11/19

M24256-B, M24128-B

Table 9. AC Characteristics

Note: 1. For a reSTART condition, or following a write cycle.

2. Sampled only, not 100% tested.

3. To avoid spurious STAR T and STOP conditions, a minimum delay is placed between SCL=1 and the falling or rising edge of SDA.

4. This is preliminary data.

Symbol

Alt.

Parameter

M24256-B / M24128-B

Unit

4

Min

Max

Min

Max

Min

Max

Clock Rise Time

300

300

300

ns

Clock Fall Time

300

300

300

ns

SDA Rise Time

20

300

20

300

20

300

ns

SDA Fall Time

20

300

20

300

20

300

ns

Clock High to Input Transition

600

600

600

ns

Clock Pulse Width High

600

600

600

ns

Input Low to Clock Low (START)

600

600

600

ns

Clock Low to Input Transition

0

0

0

µs

Clock Pulse Width Low

1.3

1.3

1.3

µs

Input Transition to Clock

Transition

100

100

100

ns

600

600

600

ns

Input High to Input Low (Bus

Free)

1.3

1.3

1.3

µs

Clock Low to Data Out Valid

200

900

200

900

200

900

ns

Data Out Hold Time After Clock

Low

200

200

200

ns

Clock Frequency

400

400

400

kHz

Write Time

10

10

10

ms

Table 10. AC Measurement Conditions

Input Rise and Fall Times

≤ 50 ns

Input Pulse Voltages

Input and Output Timing

Reference Voltages

Figure 9. AC Testing Input Output Waveforms

AI00825

0.8VCC

0.2VCC

0.7VCC

0.3VCC