24LC21A_03 Datasheet, PDF (3/18 Pages) Microchip Technology – 1K 2.5V Dual Mode I 2 C Serial EEPROM

24LC21A
TABLE 1-2: AC CHARACTERISTICS
Parameter
Vcc= 2.5-5.5V Vcc= 4.5 - 5.5V
Symbol ^{Standard Mode Fast Mode}
Units
Remarks
Min Max Min Max
Clock frequency
FCLK
—
100
—
400 kHz
Clock high time
THIGH
4000
—
600
—
ns
Clock low time
TLOW
4700
—
1300
—
ns
SDA and SCL rise time TR
—
1000
—
300
ns (Note 1)
SDA and SCL fall time
TF
—
300
—
300
ns (Note 1)
Start condition hold time THD:STA 4000
—
600
—
ns After this period the first clock
pulse is generated
Start condition setup time TSU:STA 4700
—
600
—
ns Only relevant for repeated
Start condition
Data input hold time
THD:DAT
0
—
0
—
ns (Note 2)
Data input setup time
TSU:DAT 250
—
100
—
ns
Stop condition setup time TSU:STO 4000
—
600
—
ns
Output valid from clock TAA
—
3500
—
900
ns (Note 2)
Bus free time
TBUF
4700
—
1300
—
ns Time the bus must be free
before a new transmission
can start
Output fall time from VIH TOF
minimum to VIL maximum
—
250 20 + 0.1 250
ns (Note 1), CB ≤ 100 pF
CB
Input filter spike suppres- TSP
sion (SDA and SCL pins)
—
50
—
50
ns (Note 3)
Write cycle time
TWR
—
10
—
10
ms Byte or Page mode
Transmit-Only Mode Parameters
Output valid from VCLK TVAA
—
2000
—
1000
ns
VCLK high time
TVHIGH 4000
—
600
—
ns
VCLK low time
TVLOW
4700
—
1300
—
ns
VCLK setup time
TVHST
0
—
0
—
ns
VCLK hold time
TSPVL
4000
—
600
—
ns
Mode transition time
TVHZ
—
1000
—
500
ns
Transmit-only power-up
time
TVPU
0
—
0
—
ns
Input filter spike suppres- TSPV
sion (VCLK pin)
—
100
—
100
ns
Endurance
—
1M
—
1M
— cycles 25°C, Vcc = 5.0V, Block
mode (Note 4)
Note 1: Not 100% tested. CB = Total capacitance of one bus line in pF.
2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
3: The combined TSP and VHYS specifications are due to Schmitt Trigger inputs which provide noise and
spike suppression. This eliminates the need for a TI specification for standard operation.
4: This parameter is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model which can be obtained from our web site.
 2003 Microchip Technology Inc.
DS21160F-page 3