My Inquiry
My Account
Renesas X28HC256JZ-15T1
- Part No.:
- X28HC256JZ-15T1
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
X28HC256JZ-15T1.pdf
- Description:
- IC EEPROM 256KBIT PAR 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,388
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
X28HC256JZ-15T1 from Intersil is a 256 kbit (32k × 8), 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 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 long-term data retention.
For engineers reviewing the X28HC256JZ-15T1 datasheet, X28HC256JZ-15T1 pinout, X28HC256JZ-15T1 application, or X28HC256JZ-15T1 equivalent, key selection criteria include 5V-only operation, 100,000 write endurance, 100-year data retention, PLCC-32 RoHS-compliant packaging, and compatibility with legacy 8-bit microcontroller buses requiring simple CE/OE/WE control.
Technical Context
The X28HC256JZ-15T1 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 external high-voltage circuitry or erase-before-write cycles.
It features dual write status reporting via I/O7 (DATA polling) and I/O6 (Toggle bit), both compliant with JEDEC read-cycle timing. Software data protection is nonvolatile and activated via a three-byte address sequence (5555h/2AAAh/5555h), remaining active across power cycles unless explicitly reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 256 kbit (32,768 × 8 bits); supports direct byte-level read/write without block erasure |
| Access time | 150 ns max; ensures compatibility with 6–7 MHz 8-bit microcontrollers using standard wait-state logic |
| Write endurance | 100,000 cycles per byte; validated for firmware configuration logging in field-deployed industrial controllers |
| Data retention | 100 years at +25°C; guarantees long-term calibration data integrity in unattended embedded systems |
| Supply voltage | 5 V ±10%; operates directly from legacy 5V logic rails without LDO regulation |
| Operating temperature | 0°C to +70°C; qualified for commercial-grade instrumentation and PC peripheral applications |
| Page write size | 128 bytes; reduces system-level write latency by >95% vs. sequential byte writes for bulk parameter updates |
Pinout & Package
Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, dimensions 12.57 mm × 15.11 mm (N32.45x55).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus selects one of 32,768 bytes; compatible with Z80, 8051, and 68K family address decoding |
| I/O0–I/O7 | Bidirectional data bus | 8-bit parallel interface; tri-states when CE or OE is HIGH to prevent bus contention in shared-memory systems |
| CE | Chip Enable | Active-low primary device select; enables all operations and reduces standby current to 500 µA when HIGH |
| OE | Output Enable | Active-low read strobe; controls output buffers independently of CE to support multiplexed bus architectures |
| WE | Write Enable | Active-low write strobe; latches data on rising edge (with CE) and initiates self-timed internal programming |
| VCC | Power supply | +5 V supply; powers core logic and EEPROM array; no auxiliary voltages required |
| VSS | Ground | Reference return path; requires local 0.1 µF ceramic decoupling per device per datasheet layout guidelines |
| NC (Pins 1, 12, 17, 26) | No connect | Unbonded die pads; must remain unconnected on PCB to avoid signal integrity or reliability issues |
Key Features
| Feature | Design Value |
|---|---|
| Direct Write™ cell technology | Enables 5V-only operation with no external high-voltage generators or complex programming algorithms |
| 128-byte page write | Reduces full-memory rewrite time from ~32 s (byte mode) to ≤0.8 s, critical for fast factory calibration |
| DATA polling (I/O7) | Allows host CPU to poll completion status using a single bit test-no interrupt lines or external hardware needed |
| Software data protection | Nonvolatile lock activated via JEDEC-standard 3-byte sequence; prevents accidental writes during power transitions |
| Hardware write inhibit | Automatic disable of write functions below 3.5 V VCC threshold, ensuring data integrity during brown-out conditions |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing user-configurable I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation. 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 over 27+ years; 150 ns access enables real-time parameter lookup without CPU wait states. |
Use Scenario: Retaining sensor offset/gain coefficients and regulatory audit logs in portable diagnostic equipment with infrequent but mission-critical updates. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration vault with software protection enabled to prevent unauthorized firmware parameter changes. Use Value: 100-year data retention ensures calibration validity across product lifetime; page write capability allows batch update of 128-channel sensor calibrations in <1 s. |
| Point-of-Sale Terminal Settings | Legacy Computer BIOS Parameter Backup |
Use Scenario: Preserving tax rate tables, receipt formatting rules, and merchant ID credentials in retail terminals subject to frequent software updates and power interruptions. IC Role / Device Role / Timing Role: System-critical NVRAM holding volatile setup data that must survive unexpected AC loss or battery depletion. Use Value: Hardware VCC-sense write inhibit prevents corruption during brown-out; 500 µA standby current extends backup battery life in offline mode. |
Use Scenario: Backing up CMOS RAM configuration (date/time, boot order, peripheral enables) in ISA-bus-based industrial PCs where mainboard battery failure is common. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 28C256 EPROMs in socketed DIP-to-PLCC adapter designs, retaining identical timing and control logic. Use Value: Pin-compatible with legacy 28-pin DIP footprint via PLCC-32 adapter; eliminates need for PCB redesign while upgrading to reprogrammable EEPROM. |
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, 100k endurance, same 5V operation but uses different software protection algorithm | Requires PCB footprint change; lacks PLCC-32 package; no Toggle bit polling (only DATA polling) | Preferred for through-hole prototyping or legacy DIP-based designs where board space permits larger package |
| M95256-DW DW | SO-8 SPI interface, 5 ms write cycle, 400 kHz clock, 100k endurance, 5V tolerant but not 5V-native | Serial interface reduces pin count but increases CPU overhead; incompatible with parallel bus systems | Select only when migrating to SPI-based architecture or when minimizing board area is prioritized over parallel bus speed |
Compared with AT28C256-15PU and M95256-DW DW, the X28HC256JZ-15T1 delivers deterministic 150 ns parallel access, native 5V operation without level-shifting, and dual-status polling-making it optimal for real-time industrial controllers where bus timing predictability and legacy compatibility are mandatory.
