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PDF AT24C128C Datasheet ( Hoja de datos )

Número de pieza AT24C128C
Descripción I2C Automotive Temperature Serial EEPROM
Fabricantes ATMEL 
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AT24C128C datasheet

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AT24C128C pdf
5.3 AC Characteristics
Table 5-3. AC Characteristics (Industrial Temperature)
Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = 1.7V to 5.5V, CL = 100pF (unless
otherwise noted). Test conditions are listed in Note 2.
1.7V
2.5V, 5.0V
Symbol
Parameter
Min Max Min Max
Units
fSCL
tLOW
tHIGH
tI
tAA
tBUF
Clock Frequency, SCL
Clock Pulse Width Low
Clock Pulse Width High
Noise Suppression Time(1)
Clock Low to Data Out Valid
Time the bus must be free before a new transmission
can start(1)
1300
600
50
1300
400
100
900
1000
400
400
50
50 550
500
kHz
ns
ns
ns
ns
ns
tHD.STA
tSU.STA
tHD.DAT
tSU.DAT
tR
tF
tSU.STO
tDH
tWR
Endurance(1)
Start Hold Time
Start Set-up Time
Data In Hold Time
Data In Set-up Time
Inputs Rise Time(1)
Inputs Fall Time(1)
Stop Set-up Time
Data Out Hold Time
Write Cycle Time
25°C, Page Mode, 3.3V
600 250
ns
600 250
ns
00
ns
100 100
ns
300 300 ns
300 100 ns
600 250
ns
50 50
ns
5 5 ms
1,000,000
Write Cycles
Notes: 1. This parameter is ensured by characterization and is not 100% tested.
2. AC measurement conditions:
RL (connects to VCC): 1.3kΩ (2.5V, 5.5V), 10kΩ (1.7V)
Input pulse voltages: 0.3VCC to 0.7VCC
Input rise and fall times: 50ns
Input and output timing reference voltages: 0.5 x VCC
AT24C128C [DATASHEET]
Atmel-8734D-SEEPROM-AT24C128C-Datasheet_082015
5

5 Page

AT24C128C arduino
9. Read Operations
Read operations are initiated the same way as write operations with the exception that the read/write select bit
in the device address word is set to one. There are three read operations:
Current Address Read
Random Address Read
Sequential Read
Current Address Read: The internal data word address counter maintains the last address accessed during
the last read or write operation, incremented by one. This address stays valid between operations as long as the
chip power is maintained. The address roll-over during read is from the last byte of the last memory page, to the
first byte of the first page.
Once the device address with the read/write select bit set to one is clocked in and acknowledged by the
EEPROM, the current address data word is serially clocked out. The microcontroller does not respond with an
input zero but does generate a following stop condition.
Figure 9-1. Current Address Read
S
T
A
R Device
T Address
SDA Line
M
S
B
R
E
A
D
RA
/C
WK
Data
S
T
O
P
N
O
A
C
K
Random Read: A Random Read requires a dummy byte write sequence to load in the data word address. Once
the device address word and data word address are clocked in and acknowledged by the EEPROM, the
microcontroller must generate another start condition. The microcontroller now initiates a Current Address Read
by sending a device address with the read/write select bit high. The EEPROM acknowledges the device
address and serially clocks out the data word. The microcontroller does not respond with a zero but does
generate a following stop condition.
Figure 9-2. Random Read
SDA LINE
S
T
A
R Device
T Address
M
S
B
W
R
I
T First Word
E Address
Second Word
Address
S
T
A
R Device
T Address
RA
/C
WK
A
C
K
LA
SC
BK
R
E
A
D
RA
/C
WK
Note: * = Don’t care bit
Dummy Write
Data (n)
S
T
O
P
N
O
A
C
K
AT24C128C [DATASHEET]
Atmel-8734D-SEEPROM-AT24C128C-Datasheet_082015
11

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