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Renesas X28HC256PZ-12
- Part No.:
- X28HC256PZ-12
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- -
- Datasheet:
-
X28HC256PZ-12.pdf
- Description:
- IC EEPROM 256KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,530
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Product details
Overview
X28HC256PZ-12 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable CMOS EEPROM with 120 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 zero external high-voltage programming.
For engineers reviewing the X28HC256PZ-12 datasheet, X28HC256PZ-12 pinout, X28HC256PZ-12 application, or X28HC256PZ-12 equivalent, key selection considerations include its 5V-only operation, PDIP-28 RoHS-compliant package, 100,000 write endurance, 100-year data retention, and dual hardware/software write protection mechanisms.
Technical Context
The X28HC256PZ-12 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 self-timed internal programming without erase-before-write cycles or complex algorithms.
It features dual write status reporting via I/O7 (DATA polling) and I/O6 (Toggle bit), both compliant with read cycle timing constraints. Hardware protection includes VCC sense (write inhibit below ~3.5 V) and signal-level inhibition (OE low, WE high, or CE high).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 kbit (32,768 × 8 bits) - supports full system configuration storage in legacy microcontroller-based designs. |
| Access time | 120 ns - enables direct interface with 8-bit MCUs operating at ≤8 MHz without wait states. |
| Write endurance | 100,000 cycles per byte - sufficient for firmware revision logging or calibration data updates over 10+ years of field operation. |
| Data retention | 100 years at +25°C - guarantees long-term integrity of stored calibration constants or security keys without refresh. |
| Supply voltage | 5 V ±10% - compatible with legacy TTL/CMOS logic rails and eliminates need for auxiliary voltage regulators. |
| Operating temperature | 0°C to +70°C - qualified for commercial-grade embedded applications including point-of-sale terminals and instrumentation front-ends. |
| Active current | 60 mA max - defines peak power budget during write operations; requires local 0.1 µF ceramic decoupling per device. |
| Standby current | 500 µA max (CMOS inputs) - enables low-power sleep modes in battery-backed systems when CE is deasserted. |
Pinout & Package
Package: 28-pin Plastic Dual In-line Package (PDIP), RoHS-compliant, 0.6-inch width (E28.6 drawing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selects one of 32,768 bytes; A7–A14 define page boundaries for 128-byte page writes. |
| I/O0–I/O7 | Bi-directional data bus | Tri-state data path; carries write data during CE/WE active, outputs read data during CE/OE active, high-Z otherwise. |
| CE | Chip Enable | Primary device select; must be LOW for all read/write operations; drives device into standby (500 µA) when HIGH. |
| OE | Output Enable | Controls output buffers only; used with CE LOW to initiate reads; HIGH during writes to prevent bus contention. |
| WE | Write Enable | Latches write data on falling edge (with CE LOW); rising edge triggers internal self-timed programming cycle. |
| VCC | Power supply | +5 V ±10% supply; requires local 0.1 µF ceramic + shared 4.7 µF bulk capacitor per 8 devices for transient suppression. |
| VSS | Ground | Reference return for all signals and power; must be low-impedance connection to minimize noise coupling into I/O lines. |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte page write | Reduces full-memory rewrite time from >30 s (byte-by-byte) to <0.8 s, enabling fast field firmware patching. |
| DATA polling (I/O7) | Allows host MCU to poll completion status with single-bit test-no interrupt lines or external timing components required. |
| Toggle bit polling (I/O6) | Eliminates need to store last-written address/data; simplifies multi-device array updates by enabling stateless polling. |
| JEDEC software data protection | Nonvolatile lock activated via 3-byte sequence; prevents accidental writes during power-up/down without external circuitry. |
| Direct Write™ cell | Enables true 5V-only operation: no external high-voltage generator, no over-erase correction, no pre-erase step. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data Retention |
|---|---|
|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers with no battery backup. IC Role / Device Role / Timing Role: Nonvolatile parameter register bank accessed via parallel bus during boot and runtime reconfiguration. Use Value: 100,000 write cycles support daily parameter adjustments over 27 years; 100-year retention ensures data survival across equipment lifecycles. |
Use Scenario: Holding factory-calibrated sensor offsets and gain coefficients in portable diagnostic instruments subject to frequent thermal cycling. IC Role / Device Role / Timing Role: Standalone 8-bit parallel EEPROM interfaced directly to microcontroller GPIOs for deterministic read/write timing. Use Value: 120 ns access time allows real-time calibration lookup without CPU wait states; RoHS-compliant PDIP suits through-hole assembly for medical-grade PCBs. |
| Point-of-Sale Terminal Firmware Patching | Legacy Automotive Body Control Module NVM |
|
