Rainbow-electronics DS1340 Manual do Utilizador descarregar pdf (Página 3)

DS1340

2-Wire RTC with Trickle Charger

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RECOMMENDED DC OPERATING CONDITIONS

= V

CC MIN

to V

CC MAX

, T

= -40°C to +85°C, unless otherwise noted. Typical values are at V

= 3.3V, T

= +25°C, unless

otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

DS1340-18

1.71

1.8

1.89

DS1340-3 2.7 3.0 3.3

Supply Voltage (Note 8) V

DS1340-33

2.97

3.3 5.5

Input Logic 1 (SDA, SCL) V

(Note 8)

0.7 x V

+ 0.3

Input Logic 0 (SDA, SCL) V

(Note 8)

-0.3 +0.3 x V

Supply Voltage, Pullup (FT/OUT)

(Note 8) 5.5 V

DS1340-18 1.3 3.7

DS1340-3 1.3 3.7

Backup Supply Voltage (Note 8)

BACKUP

DS1340-33 1.3 5.5

R1 (Notes 9, 10)

250

R2 (Note 11)

2000

Trickle-Charge Current-Limiting

Resistors

R3 (Note 12)

4000

Ω

DS1340-18

1.51

1.6

1.71

DS1340-3

2.45

2.6 2.7Power-Fail Voltage (Note 8) V

DS1340-33

2.70 2.88 2.97

Input Leakage (SCL, CLK) I

-1 +1 µA

I/O Leakage (SDA, FT/OUT) I

-1 +1 µA

> 2V; V

= 0.4V 3.0

SDA Logic 0 Output I

OLSDA

1.7V < V

< 2V; V

= 0.2 x V

3.0

> 2V; V

= 0.4V 3.0

1.7V < V

< 2V; V

= 0.2 x V

3.0

FT/OUT Logic 0 Output I

OLSQW

1.3V < V

< 1.7V; V

= 0.2x V

250 µA

DS1340-18 72 150

DS1340-3

108

200

Active Supply Current (Note 13) I

CCA

DS1340-33

192

300

µA

DS1340-18 60 100

DS1340-3 81 125Standby Current (Note 14) I

CCS

DS1340-33

100

150

µA

BACKUP

Leakage Current

BACKUPLKG

BACKUP

= 3.7V 100 nA

DC ELECTRICAL CHARACTERISTICS

= 0V, V

BACKUP

= 3.7V, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

BACKUP1

OSC ON, FT = 0 (Note 15)

800 1150

BACKUP2

OSC ON, FT = 1 (Note 15)

850 1250

Oscillator Current

BACKUP3

OSC ON, FT = 0, V

BACKUP

= 3.0V,

= +25°C (Notes 15, 16)

800 1000

BACKUP

Data-Retention Current

BACKUPDR

OSC OFF

25.0

100 nA

1 2 3 4 5 6 7 8 ... 11 12

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