AT49LL040

• Conforms to Intel LPC Interface Specification 1.0
• 8M, 4M or 2M Bits of Flash Memory for Platform Code/Data Storage Available in 8M Bits (AT49LL080), 4M Bits (AT49LL040) and 2M Bits (AT49LL020) Automated Byte-program and Sector-erase Operations
• Two Configurable Interfaces Low Pin Count (LPC) Interface for In-System Operation Address/Address Multiplexed (A/A Mux) Interface for Programming during Manufacturing
• Low Pin Count Hardware Interface Mode 5-signal Communication Interface Supporting x8 Reads and Writes Read and Write Protection for Each Sector Using Software-controlled Registers Two Hardware Write-protect Pins: One for the Top Boot Sector, One for All Other Sectors Five General-purpose Inputs, GPIs, for Platform Design Flexibility Operates with 33 MHz PCI Clock and 3.3V I/O
• Address/Address Multiplexed (A/A Mux) Interface 11-pin Multiplexed Address and 8-pin Data Interface Supports Fast On-board or Out-of-system Programming
• Power Supply SpecificationsVCC: 3.3V ± 0.3VVPP: 3.3V and 12V for Fast Programming
• Industry-standard Package 40-lead TSOP or 32-lead PLCC

The AT49LL080, AT49LL040 and the AT49LL020 are Flash memory devices designedto interface with the LPC bus for PC Applications. A feature of the AT49LL080/040/020is the nonvolatile memory core. The high-performance memory is arranged in sixteen(AT49LL080), eleven (AT49LL040) sectors or seven (AT49LL020) (see page 11).

The AT49LL080/AT49LL040/020 supports two hardware interfaces: Low Pin Count (LPC) forin-system operation and Address/Address Multiplexed (A/A Mux) for programmingduring manufacturing. The IC (Interface Configuration) pin of the device provides thecontrol between the interfaces. The interface mode needs to be selected prior topower-up or before return from reset (RST or INIT low to high transition).