Microchip Technology AT28LV010-20TU-T

Overview

AT28LV010-20TU-T from Atmel is a 1 Mbit (128K × 8) low-voltage paged parallel EEPROM with JEDEC-standard byte-wide pinout, 200 ns read access time, 10 ms maximum page write cycle, and operation from a single 3.3 V ± 10% supply. It supports 1–128-byte page writes with internal latching and DATA polling for write completion detection, and is qualified for industrial temperature range (−40°C to +85°C).

For engineers reviewing the AT28LV010-20TU-T datasheet, AT28LV010-20TU-T pinout, AT28LV010-20TU-T application, or AT28LV010-20TU-T equivalent, key selection considerations include its 3.3 V-only operation, hardware/software data protection, CMOS standby current of 20 µA, JEDEC-compliant 32-lead TSOP package, and support for automatic page programming without external timing components.

Technical Context

The AT28LV010-20TU-T implements a paged parallel EEPROM architecture with an internal 128-byte page register that latches address and data on falling WE/CE edges, enabling bus release during internal programming. Its software data protection (SDP) requires a three-byte command sequence before every write, and it uses dual-line chip enable (CE) and output enable (OE) control to prevent bus contention during read operations.

Write completion is verified via DATA polling on I/O7 (complement-to-data during programming, true data after completion) or toggle-bit detection on I/O6. The device integrates hardware safeguards including VCC power-on delay (~5 ms), noise filtering (<15 ns pulse rejection), and write-inhibit logic tied to CE/OE/WE states - all active across its full industrial temperature range.

Key Specifications

Pinout & Package

AT28LV010-20TU-T is packaged in a 32-lead Plastic Thin Small Outline Package (TSOP), Type I, 8 mm × 20 mm footprint per JEDEC MO-142 BD, with lead pitch of 0.50 mm and coplanarity ≤ 0.10 mm. Pin 1 identifier is marked by a beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28LV010-20TU-T, AT28C010-15PU offers faster access but sacrifices low-voltage operation and data security, while MX28LV160CBTI-20G provides scalability at the cost of pin compatibility and software effort - making AT28LV010-20TU-T optimal for drop-in 3.3 V upgrades of JEDEC-compliant 1 Mbit EEPROM sockets.

Availability

AT28LV010-20TU-T is available at Aetrix Electronics and suitable for industrial PLCs, medical calibration systems, telecom line cards, and automotive body control modules requiring stable component supply, long-term data retention, and RoHS-compliant green packaging.

Supply support for AT28LV010-20TU-T 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 parallel EEPROM product line, designed specifically to replace obsolete 5 V EPROMs and early EEPROMs in legacy 8-bit systems while delivering enhanced reliability, lower power, and robust write protection.

FAQ

What is the correct power-up sequence for reliable operation of the AT28LV010-20TU-T?

The AT28LV010-20TU-T incorporates an internal VCC power-on delay circuit that automatically inhibits writes until VCC reaches 2.0 V and remains stable for ~5 ms. No external reset sequencing is required. However, CE and WE must remain high (inactive) during power ramp, and OE may be driven after VCC stabilizes. This behavior ensures AT28LV010-20TU-T avoids spurious writes during brown-out or cold-start conditions typical in industrial power supplies.

How does the software data protection (SDP) feature work in the AT28LV010-20TU-T?

The AT28LV010-20TU-T enforces SDP at all times: every write operation must begin with a precise three-byte command sequence written to addresses 5555h, 2AAAh, and 5555h (data AAh, 55h, A0h). Only then will subsequent writes to any address be accepted. If omitted, AT28LV010-20TU-T ignores data and starts internal timers without programming - preventing accidental writes due to noise or firmware errors. This differs from older EEPROMs where SDP could be disabled.

Can the AT28LV010-20TU-T be used as a direct replacement for a 27C010 EPROM?

No - the AT28LV010-20TU-T is not a pin-compatible or functionally equivalent replacement for the 27C010 EPROM. While both are 1 Mbit parallel devices in 32-pin packages, the AT28LV010-20TU-T requires active WE control, supports page writes and SDP, and operates at 3.3 V only. The 27C010 uses 5 V, has no WE pin, and is one-time programmable. Direct substitution would require PCB modifications and firmware updates to handle AT28LV010-20TU-T's write protocol and timing.

What is the significance of the "-20" suffix in AT28LV010-20TU-T?

The "-20" in AT28LV010-20TU-T denotes the maximum read access time specification: 200 ns. This grade guarantees tACC ≤ 200 ns under industrial temperature and voltage conditions (VCC = 3.3 V ± 10%, TA = −40°C to +85°C). It distinguishes the part from the -25 variant (250 ns), ensuring AT28LV010-20TU-T meets tighter timing budgets in high-speed 8-bit bus systems where wait-state elimination is critical.

Does the AT28LV010-20TU-T support byte-level writes without page alignment constraints?

Yes - the AT28LV010-20TU-T supports true byte-level writes: a single byte can be programmed without loading a full 128-byte page. However, for multi-byte writes within the same page (defined by A7–A16), all bytes must be loaded within 150 µs (tBLC) of each other, and A7–A16 must remain constant across WE transitions. Single-byte writes impose no alignment restrictions and use the same SDP command sequence as page writes.