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Renesas X28HC256JI-90R5697
- Part No.:
- X28HC256JI-90R5697
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JI-90R5697.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,055
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Product details
Overview
X28HC256JI-90R5697 from Intersil is a 256 kbit (32k × 8) byte-alterable EEPROM operating at 5V, featuring 90 ns access time, -40°C to +85°C industrial temperature range, and 32-lead PLCC RoHS-compliant package. It delivers high-reliability nonvolatile storage for firmware configuration, calibration data, and system parameter retention in embedded controllers and industrial PLCs.
For engineers reviewing the X28HC256JI-90R5697 datasheet, X28HC256JI-90R5697 pinout, X28HC256JI-90R5697 application, or X28HC256JI-90R5697 equivalent, key selection criteria include its 100,000 write-cycle endurance, 100-year data retention, 128-byte page write capability, JEDEC software data protection, and dual polling (DATA/Toggle bit) for write completion detection.
Technical Context
The X28HC256JI-90R5697 implements a CMOS-based Direct Write™ floating-gate cell architecture with textured poly technology, enabling single 5V-only operation without external high-voltage programming circuits. Its control logic supports both CE- and WE-controlled write cycles, with address latching on the later falling edge of CE or WE.
It features two independent early-write-detection mechanisms: DATA polling on I/O7 (complement read during programming) and Toggle bit polling on I/O6 (state alternation during internal write). The device also integrates hardware VCC-sense write inhibition below ~3.5V and software data protection activated via a three-byte unlock sequence to A5555H/A2AAAH/A5555H.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8), sufficient for full bootloader configuration 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 daily field firmware updates over 27 years |
| Data retention | 100 years at +25°C - ensures long-term reliability in unattended infrastructure equipment |
| Page write size | 128 bytes - reduces total rewrite time for full memory to <0.8 s, critical for fast factory programming |
| Supply voltage | 5 V ±10% - compatible with legacy 5V logic systems and industrial power rails |
| Operating temperature | -40°C to +85°C - qualified for use in motor drives, HVAC controllers, and outdoor telecom units |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, body size 12.5 mm × 12.5 mm (N32.45x55).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selecting one of 32,768 bytes; A7–A14 define page boundaries for 128-byte writes |
| I/O0–I/O7 | Bidirectional data bus | 8-bit parallel interface; I/O6 provides toggle-bit status, I/O7 provides data-polling status during writes |
| CE | Chip Enable | Active-low primary device select; must be LOW for all read/write operations; controls standby current (500 µA) |
| OE | Output Enable | Active-low read strobe; used with CE to eliminate bus contention in multi-device memory arrays |
| WE | Write Enable | Active-low write strobe; latches data on rising edge; initiates byte or page write when CE is also LOW |
| VCC | Power supply | +5 V supply pin; decoupling requires 0.1 µF ceramic capacitor per device to suppress transient spikes |
| VSS | Ground | Reference ground for all signals and power; must be low-impedance connection in high-density arrays |
| NC (Pins 1, 12, 17, 26) | No connect | Unbonded pins; must remain unconnected per datasheet to avoid parametric shift or latch-up risk |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell technology | Eliminates erase-before-write requirement, enabling true byte-alterable operation without block erasure overhead |
| 128-byte page write | Reduces average write time to 24 µs/byte, accelerating full-memory reprogramming by >10× vs. byte-by-byte writes |
| DATA and Toggle bit polling | Enables software-driven write completion detection without external interrupt lines or timing loops |
| JEDEC software data protection | Prevents inadvertent writes during power-up/down via nonvolatile lock activated by 3-byte unlock sequence |
| Hardware VCC sense | Automatically inhibits all write functions when VCC drops below ~3.5 V, preventing corruption during brownout |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed during boot and runtime via 8-bit parallel bus. Use Value: 100,000 write cycles support weekly firmware updates over 19+ years; 100-year retention eliminates recalibration drift concerns. |
Use Scenario: Holding sensor offset/gain coefficients and regulatory compliance logs in portable diagnostic equipment requiring FDA audit trails. IC Role / Device Role / Timing Role: Secure parameter vault with software protection enabled to prevent accidental overwrite during battery swaps. Use Value: Dual polling (I/O6/I/O7) allows deterministic write verification without adding watchdog timers or extra GPIOs. |
| Telecom Base Station Bootloader Parameters | Automotive Body Control Module Settings |
Use Scenario: Storing RF calibration constants, MAC addresses, and fail-safe boot images in 4G/LTE remote radio units operating outdoors. IC Role / Device Role / Timing Role: High-reliability configuration store interfaced to ARM Cortex-M4 host via standard parallel memory bus. Use Value: -40°C to +85°C rating ensures stable operation across desert-to-arctic ambient ranges; 90 ns access avoids CPU wait states. |
Use Scenario: Saving user preferences (mirror position, seat memory), fault codes, and adaptive learning values in vehicle body domain controllers. IC Role / Device Role / Timing Role: Endurance-critical NV storage accessed during ignition-on initialization and periodic background logging. Use Value: Hardware VCC sense prevents data corruption during engine cranking voltage sag; page write accelerates ECU reprogramming. |
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 cycles, no built-in software protection | Limited to commercial temp (0°C to +70°C); lacks toggle-bit polling and JEDEC software lock | Choose for cost-sensitive, non-industrial designs where slower speed and simpler protection suffice |
| MX28F256J3F-90 | 90 ns access, 32-pin PLCC, but flash-based (sector erase required), 100,000 cycles, no byte-alterable writes | Requires full-sector erase before rewrite; incompatible with dynamic byte-level updates | Use only if migrating to flash architecture; not a functional substitute for true EEPROM behavior |
Compared with AT28C256-15PU and MX28F256J3F-90, the X28HC256JI-90R5697 uniquely combines industrial temperature rating, true byte-alterability, dual polling, and JEDEC-standard software protection-making it irreplaceable in safety-critical or field-upgradable embedded systems requiring guaranteed write atomicity and long-term data integrity.
