5
AT24C01A/02/04/08A/16A
5092B–SEEPR–9/05
Note: 1. This parameter is characterized and is not 100% tested (T
A
= 25°C).
2. This parameter is characterized.
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 to
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 to 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 “0” to acknowledge that it has received
each word. This happens during the ninth clock cycle.
STANDBY MODE: The AT24C01A/02/04/08A/16A 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.
Table 5. AC Characteristics
Applicable over recommended operating range from T
A
= −40°C to +125°C, V
CC
= +2.7V to +5.5V, CL = 1 TTL Gate and
100 pF (unless otherwise noted)
Symbol Parameter
AT24C01A/02/04/08A/16A
UnitsMin Max
f
SCL
Clock Frequency, SCL 400 kHz
t
LOW
Clock Pulse Width Low 1.2 µs
t
HIGH
Clock Pulse Width High 0.6 µs
t
I
Noise Suppression Time
(1)
50 ns
t
AA
Clock Low to Data Out Valid 0.1 0.9 µs
t
BUF
Time the bus must be free before
a new transmission can start
(2)
1.2 µs
t
HD.STA
Start Hold Time 0.6 µs
t
SU.STA
Start Set-up Time 0.6 µs
t
HD.DAT
Data In Hold Time 0 µs
t
SU.DAT
Data In Set-up Time 100 ns
t
R
Inputs Rise Time
(2)
300 ns
t
F
Inputs Fall Time
(2)
300 ns
t
SU.STO
Stop Set-up Time 0.6 µs
t
DH
Data Out Hold Time 50 ns
t
WR
Write Cycle Time 5 ms
Endurance
(2)
5.0V, 25°C, Page Mode 1M Write Cycles
DVD47 harman/kardon
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