BQ4845S-A4TRG4 datasheet(11/22 Pages) TI

Part #	BQ4845S-A4TRG4

Description	Parallel RTC With CPU Supervisor

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Manufacturer	TI [Texas Instruments]

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11

DC Electrical Characteristics (TA =TOPR, VCCmin ≤ VCC ≤ VCCmax)

Symbol

Parameter

Minimum

Typical

Maximum

Unit

Conditions/Notes

ILI

Input leakage current

-

± 1

µAVIN =VSS to VCC

ILO

Output leakage current

-

± 1

µA

CS =VIH or OE =VIH or WE

=VIL

VOH

Output high voltage

2.4

-

V

IOH = -2.0 mA

VOHB

VOH, BC Supply

VBC- 0.3

-

V

VBC >VCC,IOH = -10

µA

VOL

Output low voltage

-

0.4

V

IOL = 4.0 mA

ICC

Operating supply current

-

12

25

mA

Min. cycle, duty = 100%,

CS =VIL,II/O = 0mA

ISB1

Standby supply current

-

3

-

mA

CS =VIH

ISB2

Standby supply current

-

1.5

-

mA

CS

≥ VCC - 0.2V,

0V

≤ VIN ≤ 0.2V,

or VIN

≥ VCC - 0.2V

VSO

Supply switch-over voltage

-

VBC

-V

ICCB

Battery operation current

-

0.3

0.5

µA

VBC =3V, TA = 25°C, no load

on VOUT or CEOUT

VPFD

Power-fail-detect voltage

4.55

4.62

4.75

V

bq4845

Power-fail-detect voltage

4.30

4.37

4.5

V

bq4845Y

VOUT1

VOUT voltage

VCC - 0.3V

-

V

IOUT = 100mA, VCC >VBC

VOUT2

VOUT voltage

VBC - 0.3V

-

V

IOUT = 100

µA, VCC <VBC

VRST

RST output voltage

-

0.4V

-

IRST = 4mA

VINT

INT output voltage

-

0.4V

-

IINT = 4mA

VWDO

WDO output voltage

-

0.4V

-

ISINK = 4mA

2.4

-

ISOURCE = 2mA

IWDIL

Watchdog input low current

-50

-10

-

µA

0<VWDI < 0.8V

IWDIH

Watchdog input high current

-

20

50

µA

2.2<VWDI <VCC

Notes:

Typical values indicate operation at TA = 25°C, VCC =5V.

RST and INT are open-drain outputs.

Crystal Specifications (DT-26 or Equivalent)

Symbol

Parameter

Minimum

Typical

Maximum

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/fO

Aging (first year at 25°C)

-

1

-

ppm

Aug. 1995

bq4845/bq4845Y

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