24C256 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
24C256 Datasheet PDF : 12 Pages
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AC Conditions of Test
Input Pulse Levels
Input Rise and Fall Times
VCC x 0.1 to VCC x 0.9
10 ns
Input & Output Timing Levels VCC x 0.5
Output Load
1 TTL Gate and CL = 100 pF
Read and Write Cycle Limits (Standard and Low VCC Range - 2.7V-5.5V)
Symbol
Parameter
100 kHz
Min
Max
400 kHz
Min
Max
fSCL
SCL Clock Frequency
100
400
TI
Noise Suppression Time Constant at
SCL, SDA Inputs (Minimum VIN
100
50
Pulse width)
tAA
SCL Low to SDA Data Out Valid
0.3
3.5
0.3
1.2
tBUF
Time the Bus Must Be Free before
4.7
1.3
a New Transmission Can Start
tHD:STA
Start Condition Hold Time
4.0
0.6
tLOW
Clock Low Period
4.7
1.5
tHIGH
Clock High Period
4.0
0.6
tSU:STA
Start Condition Setup Time
4.7
0.6
(for a Repeated Start Condition)
tHD:DAT
tSU:DAT
tR
tF
tSU:STO
tDH
tWR
(Note 2)
Data in Hold Time
Data in Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Condition Setup Time
Data Out Hold Time
Write Cycle Time
0
0
250
100
1
0.3
300
300
4.7
0.6
100
100
6
6
Units
kHz
ns
µs
µs
µs
µs
µs
µs
µs
ns
µs
ns
µs
ns
ms
Note 2: The write cycle time (tWR) is the time from a valid stop condition of a write sequence to the end of the internal erase/program cycle. During the write cycle, the
FM24C256 bus interface circuits are disabled, SDA is allowed to remain high per the bus-level pull-up resistor, and the device does not respond to its slave address
FM24C256 rev. B.3
5
www.fairchildsemi.com
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