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Renesas X28HC256JI-90T1R5699
- Part No.:
- X28HC256JI-90T1R5699
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JI-90T1R5699.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,657
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Product details
Overview
X28HC256JI-90T1R5699 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 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.
For engineers reviewing the X28HC256JI-90T1R5699 datasheet, X28HC256JI-90T1R5699 pinout, X28HC256JI-90T1R5699 application, or X28HC256JI-90T1R5699 equivalent, key selection considerations include industrial-grade reliability (100,000 write cycles, 100-year data retention), single 5V supply operation, no external high-voltage programming, and compatibility with legacy 8-bit microcontroller buses requiring fast nonvolatile storage with hardware/software write protection.
Technical Context
The X28HC256JI-90T1R5699 implements a two-line control architecture (CE/OE/WE) enabling bus contention-free read/write operations in multi-device memory arrays. Its Direct Write™ floating-gate cell technology eliminates erase-before-write and overerase issues while supporting self-timed internal programming.
It supports both CE-controlled and WE-controlled write cycles, with address latching on the later falling edge and data latching on the earlier rising edge of CE or WE. Page write mode requires stable A7–A14 during consecutive byte loads within ≤100 µs intervals before automatic programming initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8 bits) - supports full 15-bit addressing (A0–A14) for direct byte-level access without bank switching. |
| Access time | 90 ns - enables interoperability with 10 MHz microcontrollers and legacy 8-bit systems requiring tight timing margins. |
| Write endurance | 100,000 cycles per byte - guarantees long-term field reliability in firmware parameter storage and calibration data logging. |
| Data retention | 100 years at +25°C - ensures data integrity across product lifecycles without refresh or backup power. |
| Supply voltage | 5 V ±10% - operates directly from standard logic rails; no charge pump or external voltage translation required. |
| Operating temperature | -40°C to +85°C - qualified for industrial environments including factory automation, motor drives, and outdoor instrumentation. |
| Page write size | 128 bytes - reduces system-level write overhead by up to 128× versus byte-by-byte writes, enabling sub-second firmware updates. |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, JEDEC MS-016AE (N32.45x55), body size 12.5 mm × 15.1 mm × 3.55 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit parallel address bus; selects one of 32,768 byte locations during read/write operations. |
| I/O0–I/O7 | Bi-directional data bus | 8-bit multiplexed data path for read output and write input; high-impedance when CE or OE is HIGH. |
| CE | Chip Enable | Active-low device select; disables I/O drivers and reduces standby current to 500 µA when HIGH. |
| OE | Output Enable | Active-low read control; enables output buffers only when CE is also LOW, preventing bus contention. |
| WE | Write Enable | Active-low write control; latches address/data with CE to initiate byte or page write; supports status polling via I/O6/I/O7. |
| VCC | Power supply | +5 V supply pin; requires local 0.1 µF ceramic decoupling per device to suppress transient current spikes. |
| VSS | Ground | Reference ground for all logic and memory array operations; must be low-inductance connection. |
| NC (Pins 1, 12, 17, 26) | No Connect | Unbonded pins; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell architecture | Eliminates pre-erase requirement and overerase failure modes, enabling true byte-alterable writes without block management overhead. |
| 128-byte page write | Reduces average write latency by >99% vs. sequential byte writes-full 256 kbit rewrite completes in ≤0.8 s under typical conditions. |
| DATA polling (I/O7) | Allows host CPU to poll completion status using a single bit test instead of fixed delays or external interrupts, optimizing real-time response. |
| Toggle bit polling (I/O6) | Enables write status monitoring without saving last address/data-critical for multi-device arrays where address tracking adds complexity. |
| JEDEC software data protection | Nonvolatile lock activated via 3-byte sequence (AAh/55h/A0h); prevents inadvertent writes during power-up/down without external circuitry. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing user-configurable I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing deterministic 90 ns read access and guaranteed 100,000-cycle endurance for field updates. Use Value: Eliminates battery-backed SRAM and reduces BOM cost while maintaining data integrity across 10+ year deployments without maintenance. |
Use Scenario: Retaining sensor calibration coefficients, patient history flags, and regulatory audit logs in portable diagnostic equipment operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Trusted parameter store with 100-year data retention and -40°C to +85°C operation ensuring compliance with IEC 62304 safety requirements. Use Value: Avoids recalibration drift and satisfies FDA traceability mandates through immutable, tamper-resistant storage without external supervision. |
| Automotive Body Control Module | Legacy Industrial HMI Firmware |
Use Scenario: Holding seat/mirror position presets, lighting profiles, and CAN node configuration in automotive body control units exposed to thermal cycling and EMI. IC Role / Device Role / Timing Role: Radiation-tolerant EEPROM interfacing directly with 8-bit MCUs via standard parallel bus; immune to power glitches during ignition transients. Use Value: Replaces costly FRAM while delivering equivalent write robustness and eliminating need for complex voltage-monitoring circuits. |
Use Scenario: Hosting boot code patches, display font assets, and language localization tables in aging human-machine interface terminals with 8051 or Z80-based controllers. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete EPROMs/UV-erasable EEPROMs; supports in-system reprogramming via existing parallel programming interfaces. Use Value: Extends service life of legacy equipment by enabling field firmware updates without hardware redesign or socket replacement. |
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; 100,000 cycles; same 32k×8 organization. | Slower timing limits use in high-speed 10 MHz+ systems; through-hole PDIP suits prototyping but not high-density SMT layouts. | Select when board space allows DIP footprint and timing budget permits ≥150 ns access. |
| M95256-DW | Serial SPI interface; 5 MHz max clock; 8-pin SO8; 5V tolerant; 400 kHz I²C-compatible mode available. | Requires serial protocol stack and GPIO bit-banging support; incompatible with parallel bus architectures. | Select for new designs prioritizing pin count reduction and simplified routing over legacy bus compatibility. |
Compared with AT28C256-15PU and M95256-DW, the X28HC256JI-90T1R5699 delivers the fastest parallel access (90 ns), industrial temperature grade, and PLCC packaging optimized for automated assembly-making it the preferred choice for upgrading legacy 8-bit systems where timing, reliability, and drop-in replaceability are critical.
