May.28, 2009
Dual Port EEPROM for EDID*1
Capable of managing two HDMI*2 terminals with one memory
| Product Name | LE24CBK22M |
|---|---|
| Sample Shipping | May 2009 |
| Production Plan | 1M / month |
| Sample Price | $1.00 |
SANYO Semiconductor Co., Ltd. has developed the Dual Port EEPROM which is ideal for storing the extended display identification data (EDID) of HDMI terminals. The Dual Port EEPROM, LE24CBK22M, is capable of performing functions of two EEPROMs in one small package. Usually one memory for EDID is required per one HDMI terminal; however, using the Dual Port EEPROM makes it possible to deal with two HDMI terminals with one memory. The Dual Port EEPROM reduces the number of parts as well as the mounting space by half. It also contributes to making the unit smaller by minimizing the board space and reducing the area around the HDMI terminal. Integrating two memories into one package leads to cost and energy saving.
*1 EDID (Extended Display Identification Data): Information for each display such as display resolution and clock type.
*2 HDMI (High-Definition Multimedia Interface): Interface standard for image input-output terminal installed in digital image device. Since it outputs digital signal without change, video data will not be degraded.
Product Main Features
- Two EDID sets stored in one EEPROM.
This product can read and write from two separate ports, thereby reducing the number of parts, mounting space and production cost. The Dual Port EEPROM is capable of replacing the conventional method of storing two EDID sets in one EEPROM without any major design change. - Pin to Pin compatible EEPROM.
This product has the same pin configuration and the same package size as the 8-pin standard EEPROM. Existing products can easily be replaced with the new Dual Port EEPROM and writing with general ROM writers is possible. - Write efficiency is doubled in combined mode operation.
In combined mode operation, the two separate ports operate as one sequential memory port. This enables to write display information for two terminals at the same time through Port 1 significantly reducing the writing time.
Operation Methods
- Normal Mode
During normal mode operation, Bank1 (2Kbit) memory region in which reading and writing are performed through SCL1/SDA1 and Bank2 (2Kbit) memory region in which reading and writing are performed through SCL2/SDA2 are handled separately (Fig. 1). Equivalent operation of two memories for EDID is possible with one Dual Port EEPROM. - Combined Mode
Combined mode operation is available during the write operation. Bank1 (2Kbit) and Bank2 (2Kbit) are integrated and treated as one memory of 4Kbit thus reducing the writing time. Writing is performed through the SCL1/SDA1 ports (Fig. 2).
Specifications
- Capacity: 2Kbit (256×8bit) + 2Kbit (256×8bit) 4Kbit in total
- Bank structure: 2 bank (2Kbit+2Kbit)
- Single power supply: 2.5V to 5.5V
- Interface: 2-wire serial (I²C DDC2)
- Maximum frequency: 400kHz
- Low power consumption: Stand-by 2µA(Max.) Active 0.5mA(Max.)
- Page write function: 16bytes
- Read function: Sequential read, Random read
- Writing endurance: 1milion times
- High reliability: SANYO's original symmetric memory array structure (USP6947325) adopted
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*The information presented in this press release, including device specifications, is current as of the date of this press release. Note, however, that this information is subject to change without notice and thus at later dates the current state may differ in certain details from the content presented here.
