Rainbow-electronics DS1846 Manual do Utilizador descarregar pdf (Página 14)

DS1846

14 of 16

AC ELECTRICAL CHARACTERISTICS (-40

C to 85

C, Vcc=2.7V to 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

SCL clock frequency f

SCL

400

100

kHz *,6

Bus free time between

STOP and START

condition

BUF

1.3

4.7

µs

*,6

Hold time (repeated)

START condition

HD:STA

0.6

4.0

µs

*,7,6

Low period of SCL

clock

LOW

1.3

4.7

µs

*,6

High period of SCL

clock

HIGH

0.6

4.0

µs

*,6

Data hold time t

HD:DAT

0.9

µs

*,6,8,9

Data set-up time t

SU:DAT

100

250

ns *,6

Rise time of both SDA

and SCL signals

20+0.1C

300

1000

ns *,10

Fall time of both SDA

and SCL signals

20+0.1C

300

ns *,10

Set-up time for STOP

condition

SU:STO

0.6

4.0

µs

Capacitive load for each

bus line

400 pF 10

EEPROM write time T

5ms11

PBRST = V

150 ns

Reset Active Time t

RST

130 205 285 ms

Detect to RST and

RST

RPD

Slew Rate t

Pulse width of spikes

which must be

suppressed by the input

filter

Fast Mode 0 50 ns

Detect to RST and

RST

RPU

130 205 285 ms 22

Slew Rate t

0ns

PBRST Stable Low to

RST and

RST

PDLY

250 ns

VIN Detect to NMI

IPD

* fast mode

** standard mode

1 2 ... 9 10 11 12 13 14 15 16

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