ST24FC21 STMICROELECTRONICS [STMicroelectronics], ST24FC21 Datasheet - Page 3

• Manufacturer Part Number: ST24FC21
• Description: 1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Table 2. Absolute Maximum Ratings
Notes: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings"
Table 3A. Device Select Code (ST24LC21B, ST24LW21, ST24FC21 and ST24FW21)
Note: The MSB b7 is sent first.
Table 3B. Device Select Code (ST24FC21B)
Note: The MSB b7 is sent first.
DESCRIPTION (cont’d)
The ST24xy21 can operate in two modes: Trans-
mit-Only mode and I
powered, the device is in Transmit-Only mode with
EEPROM data clocked out from the rising edge of
the signal applied on VCLK.
The device will switch to the I
upon the falling edge of the signal applied on SCL
pin. When in I
ST24LW21) cannot switch back to the Transmit
Only mode (except when the power supply is re-
moved). For the ST24FC21, ST24FC21B (or the
ST24FW21), after the falling edge of SCL, the
memory enter in a transition state which allowed to
Bit
Device Select
Bit
Device Select
Symbol
T
T
V
V
V
LEAD
T
STG
ESD
CC
IO
A
2. MIL-STD-883C, 3015.7 (100pF, 1500
3. EIAJ IC-121 (Condition C) (200pF, 0 ).
X = 0 or 1.
X = 0 or 1.
may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other
conditions above those indicated in the Operating sections of this specification is not i m plied. Exposure to Absolute Maximum
Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other
relevant quality documents.
Ambient Operating Temperature
Storage Temperature
Lead Temperature, Soldering
Input or Output Voltages
Supply Voltage
Electrostatic Discharge Voltage (Human Body model)
Electrostatic Discharge Voltage (Machine model)
2
C mode, the ST24LC21B (or the
2
C bidirectional mode. When
b7
b7
1
1
2
C bidirectional mode
ST24LC21B, ST24LW21, ST24FC21, ST24FC21B, ST24FW21
b6
b6
Device Code
0
Device Code
0
).
Parameter
(1)
(SO8 package)
(PSDIP8 package)
b5
b5
1
1
(3)
switch back to the Transmit-Only mode if no valid
I
and Plastic Small Outline packages are available.
Transmit Only Mode
After a Power-up, the ST24xy21 is in the Transmit
Only mode. A proper initialization sequence (see
Figure 3) must supply nine clock pulses on the
VCLK pin (in order to internally synchronize the
device). During this initialization sequence, the
SDA pin is in high impedance. On the rising edge
of the tenth pulse applied on VCLK pin, the device
will output the first bit of byte located at address 00h
(most significant bit first).
b4
b4
2
0
0
C activity is observed. Both Plastic Dual-in-Line
(2)
40 sec
10 sec
b3
b3
X
0
Chip Enable
Chip Enable
b2
b2
X
0
–0.3 to 6.5
–0.3 to 6.5
–40 to 85
–65 to 150
Value
4000
215
260
500
b1
b1
X
0
RW
RW
RW
RW
b0
b0
Unit
V
V
V
V
C
C
C
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