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ST24LW21 Folha de dados(PDF) 3 Page - STMicroelectronics

Nome de Peças ST24LW21
Descrição Electrónicos  1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST24LW21 Folha de dados(HTML) 3 Page - STMicroelectronics

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Symbol
Parameter
Value
Unit
TA
Ambient Operating Temperature
–40 to 85
°C
TSTG
Storage Temperature
–65 to 150
°C
TLEAD
Lead Temperature, Soldering
(SO8 package)
(PSDIP8 package)
40 sec
10 sec
215
260
°C
VIO
Input or Output Voltages
–0.3 to 6.5
V
VCC
Supply Voltage
–0.3 to 6.5
V
VESD
Electrostatic Discharge Voltage (Human Body model)
(2)
4000
V
Electrostatic Discharge Voltage (Machine model)
(3)
500
V
Notes: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings"
may cause permanent damage to the device. These are stress ratings only and operation of thedevice at these or any other
conditions above those indicated in the Operating sections of this specification is not implied. 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.
2. MIL-STD-883C, 3015.7 (100pF, 1500
Ω).
3. EIAJ IC-121 (Condition C) (200pF, 0
Ω).
Table 2. Absolute Maximum Ratings (1)
Device Code
Chip Enable
RW
Bit
b7
b6
b5
b4
b3
b2
b1
b0
Device Select
1
0
1
0
X
X
X
RW
Note: The MSB b7 is sent first.
X = 0 or 1.
Table 3A. Device Select Code (ST24LC21B, ST24LW21, ST24FC21 and ST24FW21)
The ST24xy21 can operate in two modes: Trans-
mit-Only mode and I2C bidirectional mode. When
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 I2C bidirectional mode
upon the falling edge of the signal applied on SCL
pin. When in I2C mode, the ST24LC21B (or the
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
switch back to the Transmit-Only mode if no valid
I2C activity is observed. Both Plastic Dual-in-Line
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).
DESCRIPTION (cont’d)
Device Code
Chip Enable
RW
Bit
b7
b6
b5
b4
b3
b2
b1
b0
Device Select
1
010000
RW
Note: The MSB b7 is sent first.
X = 0 or 1.
Table 3B. Device Select Code (ST24FC21B)
3/22
ST24LC21B, ST24LW21, ST24FC21, ST24FC21B, ST24FW21


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