Renesas X28HC64P-12

Overview

X28HC64P-12 from Intersil is a 64 kbit (8k × 8) parallel-interface EEPROM with 120 ns read access time, single 5 V supply operation, and JEDEC-standard byte-wide pinout. It supports byte and 64-byte page write modes, delivers 100,000 write cycles endurance, and retains data for over 100 years. Used in industrial control panels for parameter storage and firmware revision tracking.

For engineers reviewing the X28HC64P-12 datasheet, X28HC64P-12 pinout, X28HC64P-12 application, or X28HC64P-12 equivalent, key selection criteria include 28-pin PDIP RoHS-compliant packaging, hardware/software data protection, DATA Polling and Toggle Bit end-of-write detection, and compatibility with legacy 5 V memory buses requiring no external high-voltage programming circuitry.

Technical Context

The X28HC64P-12 implements a floating-gate CMOS nonvolatile memory array with dual-line control architecture (CE/OE/WE), enabling bus contention-free reads and deterministic write initiation via either CE- or WE-controlled timing. Its internal self-timed write logic eliminates need for external timing control.

It features two independent end-of-write detection mechanisms-DATA Polling on I/O7 and Toggle Bit on I/O6-both accessible during active read cycles without interrupt overhead. The device includes default VCC sense and write-inhibit logic to prevent spurious writes during power transitions.

Key Specifications

Pinout & Package

Package: 28-lead PDIP (Plastic Dual In-line Package), RoHS-compliant, 0.6-inch width, E28.6 package drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C64B-15PU, X28HC64P-12 offers 10× higher endurance and tighter 120 ns timing; versus MX28LV640CT-12P, it avoids 3.3 V interface constraints while maintaining identical timing and endurance-ideal for pure 5 V legacy systems.

Availability

X28HC64P-12 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, telecom infrastructure, and automotive body electronics requiring stable component supply across multi-year production cycles.

Supply support for X28HC64P-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 pioneer in high-reliability analog and nonvolatile memory solutions, specializing in industrial-grade power management and precision timing products.

The X28HC64 product line was engineered for mission-critical 5 V embedded systems requiring guaranteed data integrity, long-term retention, and seamless integration into legacy memory buses without redesign.

FAQ

What is the operating temperature range for the X28HC64P-12?

The X28HC64P-12 is rated for commercial temperature operation from 0°C to +70°C. Its 28-pin PDIP package (E28.6) is RoHS-compliant and qualified for use in industrial environments where ambient temperatures remain within this range. The device maintains full specification compliance-including 120 ns access time and 100,000-cycle endurance-across this interval. X28HC64P-12 does not support extended industrial (-40°C to +85°C) operation; that range applies only to variants marked with "I" (e.g., X28HC64PIZ-12).

Does the X28HC64P-12 require external high-voltage programming circuitry?

No, the X28HC64P-12 operates from a single 5 V supply and requires no external high-voltage programming circuitry. Its internal floating-gate CMOS technology enables byte and page writes using only standard TTL-level CE, OE, and WE control signals. All write timing-including 2 ms typical cycle duration-is self-timed, eliminating need for external clocks, erase pulses, or complex algorithms. This simplifies board design and reduces BOM count compared to older EPROM or UV-erasable devices.

How does software data protection work on the X28HC64P-12?

Software data protection on the X28HC64P-12 is enabled via a nonvolatile 3-byte command sequence written to specific addresses (0x5555, 0x2AAA, 0x5555). Once activated, the X28HC64P-12 remains write-protected until the six-step deactivation sequence is issued. Protection persists through power cycles and prevents accidental writes during power-up/down. The X28HC64P-12 ships with this feature disabled, allowing immediate read/write access upon first power-up.

Can the X28HC64P-12 be used in place of a standard SRAM in an existing design?

Yes-the X28HC64P-12 uses the JEDEC-approved pinout for byte-wide memories and is electrically compatible with standard 8k × 8 SRAMs in read mode. However, write operations require explicit WE/CE/OE handshaking and 2 ms internal timing, unlike SRAM's instantaneous writes. Designs must implement polling (DATA Polling on I/O7 or Toggle Bit on I/O6) or fixed delays to detect write completion. No PCB changes are needed for pin layout, but firmware must accommodate non-volatile write semantics.

What package type is used for the X28HC64P-12?

The X28HC64P-12 uses a 28-lead plastic dual in-line package (PDIP) with 0.6-inch width, per package drawing E28.6. It is RoHS-compliant and intended for through-hole wave solder assembly only-not reflow soldering. The package includes two NC (no-connect) pins (Pin 1 and Pin 28) and supports standard 5 V logic levels. Thermal resistance is θJA = 53°C/W, requiring appropriate board-level thermal management in high-density layouts.