5

AT24C01A/02/04/08/16

3256F–SEEPR–10/04

Notes:

1. The AT24C01A/02/04/08 bearing the process letter “D” on the package (the mark is located in the lower right corner on the

topside of the package), guarantees 400 kHz (2.5V, 2.7V).

3. This parameter is characterized and is not 100% tested.

Device Operation

CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an exter-

nal device. Data on the SDA pin may change only during SCL low time periods (see

Figure 4 on page 7). Data changes during SCL high periods will indicate a start or stop

condition as defined below.

START CONDITION: A high-to-low transition of SDA with SCL high is a start condition

which must precede any other command (see Figure 5 on page 7).

STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition.

After a read sequence, the stop command will place the EEPROM in a standby power

mode (see Figure 5 on page 7).

ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the

EEPROM in 8-bit words. The EEPROM sends a zero to acknowledge that it has

received each word. This happens during the ninth clock cycle.

Table 5. AC Characteristics

Applicable over recommended operating range from T

100 pF (unless otherwise noted).

Symbol

Parameter

AT24C01A/02/04/08,

2.7V

AT24C16, 2.7V

AT24C01A/02/04/08/16,

5.0V

Units

Min

Max

Min

Max

Min

Max

f

SCL

Clock Frequency, SCL

400

(1)

400

400

kHz

t

LOW

Clock Pulse Width Low

1.2

1.2

1.2

µs

t

HIGH

Clock Pulse Width High

0.6

0.6

0.6

µs

t

I

Noise Suppression Time

(2)

50

50

50

ns

t

AA

Clock Low to Data Out Valid

0.1

0.9

0.1

0.9

0.1

0.9

µs

t

BUF

Time the bus must be free before

a new transmission can start

(3)

1.2

1.2

1.2

µs

t

HD.STA

Start Hold Time

0.6

0.6

0.6

µs

t

SU.STA

Start Set-up Time

0.6

0.6

0.6

µs

t

HD.DAT

Data In Hold Time

0

0

0

µs

t

SU.DAT

Data In Set-up Time

100

100

100

ns

t

R

Inputs Rise Time

(3)

300

300

300

ns

t

F

Inputs Fall Time

(3)

300

300

300

ns

t

SU.STO

Stop Set-up Time

0.6

0.6

0.6

µs

t

DH

Data Out Hold Time

50

50

50

ns

t

WR

Write Cycle Time

5

5

5

ms

Endurance

5.0V, 25

°C1M

1M

1M

Write

Cycles