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Renesas X28HC256SZ-12
- Part No.:
- X28HC256SZ-12
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
X28HC256SZ-12.pdf
- Description:
- IC EEPROM 256KBIT PAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,564
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Product details
Overview
X28HC256SZ-12 from Intersil is a 256 kbit (32k × 8), 5V-only, byte-alterable EEPROM with 120 ns access time, RoHS-compliant 28-pin SOIC package, and industrial-grade reliability-used for nonvolatile configuration storage in embedded controllers and power management systems.
For engineers reviewing the X28HC256SZ-12 datasheet, X28HC256SZ-12 pinout, X28HC256SZ-12 application, or X28HC256SZ-12 equivalent, this page delivers verified timing specs, JEDEC software data protection implementation, page write cycle behavior, and real-world endurance (100,000 cycles) and retention (100 years) metrics.
Technical Context
The X28HC256SZ-12 implements a CMOS-based Direct Write™ floating-gate cell architecture with textured poly technology, enabling single 5V supply operation without external high-voltage programming circuits. It supports both CE- and WE-controlled write cycles with automatic internal timing.
It features dual early-write-detection mechanisms-DATA polling on I/O7 and Toggle bit on I/O6-and integrates hardware-level VCC sense (3.5V threshold) plus software data protection via a 3-byte unlock sequence to prevent inadvertent writes during power transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8 bits); supports full memory rewrite in <0.8 s using 128-byte page writes |
| Access time | 120 ns; defines minimum read cycle time for synchronous bus interfacing at up to ~8.3 MHz |
| Write endurance | 100,000 write/erase cycles per byte; validated for long-life firmware parameter logging |
| Data retention | 100 years at +25°C; ensures configuration integrity across product lifecycle without refresh |
| Supply voltage | 5 V ±10%; operates reliably across full industrial input range without regulation overhead |
| Operating temperature | 0°C to +70°C; qualified for commercial-grade embedded applications including telecom line cards and industrial HMIs |
| Package | 28-pin SOIC (300-mil, RoHS-compliant, MDP0027 footprint); compatible with standard reflow and wave solder processes |
| Power consumption | 60 mA active / 500 µA standby; enables low-quiescent-power system sleep modes |
Pinout & Package
28-pin Small Outline Integrated Circuit (SOIC), 300-mil body width, RoHS-compliant matte tin e3 termination (MDP0027). Designed for surface-mount assembly with JEDEC MS-013-AE land pattern compatibility.
| 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 | Data bidirectional bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for Toggle bit status reporting |
| CE | Chip Enable | Active-low primary device select; must be LOW to enable read/write; HIGH places device in 500 µA standby |
| OE | Output Enable | Active-low control for output buffers; used with CE to initiate reads and suppress bus contention |
| WE | Write Enable | Active-low write strobe; latches data on rising edge (with CE) or falling edge (last of CE/WE); controls byte/page load timing |
| VCC | Power supply | +5 V ±10% supply; powers all logic and EEPROM array; decoupling requires 0.1 µF ceramic + 4.7 µF bulk per 8 devices |
| VSS | Ground | Reference return path; shared with system ground plane; critical for noise immunity in mixed-signal environments |
Key Features
| Feature | Design Value |
|---|---|
| 128-byte page write | Reduces full-memory update time to <0.8 s; eliminates need for external page buffer logic |
| DATA polling (I/O7) | Enables software-driven write completion detection without interrupts or external hardware |
| Toggle bit (I/O6) | Allows status monitoring without saving last address/data-ideal for multi-device arrays |
| JEDEC software data protection | Nonvolatile lock activated by 3-byte sequence; prevents accidental writes during power-up/down |
| Direct Write™ cell technology | Eliminates erase-before-write requirement and over-erase risk; simplifies firmware update routines |
Applications
| Industrial PLC Configuration Storage | Telecom Line Card Parameter Retention |
|---|---|
|
Use Scenario: Storing calibrated sensor offsets, I/O mapping tables, and runtime fault logs in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via parallel bus during boot and runtime updates. Use Value: 100,000-cycle endurance supports daily calibration updates over 27+ years; 120 ns access enables fast boot-time parameter loading. |
Use Scenario: Preserving port provisioning settings, gain coefficients, and alarm thresholds in DSLAM and ONU line cards. IC Role / Device Role / Timing Role: Standalone 5V EEPROM interfaced to microcontroller GPIOs for field-upgradable operational parameters. Use Value: Software data protection prevents corruption during brown-out events; RoHS SOIC fits dense telecom PCB layouts. |
| Medical Device Calibration Data | Automotive Body Control Module Settings |
|
Use Scenario: Archiving factory-calibrated ADC reference points and user-adjusted therapy parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile memory mapped to MCU's external memory interface during initialization. Use Value: 100-year data retention guarantees traceability across device lifetime; 500 µA standby current extends battery backup duration. |
Use Scenario: Holding seat/mirror position presets, lighting profiles, and door lock configurations in automotive BCMs. IC Role / Device Role / Timing Role: Parallel EEPROM directly connected to 8-bit MCU bus for deterministic read/write latency. Use Value: Hardware VCC sense (3.5 V threshold) blocks writes during ignition cycling; 28-pin SOIC simplifies automated assembly. |
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; no Toggle bit support; 10,000-cycle endurance | Lower speed and endurance; suited for cost-sensitive, low-update-rate legacy designs | Select only if board layout uses through-hole PDIP and timing budget allows 150 ns latency |
| M95256-DW DW | Serial SPI interface; 5 ms write cycle; 1 MHz clock; 400 kHz I²C-compatible mode | Requires serial protocol stack; eliminates parallel bus routing but adds firmware overhead | Prefer when PCB space is constrained and MCU has SPI peripheral; avoid for high-throughput parameter updates |
Compared with AT28C256-15PU and M95256-DW DW, the X28HC256SZ-12 delivers faster parallel access (120 ns), higher endurance (100K vs. 10K cycles), and dual-status polling-making it optimal for systems requiring frequent, deterministic, and robust nonvolatile storage without serial protocol dependencies.
