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Renesas X28HC256PIZ-15
- Part No.:
- X28HC256PIZ-15
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
X28HC256PIZ-15.pdf
- Description:
- IC EEPROM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,041
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Product details
Overview
X28HC256PIZ-15 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable CMOS EEPROM with 150 ns access time, -40°C to +85°C industrial temperature range, and 28-pin PDIP 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.
For engineers reviewing the X28HC256PIZ-15 datasheet, X28HC256PIZ-15 pinout, X28HC256PIZ-15 application, or X28HC256PIZ-15 equivalent, key selection criteria 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 5V microcontroller buses requiring nonvolatile storage with byte-level flexibility.
Technical Context
The X28HC256PIZ-15 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 allows up to 128 consecutive bytes to be loaded before automatic internal programming begins - provided successive WE transitions occur within 100 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8 bits) - supports full byte-addressable storage for firmware parameter tables or calibration data in embedded controllers. |
| Access time | 150 ns - compatible with 6–7 MHz 8-bit microcontrollers without wait states. |
| Write endurance | 100,000 cycles per byte - suitable for field-updatable configuration registers subject to infrequent but critical rewrites. |
| Data retention | 100 years at +25°C - ensures long-term integrity of stored calibration coefficients or security keys without refresh. |
| Supply voltage | 5 V ±10% - operates directly from standard TTL/CMOS logic rails without regulation overhead. |
| Operating temperature | -40°C to +85°C - qualified for industrial automation, motor drives, and outdoor instrumentation environments. |
| Page write size | 128 bytes - reduces host CPU overhead during bulk updates (e.g., logging buffers or firmware patch segments). |
| Standby current | 500 µA (CMOS inputs) - enables low-power sleep modes in battery-backed systems. |
Pinout & Package
Package: 28-pin Plastic Dual In-line Package (PDIP), RoHS-compliant, 0.600" wide (E28.6 drawing), through-hole mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selecting one of 32,768 byte locations; compatible with 8051, Z80, and 68K-family address decoding. |
| I/O0–I/O7 | Bidirectional data bus | True 8-bit parallel I/O interface - no external transceivers required; supports direct connection to microcontroller data bus. |
| CE | Chip Enable | Active-low device select; when HIGH, places outputs in high-Z and reduces ICC to 500 µA standby current. |
| OE | Output Enable | Active-low read control; used with CE to gate output drivers and prevent bus contention in shared-memory systems. |
| WE | Write Enable | Active-low write strobe; latches data on rising edge (with CE LOW) and initiates internal programming cycle. |
| VCC | Power supply | +5 V supply pin - requires local 0.1 µF ceramic decoupling per device per datasheet recommendation. |
| VSS | Ground | Signal and power ground reference - must be connected to system common ground plane with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell technology | Enables true byte-alterable writes without prior block erase - eliminates wear leveling complexity in firmware update routines. |
| 128-byte page write | Reduces total programming time for 32 kB memory to ≤0.8 s (vs. >30 s for byte-by-byte), accelerating field firmware upgrades. |
| DATA polling (I/O7) | Allows host to poll status via simple bit-test loop instead of fixed delays - cuts average write latency by ~50% in real-time systems. |
| Toggle bit polling (I/O6) | Eliminates need to store last written address/data for polling - simplifies code for multi-device EEPROM arrays in PLC modules. |
| JEDEC software data protection | Prevents inadvertent writes during power-up/down using 3-byte unlock sequence - removes requirement for external hardware write protect. |
| Industrial temperature grade | Validated operation from -40°C to +85°C - supports deployment in motor control cabinets, HVAC controllers, and railway signaling equipment. |
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 factory-floor environments. 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 ensure >10 years of daily parameter edits; 150 ns access enables real-time read-modify-write without interrupting scan cycles. |
Use Scenario: Retaining factory-calibrated sensor offsets, gain coefficients, and safety-critical diagnostic history in portable ultrasound and infusion pump systems. IC Role / Device Role / Timing Role: Secure, long-life data vault accessed only during service mode or power-on self-test sequences. Use Value: 100-year data retention guarantees calibration validity across product lifetime; software protection prevents accidental overwrite during field servicing. |
| Automotive Body Control Module (BCM) | Test Equipment Setup Profiles |
|
Use Scenario: Holding vehicle-specific configuration flags (e.g., mirror fold settings, lighting behavior) and driver preference memory in 12 V automotive BCMs. IC Role / Device Role / Timing Role: Power-fail-safe storage element interfaced to 8051-based MCU with brown-out detection circuitry. Use Value: Default VCC sense inhibits writes below 3.5 V - prevents corruption during ignition cycling; -40°C to +85°C rating meets AEC-Q100 Grade 2 requirements. |
Use Scenario: Saving instrument-specific calibration constants, test sequence definitions, and operator preferences in benchtop multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Field-updatable configuration repository accessed via dedicated MCU port during setup menu navigation. Use Value: Page write capability enables full profile reload in <1 second; 500 µA standby current extends battery life in portable test gear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT28C256-15PU | Same 256 kbit × 8, 150 ns, 28-pin PDIP, but uses standard CMOS process (not textured poly); endurance rated at 10,000 cycles. | Limited to less demanding applications where rewrite frequency is low (e.g., one-time factory programming). | Select AT28C256-15PU only if cost sensitivity outweighs endurance and long-term retention requirements. |
| MX28LV256APCI-15 | 256 kbit × 8, 150 ns, 28-pin PDIP, but requires 3.3 V core (5 V tolerant I/O); endurance 100,000 cycles, retention 100 years. | Requires level-shifting or mixed-voltage design; not drop-in compatible with pure 5 V systems. | Choose MX28LV256APCI-15 only when migrating toward lower-power 3.3 V platforms and redesigning power delivery. |
Compared with AT28C256-15PU and MX28LV256APCI-15, the X28HC256PIZ-15 delivers guaranteed 100,000-cycle endurance and native 5 V operation in a pin-compatible industrial-grade PDIP package - making it the optimal choice for legacy 5 V embedded systems requiring field-reprogrammable nonvolatile storage with long service life.
