CAT24C321/322/641/642

3

Advanced

Doc. No. 25083-00 12/98

A.C. CHARACTERISTICS

Output Load is 1 TTL Gate and 100pF

Read & Write Cycle Limits

Symbol

Parameter

Min.

Max.

Min.

Max.

Units

Clock Frequency

100

400

kHz

Noise Suppression Time

200

200

ns

Constant at SCL, SDA Inputs

SCL Low to SDA Data Out

3.5

1

µs

and ACK Out

Time the Bus Must be Free Before

4.7

1.2

µs

a New Transmission Can Start

Start Condition Hold Time

4

0.6

µs

Clock Low Period

4.7

1.2

µs

Clock High Period

4

0.6

µs

Start Condition Setup Time

4.7

0.6

µs

(for a Repeated Start Condition)

Data In Hold Time

0

0

ns

Data In Setup Time

50

50

ns

SDA and SCL Rise Time

1

0.3

µs

SDA and SCL Fall Time

300

300

ns

Stop Condition Setup Time

4

0.6

µs

Data Out Hold Time

100

100

ns

Symbol

Parameter

Max.

Units

Power-up to Read Operation

1

ms

Power-up to Write Operation

1

ms

Note:

(1) This parameter is tested initially and after a design or process change that affects the parameter.

Write Cycle Limits

Symbol

Parameter

Min.

Typ.

Max

Units

Write Cycle Time

10

ms

The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal program/erase

cycle. During the write cycle, the bus interface circuits are disabled, SDA is allowed to remain high, and the device

does not respond to its slave address.