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Renesas X28HC256JZ-12T1
- Part No.:
- X28HC256JZ-12T1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JZ-12T1.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,234
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Product details
Overview
X28HC256JZ-12T1 from Intersil is a 32k × 8-bit (256 kbit), 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 100-year data retention.
For engineers reviewing the X28HC256JZ-12T1 datasheet, X28HC256JZ-12T1 pinout, X28HC256JZ-12T1 application, or X28HC256JZ-12T1 equivalent, key selection considerations include its 120 ns read timing, 5V-only operation without external high-voltage circuitry, RoHS-compliant 32-lead PLCC package, and support for both CE- and WE-controlled write cycles in embedded systems with strict power-up/down data integrity requirements.
Technical Context
The X28HC256JZ-12T1 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 Direct Write™ cell structure enables self-timed, no-erase-before-write operation with no over-erase risk.
It features dual write status reporting via I/O7 (DATA polling) and I/O6 (Toggle bit), both compliant with standard read cycle timing. Hardware data 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 | 32k × 8-bit (256 kbit) - provides sufficient nonvolatile storage for configuration registers, calibration data, or firmware patches in resource-constrained microcontroller systems. |
| Access time | 120 ns - enables direct interfacing with 8-bit microcontrollers operating at ≤8 MHz without wait states. |
| Write endurance | 100,000 cycles per byte - supports frequent field updates (e.g., metering logs, sensor calibration) over product lifetime. |
| Data retention | 100 years - ensures long-term data integrity in unpowered storage for industrial and infrastructure applications. |
| Supply voltage | 5 V ±10% - compatible with legacy 5V logic families and eliminates need for auxiliary voltage rails. |
| Page write capacity | 128 bytes - reduces system-level write overhead by enabling burst programming of related parameters (e.g., entire ADC calibration table). |
| Standby current | 500 µA (CMOS inputs) - minimizes quiescent power in always-on monitoring subsystems. |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, dimensions 12.57 mm × 15.11 mm (N32.45x55). Pin 1 identifier located at corner with notch or dot; body material is thermoplastic with matte tin (e3) termination finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selecting one of 32,768 bytes; A7–A14 define page address during 128-byte page writes. |
| I/O0–I/O7 | Data bidirectional bus | 8-bit parallel interface; I/O7 reports DATA polling status, I/O6 reports Toggle bit status during internal write cycles. |
| CE | Chip Enable | Active-low primary device select; must be LOW to enable read/write; HIGH places outputs in high-Z and reduces ICC to 500 µA. |
| OE | Output Enable | Active-low read control; used with CE to gate output buffers and prevent bus contention in multi-device systems. |
| WE | Write Enable | Active-low write control; falling edge latches address/data; rising edge initiates internal programming cycle. |
| VCC | Power supply | +5 V supply pin; requires local 0.1 µF ceramic decoupling capacitor per device per datasheet recommendation. |
| VSS | Ground | Reference ground for all signals and power; must be low-impedance connection to minimize noise coupling into EEPROM array. |
| NC | No connect | Pins 1, 12, 17, 26 are internally unconnected; must remain unconnected on PCB to avoid parasitic coupling or ESD paths. |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell technology | Enables reliable 5V-only operation without external high-voltage generators or complex programming algorithms. |
| 128-byte page write capability | Reduces total system write time to ≤0.8 s for full memory rewrite, improving firmware update efficiency in field-deployed devices. |
| DATA polling (I/O7) and Toggle bit (I/O6) | Eliminates need for fixed delay loops or external interrupt hardware-software can poll status synchronously during write operations. |
| JEDEC-standard software data protection | Nonvolatile protection activated after first write sequence; prevents accidental writes during power transitions without external circuitry. |
| Hardware write inhibit | Automatic disable of write functions when VCC < ~3.5 V or when OE is low / WE is high / CE is high-ensures data integrity at power-up/down. |
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 that operate continuously across temperature extremes. IC Role / Device Role / Timing Role: Nonvolatile parameter register bank accessed during boot and runtime via parallel 8-bit bus; 120 ns access supports real-time reconfiguration without CPU stall. Use Value: 100,000 write cycles and 100-year retention ensure decades of field service without recalibration or backup battery dependency. |
Use Scenario: Retaining factory-calibrated sensor offsets, gain coefficients, and safety-critical operational limits in portable diagnostic equipment subject to repeated sterilization cycles. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration vault; software data protection prevents corruption during unexpected power loss during clinical use. Use Value: Dual status bits (I/O6/I/O7) allow deterministic write completion detection in safety-certified firmware, eliminating race conditions in critical data logging. |
