Microchip Technology AT28LV010-20JU

Overview

AT28LV010-20JU from Atmel is a 1 Mbit (128K × 8) low-voltage paged parallel EEPROM with JEDEC-standard byte-wide pinout, 200 ns read access time, and single 3.3V ± 5% supply operation. It supports automatic 1–128-byte page writes with internal latching and timer control, and delivers 15 mA active current and 20 µA CMOS standby current for industrial embedded memory applications.

For engineers reviewing the AT28LV010-20JU datasheet, AT28LV010-20JU pinout, AT28LV010-20JU application, or AT28LV010-20JU equivalent, key selection criteria include its 3.3V-only operation, hardware/software data protection, DATA polling and toggle-bit write completion detection, and PLCC-32 industrial-grade packaging.

Technical Context

The AT28LV010-20JU operates as a drop-in SRAM-compatible nonvolatile memory: reads require CE and OE low with WE high; writes initiate only after a three-byte Software Data Protection (SDP) command sequence. Its internal 128-byte page register latches address and data on falling WE/CE edges, enabling bus release during internal programming.

Write completion is verified via I/O7 DATA polling (complement-to-data then true data) or I/O6 toggle-bit behavior-both detectable at any time during the ≤10 ms page write cycle. Hardware protection includes VCC power-on delay (~5 ms), noise filtering (<15 ns pulses rejected), and write inhibit via CE high, OE low, or WE high.

Key Specifications

Pinout & Package

AT28LV010-20JU is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), JEDEC MS-016 compliant, with 1.27 mm pitch and 12.32 mm × 14.86 mm footprint. Pin 1 identifier is a corner notch; package is Pb/halide-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28LV010-20JU, AT28C010-20JU trades 3.3V operation and enhanced data protection for broader 5V ecosystem compatibility, while MN63F1002BGP sacrifices parallel bus simplicity for compact serial integration - neither offers direct pin or timing equivalence.

Availability

AT28LV010-20JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and green packaging compliance.

Supply support for AT28LV010-20JU 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

Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.

The AT28LV010 belongs to Atmel's low-voltage paged parallel EEPROM product line, designed specifically to replace 5V EPROMs and early EEPROMs in 3.3V embedded systems while maintaining SRAM-like ease of interface and JEDEC pin compatibility.

FAQ

What is the minimum VCC voltage required for reliable operation of the AT28LV010-20JU?

The AT28LV010-20JU requires a VCC supply of 3.3V ± 5%, meaning the valid operating range is 3.135V to 3.465V. Operation below 3.135V may cause failed write cycles or DATA polling misreads due to insufficient internal charge pump voltage. The device incorporates a VCC power-on delay that blocks writes until VCC exceeds ~2.0V, but full specification compliance demands adherence to the ±5% tolerance band specified for the -20 speed grade.

Does the AT28LV010-20JU support true byte-write operations, or is it page-only?

The AT28LV010-20JU supports both single-byte and 1–128-byte page writes. While it features an internal 128-byte page register optimized for burst loading, the device allows individual byte writes by asserting the correct A0–A6 address bits within a page and issuing the SDP command sequence. Each byte write still consumes one full write cycle (≤10 ms), so page writes are strongly preferred for efficiency - but byte-level granularity remains fully functional and electrically supported.

How is write completion detected on the AT28LV010-20JU without using polling delays?

The AT28LV010-20JU provides two hardware-confirmed methods: DATA polling on I/O7 (reading the last written byte returns its complement until completion, then true data) and toggle-bit detection on I/O6 (repeated reads cause I/O6 to alternate between 0 and 1 until the write finishes, then stabilize). Both methods are asynchronous, require no fixed timing assumptions, and can be initiated at any point during the ≤10 ms internal write cycle - eliminating software delays and improving system responsiveness.

Is the AT28LV010-20JU pin-compatible with standard 27C512 EPROMs?

Yes - the AT28LV010-20JU uses a JEDEC-approved byte-wide pinout identical to 27C512 EPROMs in PLCC-32 and TSOP-32 packages. Address lines A0–A15, data lines I/O0–I/O7, and control signals CE, OE, and WE map directly. However, unlike EPROMs, it requires a 3.3V supply and SDP command sequence for writes, and lacks UV-erase capability - making it a functional and physical drop-in replacement for read-intensive applications with added in-system programmability.

What happens if the SDP command sequence is omitted during a write attempt to the AT28LV010-20JU?

If the three-byte SDP command sequence (AAh to address 5555h, 55h to 2AAAh, A0h to 5555h) is omitted, the AT28LV010-20JU will not execute the write. Instead, internal timers activate for duration tWC (≤10 ms), during which read operations return polling responses rather than valid data. No memory location is altered, and the device remains fully functional afterward - this fail-safe behavior prevents accidental writes during power glitches or software errors, preserving data integrity across all 128K words.