Availability
X28HC256SZ-12 is available at Aetrix Electronics and suitable for industrial PLC configuration storage, telecom line card parameter retention, and medical device calibration data applications requiring stable component supply and long-term obsolescence management.
Supply support for X28HC256SZ-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 X28HC256SZ-12 belongs to Intersil's second-generation CMOS EEPROM family, engineered for robust, 5V-only operation in embedded systems where data integrity across power cycles is mission-critical.
FAQ
What is the maximum write speed achievable with X28HC256SZ-12 in page write mode?
The X28HC256SZ-12 supports 128-byte page writes, enabling full 256 kbit memory rewrite in under 0.8 seconds. Each byte load cycle must occur within 100 µs of the prior WE transition; the internal programming completes in ≤5 ms after the final byte. This yields effective throughput of ~320 kbit/s during sustained page writes-significantly faster than byte-by-byte operation.
Does X28HC256SZ-12 require external high-voltage circuitry for programming?
No. The X28HC256SZ-12 operates with a single 5V ±10% supply and requires no external high-voltage generators, VP-P controls, or complex programming algorithms. Its Direct Write™ floating-gate technology enables true 5V-only byte and page writes-reducing BOM count and simplifying PCB design compared to older EEPROM architectures.
How does software data protection work on X28HC256SZ-12?
X28HC256SZ-12 implements JEDEC-standard software data protection: a nonvolatile lock activated by writing AAh to 5555h, 55h to 2AAAh, then A0h to 5555h. Once set, all subsequent writes require repeating this sequence. The feature prevents inadvertent writes during power-up/down and remains active until explicitly reset using a six-step unlock command.
Can X28HC256SZ-12 be used in systems with mixed 3.3V and 5V logic?
X28HC256SZ-12 is a 5V-only device with TTL-compatible inputs (VIH = 2.0 V min, VIL = 0.8 V max) and outputs (VOH = 2.4 V min at –4 mA). It can interface directly with 5V logic families. For 3.3V MCU interfaces, level-shifting is required on I/O, CE, OE, and WE lines to avoid violating input voltage limits and ensure reliable recognition of logic states.
What is the significance of the "Z" suffix in X28HC256SZ-12?
The "Z" in X28HC256SZ-12 denotes Intersil's Pb-free packaging: matte tin (e3) termination, RoHS-compliant materials, and MSL-3 reflow rating per J-STD-020. It confirms compatibility with both SnPb and lead-free soldering processes and distinguishes it from legacy non-RoHS variants like X28HC256S-12 (without Z).
X28HC256SZ-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
X28HC256SZ-12 FAQ
1.How can I place an order for X28HC256SZ-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256SZ-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 X28HC256SZ-12 reliable?
The price and inventory of X28HC256SZ-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256SZ-12 is usually 5 days.
3.What payment methods are accepted for X28HC256SZ-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256SZ-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256SZ-12?
X28HC256SZ-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256SZ-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 X28HC256SZ-12?
For technical support, including X28HC256SZ-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256SZ-12 requirements.
6.How does Aetrix verify that X28HC256SZ-12 is sourced from the original manufacturer or authorized distributors?
All X28HC256SZ-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 X28HC256SZ-12 meets industry standards.
7.What is the process for return or replacement of X28HC256SZ-12?
All X28HC256SZ-12 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256SZ-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 X28HC256SZ-12 part is unused and in its original packaging.
Return procedure for X28HC256SZ-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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