5
AT24C128/256
0670T–SEEPR–3/07
Table 4. AC Characteristics – Industrial Temperatures
Notes: 1. This parameter is characterized and is not 100% tested.
2. AC measurement conditions:
R
L
(connects to V
CC
): 1.3 kΩ (2.5V, 5V), 10 kΩ (1.8V)
Input pulse voltages: 0.3 V
CC
to 0.7 V
CC
Input rise and fall times: ≤ 50 ns
Input and output timing reference voltages: 0.5 V
CC
3. The Write Cycle Time of 5 ms only applies to the AT24C128/256 devices bearing the process letter “B” on the package (the
mark is located in the lower right corner on the top side of the package).
4. The AT24C128/256 bearing the process letter “B” in the package (the mark is located in the lower right corner on the top
side of the package), guarantees 1 million write cycle endurance (1.8 – 3.6V).
Applicable over recommended operating range from T
AI
= –40° C to +85° C, V
CC
= +1.8V to +5.5V, CL = 100 pF (unless oth-
erwise noted). Test conditions are listed in Note 2.
Symbol Parameter
1.8-volt 2.5-volt 5.0-volt
UnitsMin Max Min Max Min Max
f
SCL
Clock Frequency, SCL 100 400 1000 kHz
t
LOW
Clock Pulse Width Low 4.7 1.3 0.4 µs
t
HIGH
Clock Pulse Width High 4.0 0.6 0.4 µs
t
AA
Clock Low to Data Out Valid 0.1 4.5 0.05 0.9 0.05 0.55 µs
t
BUF
Time the bus must be free before a
new transmission can start
(1)
4.7 1.3 0.5 µs
t
HD.STA
Start Hold Time 4.0 0.6 0.25 µs
t
SU.STA
Start Set-up Time 4.7 0.6 0.25 µs
t
HD.DAT
Data In Hold Time 0 0 0 µs
t
SU.DAT
Data In Set-up Time 200 100 100 ns
t
R
Inputs Rise Time
(1)
1.0 0.3 0.3 µs
t
F
Inputs Fall Time
(1)
300 300 100 ns
t
SU.STO
Stop Set-up Time 4.7 0.6 0.25 µs
t
DH
Data Out Hold Time 100 50 50 ns
t
WR
Write Cycle Time 20 or 5
(3)
10 or 5
(3)
10 or 5
(3)
ms
Endurance
(1)
25°C, Page Mode 100k or 1,000,000
(4)
Write
Cycles
