Features
- Access time: 90ns
- Simple byte and page write
- Single 5V supply
- No external high voltages or VP-P control circuits
- Self timed
- No erase before write
- No complex programming algorithms
- No overerase problem
- Low power CMOS
- Active: 60mA
- Standby: 500μA
- Software data protection
- Protects data against system level inadvertent writes
- High-Speed page write capability
- Highly reliable Direct Write™ cell
- Endurance: 100,000 cycles
- Data retention: 100 years
- Early end of write detection
- DATA polling
- Toggle bit polling
- RoHS compliant
X28HC256 Functional Diagram
Description
The X28HC256 is a second generation high performance CMOS 32k x 8 EEPROM. It is fabricated with Intersil’s proprietary, textured poly floating gate technology, providing a highly reliable 5V only nonvolatile memory. The X28HC256 supports a 128-byte page write operation, effectively providing a 24μs/byte write cycle, and enabling the entire memory to be typically rewritten in less than 0. 8s. The X28HC256 also features DATA polling and Toggle bit polling, two methods of providing early end of write detection. The X28HC256 also supports the JEDEC standard software data protection feature for protecting against inadvertent writes during power-up and power-down. Endurance for the X28HC256 is specified as a minimum 100, 000 write cycles per byte and an inherent data retention of 100 years
Parameters
| Attributes | Value |
|---|---|
| Interface | Parallel |
| Memory Capacity (kbit) | 256 |
| Access Time (ns) | 89, 90, 120, 150 |
| Supply Voltage (V) | 4.5 - 5.5 |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| PLCC | 14.0 x 11.4 x 0.00 | 32 | 1.3 |
Application Block Diagrams
 | Humanoid Battery Management System Integrated humanoid robot BMS enabling safe, real-time power management, protection, and battery-state control. |
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| Part Number | Status | Samples | Stock | RoHS | Package | Budgetary Price (USD) | Carrier Type | Moisture Sensitivity Level (MSL) | Country of Assembly | Country of Wafer Fabrication |
|---|---|---|---|---|---|---|---|---|---|---|
| X28HC256JIZ-12 | Active | Available | In Stock | RoHS:EN | PLCC | 1ku | $58.32 | Tube | 3 | PHILIPPINES, USA | USA |
| X28HC256JIZ-12T1 | Active | N/A | Out of Stock | RoHS:EN | PLCC | 1ku | $58.32 | Reel | 3 | PHILIPPINES, USA | USA |
| X28HC256JIZ-15 | Active | Available | In Stock | RoHS:EN | PLCC | 1ku | $58.43 | Tube | 3 | PHILIPPINES, USA | USA |
| X28HC256JIZ-15T1 | Active | N/A | In Stock | RoHS:EN | PLCC | 1ku | $58.43 | Reel | 3 | PHILIPPINES, USA | USA |
| X28HC256JIZ-90 | Active | Available | Out of Stock | RoHS:EN | PLCC | 1ku | $58.43 | Tube | 3 | PHILIPPINES, USA | USA |
| X28HC256JIZ-90T1 | Active | N/A | Out of Stock | RoHS:EN | PLCC | 1ku | $58.43 | Reel | 3 | PHILIPPINES, USA | USA |
| X28HC256JZ-12 | Active | Available | Out of Stock | RoHS:EN | PLCC | 1ku | $58.43 | Tube | 3 | PHILIPPINES, USA | USA |
| X28HC256JZ-12T1 | Active | N/A | Out of Stock | RoHS:EN | PLCC | 1ku | $58.43 | Reel | 3 | PHILIPPINES, USA | USA |
| X28HC256JZ-15 | Active | Available | Out of Stock | RoHS:EN | PLCC | 1ku | $58.43 | Tube | 3 | PHILIPPINES, USA | USA |
| X28HC256JZ-15T1 | Active | N/A | Out of Stock | RoHS:EN | PLCC | 1ku | $58.43 | Reel | 3 | PHILIPPINES, USA | USA |
| X28HC256JZ-90 | Active | Available | Out of Stock | RoHS:EN | PLCC | 1ku | $58.43 | Tube | 3 | PHILIPPINES, USA | USA |
| X28HC256JZ-90T1 | Active | N/A | Out of Stock | RoHS:EN | PLCC | 1ku | $58.43 | Reel | 3 | PHILIPPINES, USA | USA |
| X28HC256JI-12 | Obsolete | N/A | Out of Stock | Contact | PLCC | Tube | 3 | |||
| X28HC256JI-15 | Obsolete | N/A | Out of Stock | Contact | PLCC | Tube | 3 | |||
| X28HC256JI-90 | Obsolete | N/A | Out of Stock | Contact | PLCC | Tube | 3 | |||
| X28HC256JI-90T1 | Obsolete | N/A | Out of Stock | Contact | PLCC | Reel | 3 | |||
| X28HC256PIZ-12 | Obsolete | N/A | Out of Stock | RoHS:EN | PDIP | 1ku | $93.02 | Tube | Not Applicable | PHILIPPINES, USA, TAIWAN | USA |
| X28HC256PIZ-15 | Obsolete | N/A | In Stock | RoHS:EN | PDIP | 1ku | $55.44 | Tube | Not Applicable | PHILIPPINES, USA, TAIWAN | USA |
| X28HC256PIZ-90 | Obsolete | N/A | Out of Stock | Contact | PDIP | Tube | Not Applicable | |||
| X28HC256PZ-12 | Obsolete | N/A | In Stock | RoHS:EN | PDIP | 1ku | $68.96 | Tube | Not Applicable | PHILIPPINES, USA, TAIWAN | USA |
| X28HC256PZ-15 | Obsolete | N/A | In Stock | RoHS:EN | PDIP | Tube | Not Applicable | |||
| X28HC256PZ-90 | Obsolete | N/A | In Stock | Contact | PDIP | Tube | Not Applicable | |||
| X28HC256SI-12 | Obsolete | N/A | Out of Stock | Contact | SOICW | Tube | 3 | |||
| X28HC256SI-90 | Obsolete | N/A | Out of Stock | Contact | SOICW | Tube | 3 | |||
| X28HC256SIZ-12 | Obsolete | N/A | Out of Stock | RoHS:EN | SOICW | Tube | 3 | |||
| X28HC256SIZ-90 | Obsolete | N/A | Out of Stock | RoHS:EN | SOICW | Tube | 3 | |||
| X28HC256SZ-12 | Obsolete | N/A | Out of Stock | RoHS:EN | SOICW | Tube | 3 |
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Required Part in Military grade application.
Dear Renesas Team,Is it possible to provide the below part in military garde application.www.renesas.com/.../x28hc256
Feb 9, 2026
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Can I connect anything to the NC pins on the X28HC64?
Question:Are the NC pins on the X28HC64 truly no connect pins? In the future I may want to change to the X28HC256 and for this reason I want to connect my CPU-A13 and CPU-A14 to these NC pins. Is there a problem? Answer:I looked at the ...
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