10 / 13 page
FM24C256
Rev 1.3
Feb. 2004
Page 10 of 13
AC Parameters (TA = -40° C to + 85° C, VDD = 4.5V to 5.5V, CL = 100 pF unless otherwise specified)
Symbol
Parameter
Min
Max
Min
Max
Min
Max
Units
Notes
fSCL
SCL Clock Frequency
0
100
0
400
0
1000
kHz
tLOW
Clock Low Period
4.7
1.3
0.6
µs
tHIGH
Clock High Period
4.0
0.6
0.4
µs
tAA
SCL Low to SDA Data Out Valid
3
0.9
0.55
µs
tBUF
Bus Free Before New
Transmission
4.7
1.3
0.5
µs
tHD:STA
Start Condition Hold Time
4.0
0.6
0.25
µs
tSU:STA
Start Condition Setup for Repeated
Start
4.7
0.6
0.25
µs
tHD:DAT
Data In Hold
0
0
0
ns
tSU:DAT
Data In Setup
250
100
100
ns
tR
Input Rise Time
1000
300
300
ns
1
tF
Input Fall Time
300
300
100
ns
1
tSU:STO
Stop Condition Setup
4.0
0.6
0.25
µs
tDH
Data Output Hold
(from SCL @ VIL)
0
0
0
ns
tSP
Noise Suppression Time Constant
on SCL, SDA
50
50
50
ns
Notes : All SCL specifications as well as start and stop conditions apply to both read and write operations.
1
This parameter is periodically sampled and not 100% tested.
Data Retention (VDD = 4.5V to 5.5V unless otherwise specified)
Parameter
Min
Units
Notes
Data Retention
10
Years
1
Notes
1.
The relationship between retention, temperature, and the associated reliability level is
characterized separately.
Capacitance (TA = 25° C, f=1.0 MHz, VDD = 5V)
Symbol
Parameter
Max
Units
Notes
CI/O
Input/output capacitance (SDA)
8
pF
1
CIN
Input capacitance
6
pF
1
Notes
1
This parameter is periodically sampled and not 100% tested.
AC Test Conditions
Equivalent AC Load Circuit
Input Pulse Levels
0.1 VDD to 0.9 VDD
Input rise and fall times
10 ns
Input and output timing levels
0.5 VDD
5.5V
Output
1700
Ω
100 pF