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Renesas X28HC256JZ-15
- Part No.:
- X28HC256JZ-15
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JZ-15.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,783
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Product details
Overview
X28HC256JZ-15 from Intersil is a 32k × 8-bit (256 kbit), 5V-only, byte-alterable CMOS EEPROM with 150 ns access time, fabricated using textured poly floating gate technology. It supports 128-byte page writes (≤0.8 s full rewrite), DATA polling and Toggle bit 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-15 datasheet, X28HC256JZ-15 pinout, X28HC256JZ-15 application, or X28HC256JZ-15 equivalent, key selection criteria include 5V-only operation, 100,000 write cycles endurance, 100-year data retention, RoHS-compliant 32-lead PLCC packaging, and compatibility with legacy 8-bit microcontroller buses requiring simple CE/OE/WE control.
Technical Context
The X28HC256JZ-15 implements a two-line control architecture (CE + OE for reads; CE + WE for writes) to eliminate bus contention in multi-device memory arrays. Its internal timing logic latches address on the last falling edge of CE or WE and data on the first rising edge, enabling both CE-controlled and WE-controlled write cycles.
It features dual write status reporting via I/O7 (DATA polling) and I/O6 (Toggle bit), allowing host firmware to avoid fixed delays during byte/page writes. The device integrates hardware VCC-sense write inhibition below ~3.5 V and supports software data protection activation via a three-byte unlock sequence to AE addresses (5555H, 2AAAH, 5555H).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32k × 8-bit (256 kbit); directly maps to 8-bit parallel bus with A0–A14 addressing |
| Access Time | 150 ns max; ensures compatibility with 6–7 MHz 8-bit microcontrollers without wait states |
| Write Cycle Time | 5 ms typical; internal self-timed programming eliminates need for external timing control |
| Endurance | 100,000 write cycles per byte; validated for field-reprogrammable calibration tables and configuration logs |
| Data Retention | 100 years at +25°C; guaranteed nonvolatile storage for lifetime-critical system parameters |
| Supply Voltage | 5 V ±10%; operates from standard TTL/CMOS logic rails without auxiliary supplies |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded instrumentation and telecom line cards |
| Power Consumption | 60 mA active / 500 µA standby; enables low-power mode operation in battery-backed systems |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, N32.45x55 footprint (12.32 mm × 14.86 mm), surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus; selects one of 32,768 bytes; A7–A14 define 128-byte page boundaries for fast bulk writes |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; carries data during read/write; I/O6 and I/O7 serve as status bits (Toggle/Data Poll) |
| CE | Chip Enable | Active-low primary device select; must be LOW to enable any read/write; HIGH forces high-Z output and standby current |
| OE | Output Enable | Active-low read control; used with CE to gate output drivers; HIGH disables outputs during writes |
| WE | Write Enable | Active-low write control; falling edge latches data; rising edge initiates 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 8 devices |
| VSS | Ground | Reference ground; must be low-impedance return path for I/O and core logic |
| NC (Pins 1, 12, 17, 26) | No Connect | Unbonded pins; must remain unconnected; no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell technology | Eliminates pre-erase requirement and over-erase risk; enables true byte-alterability without block erasure |
| 128-byte page write capability | Reduces full-memory rewrite time from >30 s (byte-by-byte) to ≤0.8 s; critical for firmware update staging |
| DATA polling (I/O7) and Toggle bit (I/O6) | Enables interrupt-free, deterministic write completion detection in bare-metal firmware without timer overhead |
| JEDEC-standard software data protection | Three-byte unlock sequence (5555H/2AAAH/5555H) prevents accidental writes during power transitions or debug sessions |
| Hardware VCC sense write inhibit | Automatically blocks writes when VCC drops below ~3.5 V; protects against corruption during brown-out conditions |
| RoHS-compliant 32-lead PLCC | Lead-free matte tin terminations compatible with SnPb and Pb-free soldering; MSL level per J-STD-020 |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing user-configurable I/O mapping, PID loop parameters, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter register bank accessed via 8-bit parallel bus during boot and runtime reconfiguration. Use Value: 100,000 write cycles support daily field recalibration; 100-year retention ensures integrity across equipment lifetimes exceeding 15 years. |
Use Scenario: Holding factory-calibrated sensor offsets, gain coefficients, and safety-critical operational limits in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration vault with software protection enabled post-calibration. Use Value: Hardware VCC-sense and software lock prevent corruption during battery swaps or ESD events; 150 ns access enables real-time parameter fetch during signal acquisition. |
| Telecom Line Card Bootloader Settings | Automotive Body Control Module Defaults |
|
Use Scenario: Preserving MAC address, firmware version flags, and port-specific initialization values in DSLAM and ONU line cards. IC Role / Device Role / Timing Role: Standalone configuration store interfaced to 8051 or Z80 derivatives; CE-decoded for array expansion. Use Value: Page write reduces bootloader update time by 97% vs. byte writes; 500 µA standby current minimizes quiescent draw in always-on network gear. |
