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Description
MICROCHIP AT28C256-15SU EEPROM, Parallel, 256 Kbit, 32K x 8bit, 5 MHz, WSOIC, 28 PinsThe AT28C256 15SU is a 256k high performance Electrically Erasable and Programmable Read Only Memory (EEPROM) organized as 32768 words by 8 bit. Manufactured with Atmels advanced nonvolatile CMOS technology, the device offers access times to 150 ns with power dissipation of just 440mW. When the device is deselected, the CMOS standby current is less than 200A. The AT28C256 is accessed like a static RAM for the read or write cycle without the need for
The AT28C256-15SU is a 256k high-performance Electrically Erasable and Programmable Read-Only Memory (EEPROM) organized as 32768 words by 8-bit. Manufactured with Atmels advanced nonvolatile CMOS technology, the device offers access times to 150 ns with power dissipation of just 440mW. When the device is deselected, the CMOS standby current is less than 200µA. The AT28C256 is accessed like a static RAM for the read or write cycle without the need for external components. The device contains a 64-byte page register to allow writing of up to 64-byte simultaneously. During a write cycle, the addresses and 1 to 64-byte of data are internally latched, freeing the address and data bus for other operations. Following the initiation of a write cycle, the device will automatically write the latched data using an internal control timer. The end of a write cycle can be detected by DATA Polling of I/O7. Once the end of a write cycle has been detected a new access for a read or write can begin.
- Fast read access time - 150ns
- Automatic page write operation
- Internal control timer
- Fast write cycle times
- Low power dissipation
- Hardware and software data protection
- Data polling for end of write detection
- High reliability CMOS technology
- Endurance - 10? or 10? cycles
- Data retention - 10 years
- CMOS and TTL Compatible inputs and outputs
- JEDEC Approved byte-wide pinout
- Green product and no Sb/Br
Applications
Computers & Computer Peripherals, Industrial, Aerospace, Defence, Military
Product details
| Operating Temperature Min | -40°C |
| Operating Temperature Max | 85°C |
| Clock Frequency | 5MHz |
| No. of Pins | 28Pins |
| Memory Size | 256Kbit |
| Product Range | 256Kbit Serial Parallel EEPROMs |
| Memory Case Style | WSOIC |
| Supply Voltage Min | 4.5V |
| IC Interface Type | Parallel |
| EEPROM Memory Configuration | 32K x 8bit |
| Packaging | Each |
| Supply Voltage Max | 5.5V |
| MSL | MSL 3 - 168 hours |
Other details
| Brand | MICROCHIP |
| Part Number | AT28C256-15SU |
| Quantity | Each |
| Technical Data Sheet EN | |
| Product Change Notice EN |
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. Image is for illustrative purposes only. Please refer to product description.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 5
Super comfy
Color: Soft, Size: Queen(28"×16"×5.9")
Absolutely love this pillow! It’s incredibly soft, supportive, and stays cool throughout the night. I’ve been sleeping much better since getting it. Great quality, perfect firmness, and definitely worth every penny.
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Reviewed in the United States on May 19, 2026
★★★★★ 5
Soft pillow
Color: Soft, Size: Standard(24"×16"×5.5")
This latex pillow has been a great addition to my sleep routine. It offers the perfect balance of softness and support, especially side sleeping. I noticed less pressure on my neck and shoulders after using it. I also like that it’s made with natural latex and free from harsh memory foam chemicals. The removable cover is convenient, and the packaging makes it feel like a premium product.
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Reviewed in the United States on May 16, 2026
★★★★★ 5
Perfect Balance of Comfort & Support!
Color: Soft, Size: Standard(24"×16"×5.5")
I absolutely love this pillow! The Talalay latex feels incredibly supportive while still being soft and comfortable. Unlike memory foam, it doesn't trap heat or give off any chemical smell-just clean, natural comfort.
I've noticed a huge difference in my sleep quality; it relieves pressure from my neck and shoulders, and I wake up without stiffness.
The Tencel cover is smooth, breathable, and removable for easy washing, which makes it feel extra fresh. The packaging was beautiful, making it feel like a premium gift right out of the box.
If you're looking for a high-quality natural pillow that's supportive, durable, and chemical-free, this is it. Highly recommend!
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Reviewed in the United States on August 31, 2025
★★★★★ 3
Hard to judge thickness with only dimensions to go by
Color: Soft, Size: Standard(24"×16"×5.5")
Very nice quality, just what I hoped for. But it's just too thick for me. I'm thinking of using my electric knife to try to skim enough off to be usable. I've slept most of my life on latex pillows and have not enjoyed using other pillows.
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Reviewed in the United States on February 3, 2026
★★★★★ 4
Good pillow, but too high for my neck
Color: Soft, Size: Standard(24"×16"×5.5")
I love the Talalay latex for the quality, and that there is no smell. However, it is too high for my neck. I wish the company would make it in a 3" version, instead of just 5.5". They do have a "slim" version, but it is not even the same kind of pillow. It measures 2.5" and the back side is completely flat, so you can not turn it in over for use. The company basically took this 5.5" version and cut it in half for the slim.
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Reviewed in the United States on June 7, 2025