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Renesas X28HC256JIZ-15
- Part No.:
- X28HC256JIZ-15
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JIZ-15.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,062
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Product details
Overview
X28HC256JIZ-15 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable CMOS EEPROM with 150 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 parameters in embedded controllers and industrial PLCs.
For engineers reviewing the X28HC256JIZ-15 datasheet, X28HC256JIZ-15 pinout, X28HC256JIZ-15 application, or X28HC256JIZ-15 equivalent, key selection criteria include its 100,000 write-cycle endurance, 100-year data retention, page-write capability (128-byte burst), DATA/Toggle bit polling support, and JEDEC-standard software data protection - all under single 5V supply operation without external high-voltage circuitry.
Technical Context
The X28HC256JIZ-15 implements a direct-write floating-gate EEPROM cell architecture using textured poly technology, enabling true byte-level alterability without prior erase. Its dual-line control (CE/OE/WE) supports bus-shared memory arrays while eliminating contention during read/write transitions.
It features two hardware-based early-write-detection mechanisms: DATA polling on I/O7 (complement-on-bus-read during programming) and Toggle bit polling on I/O6 (state toggling until completion). Both operate within standard read cycle timing and require no additional interrupt lines or external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8-bit words) - supports full firmware parameter tables or multi-channel sensor calibration storage. |
| Access time | 150 ns - enables direct interfacing with legacy 8-bit microcontrollers (e.g., 8051, Z80) operating at ≤6 MHz without wait states. |
| Write endurance | 100,000 cycles per byte - guarantees field-updatable configuration storage over 10+ years of daily reprogramming. |
| Data retention | 100 years at +25°C - ensures long-term integrity of factory-programmed calibration constants and security keys. |
| Supply voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails; no charge pump or external VPP required. |
| Operating temperature | -40°C to +85°C - qualified for industrial automation, motor drives, and outdoor metering applications. |
| Page write size | 128 bytes - reduces total rewrite time for full memory to <0.8 s, accelerating field firmware patching. |
| Standby current | 500 µA (CMOS inputs) - minimizes power draw in battery-backed systems during sleep mode. |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, dimensions 12.57 mm × 15.11 mm (N32.45x55).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selects one of 32,768 bytes; A7–A14 define page boundaries for 128-byte writes. |
| I/O0–I/O7 | Bidirectional data bus | Tri-state I/O pins carry data during reads and accept input during writes; I/O6/I/O7 host status polling functions. |
| CE | Chip Enable | Active-low primary device select; when HIGH, forces high-impedance output and reduces ICC to 500 µA standby. |
| OE | Output Enable | Active-low read control; used with CE to gate output buffers and prevent bus contention in multi-device systems. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; initiates byte or page write upon rising edge. |
| VCC | Power supply | +5 V supply pin; requires local 0.1 µF ceramic decoupling per device to suppress transient spikes during CE activation. |
| VSS | Ground | Reference ground for all logic and memory array operations; must be low-inductance connection in high-density arrays. |
| NC (Pins 1, 12, 17, 26) | No connect | Unbonded terminals; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell technology | Eliminates pre-erase requirement and over-erase risk, enabling true random byte modification without block management overhead. |
| 128-byte page write | Reduces average write latency by >95% vs. sequential byte writes - critical for real-time logging and OTA updates. |
| DATA polling (I/O7) | Allows host CPU to poll completion via simple bit-test loop, removing need for fixed delay timers or external interrupt signals. |
| Toggle bit polling (I/O6) | Enables write-status monitoring without saving last-written address/data - simplifies multi-device array firmware design. |
| JEDEC software data protection | Nonvolatile lock activated via 3-byte sequence; prevents accidental writes during power ramp-up/down without external hardware. |
| Two-line control architecture | CE/OE separation allows deselected devices to enter standby while selected device performs read/write - essential for shared-bus memory expansion. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
Use Scenario: Storing user-defined I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed during boot and runtime via parallel bus interface. Use Value: Guarantees parameter persistence across 100,000+ power cycles and 100-year shelf life, eliminating recalibration after extended downtime. |
Use Scenario: Holding factory-trimmed sensor offsets, gain coefficients, and safety-critical operational limits in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant calibration vault with software protection enabled at manufacturing. Use Value: Meets IEC 62304 Class C requirements for data integrity; eliminates need for battery-backed SRAM or external security ICs. |
| Automotive Body Control Module Settings | Telecom Base Station Bootloader Parameters |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door-lock behavior in 12V automotive BCMs operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced directly to 8-bit MCU with no level-shifting or voltage regulation. Use Value: Qualified for extended temperature range and immune to load-dump transients due to robust 5V-only architecture. |
Use Scenario: Storing bootloader version, FPGA bitstream checksums, and RF calibration tables in carrier-grade base station radios. IC Role / Device Role / Timing Role: High-reliability configuration store accessed during cold boot and field firmware upgrades. Use Value: 128-byte page write enables sub-second reprogramming of critical boot parameters without service interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-15PU | 28-pin PDIP, 150 ns access, same 256 kbit × 8 organization but rated only to +70°C commercial temp range. | Lacks industrial temperature qualification and page-write optimization; no Toggle bit polling support. | Select for cost-sensitive, non-industrial designs where ambient temperature remains below 70°C and write throughput is secondary. |
| M95256-DW DW | 256 kbit SPI serial EEPROM, 10 MHz interface, 5 ms typical byte write, SO8 package; requires serial protocol stack. | Serial interface reduces pin count but increases MCU overhead; no parallel bus compatibility or page-write burst capability. | Choose when board space is constrained and system already uses SPI peripherals; not suitable for direct 8051/Z80 bus replacement. |
Compared with AT28C256-15PU and M95256-DW DW, the X28HC256JIZ-15 uniquely combines industrial temperature rating, parallel bus compatibility, 128-byte page write acceleration, and dual polling modes - making it optimal for legacy controller upgrades and high-throughput configuration storage where deterministic timing and minimal firmware changes are required.
