Microchip Technology AT28BV16-30JI

Overview

AT28BV16-30JI from Atmel is a 16 Kbit (2,048 × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 300 ns read access time, 2.7–3.6 V supply operation, and industrial temperature range (−40°C to +85°C). It supports direct microprocessor control via CE/OE/WE, DATA polling, and RDY/BUSY signaling in TSOP package - used in embedded system configuration storage and firmware parameter retention.

For engineers reviewing the AT28BV16-30JI datasheet, AT28BV16-30JI pinout, AT28BV16-30JI application, or AT28BV16-30JI equivalent, key selection considerations include its 300 ns read timing, 3 ms byte-write cycle, CMOS standby current (≤50 µA), and industrial-grade reliability (100,000 write cycles, 10-year data retention).

Technical Context

The AT28BV16-30JI operates as a drop-in parallel memory replacement for SRAM-based boot/config interfaces, requiring no external timing logic. Its internal self-timed write cycle eliminates need for external write pulse control, while DATA polling on I/O7 and open-drain RDY/BUSY output provide deterministic write completion detection.

It implements VCC-sense write protection, 5 ms power-on delay, and triple-level write inhibit (CE high / OE low / WE high), ensuring robust immunity to spurious writes during power ramp or noise events. The device includes 32 bytes of dedicated identification EEPROM accessible at 7E0H–7FFH using A9 = 12 V programming.

Key Specifications

Pinout & Package

AT28BV16-30JI is packaged in a 32-lead plastic J-leaded chip carrier (PLCC), compliant with JEDEC MS-016 AE standard. Pin 1 marked with index notch; body dimensions 13.7 mm × 11.9 mm × 3.56 mm (max height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST M28W160ECB90N6 and Microchip 25LC1024-I/P, the AT28BV16-30JI delivers deterministic parallel-interface timing, hardware write-status signaling, and industrial-grade reliability in a pin-compatible PLCC footprint - making it optimal for legacy-maintained or timing-critical embedded systems.

Availability

AT28BV16-30JI is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive body control modules, and networking infrastructure requiring stable component supply across extended product lifecycles.

Supply support for AT28BV16-30JI 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) was a leading designer of nonvolatile memory, microcontrollers, and analog ICs, known for high-reliability industrial and automotive-grade products.

The AT28BV16 series was engineered specifically for embedded systems requiring pin-compatible, low-voltage parallel EEPROM replacement with robust write protection and deterministic status feedback - targeting industrial control, medical instrumentation, and telecom infrastructure.

FAQ

What is the maximum operating temperature range for the AT28BV16-30JI?

The AT28BV16-30JI is rated for industrial temperature operation from −40°C to +85°C. This specification is guaranteed across all electrical parameters including read access time (300 ns), write cycle (3.0 ms), and standby current (≤50 µA). The device undergoes full temperature screening per Atmel's industrial qualification standards, making it suitable for deployment in harsh environments such as factory floors and vehicle engine compartments.

Does the AT28BV16-30JI support hardware write-protection features?

Yes, the AT28BV16-30JI implements three hardware write-protection mechanisms: (1) VCC sense that disables writes below ~2.0 V, (2) automatic 5 ms power-on delay before enabling writes, and (3) triple-level inhibit requiring simultaneous valid CE low, OE high, and WE low. These features prevent accidental writes during power-up, brown-out, or noise-induced glitches - critical for maintaining configuration integrity in unattended systems.

Can the AT28BV16-30JI be used as a direct replacement for older 27C256 EPROMs?

The AT28BV16-30JI shares JEDEC-standard byte-wide pinout with 27C256 EPROMs but differs in voltage, timing, and control logic. While pin-compatible in PLCC-32, it operates at 2.7–3.6 V (vs. 5 V for 27C256) and uses active-low WE instead of OE-controlled write. Direct replacement requires verifying MCU interface voltage levels and updating timing parameters - not a drop-in swap without validation.

How does DATA polling work on the AT28BV16-30JI?

During a byte write, the AT28BV16-30JI returns the complement of the written data on I/O7 while busy; when the write completes, true data appears on all I/O lines. Software polls I/O7 after initiating a write: if the bit toggles, the write is still active; when it stabilizes to the expected value, the operation is complete. This eliminates fixed delays and enables optimal CPU utilization without external hardware timers.

Is RDY/BUSY functionality available on the AT28BV16-30JI PLCC package?

Yes, RDY/BUSY is implemented on the AT28BV16-30JI in PLCC (32J) package as an open-drain output requiring an external pull-up resistor. It is asserted low during internal write operations and released high upon completion. Note that this signal is absent in PDIP and SOIC variants - only TSOP and PLCC packages include RDY/BUSY, per the device's pin configuration diagrams and ordering table.