Rainbow-electronics DS1338 Manual do Utilizador descarregar pdf (Página 3)

DS1338 I

2

C RTC with 56-Byte NV RAM

3 of 15

DC ELECTRICAL CHARACTERISTICS

(V

CC

= 0V, T

A

= -40°C to +85°C.) (Note 1)

PARAMETER SYMBOL MIN TYP MAX UNITS

V

BAT

Current (OSC ON); V

BAT

= 3.7V, SQW/OUT OFF (Note 7) I

BATOSC1

400 1200 nA

V

BAT

Current (OSC ON); V

BAT

= 3.7V, SQW/OUT ON (32kHz)

(Note 7)

I

BATOSC2

570 1400 nA

V

BAT

Data-Retention Current (Osc Off); V

BAT

= 3.7V (Note 7) I

BATDAT

10 100 nA

AC ELECTRICAL CHARACTERISTICS

(T

A

= -40°C to +85°C) (Note 1)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

Fast mode 100 400

SCL Clock Frequency f

SCL

Standard mode 100

kHz

Fast mode 1.3

Bus Free Time Between STOP

and START Condition

t

BUF

Standard mode 4.7

ms

Fast mode 0.6

Hold Time (Repeated) START

Condition (Note 8)

t

HD:STA

Standard mode 4.0

ms

Fast mode 1.3

LOW Period of SCL Clock t

LOW

Standard mode 4.7

ms

Fast mode 0.6

HIGH Period of SCL Clock t

HIGH

Standard mode 4.0

ms

Fast mode 0.6

Setup Time for Repeated

START Condition

t

SU:STA

Standard mode 4.7

ms

Fast mode 0 0.9

Data Hold Time (Notes 9, 10) t

HD:DAT

Standard mode 0

ms

Fast mode 100

Data Setup Time (Note 11) t

SU:DAT

Standard mode 250

ns

Fast mode 20 + 0.1C

B

300

Rise Time of Both SDA and

SCL Signals (Note 12)

t

R

Standard mode 20 + 0.1C

B

1000

ns

Fast mode 20 + 0.1C

B

300

Fall Time of Both SDA and

SCL Signals (Note 12)

t

F

Standard mode 20 + 0.1C

B

300

ns

Fast mode 0.6

Setup Time for STOP

Condition

t

SU:STO

Standard mode 4.0

ms

Capacitive Load for Each Bus

Line

C

B

(Note 12) 400 pF

I/O Capacitance (SDA, SCL) C

I/O

(Note 13) 10

pF

Oscillator Stop Flag (OSF)

Delay

t

OSF

(Note 14) 100

ms

1 2 3 4 5 6 7 8 ... 14 15

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