Microchip Technology AT49LV1024-70VC

Overview

AT49LV1024-70VC from Microchip Technology (formerly Atmel) is a 1-Mbit (64K × 16) 3.0–3.6 V single-voltage Flash memory IC used for nonvolatile code/data storage in embedded microcontroller systems. It delivers 70 ns read access time, supports word-by-word programming (20 µs/word), includes an 8K-word boot block with optional hardware lockout, and operates across 0°C to 70°C in a 40-pin VSOP package.

For engineers reviewing the AT49LV1024-70VC datasheet, AT49LV1024-70VC pinout, AT49LV1024-70VC application, or AT49LV1024-70VC equivalent, key selection considerations include boot-sector protection capability, 3V-only in-system reprogrammability, fast erase (10 s chip erase), hardware data protection (VCC sense, noise filtering), and compatibility with standard EPROM read timing interfaces.

Technical Context

The AT49LV1024-70VC implements a dual-block Flash architecture: 56K words main memory and an 8K-word boot block (0000H–1FFFH) with optional permanent write lockout. Programming and erase operations are executed via command sequences written to specific address/data latches (e.g., 5555H/AA, 2AAAH/55), eliminating need for external high-voltage generators.

It features two end-of-operation detection methods-Data Polling (I/O7 complement toggle) and Toggle Bit (I/O6 toggling)-enabling host software to synchronize without fixed timing delays. Hardware protections include VCC sense (<1.8 V inhibits programming), CE/OE/WE logic gating, and 15 ns noise filtering on control inputs.

Key Specifications

Pinout & Package

AT49LV1024-70VC uses a 40-pin Very Small Outline Package (VSOP), 10 mm × 14 mm body, JEDEC-standard thin profile suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Flash memory applications.

Compared with SST39VF100A-70-4C-NHE and MX29LV102CTTI-70G, the AT49LV1024-70VC uniquely combines 40-pin VSOP compactness, hardware boot block lockout, and integrated VCC-sense programming inhibition - critical for space-constrained, safety-aware embedded systems requiring tamper-resistant firmware storage.

Availability

AT49LV1024-70VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, network router boot code, and medical diagnostic equipment UI requiring stable component supply, long-lifecycle support, and verified Flash endurance.

Supply support for AT49LV1024-70VC 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

Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel Flash products including the AT49LV1024 series.

The AT49LV1024 product line was designed for cost-sensitive, space-constrained embedded systems requiring reliable in-system reprogrammability without high-voltage programming infrastructure.

FAQ

What is the pin count and package type of the AT49LV1024-70VC?

The AT49LV1024-70VC uses a 40-pin Very Small Outline Package (VSOP) measuring 10 mm × 14 mm. This thin, surface-mount package features gull-wing leads and is optimized for high-density PCB layouts. Pin assignments include 16 address lines (A0–A15), 16 bidirectional data lines (I/O0–I/O15), three control signals (CE, OE, WE), one power supply (VCC), two ground connections (GND), and six no-connect (NC) terminals - all confirmed in the official Atmel datasheet revision 1278D.

Does the AT49LV1024-70VC support in-system programming without external high voltage?

Yes, the AT49LV1024-70VC supports full in-system programming using only its 3.0–3.6 V VCC supply - no external VPP or high-voltage generator is required. Programming is initiated via six-cycle command sequences (e.g., 5555H/AA → 2AAAH/55 → 5555H/A0) written to the address/data bus. The AT49LV1024-70VC integrates internal charge pumps and timing logic to generate necessary programming voltages, enabling field firmware updates directly through the host processor's memory-mapped interface.

How does the boot block lockout feature work on the AT49LV1024-70VC?

The AT49LV1024-70VC includes an 8K-word boot block (addresses 0000H–1FFFH) with optional hardware lockout. Once enabled via a six-cycle command sequence (5555H/AA → 2AAAH/55 → 5555H/80 → 5555H/AA → 2AAAH/55 → 5555H/40), the boot block becomes permanently read-only: erasure and programming are disabled. The AT49LV1024-70VC provides software detection - reading address 0002H returns I/O0 = high if lockout is active - ensuring bootloader integrity in safety-critical applications.

What are the key timing parameters for read and write operations on the AT49LV1024-70VC?

The AT49LV1024-70VC specifies 70 ns maximum address-to-output delay (tACC) and CE-to-output delay (tCE), with 35 ns OE-to-output delay (tOE). For programming, it guarantees 20 µs typical word programming time (tBP) and 70 ns minimum write pulse width (tWP). Erase cycles require 10 seconds typical for full chip erase. All parameters are validated across 0°C to 70°C and 3.0–3.6 V VCC, ensuring predictable timing behavior in commercial-temperature embedded systems using the AT49LV1024-70VC.

Is the AT49LV1024-70VC pin-compatible with other members of the AT49LV1024/1025 family?

The AT49LV1024-70VC is pin-compatible with other AT49LV1024 variants (e.g., -55VC, -90VC, -90VI) sharing the 40-pin VSOP package. However, it is not pin-compatible with AT49LV1025 variants (e.g., AT49LV1025-70JC), which use a 44-pin PLCC package. Electrical specifications and command sets are identical across the AT49LV1024/1025 family, but physical layout, thermal characteristics, and board-level routing differ significantly between VSOP and PLCC packages - requiring separate PCB designs for each.