Availability
X28HC256JI-90T1R5699 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, and legacy HMI firmware storage requiring stable component supply across extended production lifecycles.
Supply support for X28HC256JI-90T1R5699 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 components for mission-critical infrastructure and embedded systems.
The X28HC256JI-90T1R5699 belongs to Intersil's second-generation CMOS EEPROM product line, engineered specifically for robust, low-maintenance data storage in electrically noisy, thermally demanding environments where long-term data integrity is non-negotiable.
FAQ
What is the maximum write speed achievable with X28HC256JI-90T1R5699?
The X28HC256JI-90T1R5699 supports 128-byte page writes completing in ≤0.8 seconds under typical conditions, translating to an effective write throughput of ~320 kbit/s. Individual byte writes require ≤5 ms per byte, but DATA polling or Toggle bit polling can reduce average latency by eliminating fixed wait states. The 90 ns access time applies only to read operations-not write cycles.
Does X28HC256JI-90T1R5699 require external high-voltage programming circuitry?
No, the X28HC256JI-90T1R5699 operates from a single 5 V ±10% supply and uses internal charge pumps for programming-no external VPP, VP-P, or high-voltage generators are needed. This simplifies PCB design and eliminates risks associated with external HV routing, making it compatible with standard 5 V logic families without level-shifting.
How does software data protection work on X28HC256JI-90T1R5699?
Software data protection on the X28HC256JI-90T1R5699 is enabled by writing three specific values (0xAA, 0x55, 0xA0) to addresses 0x5555, 0x2AAA, and 0x5555 respectively. Once set, the device remains write-protected across power cycles until the six-step reset sequence is executed. Protection is nonvolatile and persists for the device's lifetime unless explicitly cleared.
Can X28HC256JI-90T1R5699 be used in place of older X28C256 devices?
Yes, the X28HC256JI-90T1R5699 is a functional and pin-compatible upgrade to the first-generation X28C256, offering identical 32k×8 organization, PLCC-32 footprint, and parallel interface timing-but with enhanced 100,000-cycle endurance (vs. 10,000), 100-year data retention, and improved software protection. No PCB changes are required for drop-in replacement.
What are the decoupling capacitor requirements for X28HC256JI-90T1R5699?
Each X28HC256JI-90T1R5699 requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and VSS, placed as close as possible to the pins. For arrays of eight or more devices sharing a common bus, add a 4.7 µF electrolytic bulk capacitor per group to suppress voltage droop caused by simultaneous CE transitions and I/O switching transients.
X28HC256JI-90T1R5699 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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-90T1R5699 FAQ
1.How can I place an order for X28HC256JI-90T1R5699 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JI-90T1R5699 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-90T1R5699 reliable?
The price and inventory of X28HC256JI-90T1R5699 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JI-90T1R5699 is usually 5 days.
3.What payment methods are accepted for X28HC256JI-90T1R5699?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JI-90T1R5699 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JI-90T1R5699?
X28HC256JI-90T1R5699 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JI-90T1R5699 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-90T1R5699?
For technical support, including X28HC256JI-90T1R5699 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JI-90T1R5699 requirements.
6.How does Aetrix verify that X28HC256JI-90T1R5699 is sourced from the original manufacturer or authorized distributors?
All X28HC256JI-90T1R5699 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-90T1R5699 meets industry standards.
7.What is the process for return or replacement of X28HC256JI-90T1R5699?
All X28HC256JI-90T1R5699 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JI-90T1R5699, 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-90T1R5699 part is unused and in its original packaging.
Return procedure for X28HC256JI-90T1R5699:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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