12

FN8164.1

September 15, 2005

Equivalent AC Test Circuit

Circuit #3 SPICE Macro Model

Guidelines for Calculating

Typical Values of Bus Pull-Up Resistors

DCP Wiper Current De-rating Curve

5V

1533

Ω

100pF

SDA Output

10pF

25pF

10pF

Macro Model

120

100

80

40

60

20

20

40

60

80 100 120

0

0

Bus Capacitance (pF)

Min.

Resistance

Max.

Resistance

=1.8k

Ω

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

Noise suppression time constant (glitch filter)

20

ns

10

Start condition setup time (for a repeated start condition)

4700

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

50

ns

11

Stop condition setup time

4700

ns

10 & 12

Bus free time prior to new transmission

4700

ns

10

Write cycle time (nonvolatile write operation)

10

ms

13

X9241A