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Renesas X28HC256JIZ-15T1
- Part No.:
- X28HC256JIZ-15T1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JIZ-15T1.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,373
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Product details
Overview
X28HC256JIZ-15T1 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable CMOS EEPROM with 150 ns access time, industrial temperature range (–40°C to +85°C), and 32-lead PLCC RoHS-compliant package. It features 128-byte page write capability, DATA polling and Toggle bit status detection, and JEDEC-standard software data protection - used in embedded systems for configuration storage, calibration data retention, and firmware parameter backup.
For engineers reviewing the X28HC256JIZ-15T1 datasheet, X28HC256JIZ-15T1 pinout, X28HC256JIZ-15T1 application, or X28HC256JIZ-15T1 equivalent, key selection criteria include industrial-grade reliability (100,000 write cycles, 100-year data retention), 5V single-supply operation without high-voltage programming, and dual-line control architecture (CE/OE) for bus contention avoidance in multi-device memory arrays.
Technical Context
The X28HC256JIZ-15T1 implements a direct-write floating-gate EEPROM cell using textured poly technology, enabling true byte-level alterability without prior erase. Its control logic supports both CE-controlled and WE-controlled write cycles, with address latching on the later of CE or WE falling edge and data latching on the earlier of CE or WE rising edge.
It integrates early-write-detection via I/O7 (DATA polling) and I/O6 (Toggle bit), both mapped directly to the data bus and compatible with standard read timing. The device also embeds hardware VCC-sense write inhibition below ~3.5V and software-based nonvolatile protection activated via a three-byte unlock sequence to address power-up/down and accidental writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 256 kbit (32,768 × 8 bits) - supports full system configuration storage without external expansion. |
| Access time | 150 ns - enables direct interface with legacy 8-bit microcontrollers (e.g., 8051, Z80) operating at ≤6 MHz. |
| Write endurance | 100,000 cycles per byte - sufficient for field-updatable calibration tables updated daily over 27 years. |
| Data retention | 100 years at +25°C - ensures long-term integrity of stored parameters in unpowered industrial equipment. |
| Supply voltage | 5 V ±10% - operates from standard logic rail without auxiliary regulators or charge pumps. |
| Operating temperature | –40°C to +85°C - qualified for industrial control panels, motor drives, and outdoor instrumentation. |
| Page write size | 128 bytes - reduces total write time for bulk updates to <0.8 s, minimizing system downtime during reconfiguration. |
| Standby current | 500 µA (CMOS inputs) - enables low-power retention in battery-backed or energy-harvesting applications. |
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 selecting one of 32,768 bytes; A7–A14 define page boundaries for 128-byte page writes. |
| I/O0–I/O7 | Bidirectional data bus | 8-bit parallel interface; I/O7 provides DATA polling status, I/O6 provides Toggle bit status during writes. |
| CE | Chip Enable | Active-low primary device select; must be LOW for all read/write operations; controls standby current reduction. |
| OE | Output Enable | Active-low output buffer control; HIGH disables outputs to prevent bus contention in multi-device systems. |
| WE | Write Enable | Active-low write strobe; latches data on rising edge; used with CE to initiate byte or page write sequences. |
| VCC | Power supply | +5 V supply input; decoupling requires 0.1 µF ceramic capacitor per device plus 4.7 µF bulk cap per 8 devices. |
| VSS | Ground | Reference ground for all signals and internal logic; must be low-impedance connection to minimize noise coupling. |
| NC (pins 1, 12, 17, 26) | No connect | Unbonded pins; must remain unconnected per datasheet to avoid parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed 5V-only write | Eliminates need for external high-voltage generators or complex timing controllers - simplifies PCB layout and firmware. |
| 128-byte page write | Reduces average write latency by >95% vs. byte-by-byte writes, enabling fast field updates of configuration blocks. |
| DATA polling (I/O7) | Allows host CPU to poll completion status using a single bit test - no interrupt lines or external status hardware required. |
| Software data protection | Nonvolatile lock activated via 3-byte unlock sequence; prevents unintended writes during power transitions or firmware bugs. |
| Two-line control architecture | Independent CE and OE enables selective device activation in dense memory arrays - avoids bus contention and signal integrity issues. |
| Direct Write™ cell technology | Textured poly floating gate ensures stable threshold voltage over 100,000 cycles and 100-year retention without refresh. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed during boot and runtime via 8-bit parallel bus; 150 ns access supports real-time parameter reads during scan cycles. Use Value: Guarantees parameter persistence across 100,000+ power cycles and 100-year shelf life - eliminates recalibration after extended downtime or firmware upgrades. |
Use Scenario: Holding sensor offset/gain coefficients, patient-specific therapy settings, and regulatory audit logs in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter vault; software protection prevents unauthorized modification during clinical use or service mode. Use Value: Meets IEC 62304 Class B software safety requirements via deterministic write verification (DATA polling) and power-fail write inhibition. |
| Automotive ECU Bootloader Parameters | Telecom Base Station Firmware Patch Storage |
Use Scenario: Storing bootloader version, secure boot keys, and CAN message routing tables in engine control units operating under under-hood thermal stress. IC Role / Device Role / Timing Role: Industrial-temperature EEPROM interfaced to MCU's external memory bus; CE/OE control isolates it during CAN frame processing to avoid bus conflicts. Use Value: –40°C to +85°C rating ensures reliable operation at 125°C ambient (with derating); 500 µA standby current extends battery backup runtime during ignition-off periods. |
Use Scenario: Caching firmware patch binaries and rollback images in remote radio heads and small-cell base stations requiring zero-downtime updates. IC Role / Device Role / Timing Role: High-reliability update staging area; 128-byte page writes enable sub-second patch commits without disrupting active RF transmission. Use Value: 100,000 write cycles support daily patch deployments over 27 years; RoHS-compliant PLCC allows wave-solder assembly in telecom manufacturing lines. |
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 32k×8 density and 5V operation; lacks Toggle bit polling and software protection. | Lower-cost replacement where industrial temp range and advanced write-status feedback are not required. | Select when board space permits DIP footprint and system firmware handles write timing via fixed delays instead of polling. |
| ST M28W256FBD-150ZB6 | 32-pin PLCC, 150 ns, but 5V/3.3V dual-voltage capable; includes hardware write-protect pin and enhanced ESD robustness (4 kV HBM). | Preferred for new designs requiring future 3.3V migration path or higher immunity in noisy telecom infrastructure. | Choose when interoperability with mixed-voltage systems or stricter ESD compliance (IEC 61000-4-2 Level 3) is mandatory. |
Compared with AT28C256-15PU and ST M28W256FBD-150ZB6, the X28HC256JIZ-15T1 delivers unique value in deterministic write completion signaling (DATA/Toggle polling) and nonvolatile software lock - critical for safety-critical or field-upgradable systems where write failure detection and data integrity assurance are design requirements.