| Automotive Body Control Module NVM | Telecom Line Card Option Settings |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock behavior in automotive BCMs exposed to -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade (X28HC256JI-12 variant) EEPROM interfaced directly to 8051-based MCU; CE/OE dual-control prevents bus conflicts during CAN message handling. Use Value: RoHS-compliant PLCC package withstands automotive reflow profiles; 500 µA standby current extends battery life in parked vehicle mode. |
Use Scenario: Storing port-specific provisioning data (e.g., line impedance, codec selection, power class) on carrier-grade DSLAM line cards requiring hot-swap compatibility. IC Role / Device Role / Timing Role: System-level configuration manager; page write capability allows atomic update of all 128-byte port settings without partial-write corruption. Use Value: Hardware VCC sense and signal-level write inhibit guarantee zero unintended writes during card insertion/removal under live backplane power. |
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; 100,000-cycle endurance; same 32k×8 organization and 5V operation. | Slower timing limits use with higher-speed MCUs; through-hole PDIP suits legacy prototyping but lacks RoHS-compliant PLCC thermal profile. | Select when board layout uses through-hole mounting or when 150 ns timing suffices and PLCC reflow is unavailable. |
| M95256-DW DW | Serial SPI interface (not parallel); 5V-tolerant I/O; 20 MHz max clock; 400 kHz write cycle; SO8 package. | Requires SPI controller instead of parallel bus; lower pin count simplifies routing but increases software overhead for bulk writes. | Select when PCB space is constrained, serial interface is already present, and write latency tolerance exceeds 5 ms per byte. |
Compared with AT28C256-15PU and M95256-DW DW, the X28HC256JZ-12T1 delivers faster 120 ns parallel access, RoHS-compliant PLCC packaging suitable for automated SMT assembly, and deterministic page write timing-making it optimal for industrial control and telecom systems where deterministic timing and robustness outweigh serial interface convenience.
Availability
X28HC256JZ-12T1 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed RoHS compliance.
Supply support for X28HC256JZ-12T1 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 X28HC256JZ-12T1 belongs to Intersil's second-generation CMOS EEPROM product line, designed specifically for mission-critical nonvolatile storage in environments demanding 100-year data retention, 100,000-cycle endurance, and robust power-transition immunity.
FAQ
What is the maximum operating temperature range for the X28HC256JZ-12T1?
The X28HC256JZ-12T1 is rated for commercial temperature operation from 0°C to +70°C. Its PLCC package and internal design meet this specification under recommended operating conditions of 5 V ±10%. For extended temperature applications, the X28HC256JI-12 variant supports -40°C to +85°C.
Does the X28HC256JZ-12T1 require external high-voltage circuitry for programming?
No. The X28HC256JZ-12T1 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 true 5V-only byte and page programming, as confirmed in the FN8108 Rev 5.00 datasheet.
How does software data protection work on the X28HC256JZ-12T1?
Software data protection on the X28HC256JZ-12T1 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 nonvolatile and persists for the life of the X28HC256JZ-12T1 unless explicitly cleared.
Can the X28HC256JZ-12T1 be used in a system with mixed 3.3V and 5V logic?
The X28HC256JZ-12T1 is a 5V-only device with TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). While its inputs accept 3.3V logic HIGH levels, its outputs swing to 0.4 V (LOW) and 2.4 V (HIGH) under load-insufficient to drive standard 3.3V CMOS inputs reliably. Level-shifting is required for interoperability with 3.3V systems.
What is the purpose of the NC pins on the X28HC256JZ-12T1 PLCC package?
The X28HC256JZ-12T1 PLCC package has four NC (No Connect) pins: 1, 12, 17, and 26. These pins are not bonded internally and serve no electrical function. They must remain unconnected on the PCB to prevent parasitic coupling, unintended current paths, or ESD discharge risks-per Intersil's pin description table on page 3 of FN8108 Rev 5.00.
X28HC256JZ-12T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- 120 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-12T1 FAQ
1.How can I place an order for X28HC256JZ-12T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JZ-12T1 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-12T1 reliable?
The price and inventory of X28HC256JZ-12T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JZ-12T1 is usually 5 days.
3.What payment methods are accepted for X28HC256JZ-12T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JZ-12T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JZ-12T1?
X28HC256JZ-12T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JZ-12T1 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-12T1?
For technical support, including X28HC256JZ-12T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JZ-12T1 requirements.
6.How does Aetrix verify that X28HC256JZ-12T1 is sourced from the original manufacturer or authorized distributors?
All X28HC256JZ-12T1 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-12T1 meets industry standards.
7.What is the process for return or replacement of X28HC256JZ-12T1?
All X28HC256JZ-12T1 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JZ-12T1, 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-12T1 part is unused and in its original packaging.
Return procedure for X28HC256JZ-12T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
X28HC256JZ-12T1 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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