12

FN8164.5

December 14, 2006

Guidelines for Calculating

Typical Values of Bus Pull-Up Resistors

DCP Wiper Current De-rating Curve

120

100

80

40

60

20

20 40 60

80 100 120

0

0

Bus Capacitance (pF)

Min.

Resistance

Max.

Resistance

7

6

5

3

4

1

20

40

60

70

80

90

0

0

Ambient Temperature (°C)

2

50

10

30

AC Electrical Specifications

(Over recommended operating conditions unless otherwise stated.)

SYMBOL

PARAMETER

LIMITS

UNIT

REFERENCE

FIGURE

MIN

MAX

SCL clock frequency

0

100

kHz

10

Clock LOW period

4700

ns

10

Clock HIGH period

4000

ns

10

SCL and SDA rise time

1000

ns

10

SCL and SDA fall time

300

ns

10

(9)

Noise suppression time constant (glitch filter)

20

ns

10

Start condition setup time (for a repeated start condition)

4000

ns

10 & 12

Start condition hold time

4000

ns

10 & 12

Data in setup time

250

ns

10

Data in hold time

0

ns

10

SCL LOW to SDA data out valid

3500

ns

11

Data out hold time

30

ns

11

Stop condition setup time

4000

ns

10 & 12

Bus free time prior to new transmission

4700

ns

10

Write cycle time (nonvolatile write operation)

10

ms

13

Wiper response time from stop generation

500

µs

13

Wiper response from SCL LOW

1000

µs

6

SCL

SDA

(Data in)

FIGURE 10. INPUT BUS TIMING

X9241A