Availability
X28HC256JI-90R5697 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, telecom base stations, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for X28HC256JI-90R5697 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 leading provider of precision analog and power management ICs, with deep expertise in nonvolatile memory design for industrial and infrastructure markets.
The X28HC256JI-90R5697 belongs to Intersil's second-generation CMOS EEPROM product line, engineered specifically for robust, 5V-only operation in harsh environments where data integrity and long-term reliability are non-negotiable.
FAQ
What is the maximum write cycle time for X28HC256JI-90R5697 during a byte write operation?
The maximum write cycle time (tWC) for X28HC256JI-90R5697 is 5 ms under typical conditions. This is the longest time the device requires to complete an internal write after initiation. However, using DATA polling on I/O7 or Toggle bit polling on I/O6 allows the host to detect completion earlier, reducing effective write latency significantly. The X28HC256JI-90R5697 does not require fixed timeout delays when polling is implemented correctly.
Does X28HC256JI-90R5697 support true byte-alterable writes without prior erase?
Yes, X28HC256JI-90R5697 supports true byte-alterable writes with no erase-before-write requirement. Its Direct Write™ floating-gate cell architecture enables direct modification of any individual byte while leaving adjacent bytes unchanged. This eliminates sector/block erase overhead and guarantees atomic updates-critical for real-time systems where partial writes must never corrupt valid data.
How does software data protection work on X28HC256JI-90R5697?
Software data protection on X28HC256JI-90R5697 is activated by writing three specific values (0xAA, 0x55, 0xA0) to addresses 0x5555, 0x2AAA, and 0x5555 respectively. Once set, the device enters a locked state where further writes require repeating this sequence. The lock is nonvolatile and persists through power cycles. To disable it, a six-step reset sequence must be executed, after which X28HC256JI-90R5697 returns to standard operation.
What is the purpose of the NC pins on X28HC256JI-90R5697's 32-lead PLCC package?
The NC (No Connect) pins on X28HC256JI-90R5697-located at positions 1, 12, 17, and 26-are internally unbonded and electrically isolated. They must remain unconnected in PCB layout to prevent parasitic coupling, signal integrity degradation, or potential latch-up. These pins exist solely for mechanical symmetry and package compatibility; routing traces or applying voltage to them violates the device's absolute maximum ratings and may impair reliability.
Can X28HC256JI-90R5697 be used in place of older X28HC256JZ-90 variants?
Yes, X28HC256JI-90R5697 is functionally and pin-compatible with X28HC256JZ-90, differing only in temperature grade: JI denotes -40°C to +85°C industrial qualification, while JZ specifies 0°C to +70°C commercial operation. Both share identical timing (90 ns), package (32-lead PLCC), pinout, and feature set. No PCB or firmware changes are needed when upgrading from JZ to JI for enhanced environmental robustness.
X28HC256JI-90R5697 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Bulk
- 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-90R5697 FAQ
1.How can I place an order for X28HC256JI-90R5697 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JI-90R5697 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-90R5697 reliable?
The price and inventory of X28HC256JI-90R5697 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JI-90R5697 is usually 5 days.
3.What payment methods are accepted for X28HC256JI-90R5697?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JI-90R5697 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JI-90R5697?
X28HC256JI-90R5697 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JI-90R5697 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-90R5697?
For technical support, including X28HC256JI-90R5697 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JI-90R5697 requirements.
6.How does Aetrix verify that X28HC256JI-90R5697 is sourced from the original manufacturer or authorized distributors?
All X28HC256JI-90R5697 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-90R5697 meets industry standards.
7.What is the process for return or replacement of X28HC256JI-90R5697?
All X28HC256JI-90R5697 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JI-90R5697, 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-90R5697 part is unused and in its original packaging.
Return procedure for X28HC256JI-90R5697:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
X28HC256JI-90R5697 Tags
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