AC Characteristics
Applicable over recommended operating range from TA = -40°C to +85°C, VCC = +2.5V to +5.5V CL = 1 TTL Gate and
100 pF (unless otherwise noted).
2.5-volt
Symbol
fSCL
Parameter
Min
0
Max
Units
KHz
µs
Clock Frequency, SCL
Clock Pulse Width Low
Clock Pulse Width High
100
tLOW
tHIGH
tI
4.7
4.0
µs
Noise Suppression Time(1)
(SDA and SCL pins)
NA
3.5
ns
tAA
Clock Low to Data Out Valid
0.1
4.7
µs
µs
tBUF
Time the bus must be free before a new
transmission can start
tHD.STA
tSU.STA
tHD.DAT
tSU.DAT
tR
Start Hold Time
4.0
4.7
0
µs
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
5.0V, 25°C, Page Mode
µs
µs
250
ns
1.0
µs
tF
300
ns
tSU.STO
tDH
4.0
µs
ns
100
tWR
10
ms
Endurance(1)
1M
Write Cycles
Note:
1. This parameter is characterized and is not 100% tested.
AT24C21
4
ATMEL [ ATMEL ]
