This document introduces the features and characteristics of the AMD company's 5.0 V-only Flash Am29F400AT/Am29F400AB 4 Megabit (524,288 x 8-Bit/262,144 x 16-Bit) CMOS 5.0 Volt-only, Sector Erase Flash Memory
The Am29F400AT/Am29F400AB is a 4 Mbit CMOS flash memory offered in 44‑pin SO and 48‑pin TSOP packages. It operates from a single 5.0 V supply and provides sector‑erase architecture, hardware sector protection, and an erase‑suspend feature. The device supports both 8‑bit and 16‑bit data bus configurations and includes a Ready/Busy output for program/erase status.
The document provides detailed electrical characteristics, timing diagrams, pin configurations, ordering information, and valid product combinations. It also lists latch‑up characteristics, pin capacitance data, and revision‑specific updates for performance and power‑management specifications.
| Memory size | 4 Mbit (524,288 × 8‑bit / 262,144 × 16‑bit) |
|---|---|
| Supply voltage | 5.0 V (single‑supply) |
| Maximum access time | 60 ns |
| Write/erase cycles | Minimum 100,000 cycles |
| Standby current | 1 pA typical |
| Active read current (Byte mode) | 20 mA typical |
| Active read current (Word mode) | 28 mA typical |
| Program/erase current | 30 mA typical |
It provides one 16 KB, two 8 KB, one 32 KB and seven 64 KB sectors, and any combination of sectors can be erased, including full‑chip erase.
Driving the RESET pin low terminates any embedded program or erase algorithm and forces the internal state machine back to read mode.
The device is offered in a 44‑pin Small Outline (SO) package and a 48‑pin Thin Small Outline (TSOP) package, both standard and reverse pinout versions.