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Renesas X28HC256JI-90R5699
- Part No.:
- X28HC256JI-90R5699
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JI-90R5699.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,072
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Product details
Overview
X28HC256JI-90R5699 from Intersil is a 256 kbit (32k × 8) byte-alterable EEPROM operating from a single 5V supply, featuring 90 ns access time, industrial temperature range (–40°C to +85°C), and 32-lead PLCC package. It delivers high-reliability nonvolatile storage for firmware configuration, calibration data, and system parameters in embedded control modules, industrial PLCs, and telecom line cards.
For engineers reviewing the X28HC256JI-90R5699 datasheet, X28HC256JI-90R5699 pinout, X28HC256JI-90R5699 application, or X28HC256JI-90R5699 equivalent, this page provides verified technical context, pin-level design meaning, real-world application mappings, and validated alternative options for industrial-grade EEPROM selection.
Technical Context
The X28HC256JI-90R5699 implements a CMOS-based Direct Write™ floating-gate cell architecture with textured poly technology, enabling true 5V-only operation without external high-voltage programming circuits. Its dual-line control (CE/OE/WE) supports bus-shared memory arrays while eliminating contention during read/write transitions.
It integrates two early-write-completion detection methods-DATA polling on I/O7 and Toggle bit on I/O6-and supports JEDEC-standard software data protection with nonvolatile enable/disable via a 3-byte unlock sequence. Page write capability allows up to 128 consecutive bytes to be loaded before internal programming begins, reducing total rewrite time to under 0.8 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 kbit (32,768 × 8 bits); sufficient for full bootloader parameter sets or multi-channel sensor calibration tables. |
| Access time | 90 ns; enables direct interface with 8-bit microcontrollers running at ≤10 MHz without wait states. |
| Write endurance | 100,000 cycles per byte; supports field-updatable firmware metadata logging over 10+ years of daily reconfiguration. |
| Data retention | 100 years at +25°C; ensures long-term integrity of factory-programmed device IDs and security keys. |
| VCC operating range | 5 V ±10% (4.5 V to 5.5 V); compatible with standard TTL/CMOS logic rails and legacy 5V power domains. |
| Operating temperature | –40°C to +85°C; qualified for use in industrial motor drives, outdoor base stations, and automotive body control modules. |
| Page write size | 128 bytes; reduces host CPU overhead by minimizing polling frequency during bulk configuration updates. |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, dimensions 12.5 mm × 12.5 mm × 3.5 mm (N32.45x55).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selecting one of 32,768 byte locations; A7–A14 define page boundaries for 128-byte page writes. |
| I/O0–I/O7 | Bidirectional data bus | 8-bit parallel interface; I/O7 carries DATA polling status, I/O6 toggles during active write for hardware-agnostic completion detection. |
| CE | Chip Enable | Primary device select; must be LOW to activate read/write; HIGH places device in low-power standby (500 µA max). |
| OE | Output Enable | Controls output drivers during reads; HIGH disables outputs (high-Z), preventing bus contention in multi-device systems. |
| WE | Write Enable | Latches write data on falling edge; used with CE to initiate byte or page writes; no erase-before-write required. |
| VCC / VSS | Power / Ground | Single 5V supply; decoupling requires 0.1 µF ceramic capacitor per device plus 4.7 µF bulk cap per 8 devices. |
| NC (Pins 1, 12, 17, 26) | No Connect | Unbonded pins; must remain unconnected to avoid parasitic coupling or mechanical stress on leadframe. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell technology | Enables true 5V-only programming without external HV generators or complex timing sequences - simplifies PCB layout and reduces BOM count. |
| 128-byte page write | Reduces average write latency by >95% vs. byte-by-byte writes; enables full 256 kbit rewrite in <0.8 s for rapid field firmware patching. |
| DATA polling (I/O7) | Allows host to poll completion status using a single bit test - eliminates need for external interrupt lines or timer-based delays. |
| Toggle bit (I/O6) | Provides write-status feedback without saving prior address/data - ideal for multi-device arrays where address tracking adds overhead. |
| JEDEC software data protection | Nonvolatile lock activated via 3-byte sequence; prevents accidental writes during power-up/down - eliminates need for external reset supervisors. |
Applications
| Industrial PLC Configuration Storage | Telecom Line Card Calibration Data |
|---|---|
|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank; accessed during boot and runtime via 8-bit parallel bus with 90 ns read latency. Use Value: 100,000 write cycles support weekly parameter updates over 19+ years; industrial temp rating ensures reliability in uncontrolled cabinet environments. |
Use Scenario: Holding RF front-end calibration coefficients, gain settings, and channel-specific compensation values in DSLAM and optical line terminal equipment. IC Role / Device Role / Timing Role: System-critical calibration memory; written once per manufacturing calibration cycle and read at power-on. Use Value: 100-year data retention guarantees coefficient integrity across product lifetime; page write enables fast recalibration during service events. |
| Medical Device Safety Parameters | Automotive Body Control Module Settings |
|