Availability
X28HC256JIZ-15 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, and telecom base station firmware storage requiring stable component supply across extended lifecycle programs.
Supply support for X28HC256JIZ-15 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 precision analog and power management ICs, delivering high-reliability solutions for industrial, infrastructure, and high-end consumer markets.
The X28HC256 product line was engineered for robust, 5V-only nonvolatile storage in mission-critical embedded systems - emphasizing endurance, data retention, and ease of integration into parallel-bus architectures without external high-voltage circuitry.
FAQ
What is the maximum write speed achievable with X28HC256JIZ-15?
The X28HC256JIZ-15 supports a 128-byte page write operation, enabling the entire 256 kbit memory to be rewritten in typically less than 0.8 seconds. Individual byte writes complete in ≤5 ms, and early detection via DATA or Toggle bit polling allows the host to resume processing without fixed delays. The X28HC256JIZ-15 does not require external timing circuits or complex algorithms to achieve this performance.
Does X28HC256JIZ-15 require external high-voltage circuitry for programming?
No, the X28HC256JIZ-15 operates with a single 5V supply and requires no external high-voltage (VPP) circuitry, charge pumps, or VP-P control logic. Its Direct Write™ floating-gate technology enables full byte-alterable functionality using only standard TTL/CMOS-compatible signals - a key differentiator from earlier EEPROM generations. This simplifies design and reduces BOM cost.
How does software data protection work on X28HC256JIZ-15?
X28HC256JIZ-15 implements JEDEC-standard software data protection: a nonvolatile lock activated by writing specific values (0xAA, 0x55, 0xA0) to designated addresses. Once enabled, all subsequent writes require repeating the sequence. The X28HC256JIZ-15 ships unprotected, and protection persists across power cycles - safeguarding calibration data and firmware settings against inadvertent corruption.
Can X28HC256JIZ-15 be used in place of older 27C256 EPROMs?
Yes, the X28HC256JIZ-15 is pin-compatible with 27C256 EPROMs in 32-lead PLCC packages and shares identical address/data bus layout (A0–A14, I/O0–I/O7, CE/OE/WE). However, unlike UV-erasable EPROMs, the X28HC256JIZ-15 supports in-system byte alteration without erasure - enabling field updates and eliminating EPROM programmers and UV erasers.
What is the significance of the "JIZ" suffix in X28HC256JIZ-15?
The "JIZ" suffix in X28HC256JIZ-15 denotes: J = PLCC package, I = industrial temperature range (-40°C to +85°C), Z = RoHS-compliant construction. This distinguishes it from commercial-grade variants (e.g., X28HC256JZ-15, 0°C to +70°C) and non-RoHS versions. The X28HC256JIZ-15 is specifically qualified for harsh-environment applications requiring both thermal robustness and environmental compliance.
X28HC256JIZ-15 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 150 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)
X28HC256JIZ-15 FAQ
1.How can I place an order for X28HC256JIZ-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JIZ-15 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 X28HC256JIZ-15 reliable?
The price and inventory of X28HC256JIZ-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JIZ-15 is usually 5 days.
3.What payment methods are accepted for X28HC256JIZ-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JIZ-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JIZ-15?
X28HC256JIZ-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JIZ-15 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 X28HC256JIZ-15?
For technical support, including X28HC256JIZ-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JIZ-15 requirements.
6.How does Aetrix verify that X28HC256JIZ-15 is sourced from the original manufacturer or authorized distributors?
All X28HC256JIZ-15 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 X28HC256JIZ-15 meets industry standards.
7.What is the process for return or replacement of X28HC256JIZ-15?
All X28HC256JIZ-15 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JIZ-15, 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 X28HC256JIZ-15 part is unused and in its original packaging.
Return procedure for X28HC256JIZ-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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