Renesas X28HC64SIZ-70

Overview

X28HC64SIZ-70 from Intersil is a 64 kbit (8k × 8) parallel-interface EEPROM with 70 ns access time, operating from a single 5 V supply. It features byte- and page-write capability (64-byte pages), DATA Polling and Toggle Bit end-of-write detection, and hardware/software data protection. It is used in industrial control systems for nonvolatile parameter storage requiring long-term reliability and write endurance.

For engineers reviewing the X28HC64SIZ-70 datasheet, X28HC64SIZ-70 pinout, X28HC64SIZ-70 application, or X28HC64SIZ-70 equivalent, key selection considerations include its -40°C to +85°C industrial temperature range, 28-pin SOIC (300 mil) RoHS-compliant package, JEDEC-standard byte-wide memory pinout, and support for self-timed 2 ms typical byte/page write cycles without external high-voltage programming.

Technical Context

The X28HC64SIZ-70 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 timing logic latches address on the later falling edge of CE or WE and data on the earlier rising edge, enabling flexible host interface timing.

It integrates floating-gate CMOS nonvolatile memory cells with default VCC-sense and write-inhibit hardware protection, plus a nonvolatile software data protection mode activated via a 3-byte unlock sequence. Endurance is rated at 100,000 write cycles with >100 years data retention.

Key Specifications

Pinout & Package

Package: 28-pin SOIC (300 mil), RoHS-compliant, JEDEC MS-013-AE compliant, M28.3 package drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C64B-15PU, X28HC64SIZ-70 delivers 2× faster access, 10× higher endurance, and page-write acceleration; versus MX28LV640BTC-70G, it avoids 3.3 V supply complexity but lacks voltage flexibility-making it optimal for pure 5 V industrial platforms.

Availability

X28HC64SIZ-70 is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, automotive body electronics, and telecom power supply applications requiring stable component supply across extended product lifecycles.

Supply support for X28HC64SIZ-70 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 U.S.-based semiconductor company specializing in power management and precision analog ICs, acquired by Renesas Electronics in 2017.

The X28HC64 product line was designed for industrial and automotive systems needing robust, pin-compatible EEPROM replacements for legacy EPROM/SRAM sockets, with emphasis on write reliability, long data retention, and simplified 5 V-only system integration.

FAQ

What is the operating temperature range of the X28HC64SIZ-70?

The X28HC64SIZ-70 is specified for industrial operation from -40°C to +85°C. This range is confirmed in the Ordering Information table (Page 2) and Absolute Maximum Ratings section (Page 9) of the FN8109 datasheet. It is distinct from commercial-grade variants like X28HC64SZ-70 (0°C to +70°C) and ensures reliable performance in harsh environments such as factory floors or outdoor enclosures. The X28HC64SIZ-70 maintains full 70 ns access time and 2 ms write timing across this entire range.

Does the X28HC64SIZ-70 require external high-voltage programming circuitry?

No, the X28HC64SIZ-70 operates from a single 5 V supply with no external high voltages required. Its internal charge pump generates all necessary programming voltages, as stated in the Features list (Page 1) and Device Operation section (Page 3). This eliminates the need for VP-P control circuits or complex programming algorithms-unlike older EPROMs-and enables direct connection to standard 5 V microcontroller buses. The X28HC64SIZ-70 is fully self-timed during writes.

How does the page write function work on the X28HC64SIZ-70?

The X28HC64SIZ-70 supports 64-byte page writes, allowing up to 64 consecutive bytes to be loaded before initiating the internal programming cycle. Each subsequent byte must be written within 100 µs of the prior WE pulse (tBLC, Page 12), and the A6–A12 address bits must remain constant across the page. Once the final byte is loaded, the device automatically begins programming, completing the entire page in ~2 ms. This capability is documented in the Page Write Operation section (Page 3) and Figure 17 (Page 13) of the datasheet.

What methods does the X28HC64SIZ-70 provide for detecting write completion?

The X28HC64SIZ-70 provides two hardware-supported methods: DATA Polling (monitoring I/O7 for data complement) and Toggle Bit polling (monitoring I/O6 for state alternation). Both are detailed in Figures 2, 4, 5, and 6 (Pages 4–5) and enable host software to avoid fixed delays. DATA Polling requires saving the last address and data; Toggle Bit does not. These mechanisms are integral to the X28HC64SIZ-70's real-time write status feedback and are validated across its full temperature and voltage range.

Is the X28HC64SIZ-70 RoHS compliant and what package does it use?

Yes, the X28HC64SIZ-70 is RoHS compliant and packaged in a 28-pin SOIC (300 mil) with matte tin (e3) termination, as explicitly stated in the Ordering Information table (Page 2, Note 4) and Package Drawing M28.3 (Page 17). It meets IPC/JEDEC J-STD-020 moisture sensitivity level requirements and is qualified for standard reflow soldering. The "Z" suffix in the part number denotes Pb-free compliance, and the "SI" prefix identifies the SOIC package variant.