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HFA3842 Datasheet(PDF) 1 Page - Intersil Corporation

Part No. HFA3842
Description  Wireless LAN Medium Access Controller
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

HFA3842 Datasheet(HTML) 1 Page - Intersil Corporation

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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
| Intersil and Design is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2001, All Rights Reserved
Wireless LAN Medium Access Controller
The Intersil HFA3842 Wireless LAN
Medium Access Controller is part of
the PRISM® 2.4GHz radio chip set.
The HFA3842 directly interfaces with
the Intersil HFA386x family of Baseband Processors,
offering a complete end-to-end chip set solution for wireless
LAN products. Protocol and PHY support are implemented
in firmware to allow custom protocol and different PHY
The HFA3842 is designed to provide maximum performance
with minimum power consumption. Package pin layout
provides optimal PC board layout to all user interfaces.
Firmware implements the full IEEE 802.11 Wireless LAN
MAC protocol. It supports BSS and IBSS operation under
DCF, and operation under the optional Point Coordination
Function (PCF). Low level protocol functions such as
RTS/CTS generation and acknowledgement, fragmentation
and de-fragmentation, and automatic beacon monitoring are
handed without host intervention. Active scanning is
performed autonomously once initiated by host command.
Host interface command and status handshakes allow
concurrent operations from multi-threaded I/O drivers.
Additional firmware functions specific to access point
applications are also available.
Designing wireless protocol systems using the HFA3842 is
made easier with the availability of evaluation board,
firmware, software device drivers, and complete
The HFA3842 is a WLAN MAC Controller IC, based on the
HFA3841. Pin-for-pin upgrade replacement for the HFA3841.
• New start up modes allow the PCMCIA Card Information
Structure to be initialized from a serial EEPROM. This
allows firmware to be downloaded from the host,
eliminating the parallel Flash memory device.
• Firmware can be loaded from serial Flash memory.
• Direct attachment to a typical x16 SRAM using five control
signals (RAMCS_, MOE_, MWEL_, MLBE_, and MUBE_).
• Low frequency crystal oscillator to maintain time and allow
baseband clock source to power off during sleep mode.
• Improved performance of internal WEP engine.
• On-chip execution can now be viewed while in debug mode.
• Independent programmable cycle timing for external chip
selects allows attachment of slow memory devices without
compromising higher speed instruction execution.
• Pinout is backward compatible with HFA3841.
• IEEE802.11 Standard Data Rates: 1, 2, 5.5 and 11Mbps
• Part of the Intersil PRISM Wireless LAN Chip Set
• Full Implementation of the MAC Protocol Specified in
IEEE Standards 802.11-1999 and 802.11b
• PCMCIA Host Interface Supports Full 16-Bit
Implementation of PC Card 16 (1995), also ISA PNP with
Additional Chip
• Host Interface Provides Dual Buffer Access Paths
• External Memory Interface Supports up to 4M bytes RAM
• Internal Encryption Engine Executes IEEE802.11 WEP
• Low Power Operation; 25mA Active, 8mA Doze, <1mA
• Operation at 2.7V to 3.6V Supply
• 5V Tolerant Host Interface Input/Outputs
• 128 Pin LQFP Package Targeted for Type II PC Cards
• IEEE802.11 Wireless LAN MAC Protocol Firmware and
Microsoft® Windows® Software Drivers
• Pin for Pin Replacement for the HFA3841 Supporting all
Functions and operations of the HFA3841
• High Data Rate Wireless LAN
• PC Card Wireless LAN Adapters
• PCI Wireless LAN Cards (Using Ext. Bridge Chip)
• Wireless LAN Modules
• Wireless LAN Access Points
• Wireless Bridge Products
• Wireless Point-to-Multipoint Systems
Ordering Information
-40 to 85
128 Ld LQFP
-40 to 85
Tape and Reel
Data Sheet
June 2001
Microsoft® and Windows® are registered trademarks of Microsoft Corporation.
PRISM® is a registered trademark of Intersil Americas Inc.
PRISM and design is a trademark of Intersil Americas Inc.

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