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Renesas X28HC256JIZ-12T1
- Part No.:
- X28HC256JIZ-12T1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JIZ-12T1.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,293
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Product details
Overview
X28HC256JIZ-12T1 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable CMOS EEPROM with 120 ns access time, -40°C to +85°C industrial temperature range, and 32-lead PLCC RoHS-compliant package. It features 128-byte page write capability (≤0.8 s full rewrite), DATA polling and Toggle bit polling for early write completion detection, and JEDEC-standard software data protection - deployed in embedded control systems requiring nonvolatile parameter storage with high reliability.
For engineers reviewing the X28HC256JIZ-12T1 datasheet, X28HC256JIZ-12T1 pinout, X28HC256JIZ-12T1 application, or X28HC256JIZ-12T1 equivalent, key selection considerations include industrial-grade temperature support, 5V single-supply operation without external high-voltage programming, self-timed write cycles, and compatibility with legacy parallel memory bus architectures using CE/OE/WE control.
Technical Context
The X28HC256JIZ-12T1 implements a two-line control architecture (CE and OE) to eliminate bus contention in multi-device memory arrays, with address latching triggered by the later of CE or WE falling edges. Its Direct Write™ floating-gate cell technology enables true byte-level alterability without prior erase, supporting both CE-controlled and WE-controlled write cycles.
It integrates hardware-based VCC sense (write inhibit below ~3.5 V) and software data protection activated via a three-byte unlock sequence to A5555H/A2AAAH/A5555H. End-of-write status is signaled through dedicated I/O7 (DATA polling) and I/O6 (Toggle bit), enabling efficient polling without interrupts or external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8-bit words) - supports firmware configuration tables, calibration data, and device identity storage in resource-constrained systems. |
| Access time | 120 ns - ensures compatibility with 8 MHz Z80, 68K, and early ARM-based microcontrollers operating on parallel buses. |
| Write endurance | 100,000 write cycles per byte - guarantees long-term field reliability for infrequently updated system parameters like network settings or sensor offsets. |
| Data retention | 100 years at +25°C - eliminates need for periodic refresh or backup power in battery-free industrial logging applications. |
| Supply voltage | 5 V ±10% - operates directly from standard TTL/CMOS logic rails without auxiliary regulators or charge pumps. |
| Operating temperature | -40°C to +85°C - qualified for deployment in industrial automation controllers, motor drives, and outdoor metering equipment. |
| Page write size | 128 bytes - reduces host CPU overhead during bulk updates (e.g., loading new calibration sets) while maintaining deterministic timing. |
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 | Selects one of 32,768 memory locations; A7–A14 define page address for 128-byte writes. |
| I/O0–I/O7 | Bidirectional data bus | Carries 8-bit data during read/write; I/O6 and I/O7 serve as status bits (Toggle/ DATA Polling) during internal programming. |
| CE | Chip Enable | Active-low primary device select; must be LOW to enable read/write; HIGH places device in low-power standby (500 µA). |
| OE | Output Enable | Active-low control for output buffers; used with CE to initiate reads; HIGH during writes to disable outputs. |
| WE | Write Enable | Active-low write strobe; falling edge latches data; rising edge triggers internal programming cycle. |
| VCC | Power supply | +5 V supply input; decoupling requires 0.1 µF ceramic capacitor per device plus 4.7 µF bulk cap per eight devices. |
| VSS | Ground | Reference return path; must be low-impedance to suppress transient spikes during CE activation. |
| NC (Pins 1, 12, 17, 26) | No connect | Unbonded pins; must remain unconnected to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed write cycle | Eliminates need for external write pulse timing control; internal logic completes programming in ≤5 ms per byte or ≤0.8 s per full array. |
| JEDEC software data protection | Three-byte unlock sequence prevents accidental writes during power-up/down and runtime - no external hardware required. |
| Direct Write™ cell architecture | Enables true byte-alterability without block erase, preserving adjacent data integrity during partial updates. |
| Early write completion signaling | DATA polling (I/O7) and Toggle bit (I/O6) allow host CPU to poll status instead of waiting fixed timeout, reducing average write latency by >50%. |
| Industrial temperature qualification | Validated operation from -40°C to +85°C ensures robustness in factory-floor PLCs, HVAC controllers, and transportation electronics. |
Applications
| Industrial Programmable Logic Controllers (PLCs) | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Storing user-configurable I/O mapping, ladder logic scan times, and alarm thresholds that persist across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank interfaced via parallel bus to 8-bit microcontroller; accessed during boot and runtime parameter adjustment. Use Value: Enables field reconfiguration without firmware update; 100,000-cycle endurance supports decades of maintenance cycles in deployed units. | Use Scenario: Retaining calibration coefficients, patient history metadata, and safety-critical operational limits in portable ultrasound or ECG monitors. IC Role / Device Role / Timing Role: Dedicated parameter storage peripheral with hardware write-inhibit during brown-out conditions to prevent corruption during battery switchover. Use Value: Guarantees data integrity under unstable power; 100-year retention meets FDA regulatory requirements for medical device lifetime traceability. |
| Automotive Engine Control Units (ECUs) | Telecom Base Station Power Management |
Use Scenario: Holding adaptive fuel trim values, diagnostic trouble code (DTC) logs, and emission calibration maps subject to occasional field updates. IC Role / Device Role / Timing Role: Parallel-connected EEPROM on CAN microcontroller bus; accessed during engine-off learning routines and service mode diagnostics. Use Value: Industrial temp rating (-40°C to +85°C) matches under-hood thermal envelope; page write minimizes flash wear in frequent calibration updates. | Use Scenario: Storing DC-DC converter setpoints, thermal derating curves, and fault recovery policies in telecom rectifier modules. IC Role / Device Role / Timing Role: Standalone nonvolatile memory on power management ASIC bus; updated only during firmware upgrades or commissioning. Use Value: 5V-only operation simplifies integration with legacy PMICs; software protection prevents inadvertent overwrite during hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-12PU | 28-pin PDIP, 120 ns access, same 256 kbit × 8 organization but lower industrial temp range (-40°C to +85°C not guaranteed; rated 0°C to +70°C) | Suitable for commercial-grade board-level replacements where ambient temperature stays below 70°C | Select when footprint constraints require DIP and thermal margin allows commercial temp grade |
| M95256-DW DW | 256 kbit SPI interface, 5V supply, 10 MHz clock, 8-pin SO8 package - serial vs. parallel interface, no CE/OE/WE control lines | Used in space-constrained designs with microcontrollers featuring SPI peripherals; incompatible with parallel bus architectures | Select when board layout favors serial interface and host MCU lacks parallel bus or has limited GPIO |
Compared with AT28C256-12PU, X28HC256JIZ-12T1 offers guaranteed industrial temperature operation and PLCC packaging for surface-mount reliability; compared with M95256-DW, it provides direct parallel bus compatibility but requires more PCB area and control signals.
Availability
X28HC256JIZ-12T1 is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive ECU applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for X28HC256JIZ-12T1 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 solutions, serving industrial, infrastructure, and high-end consumer markets with high-reliability semiconductor products.
The X28HC256 product line was designed for embedded systems requiring robust, 5V-compatible nonvolatile memory with deterministic write timing, hardware/software write protection, and industrial temperature resilience - targeting legacy and upgrade paths in control and instrumentation applications.
FAQ
What is the maximum write cycle time for X28HC256JIZ-12T1 during a single-byte write operation?
The maximum write cycle time (tWC) for X28HC256JIZ-12T1 is 5 ms per byte under typical conditions. This is the worst-case duration the device requires to complete internal programming after WE goes high. Using DATA polling or Toggle bit detection allows the host to exit the wait state earlier, reducing effective latency significantly. The X28HC256JIZ-12T1 specification confirms this value in its AC Electrical Specifications table on page 5 of FN8108 Rev 5.00.
Does X28HC256JIZ-12T1 support page write operations, and what is the page size?
Yes, X28HC256JIZ-12T1 supports 128-byte page write operations, enabling up to 128 consecutive bytes to be loaded before initiating the internal programming cycle. This reduces total rewrite time for full memory to typically less than 0.8 seconds. The page address is defined by A7–A14, and all writes within a page must maintain identical values on those address lines. This behavior is documented in the Device Operation section on page 10 of the X28HC256JIZ-12T1 datasheet.
How does software data protection work on X28HC256JIZ-12T1, and can it be disabled?
Software data protection on X28HC256JIZ-12T1 is enabled via a three-byte unlock sequence (AAH to 5555H, 55H to 2AAAH, A0H to 5555H), after which writes are permitted until the next power cycle or explicit reset. To disable it, a six-step reset sequence (55H→2AAAH, 55H→5555H, 80H→5555H, 55H→2AAAH, 20H→5555H, AAH→5555H) must be executed. Both sequences are nonvolatile and persist across power cycles. This functionality is fully specified in Figures 13 and 15 of the X28HC256JIZ-12T1 datasheet.
What are the power consumption characteristics of X28HC256JIZ-12T1 in active and standby modes?
X28HC256JIZ-12T1 draws up to 60 mA during active read/write operations (ICC) and only 500 µA in standby mode (ISB2) when CE is high and inputs are at CMOS levels. These values are measured across the recommended operating conditions (5 V ±10%, -40°C to +85°C) and reflect true low-power design for battery-backed or energy-sensitive applications. The DC Electrical Specifications table on page 4 of the X28HC256JIZ-12T1 datasheet validates these figures.
Is X28HC256JIZ-12T1 pin-compatible with other members of the X28HC256 family, such as X28HC256JI-12?
Yes, X28HC256JIZ-12T1 is pin-compatible with X28HC256JI-12 and other 32-lead PLCC variants in the X28HC256 family, sharing identical pinout, signal definitions, and package dimensions (N32.45x55). The "Z" suffix denotes RoHS compliance, and "T1" indicates tape-and-reel packaging - both are mechanical/package-level distinctions that do not affect electrical or functional compatibility. Pin compatibility is confirmed in the Pin Configurations and Pin Descriptions sections on page 3 of the X28HC256JIZ-12T1 datasheet.
X28HC256JIZ-12T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- 120 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-12T1 FAQ
1.How can I place an order for X28HC256JIZ-12T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JIZ-12T1 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-12T1 reliable?
The price and inventory of X28HC256JIZ-12T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JIZ-12T1 is usually 5 days.
3.What payment methods are accepted for X28HC256JIZ-12T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JIZ-12T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JIZ-12T1?
X28HC256JIZ-12T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JIZ-12T1 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-12T1?
For technical support, including X28HC256JIZ-12T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JIZ-12T1 requirements.
6.How does Aetrix verify that X28HC256JIZ-12T1 is sourced from the original manufacturer or authorized distributors?
All X28HC256JIZ-12T1 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-12T1 meets industry standards.
7.What is the process for return or replacement of X28HC256JIZ-12T1?
All X28HC256JIZ-12T1 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JIZ-12T1, 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-12T1 part is unused and in its original packaging.
Return procedure for X28HC256JIZ-12T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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