Use Scenario: Retaining door lock logic defaults, window auto-up/down thresholds, and lighting fade profiles in automotive BCMs. IC Role / Device Role / Timing Role: Robust parameter storage operating across cold-crank (4.5 V) to load-dump (18 V) transients via external regulation. Use Value: 5 V ±10% tolerance and -10°C to +85°C bias range ensure operation under vehicle electrical stress; software protection prevents unauthorized reprogramming. |
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 organization but uses different software unlock sequence (AAH/55H/A0H) | Through-hole mounting only; lacks PLCC thermal performance and board space efficiency | Select for legacy through-hole designs where socket replacement is required and reflow is not available |
| M95256-DW | 256 kbit SPI interface; 5 MHz clock; 10 MHz write speed; 1 million write cycles; SO8 package | Serial interface reduces pin count but increases firmware overhead; incompatible with parallel bus architectures | Select for new designs prioritizing PCB area savings and simplified routing, provided SPI host support exists |
Compared with AT28C256-15PU and M95256-DW, the X28HC256JZ-15 delivers direct 8-bit parallel compatibility with legacy microcontrollers, superior thermal dissipation in PLCC packaging, and proven 100,000-cycle endurance in industrial temperature cycling - making it optimal for drop-in replacement in existing 5V bus-based systems.
Availability
X28HC256JZ-15 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and telecom infrastructure requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for X28HC256JZ-15 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 U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal ICs, with leadership in power management and nonvolatile memory solutions for industrial and infrastructure markets.
The X28HC256 product line was designed for robust, 5V-only parallel EEPROM replacement in legacy embedded systems where pin compatibility, predictable timing, and field-programmable reliability are mandatory.
FAQ
What is the maximum operating temperature range for the X28HC256JZ-15?
The X28HC256JZ-15 is rated for commercial operation from 0°C to +70°C. Its bias temperature range extends to –10°C to +85°C, supporting reliable function in warm ambient enclosures. This differs from the industrial-grade X28HC256JI-15, which is specified from –40°C to +85°C. The X28HC256JZ-15 maintains full DC and AC specifications within its rated range.
Does the X28HC256JZ-15 require external high voltage for programming?
No, the X28HC256JZ-15 operates with a single 5V supply and requires no external high voltage or charge pump circuitry. Its Direct Write™ cell technology enables full byte-alterable programming using only VCC = 5V ±10%. All write operations - including page writes and software protection activation - are performed at standard logic levels, simplifying system design and eliminating HV generator components.
How does the software data protection feature work on the X28HC256JZ-15?
The X28HC256JZ-15 implements JEDEC-standard software data protection: after the first successful write, a three-byte unlock sequence (write 0xAA to address 5555H, then 0x55 to 2AAAH, then 0xAA to 5555H) must precede any subsequent write. Once enabled, the X28HC256JZ-15 remains protected across power cycles until the six-byte reset sequence is issued. This prevents accidental writes during power-up/down or firmware debugging.
Can the X28HC256JZ-15 be used in a memory array with other X28HC256 variants?
Yes, the X28HC256JZ-15 is fully compatible with other X28HC256 family members (e.g., X28HC256JI-15, X28HC256PZ-15) in shared-bus arrays. Its two-line control architecture (CE + OE for reads, CE + WE for writes) eliminates bus contention. CE should be individually decoded per device, while OE and WE may be common across the array - a configuration validated in Intersil's system design guidelines for multi-chip memory expansion.
What is the purpose of the NC pins on the X28HC256JZ-15 PLCC package?
The X28HC256JZ-15 PLCC package has four NC (No Connect) pins: 1, 12, 17, and 26. These pins are physically present but internally unbonded and electrically isolated. They must remain unconnected in PCB layout and schematic design. Routing traces to or placing vias on NC pins violates the device's thermal and electrical specifications and may compromise reliability or cause unintended coupling.
X28HC256JZ-15 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:
- 150 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-15 FAQ
1.How can I place an order for X28HC256JZ-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JZ-15 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-15 reliable?
The price and inventory of X28HC256JZ-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JZ-15 is usually 5 days.
3.What payment methods are accepted for X28HC256JZ-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JZ-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JZ-15?
X28HC256JZ-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JZ-15 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-15?
For technical support, including X28HC256JZ-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JZ-15 requirements.
6.How does Aetrix verify that X28HC256JZ-15 is sourced from the original manufacturer or authorized distributors?
All X28HC256JZ-15 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-15 meets industry standards.
7.What is the process for return or replacement of X28HC256JZ-15?
All X28HC256JZ-15 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JZ-15, 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-15 part is unused and in its original packaging.
Return procedure for X28HC256JZ-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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