Use Scenario: Archiving FDA-mandated safety limits, usage logs, and diagnostic fault history in Class II medical instruments such as infusion pumps and patient monitors. IC Role / Device Role / Timing Role: Tamper-resistant audit trail storage; write-protected via software algorithm after initial commissioning. Use Value: JEDEC software protection prevents unauthorized parameter changes; 5V-only operation integrates cleanly with existing 5V medical power rails. |
Use Scenario: Retaining seat/mirror position presets, lighting profiles, and door lock configurations in automotive BCMs across vehicle model years. IC Role / Device Role / Timing Role: User preference storage; updated via CAN gateway MCU during ignition cycles using burst page writes. Use Value: –40°C to +85°C rating matches automotive under-hood ambient specs; 128-byte page write minimizes CAN bus occupancy during profile sync. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-15PU | 150 ns access time; 28-pin PDIP; 100,000-cycle endurance; same 32k×8 organization and software protection. | Slower timing limits use in high-speed 8-bit bus systems; through-hole package suits legacy prototyping but not modern SMT production. | Select when board redesign is impractical and 150 ns latency is acceptable in cost-sensitive industrial controls. |
| M95256-DWMN6TP | 256 kbit SPI interface; 5 ms write cycle; SO-8 package; operates down to 1.8 V; no page write or toggle bit. | Serial interface reduces pin count but increases software overhead; lacks hardware-accelerated write status reporting. | Select for space-constrained designs where 32-pin PLCC footprint is prohibitive and SPI host resources are available. |
Compared with AT28C256-15PU and M95256-DWMN6TP, the X28HC256JI-90R5699 offers the fastest parallel access (90 ns), industrial-temp PLCC packaging, and dual hardware status reporting - making it optimal for real-time embedded systems requiring deterministic write completion and legacy bus compatibility.
Availability
X28HC256JI-90R5699 is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for X28HC256JI-90R5699 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil Corporation is a pioneer in high-reliability analog and nonvolatile memory solutions, now part of Renesas Electronics, with deep expertise in industrial-grade EEPROM design and manufacturing.
The X28HC256 family was engineered for mission-critical configuration storage in harsh environments, emphasizing write endurance, data retention, and robust power-up/down behavior without external supervision.
FAQ
What is the maximum write speed achievable with X28HC256JI-90R5699?
The X28HC256JI-90R5699 supports a 128-byte page write mode that reduces effective write time to ~24 µs per byte, enabling full 256 kbit reprogramming in under 0.8 seconds. Individual byte writes complete in ≤5 ms (tWC), and status can be confirmed via DATA polling on I/O7 or Toggle bit on I/O6 - eliminating fixed delay loops.
Does X28HC256JI-90R5699 require external high-voltage circuitry for programming?
No. The X28HC256JI-90R5699 uses Intersil's Direct Write™ floating-gate technology and operates from a single 5V supply. No external VPP, charge pumps, or high-voltage generators are needed - all write operations are self-timed and voltage-regulated internally.
How does software data protection work on X28HC256JI-90R5699?
X28HC256JI-90R5699 ships unprotected. Protection is enabled by writing three specific values (0xAA, 0x55, 0xA0) to addresses 0x5555, 0x2AAA, and 0x5555. Once set, further writes require repeating this sequence. Protection persists through power cycles and is reset only by a six-step unlock command.
Can X28HC256JI-90R5699 be used in a shared data bus with other memory devices?
Yes. Its dual-line control architecture (CE/OE/WE) allows clean bus sharing: CE selects the device, OE enables outputs, and WE controls writes. When CE is HIGH, outputs go high-Z, preventing contention - a key feature for dense memory arrays in industrial controllers and telecom hardware.
What decoupling is required for stable operation of X28HC256JI-90R5699?
Each X28HC256JI-90R5699 requires a 0.1 µF ceramic capacitor between VCC and VSS, placed as close as possible to the pins. For arrays of eight or more devices, add a 4.7 µF electrolytic bulk capacitor per group to suppress voltage droop caused by simultaneous CE activation transients.
X28HC256JI-90R5699 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
X28HC256JI-90R5699 FAQ
1.How can I place an order for X28HC256JI-90R5699 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JI-90R5699 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for X28HC256JI-90R5699 reliable?
The price and inventory of X28HC256JI-90R5699 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JI-90R5699 is usually 5 days.
3.What payment methods are accepted for X28HC256JI-90R5699?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JI-90R5699 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JI-90R5699?
X28HC256JI-90R5699 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JI-90R5699 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for X28HC256JI-90R5699?
For technical support, including X28HC256JI-90R5699 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JI-90R5699 requirements.
6.How does Aetrix verify that X28HC256JI-90R5699 is sourced from the original manufacturer or authorized distributors?
All X28HC256JI-90R5699 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that X28HC256JI-90R5699 meets industry standards.
7.What is the process for return or replacement of X28HC256JI-90R5699?
All X28HC256JI-90R5699 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JI-90R5699, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The X28HC256JI-90R5699 part is unused and in its original packaging.
Return procedure for X28HC256JI-90R5699:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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