Table 5.
AC Characteristics
– Extended Temperatures
Applicable over recommended operating range from T
AE
=
–
40°C to +125°C, V
CC
= +2.7V to +5.5V, CL = 100 pF (unless
otherwise noted). Test conditions are listed in Note 2.
2.7-volt
Symbol
f
SCL
t
LOW
t
HIGH
t
AA
t
BUF
t
HD.STA
t
SU.STA
t
HD.DAT
t
SU.DAT
t
R
t
F
t
SU.STO
t
DH
t
WR
Endurance
Notes:
Parameter
Clock Frequency, SCL
Clock Pulse Width Low
Clock Pulse Width High
Clock Low to Data Out Valid
Time the bus must be free before a new
transmission can start
Start Hold Time
Start Set-up Time
Data In Hold Time
Data In Set-up Time
Inputs Rise Time
Inputs Fall Time
Stop Set-up Time
Data Out Hold Time
Write Cycle Time
25°C, Page Mode
0.6
50
10
or
5
100k or 1,000,000
1.3
0.6
0.05
1.3
0.6
0.6
0
100
0.3
300
0.25
50
10
or
5
0.9
Min
Max
400
0.4
0.4
0.05
0.5
0.25
0.25
0
100
0.3
100
0.55
Min
5.0-volt
Max
1000
Units
kHz
µs
µs
µs
µs
µs
µs
µs
ns
µs
ns
µs
ns
ms
Write
Cycles
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).
5. The AT24C128/256 bearing the process letter “B” on the package (the mark is located in the lower right corner on the top-
side of the package) are approved for operation in the extended temperature range.
6
AT24C128/256
0670S–SEEPR–5/06
ATMEL [ ATMEL CORPORATION ]
