Datenblatt-pdf.com


AX24C02A Schematic ( PDF Datasheet ) - AXElite

Teilenummer AX24C02A
Beschreibung 2K/4K/8K/16K-bit 2-WIRE SERIAL CMOS EEPROM
Hersteller AXElite
Logo AXElite Logo 




Gesamt 16 Seiten
AX24C02A Datasheet, Funktion
AX24C02A/04A/08A/16A
2K/4K/8K /16K-bit 2-WIRE SERIAL CMOS EEPROM
GENERAL DESCRIPTIO
The AX24C02A/04A/08A/16A 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 operation are essential. The
AX24C02A/04A/08A/16A is available in space-saving
SOP-8, TSSOP-8, DFN-8 and SOT23-5 packages and
is accessed via a two-wire serial interface.
FEATURES
Wide Voltage Operation
- VCC = 1.8V to 5.5V
Operating Ambient Temperature: -40°C to +85°C
Internally Organized:
- AX24C02A, 256 X 8 (2K bits)
- AX24C04A, 512 X 8 (4K bits)
- AX24C08A, 1024 X 8 (8K bits)
- AX24C16A, 2048 X 8 (16K bits)
Two-wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise
Suppression
Bidirectional Data Transfer Protocol
1 MHz (5V), 400 kHz (1.8V, 2.5V, 2.7V)
Compatibility
Write Protect Pin for Hardware Data Protection
8-byte Page (2K), 16-byte Page (4K, 8K,16K)
Write Modes
Partial Page Writes Allowed
Self-timed Write Cycle (5 ms max)
High-reliability
- Endurance: 1 Million Write Cycles
- Data Retention: 100 Years
SOP-8, TSSOP-8, DFN-8 and SOT23-5
packages
PIN ASSIGNMENT (Top-View)
SOP-8
TSSOP-8
TDFN-8
SOT23-5
PIN CONFIGURATION
Pin Name
A0 - A2
SDA
SCL
WP
GND
VCC
Functions
Address Inputs
Serial Data
Serial Clock Input
Write Protect
Ground
Power Supply
1/16
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.22, 2011






AX24C02A Datasheet, Funktion
AX24C02A/04A/08A/16A
Device Addressing
The 2K, 4K, 8K and 16K EEPROM devices all require an 8-bit device address word following a start condition
to enable the chip for a read or write operation (see to Figure 4).
The device address word consists of a mandatory "1", "0" sequence for the first four most significant bits as
shown. This is common to all the Serial EEPROM devices.
The next 3 bits are the A2, A1 and A0 device address bits for the 2K EEPROM. These 3 bits must compare to
their corresponding hardwired input pins.
The 4K EEPROM only uses the A2 and A1 device address bits with the third bit being a memory page address
bit. The two device address bits must compare to their corresponding hardwired input pins. The A0 pin is no
connect.
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).
PAGE WRITE: The 2K EEPROM is capable of an 8-byte page write, and the 4K, 8K and16K 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).
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 will be overwritten.
ACKNOWLEDGE POLLING: Once the internally timed write cycle has started and the EEPROM inputs are
disabled, acknowledge polling can be initiated. This involves sending a start condition followed by the device
address word. The read/write bit is representative of the operation desired. Only if the internal write cycle has
completed will the EEPROM respond with a "0", allowing the read or write sequence to continue.
6/16
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.22, 2011

6 Page









AX24C02A pdf, datenblatt
AX24C02A/04A/08A/16A
Bus Timing
Figure 10: SCL: Serial Clock, SDA: Serial Data I/O
Write Cycle Timing
Figure 11: SCL: Serial Clock, SDA: Serial Data I/O
Note
The write cycle time tWR is the time from a valid stop condition of a write sequence to the end of the internal
clear/write cycle.
12/16
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Jul.22, 2011

12 Page





SeitenGesamt 16 Seiten
PDF Download[ AX24C02A Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
AX24C02A2K/4K/8K/16K-bit 2-WIRE SERIAL CMOS EEPROMAXElite
AXElite

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche