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Renesas X28HC256JIZ-90T1
- Part No.:
- X28HC256JIZ-90T1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JIZ-90T1.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,820
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Product details
Overview
X28HC256JIZ-90T1 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable CMOS EEPROM with 90 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 power-up/down write inhibition.
For engineers reviewing the X28HC256JIZ-90T1 datasheet, X28HC256JIZ-90T1 pinout, X28HC256JIZ-90T1 application, or X28HC256JIZ-90T1 equivalent, key selection criteria include industrial temperature range (-40°C to +85°C), RoHS-compliant 32-lead PLCC package, 100,000 write endurance, 100-year data retention, and compatibility with 5V TTL/CMOS bus interfaces in legacy embedded systems.
Technical Context
The X28HC256JIZ-90T1 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 single 5V supply operation with no external high-voltage programming circuitry or pre-erase requirement.
It features dual write status reporting via I/O7 (DATA polling) and I/O6 (Toggle bit), both compliant with read cycle timing constraints. The device integrates hardware VCC-sense write inhibit (<3.5 V) and software-controlled nonvolatile protection activated via a three-byte address sequence (5555h/2AAAh/5555h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8 bits); supports byte- and page-level writes without erase cycles. |
| Access time | 90 ns; ensures compatibility with 10 MHz system buses and fast microcontroller read cycles. |
| Operating voltage | 5 V ±10%; operates from single 5V rail-no charge pump or external VPP required. |
| Endurance | 100,000 write cycles per byte; validated for long-term field deployment in configuration storage. |
| Data retention | 100 years at +25°C; guaranteed minimum retention under industrial temperature stress. |
| Supply current | 60 mA active / 500 µA standby; low-power design suitable for battery-backed or energy-constrained systems. |
| Temperature range | -40°C to +85°C; qualified for industrial-grade operation in harsh environments. |
| Package | 32-lead PLCC (RoHS-compliant, N32.45x55); surface-mount compatible with standard reflow profiles. |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, body size 12.57 mm × 15.11 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 address during 128-byte writes. |
| I/O0–I/O7 | Bidirectional data bus | 8-bit parallel interface; carries write data or read output; supports status polling on I/O6/I/O7. |
| CE | Chip Enable | Active-low primary device select; must be LOW to enable read/write; places device in standby when HIGH. |
| OE | Output Enable | Active-low read control; enables output buffers only during CE LOW; prevents bus contention. |
| WE | Write Enable | Active-low write control; latches data on rising edge; initiates byte or page write with CE LOW. |
| VCC | Power supply | +5 V supply input; decoupling requires 0.1 µF ceramic capacitor per device. |
| VSS | Ground | Reference ground for all signals and power; common return path for I/O and internal logic. |
| NC | No Connect | Pins 1, 12, 17, 26 are unconnected; must remain floating-no external connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte page write | Reduces full-memory rewrite time to ≤0.8 s versus >30 s for sequential byte writes; improves firmware update efficiency. |
| DATA polling (I/O7) | Enables host CPU to detect write completion via simple bit-test loop-no interrupt line or external timer needed. |
| Toggle bit polling (I/O6) | Eliminates need to store last written address/data; allows concurrent memory access during write verification. |
| Software data protection | Nonvolatile lock activated by 3-byte sequence; prevents accidental writes during power transitions without external hardware. |
| Direct Write™ cell | Textured poly floating gate technology ensures 100,000-cycle endurance and 100-year retention without wear leveling. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
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; retains settings across power cycles and withstands 10+ annual firmware updates. Use Value: Eliminates backup battery dependency; 100-year retention ensures calibration integrity over equipment lifetime. | Use Scenario: Holding sensor offset/gain coefficients and patient-specific therapy profiles in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure parameter vault; accessed during boot and runtime recalibration; protected by software lock against EMI-induced corruption. Use Value: Meets IEC 62304 Class C software safety requirements via deterministic write status reporting and power-fail write inhibition. |
| Telecom Base Station Bootloader Settings | Automotive Body Control Module NV Memory |
Use Scenario: Preserving MAC addresses, RF channel plans, and fail-safe boot configurations in outdoor wireless infrastructure units. IC Role / Device Role / Timing Role: Critical startup parameter store; accessed within 100 µs of power-on (tPUR = 100 µs); survives -40°C cold starts. Use Value: 90 ns access time enables immediate bootloader execution; industrial temp rating avoids derating in sealed enclosures. | Use Scenario: Recording door lock states, mirror position memories, and lighting presets in vehicle body control units exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Endurance-critical NV storage; endures 100,000+ seat/mirror adjustment cycles over 15-year service life. Use Value: 100,000 write cycles exceed automotive OEM requirements (typically 50,000); RoHS PLCC simplifies legacy PCB rework. |
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; 5V only; 100K endurance; same 32k×8 organization. | Slower timing limits use in high-speed microcontroller interfaces; through-hole package restricts SMT production. | Select when cost-sensitive, through-hole assembly is required, and 150 ns access suffices. |
| MX28LV256APCI-12 | 120 ns access; SOIC-28; 3.3V/5V tolerant; 100K endurance; software protection supported. | Wider voltage range enables mixed-voltage designs; smaller SOIC footprint saves board space. | Select for new designs needing 3.3V compatibility or space-constrained layouts; verify VCC sense threshold matches system ramp rate. |
Compared with AT28C256-15PU and MX28LV256APCI-12, the X28HC256JIZ-90T1 delivers the fastest access (90 ns) in a RoHS-compliant PLCC package with proven industrial temperature reliability-ideal for upgrading legacy 5V systems where timing margin and mounting compatibility are critical.
Availability
X28HC256JIZ-90T1 is available at Aetrix Electronics and suitable for industrial PLCs, medical calibration storage, telecom base station configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for X28HC256JIZ-90T1 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 X28HC256JIZ-90T1 belongs to Intersil's second-generation CMOS EEPROM product line, designed specifically for robust, single-supply nonvolatile storage in mission-critical industrial and telecom applications where data integrity across power cycles is essential.
FAQ
What is the maximum operating temperature range for the X28HC256JIZ-90T1?
The X28HC256JIZ-90T1 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 and 100,000 write endurance. The device maintains full functionality-including DATA polling and software protection-across this entire span, making it suitable for under-hood automotive and outdoor telecom deployments where thermal stability is critical. X28HC256JIZ-90T1 performance does not require derating at temperature extremes.
Does the X28HC256JIZ-90T1 require external high-voltage programming circuitry?
No, the X28HC256JIZ-90T1 operates from a single 5V supply with no external high-voltage circuitry required. Its Direct Write™ cell technology eliminates the need for VPP pins, charge pumps, or complex programming algorithms. All write operations-including byte, page, and software protection activation-are self-timed and completed internally within the specified tWC (5 ms typical). This simplifies system design, reduces BOM count, and enhances reliability compared to older EEPROM architectures. X28HC256JIZ-90T1 fully complies with JEDEC standards for 5V-only operation.
How does the software data protection feature work on the X28HC256JIZ-90T1?
The X28HC256JIZ-90T1 software data protection is a nonvolatile lock activated by writing three specific values (0xAA, 0x55, 0xAA) to addresses 0x5555, 0x2AAA, and 0x5555 in sequence. Once enabled, all subsequent writes require repeating this sequence before loading data. Protection persists through power cycles and remains active until explicitly reset via a six-step unlock algorithm. The feature is shipped disabled, allowing immediate use. X28HC256JIZ-90T1 implements this per JEDEC standard, ensuring interoperability with existing EEPROM firmware routines.
Can the X28HC256JIZ-90T1 be used in place of the X28HC256JI-90?
Yes-the X28HC256JIZ-90T1 is the tape-and-reel version of the X28HC256JI-90, with identical electrical, timing, and functional specifications. The "Z" suffix denotes RoHS compliance, and "T1" indicates 1,000-unit tape-and-reel packaging per JEDEC standard TB347. Pinout, access time (90 ns), temperature range (-40°C to +85°C), and all DC/AC parameters match exactly. X28HC256JIZ-90T1 is a direct replacement for automated SMT assembly, while X28HC256JI-90 is supplied in tube packaging for prototyping or low-volume hand-soldering.
What is the purpose of the NC pins on the X28HC256JIZ-90T1 PLCC package?
The X28HC256JIZ-90T1 has four NC (No Connect) pins: 1, 12, 17, and 26. These pins are electrically isolated from the die and serve no functional role-neither signal nor power. They must remain unconnected and floating; soldering them to ground, VCC, or any trace violates the device's thermal and electrical specifications and may cause latch-up or parametric failure. Their presence accommodates package mold tooling and mechanical alignment in the 32-lead PLCC (N32.45x55) footprint. X28HC256JIZ-90T1 operation is fully defined and guaranteed only when NC pins are left open.
X28HC256JIZ-90T1 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:
- 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)
X28HC256JIZ-90T1 FAQ
1.How can I place an order for X28HC256JIZ-90T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JIZ-90T1 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-90T1 reliable?
The price and inventory of X28HC256JIZ-90T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JIZ-90T1 is usually 5 days.
3.What payment methods are accepted for X28HC256JIZ-90T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JIZ-90T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JIZ-90T1?
X28HC256JIZ-90T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JIZ-90T1 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-90T1?
For technical support, including X28HC256JIZ-90T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JIZ-90T1 requirements.
6.How does Aetrix verify that X28HC256JIZ-90T1 is sourced from the original manufacturer or authorized distributors?
All X28HC256JIZ-90T1 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-90T1 meets industry standards.
7.What is the process for return or replacement of X28HC256JIZ-90T1?
All X28HC256JIZ-90T1 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JIZ-90T1, 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-90T1 part is unused and in its original packaging.
Return procedure for X28HC256JIZ-90T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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