LAN91C94

·ISA/PCMCIA Single-Chip Ethernet Controller
·4608 Bytes of On-Chip RAM
·Supports IEEE 802.3 (ANSI 8802-3)  Ethernet Standards
·Simultasking^TM   - Early Transmit and Early
·Receive Functions
·Hardware Memory Management Unit
·Optional Configuration via Serial EEPROM Interface (Jumperless)
·Single +5V Power Supply
·Low Power CMOS Design
·100 Pin QFP, TQFP and VTQFP Package

Operating Temperature Range ........................................0 to 70
Storage Temperature Range ....................................-55 to +150
Lead Temperature Range (soldering, 10 seconds) .................+325
Positive Voltage on any pin, with respect to Ground .......V_CC + 0.3V
Negative Voltage on any pin, with respect to Ground ...............-0.3V
Maximum V_CC...............................................................................+7V
*Stresses above those listed above could cause permanent damage to the device. This is a stress rating only and functional operation of the device at any other condition above those indicated in the operation sections of this specification is not implied.

Note: When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists, it is suggested that a clamp circuit be used.

The LAN91C94 is a VLSI Ethernet Controller that combines ISA and PCMCIA interfaces in one chip. LAN91C94 integrates all the MAC and physical layer functions, as well as the packet RAM, needed to implement a high performance 10BASE-T (twisted pair) node. For 10BASE5 (thick coax), 10BASE2 (thin coax), and 10BASE-F (fiber) implementations, the LAN91C94 interfaces to external transceivers via its AUI port.  Only one additional IC is required on most applications. 

The LAN91C94 occupies 16 I/0 locations and no memory space except for PCMCIA attribute memory space. The same I/O space is used for both ISA and PCMCIA operations. The LAN91C94 can directly  interface  the  ISA and  PCMCIA   buses and deliver no wait state operation.  Its shared  memory is sequentially accessed  with 40ns access times to any of its registers, including its packet memory.  No DMA services are used by the LAN91C94, virtually  decoupling network traffic from local or system  bus  utilization.  For packet memory management, the LAN91C94 integrates a unique hardware Memory Management Unit (MMU) with enhanced performance and decreased software overhead when compared to ring buffer and linked list

The LAN91C94 is portable  to  architectures. different CPU and bus platforms due to its flexible bus interface, flat memory structure (no pointers), and its loosely coupled buffered architecture (not sensitive to latency).