Renesas X28HC64JZ-12

Overview

X28HC64JZ-12 from Intersil is a 64 kbit (8k × 8), 5 V-only, byte-alterable EEPROM with JEDEC-standard byte-wide pinout, 120 ns access time, and RoHS-compliant 32-lead PLCC package. It supports 64-byte page writes (0.25 s full memory write), DATA polling and Toggle Bit end-of-write detection, and software/hardware data protection - deployed in industrial control panels for nonvolatile parameter storage across power cycles.

For engineers reviewing the X28HC64JZ-12 datasheet, X28HC64JZ-12 pinout, X28HC64JZ-12 application, or X28HC64JZ-12 equivalent, key selection considerations include its 120 ns read timing, -40°C to +85°C industrial temperature range compatibility, 100,000 write endurance, 100-year data retention, and PLCC package thermal resistance (θ_JA = 41°C/W).

Technical Context

The X28HC64JZ-12 implements a floating-gate CMOS EEPROM array with dual-line control architecture (CE/OE/WE), enabling bus contention-free reads and CE- or WE-triggered writes. Its internal timing logic latches address on the later falling edge of CE or WE and data on the earlier rising edge, supporting self-timed byte and page programming without external high-voltage circuitry.

It integrates two independent write-status mechanisms: DATA Polling (I/O7 complement behavior) and Toggle Bit (I/O6 state alternation), both compliant with JEDEC-standard read-cycle timing. Software data protection is implemented via a nonvolatile 3-byte unlock sequence (0x555/0x2AA/0x555), which persists until explicitly reset.

Key Specifications

Pinout & Package

Package: 32-lead Plastic Leaded Chip Carrier (PLCC), RoHS-compliant, JEDEC MS-016AE (N32.45x55), θ_JA = 41°C/W, θ_JC = 19°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EEPROM applications.

Compared with AT28C64B-15PU and FM24CL64-G, the X28HC64JZ-12 uniquely balances 120 ns speed, 100,000-cycle endurance, 5 V operation, and 32-pin PLCC compatibility - making it the only viable option for retrofitting legacy industrial controllers requiring JEDEC-standard pinout and RoHS compliance without PCB redesign.

Availability

X28HC64JZ-12 is available at Aetrix Electronics and suitable for industrial control panels, medical device calibration storage, and point-of-sale terminal applications requiring stable component supply, long-lifecycle support, and RoHS-compliant PLCC packaging.

Supply support for X28HC64JZ-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 semiconductor innovator specializing in precision analog and power management ICs for industrial, infrastructure, and high-end consumer markets.

The X28HC64 product line was designed for reliable, low-power, byte-alterable nonvolatile storage in 5 V embedded systems where pin compatibility with standard memories and long-term data integrity are critical.

FAQ

What is the maximum operating temperature range for the X28HC64JZ-12?

The X28HC64JZ-12 is rated for 0°C to +70°C operation. This commercial temperature grade is specified in the Ordering Information table of FN8109 Rev 4.00 and validated across all AC and DC electrical parameters. For extended-range alternatives, consider X28HC64JIZ-12 (-40°C to +85°C), which shares identical functionality but differs in temperature qualification and part marking.

Does the X28HC64JZ-12 require external high-voltage programming circuitry?

No. The X28HC64JZ-12 operates from a single 5 V supply and contains fully integrated charge pumps for internal programming voltage generation. As confirmed in the datasheet Features section and Device Operation chapter, no external high-voltage sources, VP-P controls, or complex algorithms are needed - simplifying design and reducing BOM cost versus older EEPROM families.

How does the software data protection feature work on the X28HC64JZ-12?

The X28HC64JZ-12 implements software data protection via a nonvolatile 3-byte unlock sequence (0x555/0x2AA/0x555) that must precede any write operation once enabled. As detailed in Figures 7–10 of FN8109 Rev 4.00, this feature persists across power cycles and requires explicit deactivation using a six-step reset algorithm - ensuring robust protection against accidental writes in powered or unpowered states.

Can the X28HC64JZ-12 be used in place of faster 70 ns or 90 ns variants?

Yes, the X28HC64JZ-12 is functionally and pin-compatible with X28HC64JZ-70 and X28HC64JZ-90, differing only in guaranteed access time (120 ns vs. 70/90 ns). System timing margins must accommodate the slower read cycle; however, all write functionality, pinout, voltage, and software features remain identical - enabling drop-in replacement where timing budgets allow.

What package type and lead count does the X28HC64JZ-12 use?

The X28HC64JZ-12 uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, RoHS-compliant, per JEDEC MS-016AE (drawing N32.45x55). This is explicitly stated in the Ordering Information table on page 2 of FN8109 Rev 4.00 and confirmed by the top-view pin diagram on page 1. Pins 3, 13, 29, and 30 are NC and must remain unconnected.