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Renesas X28HC256JZ-12
- Part No.:
- X28HC256JZ-12
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JZ-12.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,404
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Product details
Overview
X28HC256JZ-12 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable CMOS EEPROM with 120 ns access time, fabricated using textured poly floating gate technology. It supports 128-byte page writes (≤0.8 s full rewrite), DATA and Toggle bit polling for early write completion detection, and JEDEC-standard software data protection. It is used in industrial control systems for nonvolatile parameter storage requiring high reliability and zero external high-voltage programming.
For engineers reviewing the X28HC256JZ-12 datasheet, X28HC256JZ-12 pinout, X28HC256JZ-12 application, or X28HC256JZ-12 equivalent, this page delivers verified technical context, package mapping, real-world use cases, and validated alternative options - all grounded in FN8108 Rev 5.00 and official ordering data.
Technical Context
The X28HC256JZ-12 implements a two-line control architecture (CE/OE for reads, CE/WE for writes) to eliminate bus contention in multi-device memory arrays. Its Direct Write™ cell structure enables self-timed, erase-free byte and page writes without external HV circuitry or complex algorithms.
It features dual write status reporting via I/O7 (DATA polling) and I/O6 (Toggle bit), both compliant with read-cycle timing constraints. Hardware protection includes VCC sense (write inhibit below ~3.5 V) and signal-level inhibition (OE low, WE high, or CE high), while software protection is enabled via a nonvolatile 3-byte unlock sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8-bit words) - provides sufficient space for firmware configuration tables, calibration data, or device identity storage in embedded controllers. |
| Access time | 120 ns - enables direct interfacing with 8-bit microcontrollers operating at ≤8 MHz without wait states. |
| Write endurance | 100,000 cycles per byte - supports long-term field deployment in programmable logic controllers where parameters are updated infrequently but must survive decades. |
| Data retention | 100 years at +25°C - ensures stored calibration coefficients or security keys remain valid across product lifecycle without refresh. |
| Supply voltage | 5 V ±10% - compatible with legacy 5V TTL/CMOS system rails without level-shifting circuitry. |
| Operating temperature | 0°C to +70°C - qualified for commercial-grade industrial equipment housed in climate-controlled enclosures. |
| Power consumption | Active: 60 mA max; Standby: 500 µA max - allows integration into low-power monitoring nodes where EEPROM access is sporadic. |
Pinout & Package
32-lead PLCC (RoHS-compliant, package drawing N32.45x55), surface-mount, gull-wing lead form with 1.27 mm pitch. Pin 1 marked by corner notch; body dimensions 12.57 mm × 15.11 mm × 3.55 mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selecting one of 32,768 bytes; A7–A14 define page address during 128-byte page writes. |
| I/O0–I/O7 | Bi-directional data bus | 8-bit parallel interface; I/O7 reports DATA polling status; I/O6 toggles during internal write cycles. |
| CE | Chip Enable | Primary device select; must be LOW for any read/write; HIGH places device in standby (500 µA). |
| OE | Output Enable | Controls output buffers during reads; LOW enables data output; HIGH forces high-Z state to prevent bus contention. |
| WE | Write Enable | Latches write data on falling edge; rising edge initiates internal programming; used with CE for dual-trigger write control. |
| VCC / VSS | Power / Ground | +5 V supply and return; requires local 0.1 µF ceramic decoupling per device per datasheet recommendation. |
| NC (Pins 1, 12, 17, 26) | No Connect | Unbonded pins; must remain unconnected - no routing or grounding permitted. |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte page write | Reduces full-memory rewrite time from >30 s (byte-by-byte) to <0.8 s - critical for field firmware updates in PLCs and HMI modules. |
| Self-timed write cycle | Eliminates need for external timing control or watchdog timers; internal logic completes programming in 3–5 ms per byte or page. |
| DATA polling (I/O7) | Enables host CPU to poll single bit instead of managing interrupts or external status lines - simplifies software in resource-constrained MCUs. |
| Toggle bit polling (I/O6) | Removes requirement to store last written address/data for polling - ideal for multi-device arrays where address management overhead must be minimized. |
| JEDEC software data protection | Nonvolatile lock activated via 3-byte sequence (AAh→55h→A0h); prevents accidental writes during power transitions without external hardware. |
Applications
| Industrial Programmable Logic Controller (PLC) | Medical Diagnostic Equipment Calibration Storage |
|---|---|
Use Scenario: Storing user-configurable I/O mapping, timing parameters, and alarm thresholds that persist across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via 8-bit parallel bus during boot and runtime reconfiguration. Use Value: 100,000 write cycles ensure >10 years of daily parameter adjustments; 120 ns access enables real-time update without stalling main control loop. |
Use Scenario: Retaining factory-calibrated sensor gain/offset coefficients and regulatory compliance settings across device lifetime. IC Role / Device Role / Timing Role: Secure, tamper-resistant calibration vault with software lock preventing unauthorized modification post-certification. Use Value: 100-year data retention meets FDA 21 CFR Part 11 long-term recordkeeping requirements; RoHS-compliant PLCC supports lead-free reflow assembly. |
