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Renesas X28HC256JI-90R5420
- Part No.:
- X28HC256JI-90R5420
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JI-90R5420.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,209
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Product details
Overview
X28HC256JI-90R5420 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable CMOS EEPROM with 90 ns access time, -40°C to +85°C industrial temperature range, and 32-lead PLCC package. It implements Direct Write™ floating-gate technology for high reliability, supports 128-byte page writes completing in <0.8 s, and integrates DATA polling and Toggle bit status detection for efficient write-cycle management in embedded control systems.
For engineers reviewing the X28HC256JI-90R5420 datasheet, X28HC256JI-90R5420 pinout, X28HC256JI-90R5420 application, or X28HC256JI-90R5420 equivalent, key selection considerations include industrial-grade temperature operation, JEDEC software data protection compliance, 100,000 write-cycle endurance, 100-year data retention, and compatibility with standard 5V microcontroller buses requiring no external high-voltage programming circuitry.
Technical Context
The X28HC256JI-90R5420 uses textured poly floating-gate technology enabling single 5V supply operation without erase-before-write or complex programming algorithms. Its dual-line control architecture (CE/OE/WE) eliminates bus contention in multi-device memory arrays and supports both CE-controlled and WE-controlled write cycles with address latching on the last falling edge.
It implements two hardware-level write-inhibit mechanisms-default VCC sense (inhibits writes below ~3.5 V) and signal-level inhibition (via CE HIGH, OE LOW, or WE HIGH)-plus nonvolatile software data protection activated via a three-byte sequence to addresses 5555H/2AAAH/5555H. Early write completion is signaled via I/O7 (DATA polling) or I/O6 (Toggle bit), both conforming to read-cycle timing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8 bits); supports full memory rewrite via 128-byte page writes in under 0.8 s |
| Access time | 90 ns; enables direct interfacing with 10 MHz microcontrollers without wait states |
| Operating voltage | 5 V ±10%; operates from single rail-no charge pump or external VPP required |
| Endurance | 100,000 write cycles per byte; validated per JEDEC standards for long-life embedded logging |
| Data retention | 100 years at +25°C; specified per manufacturer characterization across industrial temperature range |
| Temperature range | -40°C to +85°C; qualified for industrial control, automotive body electronics, and factory automation |
| Power consumption | 60 mA active current; 500 µA standby current-supports low-power sleep modes in battery-backed systems |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, dimensions 12.57 mm × 15.11 mm × 3.55 mm (JEDEC MS-016AE, pkg drawing N32.45x55).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selecting one of 32,768 bytes; compatible with standard 8-bit microcontroller address/data multiplexing schemes |
| I/O0–I/O7 | Bidirectional data bus | 8-bit parallel interface; supports true read-modify-write operations and status bit polling (I/O6/I/O7) |
| CE | Chip Enable | Active-low primary device select; places device in standby (500 µA) when HIGH, enabling multi-chip memory decoding |
| OE | Output Enable | Active-low output gate control; used with CE to initiate reads and prevent bus contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches data on rising edge (with CE) and initiates internal self-timed programming cycle |
| VCC / VSS | Power / Ground | +5 V supply and return; requires local 0.1 µF ceramic decoupling per device per datasheet layout guidance |
| NC (Pins 1, 12, 17, 26) | No Connect | Unbonded terminals; must remain unconnected-no routing or grounding permitted |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell technology | Enables reliable 5V-only operation with no overerase risk or erase-before-write requirement |
| 128-byte page write capability | Reduces total system write time by >95% vs. byte-by-byte writes-critical for firmware update and configuration storage |
| DATA polling (I/O7) & Toggle bit (I/O6) | Eliminates fixed delay waits; allows host CPU to poll status in-line without interrupts or external timing components |
| JEDEC-standard software data protection | Nonvolatile lock activated via 3-byte sequence; prevents accidental writes during power transitions or firmware bugs |
| Hardware write inhibit | VCC sense + signal-level gating (CE/OE/WE) ensures data integrity during brown-out, reset, and hot-plug events |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Storing calibrated sensor offsets, actuator limits, and user preferences in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed during boot and runtime via 8-bit parallel bus; 90 ns access enables real-time parameter updates. Use Value: 100,000 write cycles support daily calibration logs over 27 years; -40°C to +85°C rating ensures operation inside unheated control cabinets. |
Use Scenario: Retaining door lock settings, mirror positions, and lighting profiles across ignition cycles in automotive BCMs. IC Role / Device Role / Timing Role: Dedicated EEPROM for user-configurable parameters; interfaces directly to 8-bit MCU without level shifters or voltage translators. Use Value: Software data protection prevents corruption during vehicle battery disconnect/reconnect; 100-year retention guarantees lifetime parameter persistence. |
| Medical Infusion Pump Calibration Data | Telecom Base Station Bootloader Parameters |
|
Use Scenario: Storing flow-rate calibration coefficients, safety thresholds, and maintenance counters in Class II medical devices requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-required audit logs; accessed only during service mode or calibration routines. Use Value: Hardware + software write protection meets IEC 62304 SW safety requirements; 5V-only operation simplifies isolated power design. |
Use Scenario: Holding FPGA configuration checksums, radio channel maps, and fail-safe boot parameters in outdoor telecom equipment. IC Role / Device Role / Timing Role: Critical boot-time memory mapped to MCU's lower address space; 90 ns access avoids boot delays in time-sensitive 5G infrastructure. Use Value: PLCC package withstands thermal cycling in sealed outdoor enclosures; 100,000-cycle endurance supports field firmware upgrades over 10+ years. |
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; PDIP-28 package; 100,000-cycle endurance; same 32k×8 organization and 5V operation | Slower timing limits use with high-speed MCUs; through-hole PDIP requires wave-solder assembly | Select when legacy board layout or cost-sensitive commercial-temp (-20°C to +85°C) operation is prioritized over speed or surface-mount compatibility |
| M95256-DW DW | Serial SPI interface; 5 ms write cycle; SO8 package; 400 kHz clock; 100,000-cycle endurance | Requires SPI controller and software driver; no parallel bus interface; lower pin count but higher latency per byte | Select when PCB space is constrained and system already uses SPI peripherals-trade parallel speed for footprint reduction |
Compared with AT28C256-15PU and M95256-DW DW, the X28HC256JI-90R5420 delivers faster 90 ns random access and native PLCC surface-mount compatibility for industrial designs requiring deterministic timing and thermal robustness, while retaining identical endurance and retention specs.