Availability
X28HC256JIZ-15T1 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive ECUs, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant PLCC packaging.
Supply support for X28HC256JIZ-15T1 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 leader in precision analog and power management ICs, serving industrial, infrastructure, and high-end consumer markets with high-reliability semiconductor solutions.
The X28HC256JIZ-15T1 belongs to Intersil's second-generation CMOS EEPROM product line, designed specifically for robust, 5V-only nonvolatile storage in harsh industrial and automotive environments where data integrity and long-term retention are mission-critical.
FAQ
What is the maximum write cycle time for X28HC256JIZ-15T1 during a byte write operation?
The maximum write cycle time (tWC) for X28HC256JIZ-15T1 is 5 ms under typical conditions. This is the worst-case duration the device requires to complete an internal write - though polling (DATA or Toggle bit) allows the host to resume operation as soon as the write finishes, often well before 5 ms elapses. The X28HC256JIZ-15T1 does not require fixed delays if polling is implemented in firmware.
Does X28HC256JIZ-15T1 support page write operations, and what is the page size?
Yes, X28HC256JIZ-15T1 supports 128-byte page write operations. Up to 128 consecutive bytes can be loaded into the internal write buffer before the automatic programming cycle begins - reducing total time to rewrite the full 32k memory to under 0.8 seconds. Address bits A7–A14 must remain constant across all bytes in a given page write sequence.
How does software data protection work on X28HC256JIZ-15T1, and can it be disabled?
X28HC256JIZ-15T1 implements nonvolatile software data protection activated by writing three specific values (0xAA, 0x55, 0xA0) to addresses 0x5555, 0x2AAA, and 0x5555. Once enabled, all subsequent writes require repeating this sequence. Protection can be reset using a six-step algorithm (0x55, 0x2AAA, 0x80, 0x5555, 0x20, 0x5555), after which X28HC256JIZ-15T1 returns to standard operating mode.
What are the key differences between X28HC256JIZ-15T1 and the commercial-grade X28HC256JZ-15 variant?
X28HC256JIZ-15T1 is rated for –40°C to +85°C operation and shipped in tape-and-reel (T1 suffix), while X28HC256JZ-15 is commercial grade (0°C to +70°C) and supplied in tube packaging. Both share identical electrical specs, pinout, and functionality - the distinction lies solely in temperature qualification and packaging format. X28HC256JIZ-15T1 is required for industrial or automotive applications outside 0°C–70°C ambient ranges.
Can X28HC256JIZ-15T1 be used in systems with 3.3V logic interfaces?
No - X28HC256JIZ-15T1 is a 5V-only device. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output levels (VOH = 2.4 V min at –4 mA, VOL = 0.4 V max at 6 mA) are specified for 5V operation. Interfacing directly with 3.3V logic requires level-shifting circuitry; for native 3.3V compatibility, consider alternatives like ST M28W256FBD-150ZB6.
X28HC256JIZ-15T1 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:
- 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-15T1 FAQ
1.How can I place an order for X28HC256JIZ-15T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JIZ-15T1 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-15T1 reliable?
The price and inventory of X28HC256JIZ-15T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JIZ-15T1 is usually 5 days.
3.What payment methods are accepted for X28HC256JIZ-15T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JIZ-15T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JIZ-15T1?
X28HC256JIZ-15T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JIZ-15T1 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-15T1?
For technical support, including X28HC256JIZ-15T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JIZ-15T1 requirements.
6.How does Aetrix verify that X28HC256JIZ-15T1 is sourced from the original manufacturer or authorized distributors?
All X28HC256JIZ-15T1 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-15T1 meets industry standards.
7.What is the process for return or replacement of X28HC256JIZ-15T1?
All X28HC256JIZ-15T1 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JIZ-15T1, 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-15T1 part is unused and in its original packaging.
Return procedure for X28HC256JIZ-15T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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