Rainbow-electronics DS1374 Manual do Utilizador descarregar pdf (Página 4)

DS1374

C, 32-Bit Binary Counter Watchdog RTC with

Trickle Charger and Reset Input/Output

4 _____________________________________________________________________

AC ELECTRICAL CHARACTERISTICS

= V

CC MIN

to V

CC MAX

, T

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Fast mode

100

400

SCL Clock Frequency (Note 16) f

SCL

Standard mode 0 100

kHz

Fast mode 1.3

Bus Free Time Between STOP

and START Conditions

BUF

Standard mode 4.7

µs

Fast mode 0.6

Hold Time (Repeated) START

Condition (Note 17)

HD:STA

Standard mode 4.0

µs

Fast mode 1.3

Low Period of SCL Clock t

LOW

Standard mode 4.7

µs

Fast mode 0.6

High Period of SCL Clock t

HIGH

Standard mode 4.0

µs

Fast mode 0 0.9

Data Hold Time (Notes 18, 19)

HD:DAT

Standard mode 0 0.9

µs

Fast mode

100

Data Setup Time (Note 20)

SU:DAT

Standard mode

250

Fast mode 0.6

Start Setup Time t

SU:STA

Standard mode 4.7

µs

Fast mode 300

Rise Time of Both SDA and SCL

Signals (Note 16)

Standard mode

20 +

0.1C

B 1000

Fast mode 300

Fall Time of Both SDA and SCL

Signals (Note 16)

Standard mode

20 +

0.1C

300

Fast mode 0.6

Setup Time for STOP Condition

SU:STO

Standard mode 4.7

µs

C ap aci ti ve Load for E ach Bus Li ne

(Note 16) 400 pF

I/O C ap aci tance ( S D A, S C L) C

I/O

(Note 21) 10 pF

Pulse Width of Spikes That Must

be Suppressed by the Input Filter

Fast mode 30 ns

Pushbutton Debounce PB

(Figure 2)

250

Reset Active Time t

RST

(Figure 2)

250

Oscillator Stop Flag (OSF) Delay

OSF

(Note 22)

100

1 2 3 4 5 6 7 8 9 ... 14 15

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