Availability
X28HC256JI-90R5420 is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive body control modules, medical infusion pump calibration data, and telecom base station bootloader parameters requiring stable component supply across extended product lifecycles.
Supply support for X28HC256JI-90R5420 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 semiconductor company specializing in power management and precision analog ICs, acquired by Renesas Electronics in 2017. Its legacy EEPROM portfolio emphasizes reliability, industrial qualification, and ease of integration.
The X28HC256JI-90R5420 belongs to Intersil's second-generation CMOS EEPROM family designed for mission-critical nonvolatile storage in industrial automation, automotive subsystems, and medical instrumentation where data integrity and long-term retention are mandatory.
FAQ
What is the maximum operating temperature range for the X28HC256JI-90R5420?
The X28HC256JI-90R5420 is rated for industrial operation from -40°C to +85°C. This range is validated per the manufacturer's recommended operating conditions and applies to all DC and AC electrical specifications-including 90 ns access time, 60 mA active current, and 100,000 write-cycle endurance-without derating. The device remains functional up to +150°C in storage but must operate within the -40°C to +85°C ambient range for guaranteed performance.
Does the X28HC256JI-90R5420 require external high-voltage programming circuitry?
No, the X28HC256JI-90R5420 operates from a single 5 V ±10% supply and requires no external high-voltage programming circuitry. Its Direct Write™ floating-gate technology enables byte and page writes using only standard TTL/CMOS logic levels on CE, OE, and WE. All internal programming voltages are generated on-chip, eliminating need for VPP pins, charge pumps, or external boost converters-simplifying system design and reducing BOM cost.
How does software data protection work on the X28HC256JI-90R5420?
Software data protection on the X28HC256JI-90R5420 is enabled by writing three specific values-0xAA to address 5555H, 0x55 to address 2AAAH, then 0xAA to address 5555H-within a single page write window. Once set, the device enters a nonvolatile protected state that blocks all subsequent writes until the six-step reset sequence is executed. This feature prevents inadvertent writes during power-up/down and runtime faults without requiring external hardware.
What are the valid pin-compatible alternatives to the X28HC256JI-90R5420 in PLCC-32?
No pin-compatible alternatives exist for the X28HC256JI-90R5420 in the PLCC-32 package with identical 90 ns access time and industrial temperature grade. Other Intersil variants like X28HC256JZ-90 are commercial-grade (0°C to +70°C), while third-party equivalents (e.g., ST M28C256B) use different pinouts and lack validated 90 ns timing. Migration requires PCB redesign unless substituting into existing PLCC footprints with relaxed timing or temp requirements.
Can the X28HC256JI-90R5420 be used in a 3.3 V system?
The X28HC256JI-90R5420 is specified exclusively for 5 V ±10% operation and is not rated for 3.3 V supply. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive strength (VOH = 2.4 V @ -4 mA, VOL = 0.4 V @ 6 mA) assume 5 V rails. Interfacing with 3.3 V MCUs requires level translation on all control and data lines, and VCC must remain at 5 V. Using 3.3 V on VCC violates absolute maximum ratings and risks data corruption or premature wear.
X28HC256JI-90R5420 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-90R5420 FAQ
1.How can I place an order for X28HC256JI-90R5420 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JI-90R5420 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-90R5420 reliable?
The price and inventory of X28HC256JI-90R5420 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JI-90R5420 is usually 5 days.
3.What payment methods are accepted for X28HC256JI-90R5420?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JI-90R5420 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JI-90R5420?
X28HC256JI-90R5420 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JI-90R5420 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-90R5420?
For technical support, including X28HC256JI-90R5420 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JI-90R5420 requirements.
6.How does Aetrix verify that X28HC256JI-90R5420 is sourced from the original manufacturer or authorized distributors?
All X28HC256JI-90R5420 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-90R5420 meets industry standards.
7.What is the process for return or replacement of X28HC256JI-90R5420?
All X28HC256JI-90R5420 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JI-90R5420, 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-90R5420 part is unused and in its original packaging.
Return procedure for X28HC256JI-90R5420:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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