24AA256/24LC256/24FC256
AC CHARACTERISTICS (Continued)
Param.
No.
13
Electrical Characteristics:
Industrial (I):
V
CC
= +1.8V to 5.5V
Automotive (E): V
CC
= +2.5V to 5.5V
Min.
—
—
—
—
4700
1300
1300
500
10 + 0.1CB
Max.
3500
900
900
400
—
—
—
—
250
250
50
5
—
Units
ns
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
Conditions
1.8 V
≤
V
CC
<
2.5V
2.5 V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V 24FC256
2.5 V
≤
V
CC
≤
5.5V 24FC256
1.8V
≤
V
CC
<
2.5V
2.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
<
2.5V 24FC256
2.5V
≤
V
CC
≤
5.5V 24FC256
All except, 24FC256
Sym.
T
AA
Characteristic
Output valid from clock
14
T
BUF
Bus free time: Time the bus
must be free before a new
transmission can start
Output fall time from V
IH
minimum to V
IL
maximum
C
B
≤
100 pF
Input filter spike suppression
(SDA and SCL pins)
Write cycle time (byte or
page)
Endurance
ns
15
T
OF
ns
16
17
18
Note 1:
2:
3:
4:
T
SP
T
WC
—
—
—
1,000,000
ns
ms
All except, 24FC256
and 3)
—
cycles 25°C
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 new Schmitt Trigger inputs, which provide improved
noise 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.
FIGURE 1-1:
BUS TIMING DATA
5
D4
4
2
SCL
SDA
IN
7
6
16
3
8
9
10
13
SDA
OUT
(protected)
(unprotected)
14
WP
11
12
DS21203N-page 4
©
2005 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
