Product Overview
ST24LC21B Serial EEPROM - 128 x 8, I2C-Compatible Bus, VESA Plug & Play, 8-Pin Plastic DIP
Condition
Unused new old stock (NOS). Sold each. Markings legible: ST logo, LC21B 6.
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Product Overview
STMicroelectronics ST24LC21B: a 1 Kbit dual mode serial EEPROM built for VESA Plug & Play, in an 8-pin plastic DIP. It holds 128 bytes through power-off and reads and writes them over a two-wire, I2C-compatible bus.
Key Features
- Memory: 1 Kbit, organized as 128 x 8
- Interface: two-wire serial, I2C compatible, 100 kHz and 400 kHz
- VESA 1 dual mode device for VESA Plug & Play
- Page write: up to 8 bytes
- Endurance: 1 million erase/write cycles
- Data retention: 40 years
- Package: 8-pin plastic DIP, through-hole
Applications
- Replacing the display identification EEPROM on a monitor or video board built around an 8-pin DIP
- Programming a fresh copy of a display's Plug & Play identification data on a bench programmer
- Holding settings, serial numbers or calibration bytes in a small I2C project on a breadboard
Frequently Asked Questions
How much does it store?
128 bytes, organized as 128 x 8 bits, written up to 8 bytes per page.
What bus speed does it support?
The two-wire, I2C-compatible bus runs at 100 kHz and 400 kHz.
Will it hold a monitor's EDID block?
Yes. A VESA EDID base block is 128 bytes, which is the full capacity of this chip.
Each piece costs less as the order grows - see the price-break table on this page.
Before a VESA Plug & Play monitor shows its first picture, an EEPROM like this one has already told the computer who it is. A bench programmer decides what it says next.
