ACE24C02A

Two-wire Serial EEPROM

VER 1.2

5

Data In Hold Time

0

0

0

µs

Data In Setup Time

100

100

100

ns

Inputs Rise Time

0.3

0.3

0.3

µs

Inputs Fall Time

300

100

100

ns

Stop Setup Time

0.6

0.25

0.25

µs

Data Out Hold Time

50

50

50

ns

Write Cycle Time

5

5

5

ms

Endurance

(1)

5.0V, 25℃, Page Mode

1,000,000

Write

Cycles

Notes:1. This parameter is characterized and not 100% tested.

2.AC measurement conditions:

RL (connects to Vcc): 1.3kΩ (2.5V, 5.5V), 10kΩ (1.7V)

Input pulse voltages: 0.3 Vcc to 0.7 Vcc

Input rise and fall times: ≦50 ns

Input and output timing reference voltages: 0.5Vcc

Device Operation

Clock and Data Transitions:

The SDA pin is normally pulled high with an external device. Data on the SDA pin may change only

during SCL low time periods (refer to Figure 4). 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 (refer to Figure 5).

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 (refer to Figure 5).

Acknowledge:

All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The

EEPROM sends a zero during the ninth clock cycle to acknowledge that it has received each word. The

happens during the ninth clock cycle. Following receipt each word from the EEPROM, the

microcontroller should send a zero to EEPROM and continue to output the next data word or send a

stop condition to finish the read cycle.

Standby Mode :

The ACE24C02A features a low-power standby mode which is enabled: (a) upon power-up and (b) after

the receipt of the stop bit and the completion of any internal operations.