FM24C256
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
tLOW
tHIGH
tAA
SCL Clock Frequency
Clock Low Period
Clock High Period
SCL Low to SDA Data Out Valid
0
4.7
4.0
100
0
1.3
0.6
400
0
0.6
0.4
1000
kHz
µs
µs
3
0.9
0.55
µs
tBUF
Bus Free Before New
Transmission
4.7
1.3
0.5
µs
tHD:STA
tSU:STA
Start Condition Hold Time
Start Condition Setup for Repeated
Start
4.0
4.7
0.6
0.6
0.25
0.25
µs
µs
tHD:DAT
tSU:DAT
tR
tF
tSU:STO
tDH
Data In Hold
Data In Setup
Input Rise Time
Input Fall Time
Stop Condition Setup
0
250
0
100
0
100
ns
ns
ns
ns
µs
ns
1000
300
300
300
300
100
1
1
4.0
0
0.6
0
0.25
0
Data Output Hold
(from SCL @ VIL)
Noise Suppression Time Constant
on SCL, SDA
tSP
50
50
50
ns
Notes : All SCL specifications as well as start and stop conditions apply to both read and write operations.
This parameter is periodically sampled and not 100% tested.
1
Capacitance (TA = 25° C, f=1.0 MHz, VDD = 5V)
Symbol
CI/O
CIN
Parameter
Input/Output Capacitance (SDA)
Input Capacitance
Max
8
6
Units
pF
pF
Notes
1
1
Notes
This parameter is periodically sampled and not 100% tested.
1
AC Test Conditions
Equivalent AC Load Circuit
Input Pulse Levels
Input rise and fall times
Input and output timing levels
0.1 VDD to 0.9 VDD
10 ns
0.5 VDD
5.5V
1700
Ω
Output
100 pF
Rev 3.1
May 2005
Page 9 of 12
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
