage

VBC < V(PFD)

VBC

V

VRST

RST output voltage(1)

I(RST) = 4 mA

0.4

V

VINT

INT output voltage(1)

I(INT) = 4 mA

0.4

V

(1) RST and INT are open drain outputs.

WATCHDOG

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

I(WDIL)

Low-level watchdog input current

–50

–10

µA

I(WDIH)

High-level watchdog input current

20

50

µA

V(WDO)

WDO output voltage

ISINK = 4 mA

0.4

V

V(WDO)

WDO output voltage

ISOURCE = 2 mA

2.4

V

CRYSTAL SPECIFICATIONS (DT-26) OR EQUIVALENT)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

fO

Oscillation frequency

32.768

kHz

CL

Load capacitance

6

pF

TP

Temperature turnover point

20

25

30

°C

k

Parabolic curvature constant

–0.042

ppm/

°C

Q

Quality factor

40,000

70,000

R1

Series resistance

45

k

Ω

C0

Shunt capacitance

1.1

1.8

pF

C0/C1

Capacitance ratio

430

600

DL

Drive level

1

µW

∆f/f0

Aging (first year at 25

°C)

1

–

ppm

CAPACITANCE

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

II/O

Input/outputcapacitance

VOut = 0 V

7

pF

CI

Input capacitance

V = 0 V

5

pF

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