Availability
X28HC256PIZ-15 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, and test instrumentation requiring stable component supply across extended product lifecycles.
Supply support for X28HC256PIZ-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 power management ICs, now part of Renesas Electronics.
The X28HC256PIZ-15 belongs to Intersil's legacy EEPROM product line designed for robust, 5 V-compatible nonvolatile storage in industrial and automotive control systems where long-term data integrity and field upgradeability are critical.
FAQ
What is the maximum operating temperature range for the X28HC256PIZ-15?
The X28HC256PIZ-15 is specified for industrial operation from -40°C to +85°C. This range is validated per the datasheet's Recommended Operating Conditions and supports deployment in harsh environments such as motor control enclosures and outdoor telemetry units. The X28HC256PIZ-15 maintains full electrical compliance-including 150 ns access time and 500 µA standby current-across this entire span.
Does the X28HC256PIZ-15 require external high-voltage programming circuitry?
No. The X28HC256PIZ-15 operates from a single 5 V supply and requires no external high-voltage generators or VP-P control circuits. All programming is performed internally using Intersil's Direct Write™ technology. This eliminates external components and simplifies PCB layout - a key advantage of the X28HC256PIZ-15 over older EPROM or UV-erasable devices.
How does the page write function work on the X28HC256PIZ-15?
The X28HC256PIZ-15 supports 128-byte page writes: after the first byte is written, up to 127 additional bytes may be loaded within 100 µs of each preceding WE pulse. The internal programming cycle starts only after the 100 µs window expires. This allows the host to fetch next-byte data from another peripheral during loading - reducing total 32 kB rewrite time to under 0.8 s for the X28HC256PIZ-15.
Can the X28HC256PIZ-15 be used in systems with mixed 3.3 V and 5 V logic?
The X28HC256PIZ-15 is a 5 V-only device with TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). It is not 3.3 V tolerant on inputs or outputs. Interfacing with 3.3 V microcontrollers requires level translation on all control and data lines. For native 3.3 V systems, consider alternatives like the MX28LV256APCI-15 - but note the X28HC256PIZ-15 itself is strictly 5 V.
What happens to the X28HC256PIZ-15 during power-up or brown-out conditions?
The X28HC256PIZ-15 incorporates hardware data protection: write functions are inhibited when VCC falls below ~3.5 V (Default VCC Sense), and holding OE LOW, WE HIGH, or CE HIGH blocks writes during power transitions. Combined with JEDEC software protection, this ensures the X28HC256PIZ-15 remains immune to corruption during unstable supply conditions - a critical feature for mission-critical firmware storage.
X28HC256PIZ-15 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
X28HC256PIZ-15 FAQ
1.How can I place an order for X28HC256PIZ-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256PIZ-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 X28HC256PIZ-15 reliable?
The price and inventory of X28HC256PIZ-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256PIZ-15 is usually 5 days.
3.What payment methods are accepted for X28HC256PIZ-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256PIZ-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256PIZ-15?
X28HC256PIZ-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256PIZ-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 X28HC256PIZ-15?
For technical support, including X28HC256PIZ-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256PIZ-15 requirements.
6.How does Aetrix verify that X28HC256PIZ-15 is sourced from the original manufacturer or authorized distributors?
All X28HC256PIZ-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 X28HC256PIZ-15 meets industry standards.
7.What is the process for return or replacement of X28HC256PIZ-15?
All X28HC256PIZ-15 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256PIZ-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 X28HC256PIZ-15 part is unused and in its original packaging.
Return procedure for X28HC256PIZ-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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