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  Microchip Technology Semiconductor Electronic Components Datasheet  

24LC41A Datasheet

1K/4K 2.5V Dual Mode

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24LC41A
1K/4K 2.5V Dual Mode, Dual Port I2C™ Serial EEPROM
Features
• Single supply with operation down to 2.5V
• Completely implements DDC1/DDC2interface
for monitor identification, including recovery to
DDC1
• Improved noise immunity
• Separate high speed 2-wire bus for
microcontroller access to 4K-bit Serial EEPROM
• Low-power CMOS technology
• 2 mA active current typical
• 20 µA standby current typical at 5.5V
• Dual 2-wire serial interface bus, I2Ccompatible
• Hardware write-protect for Microcontroller Access
Port
• Self-timed write cycle (including auto-erase)
• Page write buffer for up to 8 bytes (DDC port) or
16 bytes (4K Port)
• 100 kHz (2.5V) and 400 kHz (5V) compatibility
• 1,000,000 erase/write cycles
• Data retention > 40 years
• 8-pin PDIP package
• Available for extended temperature ranges
- Commercial (C):
- Industrial (I):
0°C to +70°C
-40°C to +85°C
Description
The Microchip Technology Inc. 24LC41A is a dual port
www.DataShee1t24U8.cxom8 and 512 x 8-bit Electrically Erasable PROM
(EEPROM). This device is designed for use in applica-
tions requiring storage and serial transmission of
configuration and control information. Three modes of
operation have been implemented:
• Transmit-only mode for the DDC Monitor Port
• Bidirectional mode for the DDC Monitor Port
• Bidirectional, industry-standard 2-wire bus for the
4K Microcontroller Access Port
Upon power-up, the DDC Monitor Port will be in the
Transmit-only mode, repeatedly sending a serial bit
stream of the entire memory array contents, clocked by
the VCLK pin. A valid high-to-low transition on the
DSCL pin will cause the device to enter the transition
mode, an look for a valid control byte on the I2C bus. If
it detects a valid control byte from the master, it will
switch to Bidirectional mode, with byte selectable read/
write capability of the memory array using DSCL. If no
control byte is received, the device will revert to the
Transmit-only mode after it received 128 consecutive
VCLK Package Type pulses while the DSCL pin is idle.
The 4K-bit microcontroller port is completely indepen-
dent of the DDC port, therefore, it can be accessed
continuously by a microcontroller without interrupting
DDC transmission activity. The 24LC41A is available in
a standard 8-pin PDIP package in both commercial and
industrial temperature ranges.
Package Type
PDIP
DSCL
1
8 DSDA
VCLK 2
7 Vcc
VSS 3
6 MWP
MSDA 4
5 MSCL
Block Diagram
EDID Table
1K-Bit
MSDA
4K-Bit
Serial
EEPROM
DSDA
VCLK
DSCL
MSCL
Pin Function Table
Name
Function
DSCL
DSDA
VCLK
MSCL
MSDA
MWP
VSS
VCC
Serial Clock for DDC Bidirectional mode
(DDC2)
Serial Address and Data I/O(DDC Bus)
Serial Clock for DDC Transmit-only mode
(DDC1)
Serial clock for 4K-bit MCU port
Serial Address and Data I/O for 4K-bit MCU port
Hardware write-protect for Microcontroller
Access Port
Ground
+2.5V to +5.5V power supply
I2C is a trademark of Philips Corporation.
DDC is a trademark of Video Electronics Standards Association.
2003 Microchip Technology Inc.
DS21176D-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

24LC41A Datasheet

1K/4K 2.5V Dual Mode

No Preview Available !

24LC41A
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings(†)
VCC.............................................................................................................................................................................6.5V
All inputs and outputs w.r.t. VSS ......................................................................................................... -0.6V to VCC +1.0V
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature with power applied ................................................................................................-65°C to +125°C
ESD protection on all pins ......................................................................................................................................................≥ 4 kV
† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. This is a stress rating only and functional operation of the device at those or any other conditions
above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating
conditions for extended periods may affect device reliability.
TABLE 1-1: DC CHARACTERISTICS
DC CHARACTERISTICS
VCC = +2.5V to 5.5V
Commercial (C): TA = 0°C to +70°C
Industrial (I): TA =-40°C to +85°C
Parameter
Symbol Min Max Units
Conditions
DSCL, DSDA, MSCL & MSDA pins:
High-level input voltage
VIH .7 VCC
Low-level input voltage
VIL — .3 VCC
Input levels on VCLK pin:
High-level input voltage
Low-level input voltage
VIH 2.0 .8
VIL — .2 VCC
Hysteresis of Schmitt Trigger inputs VHYS .05 VCC
Low-level output voltage
VOL1
— .4
Low-level output voltage
VOL2
— .6
Input leakage current
ILI — ±1
www.DataSOhueteptu4tUl.ecaokmage current
ILO — ±1
Pin capacitance (all inputs/outputs) CIN, COUT
10
V
V
V
V
V
V
V
µA
µA
pF
Operating current
Standby current
ICC Write
ICC Read
ICCS
3 mA
1 mA
60 µA
200 µA
Note: This parameter is periodically sampled and not 100% tested.
VCC 2.7V (Note)
VCC < 2.7V (Note)
(Note)
IOL = 3 mA, VCC = 2.5V (Note)
IOL = 6 mA, VCC = 2.5V
VIN =.1V to VCC
VOUT =.1V to VCC
VCC = 5.0V (Note),
TA = 25°C, FCLK = 1 MHz
VCC = 5.5V, DSCL or MSCL = 400 kHz
VCC = 3.0V, DSDA or MSDA = DSCL
or MSCL = VCC
VCC = 5.5V, DSDA or MSDA = DSCL
or MSCL = VCCVCLK = VSS
DS21176D-page 2
2003 Microchip Technology Inc.


Part Number 24LC41A
Description 1K/4K 2.5V Dual Mode
Maker Microchip Technology
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24LC41A Datasheet PDF






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