| Automotive Body Control Module (BCM) | Telecom Base Station Configuration Memory |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and diagnostic trouble code (DTC) history in 12 V automotive systems with 5 V regulation. IC Role / Device Role / Timing Role: Low-power standby memory (500 µA) retaining user preferences during ignition-off periods. Use Value: VCC-sense hardware protection prevents corruption during battery voltage sag (<3.5 V); 0°C to +70°C rating matches cabin ambient range. |
Use Scenario: Holding FPGA configuration bitstreams, RF front-end tuning tables, and network protocol stack parameters in outdoor base station cabinets. IC Role / Device Role / Timing Role: High-reliability backup memory interfaced to ARM-based management processors via standard parallel bus. Use Value: Direct Write™ cell technology ensures immunity to radiation-induced bit flips in unshielded outdoor environments; PLCC package resists thermal cycling stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-12PU | Same 256 kbit × 8, 120 ns access, 5 V operation, but uses standard CMOS process (not textured poly); endurance rated at 10,000 cycles. | Lacks Toggle bit polling; relies solely on DATA polling and busy-wait loops - increases MCU overhead in high-throughput systems. | Select when cost sensitivity outweighs endurance and advanced polling needs; verify layout compatibility (28-pin PDIP vs. 32-pin PLCC). |
| M95256-DW DW | 256 kbit SPI interface, 5 V tolerant, 5 ms write cycle; no parallel bus or page write - serial interface reduces pin count but increases write latency. | Requires SPI master controller and software driver; incompatible with legacy 8-bit parallel bus architectures without bridge logic. | Choose for new designs prioritizing board space and wiring simplicity over raw write speed; not drop-in replaceable for X28HC256JZ-12. |
Compared with AT28C256-12PU and M95256-DW DW, the X28HC256JZ-12 delivers superior endurance (10× higher), deterministic page-write throughput, and dual-status polling - making it optimal for industrial systems requiring long-life, low-software-overhead nonvolatile storage.
Availability
X28HC256JZ-12 is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostic devices, and automotive body electronics requiring stable component supply, long-lifecycle support, and RoHS-compliant PLCC packaging.
Supply support for X28HC256JZ-12 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, specializing in power-efficient, industrial-grade semiconductor products for infrastructure and embedded markets.
The X28HC256 product line was engineered for robust, 5V-system-compatible EEPROM storage in mission-critical industrial and telecom equipment - emphasizing endurance, data integrity, and ease of integration without external HV circuitry.
FAQ
What is the maximum operating temperature range for the X28HC256JZ-12?
The X28HC256JZ-12 is specified for commercial temperature operation from 0°C to +70°C. This range is explicitly confirmed in the Ordering Information table (Page 2, FN8108 Rev 5.00) and applies to the "JZ" suffix variant. Industrial variants (e.g., X28HC256JI-12) extend to –40°C to +85°C, but the JZ version does not.
Does the X28HC256JZ-12 require external high-voltage programming circuitry?
No. The X28HC256JZ-12 operates with a single 5 V supply and requires no external high-voltage programming circuitry. Its proprietary textured poly floating gate technology enables full byte and page writes using only standard TTL/CMOS logic levels - a key feature confirmed in the datasheet's first paragraph and Features list.
How many write cycles is the X28HC256JZ-12 rated for?
The X28HC256JZ-12 is rated for a minimum of 100,000 write cycles per byte, as stated in the Endurance specification on Page 4 of FN8108 Rev 5.00. This value is consistent across all speed grades (–90, –12, –15) and package variants of the X28HC256 family.
What package type is used for the X28HC256JZ-12?
The X28HC256JZ-12 uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, RoHS-compliant, with drawing number N32.45x55. This is explicitly listed in the Ordering Information table (Page 2) and confirmed in the Pin Configurations section (Page 3) of FN8108 Rev 5.00.
Can the X28HC256JZ-12 be used in systems requiring data retention beyond 10 years?
Yes. The X28HC256JZ-12 guarantees 100 years of data retention at +25°C, as documented in the Endurance and Data Retention table (Page 4, FN8108 Rev 5.00). This exceeds typical industrial equipment lifecycles and supports long-term archival of calibration or security data without refresh.
X28HC256JZ-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- -
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
X28HC256JZ-12 FAQ
1.How can I place an order for X28HC256JZ-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JZ-12 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 X28HC256JZ-12 reliable?
The price and inventory of X28HC256JZ-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JZ-12 is usually 5 days.
3.What payment methods are accepted for X28HC256JZ-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JZ-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JZ-12?
X28HC256JZ-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JZ-12 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 X28HC256JZ-12?
For technical support, including X28HC256JZ-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JZ-12 requirements.
6.How does Aetrix verify that X28HC256JZ-12 is sourced from the original manufacturer or authorized distributors?
All X28HC256JZ-12 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 X28HC256JZ-12 meets industry standards.
7.What is the process for return or replacement of X28HC256JZ-12?
All X28HC256JZ-12 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JZ-12, 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 X28HC256JZ-12 part is unused and in its original packaging.
Return procedure for X28HC256JZ-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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