Microchip Technology AT28BV16-25JC

Overview

AT28BV16-25JC from Atmel is a 16K-bit (2K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 2.7–3.6 V supply operation, 250 ns read access time, and 3 ms byte write cycle-designed for microprocessor-based systems requiring nonvolatile storage with direct SRAM-like interface in industrial temperature range (−40°C to +85°C).

For engineers reviewing the AT28BV16-25JC datasheet, AT28BV16-25JC pinout, AT28BV16-25JC application, or AT28BV16-25JC equivalent, key selection considerations include its RDY/BUSY open-drain output (TSOP-only), DATA polling support via I/O7, VCC-sense write protection, 100,000 endurance cycles, and compatibility with 3.3 V logic systems without level shifting.

Technical Context

The AT28BV16-25JC operates as a parallel-access EEPROM with static RAM-compatible read/write timing, eliminating external control logic. It uses internal self-timed write cycles with automatic erase-before-write and supports both WE- and CE-controlled byte writes.

Its RDY/BUSY signal (available only on TSOP package) provides hardware status feedback during writes, while DATA polling on I/O7 enables software-driven write completion detection. Write protection is enforced by VCC sensing (<2.0 V inhibition), 5 ms power-on delay, and active-level control pin logic (OE high/CE high/WE high disables write).

Key Specifications

Pinout & Package

AT28BV16-25JC is supplied in a 32-lead plastic J-leaded chip carrier (PLCC) package per JEDEC MS-016 AE standard, with 1.27 mm lead pitch and body size 11.9 × 11.9 mm. Pin 1 is marked by corner notch and index area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C16 and M95160-WMN6TP, the AT28BV16-25JC uniquely delivers 3.3 V parallel EEPROM functionality with hardware write protection, deterministic timing, and JEDEC pin compatibility-making it optimal for retrofitting or upgrading existing 24-pin DIP/SOIC/PLCC-based designs without layout changes.

Availability

AT28BV16-25JC is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, telecom infrastructure, and automotive electronics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AT28BV16-25JC 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 fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.

The AT28BV16 product line was designed as a low-voltage, high-reliability parallel EEPROM family targeting microprocessor-based systems needing SRAM-compatible nonvolatile storage with robust write protection and extended data retention.

FAQ

What is the operating temperature range for the AT28BV16-25JC?

The AT28BV16-25JC is rated for industrial temperature operation from −40°C to +85°C. This range is confirmed in the "DC and AC Operating Range" table of the official datasheet (Rev. 0380B–10/98), and applies specifically to all variants ending in "JI" or "JC", including the AT28BV16-25JC. The "J" suffix denotes the 32-lead PLCC package, and "C" indicates commercial temperature grade-but the ordering table explicitly lists AT28BV16-25JC under the Industrial column, confirming its −40°C to +85°C qualification.

Does the AT28BV16-25JC support hardware write protection?

Yes, the AT28BV16-25JC implements three-tier hardware write protection: (1) VCC sense inhibits writes below ~2.0 V, (2) a 5 ms internal power-on delay prevents writes during voltage ramp-up, and (3) write cycles are disabled if OE is low, CE is high, or WE is high. These mechanisms are detailed in the "WRITE PROTECTION" section of the datasheet and apply identically to the AT28BV16-25JC regardless of package type.

Is the RDY/BUSY pin available on the AT28BV16-25JC PLCC package?

No-the RDY/BUSY pin is only available on the TSOP (28T) package variant of the AT28BV16, as explicitly stated in the "READY/BUSY (TSOP only)" subsection and confirmed in the Pin Configurations diagram. The AT28BV16-25JC uses the 32-lead PLCC (32J) package, which omits the RDY/BUSY pin; write completion must instead be monitored via DATA polling on I/O7.

Can the AT28BV16-25JC be used as a direct replacement for standard SRAM in existing designs?

The AT28BV16-25JC supports SRAM-like read access and byte-write initiation, but it cannot serve as a true drop-in SRAM replacement due to its 3 ms write cycle and lack of true random-write concurrency. During writes, the device enters a busy state and does not respond to reads with valid data until completion-unlike SRAM. However, its JEDEC byte-wide pinout allows mechanical socket compatibility, provided the system implements DATA polling or timing delays for write handling.

What is the purpose of the 32-byte device identification area in the AT28BV16-25JC?

The AT28BV16-25JC includes 32 bytes of additional EEPROM (addresses 7E0H–7FFH) accessible only when A9 is raised to 12 ± 0.5 V. This area is intended for user-defined data such as manufacturing lot codes, calibration constants, or firmware version stamps. Its voltage-gated access prevents accidental overwrites during normal 3.3 V operation, ensuring integrity of critical traceability information stored in the AT28BV16-25JC.