Availability
X28HC256JZ-15T1 is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and point-of-sale terminals requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
Supply support for X28HC256JZ-15T1 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 semiconductor manufacturer specializing in precision analog and power management ICs for industrial, infrastructure, and high-end consumer markets.
The X28HC256JZ-15T1 belongs to Intersil's second-generation CMOS EEPROM product line, designed specifically for reliable, 5V-only nonvolatile storage in cost-sensitive, long-lifecycle embedded systems where pin compatibility and JEDEC-standard software protection are essential.
FAQ
What is the maximum operating temperature range for the X28HC256JZ-15T1?
The X28HC256JZ-15T1 is rated for commercial operation from 0°C to +70°C. It is not specified for industrial temperature range (–40°C to +85°C); that rating applies only to variants marked with "I" suffix (e.g., X28HC256JI-15). Exceeding +70°C may compromise write endurance and data retention guarantees.
Does the X28HC256JZ-15T1 require external high-voltage circuitry for programming?
No. The X28HC256JZ-15T1 operates with a single 5V supply and uses Intersil's Direct Write™ cell technology, eliminating the need for external VPP programming voltages, charge pumps, or high-voltage generators. All write operations-including page writes-are fully self-timed and internally managed.
How does software data protection work on the X28HC256JZ-15T1?
Software data protection on the X28HC256JZ-15T1 is activated by writing three specific values (0xAA, 0x55, 0xAA) to addresses 0x5555, 0x2AAA, and 0x5555 in sequence. Once set, the X28HC256JZ-15T1 remains write-protected across power cycles until the six-step reset sequence is executed. The protection state is nonvolatile and retained indefinitely.
Can the X28HC256JZ-15T1 be used as a drop-in replacement for older 28C256 EPROMs?
The X28HC256JZ-15T1 is functionally compatible with 28C256 EPROMs in read mode and shares identical pinouts for address, data, and control signals-but it is not a true drop-in replacement due to differences in write enable behavior and lack of UV-erasability. It requires design validation for write-cycle timing and software protection initialization in legacy systems.
What is the purpose of the Toggle bit (I/O6) on the X28HC256JZ-15T1?
The Toggle bit (I/O6) on the X28HC256JZ-15T1 toggles between HIGH and LOW on successive reads during an active internal write cycle. When toggling stops, the write is complete. This mechanism eliminates the need to store and re-read the last written address/data for polling, simplifying firmware implementation-especially in multi-device memory arrays.
X28HC256JZ-15T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 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-15T1 FAQ
1.How can I place an order for X28HC256JZ-15T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for X28HC256JZ-15T1 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-15T1 reliable?
The price and inventory of X28HC256JZ-15T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X28HC256JZ-15T1 is usually 5 days.
3.What payment methods are accepted for X28HC256JZ-15T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X28HC256JZ-15T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X28HC256JZ-15T1?
X28HC256JZ-15T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X28HC256JZ-15T1 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-15T1?
For technical support, including X28HC256JZ-15T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X28HC256JZ-15T1 requirements.
6.How does Aetrix verify that X28HC256JZ-15T1 is sourced from the original manufacturer or authorized distributors?
All X28HC256JZ-15T1 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-15T1 meets industry standards.
7.What is the process for return or replacement of X28HC256JZ-15T1?
All X28HC256JZ-15T1 units undergo pre-shipment inspection (PSI). If there is an issue with X28HC256JZ-15T1, 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-15T1 part is unused and in its original packaging.
Return procedure for X28HC256JZ-15T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
X28HC256JZ-15T1 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
