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24LC21A
TABLE 1-2:
AC CHARACTERISTICS
Vcc = 2.5-5.5V
Vcc = 4.5 - 5.5V
Parameter
Symbol
Standard Mode
Min.
Max.
Fast Mode
Min.
Max.
Units
Remarks
Clock frequency
Clock high time
Clock low time
F CLK
T HIGH
T LOW
—
4000
4700
100
—
—
—
600
1300
400
—
—
kHz
ns
ns
SDA and SCL rise time
SDA and SCL fall time
Start condition hold time
T R
T F
T HD : STA
—
—
4000
1000
300
—
—
—
600
300
300
—
ns
ns
ns
(Note 1)
(Note 1)
After this period the first clock
pulse is generated
Start condition setup time
T SU : STA
4700
—
600
—
ns
Only relevant for repeated
Start condition
Data input hold time
Data input setup time
Stop condition setup time
Output valid from clock
Bus free time
T HD : DAT
T SU : DAT
T SU : STO
T AA
T BUF
0
250
4000
—
4700
—
—
—
3500
—
0
100
600
—
1300
—
—
—
900
—
ns
ns
ns
ns
ns
(Note 2)
(Note 2)
Time the bus must be free
before a new transmission
can start
Output fall time from V IH
T OF
—
250
20 + 0.1
250
ns
(Note 1) , C B ≤ 100 pF
minimum to V IL maximum
C B
Input filter spike suppres-
T SP
—
50
—
50
ns
(Note 3)
sion (SDA and SCL pins)
Write cycle time T WR
—
10
—
10
ms
Byte or Page mode
Transmit-Only Mode Parameters
Output valid from VCLK T VAA
VCLK high time T VHIGH
VCLK low time T VLOW
VCLK setup time T VHST
VCLK hold time T SPVL
Mode transition time T VHZ
—
4000
4700
0
4000
—
2000
—
—
—
—
1000
—
600
1300
0
600
—
1000
—
—
—
—
500
ns
ns
ns
ns
ns
ns
Transmit-only power-up
T VPU
0
—
0
—
ns
time
Input filter spike suppres-
T SPV
—
100
—
100
ns
sion (VCLK pin)
Endurance —
1M
—
1M
—
cycles
25°C, Vcc = 5.0V, Block
mode (Note 4)
Note 1:
2:
3:
4:
Not 100% tested. C B = Total capacitance of one bus line in pF.
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.
The combined T SP and V HYS specifications are due to Schmitt Trigger inputs which provide noise and
spike suppression. This eliminates the need for a T I specification for standard operation.
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 Microchip’s web site
at www.microchip.com.
? 2008 Microchip Technology Inc.
DS21160G-page 3
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