Use Scenario: Field-updating tax rate tables, receipt formatting rules, and language strings in retail terminals deployed globally. IC Role / Device Role / Timing Role: Page-write-capable nonvolatile memory enabling batch updates via serial-to-parallel bridge ICs. Use Value: 128-byte page writes cut update time by 98% vs. byte writes; software protection prevents corruption during brown-out events. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive BCMs where reflow soldering is not used. IC Role / Device Role / Timing Role: Through-hole-mounted EEPROM providing robust, solder-process-compatible NVM in harsh under-hood environments. Use Value: Pb-free PDIP package qualified for wave solder only-ensures mechanical reliability in vibration-prone automotive chassis mounting. |
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; 5V-only; same 32k×8 organization; 100,000-cycle endurance; PDIP-28 package. | Slower timing limits use with higher-speed MCUs; identical pinout enables drop-in replacement where 120 ns is not required. | Select when system timing margin permits longer access; verify software polling loop timing against 150 ns spec. |
| MX28LV256APCI-12 | 120 ns access; 3.3 V/5 V dual-supply capable; 100,000-cycle endurance; PDIP-28; supports 64-byte page writes. | Requires level-shifting if interfacing exclusively with 5 V logic; smaller page size increases full-rewrite time vs. X28HC256PZ-12. | Choose for mixed-voltage systems or future-proofing; confirm VCC=5 V operation meets MX28LV256A's 5 V absolute max rating. |
Compared with AT28C256-15PU and MX28LV256APCI-12, the X28HC256PZ-12 delivers optimal balance of speed (120 ns), proven 5 V robustness, and industry-standard software protection-making it preferred for cost-sensitive, legacy 5 V designs where timing and reliability are tightly coupled.
Availability
X28HC256PZ-12 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, point-of-sale terminals, and automotive body electronics requiring stable component supply across extended product lifecycles.
Supply support for X28HC256PZ-12 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 X28HC256PZ-12 belongs to Intersil's second-generation CMOS EEPROM product line, designed specifically for 5 V-only embedded systems requiring robust, easy-to-integrate nonvolatile memory with zero external programming voltage.
FAQ
What is the maximum operating temperature range for the X28HC256PZ-12?
The X28HC256PZ-12 is specified for commercial operation from 0°C to +70°C. This range is defined in the Ordering Information table on page 2 of the FN8108 Rev 5.00 datasheet and applies specifically to the "PZ" suffix variant. Industrial variants (e.g., X28HC256PIZ-12) extend to –40°C to +85°C, but the X28HC256PZ-12 does not qualify for that extended range.
Does the X28HC256PZ-12 require external high-voltage circuitry for programming?
No, the X28HC256PZ-12 operates with a single 5 V supply and requires no external high-voltage generators, VP-P control circuits, or erase-before-write sequences. Its Direct Write™ cell technology enables full byte and page writes using only standard TTL/CMOS logic levels, as confirmed in the Features section on page 1 of the datasheet.
How does software data protection work on the X28HC256PZ-12?
Software data protection on the X28HC256PZ-12 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. This feature is JEDEC-standard and nonvolatile, as detailed on pages 12–13 of the datasheet.
What is the pin-compatible alternative to the X28HC256PZ-12 in PDIP-28 package?
The AT28C256-15PU is a pin-compatible alternative in PDIP-28 package with identical 32k×8 organization and 5 V-only operation. While its 150 ns access time is slower than the X28HC256PZ-12's 120 ns, its pinout, control signals (CE/OE/WE), and software protection model match exactly-enabling drop-in replacement where timing margin permits.
Can the X28HC256PZ-12 be used in reflow soldering processes?
No, the X28HC256PZ-12 is a Pb-free PDIP package intended only for through-hole wave solder processing. Note 2 on page 2 of the datasheet explicitly states: "Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications." Reflow will damage the package.
X28HC256PZ-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- -
- Memory Format:
- EEPROM
- Technology:
- -
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- 28-PDIP
X28HC256PZ-12 FAQ
1.How can I place an order for X28HC256PZ-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256PZ-12 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 X28HC256PZ-12 reliable?
The price and inventory of X28HC256PZ-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256PZ-12 is usually 5 days.
3.What payment methods are accepted for X28HC256PZ-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256PZ-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256PZ-12?
X28HC256PZ-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256PZ-12 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 X28HC256PZ-12?
For technical support, including X28HC256PZ-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256PZ-12 requirements.
6.How does Aetrix verify that X28HC256PZ-12 is sourced from the original manufacturer or authorized distributors?
All X28HC256PZ-12 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 X28HC256PZ-12 meets industry standards.
7.What is the process for return or replacement of X28HC256PZ-12?
All X28HC256PZ-12 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256PZ-12, 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 X28HC256PZ-12 part is unused and in its original packaging.
Return procedure for X28HC256PZ-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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