Microchip Technology AT28BV16-30PC

Overview

AT28BV16-30PC from Atmel is a 16K (2,048 × 8) parallel EEPROM with 2.7–3.6 V supply, 300 ns read access time, 3 ms byte write time, and JEDEC-approved byte-wide pinout. It operates as a drop-in nonvolatile memory replacement for SRAM in microprocessor systems requiring battery-voltage compatibility and industrial temperature support (–40°C to +85°C).

For engineers reviewing the AT28BV16-30PC datasheet, AT28BV16-30PC pinout, AT28BV16-30PC application, or AT28BV16-30PC equivalent, key selection considerations include its CMOS standby current (≤50 µA), DATA polling and RDY/BUSY signaling for write cycle detection, direct microprocessor control without external timing logic, and dual-line CE/OE bus contention prevention.

Technical Context

The AT28BV16-30PC implements a parallel interface with asynchronous read/write operation, latching internal address and data during byte write cycles to free the microprocessor bus. Its architecture supports static RAM-like access timing while embedding self-timed erase-and-write logic with internal control timer.

It features VCC-sense write protection, 5 ms power-on delay before write enable, and three-layer write inhibition (OE low, CE high, or WE high). An extra 32-byte identification EEPROM is accessible via A9 = 12 ± 0.5 V at addresses 7E0H–7FFH.

Key Specifications

Pinout & Package

AT28BV16-30PC is supplied in a 24-lead, 0.600" wide plastic DIP (PDIP) package per JEDEC MS-011 AA standard, with through-hole mounting and 2.54 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C16 and MN63F1002, the AT28BV16-30PC uniquely balances 3.3 V compatibility, parallel bus speed, and integrated write safety-making it optimal for upgrading SRAM-based systems where pin count, timing, and power domain alignment are critical.

Availability

AT28BV16-30PC is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, point-of-sale terminals, and telecom line cards requiring stable component supply, long-life data retention, and drop-in parallel EEPROM replacement capability.

Supply support for AT28BV16-30PC 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.

The AT28BV16 product line delivers low-voltage, high-reliability parallel EEPROMs designed for direct integration into microprocessor-based systems needing robust, pin-compatible alternatives to EPROM and battery-backed SRAM.

FAQ

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

The AT28BV16-30PC is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table of the official datasheet, where the "-30" speed grade and "PI/PC" suffixes denote industrial and commercial variants respectively-both sharing identical thermal limits. The AT28BV16-30PC specifically carries the "PC" suffix, indicating commercial temperature range (0°C to +70°C), not industrial. Therefore, its maximum operating temperature is +70°C.

Does the AT28BV16-30PC include a READY/BUSY pin?

No, the AT28BV16-30PC does not include a READY/BUSY pin. That function is exclusive to the TSOP package variant (e.g., AT28BV16-30TC). The "PC" suffix denotes a 24-lead PDIP package, which omits the RDY/BUSY pin. Instead, the AT28BV16-30PC relies solely on DATA polling via I/O7 to detect write completion-a software-managed alternative that requires no additional hardware connection.

Can the AT28BV16-30PC be used as a direct replacement for a 27C256 EPROM?

The AT28BV16-30PC is not a direct replacement for the 27C256 EPROM due to fundamental differences: the 27C256 is a 32K × 8 UV-erasable EPROM requiring +12.5 V programming voltage and UV erasure, whereas the AT28BV16-30PC is a 16K × 8 electrically erasable EEPROM operating at 2.7–3.6 V with no high-voltage requirement. While both share JEDEC byte-wide pinouts, the AT28BV16-30PC has different timing, write protocols, and smaller capacity-requiring firmware and hardware validation before substitution.

What is the purpose of the 32-byte ID memory in the AT28BV16-30PC?

The AT28BV16-30PC includes 32 bytes of additional EEPROM space (addresses 7E0H–7FFH) reserved for user-defined device identification. Access requires raising A9 to 12 ± 0.5 V-activating a special mode distinct from normal operation. This area is commonly used to store unique serial numbers, calibration coefficients, manufacturing date codes, or firmware version stamps-enabling traceability and field service without consuming main array memory.

How does write protection work on the AT28BV16-30PC?

Write protection on the AT28BV16-30PC operates through three independent mechanisms: (1) VCC sense-writes disabled when VCC falls below ~2.0 V; (2) Power-on delay-5 ms internal timeout after VCC reaches 2.0 V before writes are allowed; and (3) Signal-level inhibition-holding OE low, CE high, or WE high blocks all byte write cycles. These features prevent accidental writes during power transitions or software glitches, ensuring data integrity without external hardware supervision.