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LR24C08 Schematic ( PDF Datasheet ) - LRC

Teilenummer LR24C08
Beschreibung Two-wire Serial EEPROM
Hersteller LRC
Logo LRC Logo 




Gesamt 15 Seiten
LR24C08 Datasheet, Funktion
LESHAN RADIO COMPANY, LTD.
2K bits (256 X 8) / 4K bits (512 X 8) / 8K bits (1024 X 8) / 16K bits (2048 X 8)
Two-wire Serial EEPROM
LR24C02/LR24C04/LR24C08/LR24C16
Features
Two-wire Serial Interface
VCC = 1.8V to 5.5V
Bi-directional Data Transfer Protocol
Internally Organized
LR24C02, 256 X 8 (2K bits)
LR24C04, 512 X 8 (4K bits)
LR24C08, 1024 X 8 (8K bits)
LR24C16, 2048 X 8 (16K bits)
1 MHz (5V), 400 kHz (1.8V, 2.5V, 2.7V) Compatibility
8-byte Page (2K), 16-byte Page (4K, 8K, 16K) Write Modes
Self-timed Write Cycle (5 ms max)
1 Million Write Cycles guaranteed
Data Retention > 100 Years
Operating Temperature: -40 to +85
8-lead PDIP, 8-lead SOP and 8-lead TSSOP Packages
Ordering Infomation
LR24Cxx: PDIP8
LR24CxxD: SOP8
LR24CxxT: TSSOP8
Description
LR24C02/LR24C04/LR24C08/LR24C16 provides 2048/4096/8192/16384 bits of serial electrically
erasable and programmable read-only memory (EEPROM) organized as 256/512/1024/2048 words of 8
bits each. The device is optimized for use in many industrial and commercial applications where
low-power and low-voltage operations are essential. The LR24C02/LR24C04/LR24C08/LR24C16 is
available in space-saving 8-lead PDIP, 8-lead SOP, and 8-lead TSSOP packages and is accessed via a
two-wire serial interface.
Pin Descriptions
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LR24C08 Datasheet, Funktion
A0 pin is no connect.
LESHAN RADIO COMPANY, LTD.
The 8K EEPROM only uses the A2 device address bit with the next 2 bits being for memory page
addressing. The A2 bit must compare to its corresponding hard-wired input pin. The A1 and A0 pins are
no connect.
The 16K does not use any device address bits but instead the 3 bits are used for memory page
addressing. These page addressing bits on the 4K, 8K and 16K devices should be considered the most
significant bits of the data word address which follows. The A0, A1 and A2 pins are no connect.
The eighth bit of the device address is the read/write operation select bit. A read operation is initiated if
this bit is high and a write operation is initiated if this bit is low.
Upon a compare of the device address, the EEPROM will output a "0". If a compare is not made, the chip
will return to a standby state.
Write Operations
BYTE WRITE: A write operation requires an 8-bit data word address following the device address word
and acknowledgment. Upon receipt of this address, the EEPROM will again respond with a "0" and then
clock in the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a "0"
and the addressing device, such as a microcontroller, must terminate the write sequence with a stop
condition. At this time the EEPROM enters an internally timed write cycle, tWR, to the nonvolatile
memory. All inputs are disabled during this write cycle and the EEPROM will not respond until the write is
complete (see Figure 5 on page 7).
PAGE WRITE: The 2K EEPROM is capable of an 8-byte page write, and the 4K, 8K and 16K devices are
capable of 16-byte page writes.
A page write is initiated the same as a byte write, but the microcontroller does not send a stop condition
after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first data
word, the microcontroller can transmit up to seven (2K) or fifteen (4K, 8K, 16K) more data words. The
EEPROM will respond with a "0" after each data word received. The microcontroller must terminate the
page write sequence with a stop condition (see Figure 6 on page 7).
The data word address lower three (2K) or four (4K, 8K, 16K) bits are internally incremented following the
receipt of each data word. The higher data word address bits are not incremented, retaining the memory
page row location. When the word address, internally generated, reaches the page boundary, the
following byte is placed at the beginning of the same page. If more than eight (2K) or sixteen (4K, 8K,
16K) data words are transmitted to the EEPROM, the data word address will "roll over" and previous data
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6 Page









LR24C08 pdf, datenblatt
Package Information
8-lead PDIP Outline Dimensions
LESHAN RADIO COMPANY, LTD.
SYMBOL
A
A2
b
B1
c
c1
D
E1
e
eA
L
MILLIMETER
MIN
NOM
MAX
3.60 3.80 4.00
3.10 3.30 3.50
0.44 - 0.53
1.52BSC
0.25 - 0.31
0.24 0.25 0.26
9.05 9.25 9.45
6.15 6.35 6.55
2.54BSC
7.62BSC
3.00 -
-
12/15

12 Page





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