LPC47N237-MD View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

LPC47N237-MD

3.3v I/O Controller for Port Replicators and Docking Stations

SMSC -> Microchip 

3.3v I/O Controller for Port Replicators and Docking Stations

Note 4.1 The “n” as the first letter of a signal name or the “#” as the suffix of a signal name indicates an “Active

Low” signal.

Note 4.2 The Buffers are described in the “Buffer Name Description” section.

Note 4.3

Pins that require external pull-ups (including open-drain outputs) are listed in the “Pins That Require

External Resistors” section and should be pulled to the supply shown in the power well column. Other

output pins are driven under the power well shown. Inputs pins that are shown under suspend power

well are design dependent and may not be active under suspend power.

Note 4.4 The 24MHz XTAL is active under VTR power when VCC is off. This is the clock source to the SMBus

block.

Note 4.5 The 24MHz output is active under VCC power only.

Note 4.6 The nLPCPD pin may be tied high. The LPC interface will function properly if the nPCI_RESET signal

follows the protocol defined for the nLRESET signal in the “Low Pin Count Interface Specification”.

Note 4.7 This pin is input to VCC and VTR powered logic internal to the part.

Note 4.8 The SYSOPT pin requires an external pulldown resistor to put the base IO address for configuration at

0x02E. An external pullup resistor is required to move the base IO address for configuration to 0x04E.

4.1

Note:

Buffer Name Description

The buffer type values are specified at VCC=3.3V. Refer to the “Operational Description” section.

I

IS

IS2

ICLK

OCLK

O8

OD8

IO8

IS2OD12

O12

OD12

OP14

IOP14

PCI_I

PCI_O

PCI_IO

PCI_IOD

PCI_ICLK

Input TTL Compatible.

Input with 100mV Schmitt Trigger.

Input with 250mV Schmitt Trigger.

Crystal Input

Crystal Output

Output, 8mA sink, 4mA source.

Open Drain Output, 8mA sink.

Input/Output, 8mA sink, 4mA source.

Input with 250mV Schmitt Trigger/Output (Open Drain), 12mA sink.

Output, 12mA sink, 6mA source.

Open Drain Output, 12mA sink.

Output, 14mA sink, 14mA source.

Input/Output, 14mA sink, 14mA source. Backdrive protected.

Input. These pins meet the PCI 3.3V AC and DC Characteristics. (Note 4.9)

Output. These pins meet the PCI 3.3V AC and DC Characteristics. (Note 4.9)

Input/Output. These pins meet the PCI 3.3V AC and DC Characteristics. (Note 4.9)

Input/Output (Open Drain). These pins meet the PCI 3.3V AC and DC Characteristics. (Note 4.9)

Clock Input. These pins meet the PCI 3.3V AC and DC Characteristics and timing. (Note 4.10)

Note 4.9 See the “PCI Local Bus Specification,” Revision 2.1, Section 4.2.2.

Note 4.10 See the “PCI Local Bus Specification,” Revision 2.1, Section 4.2.2 and 4.2.3.

Revision 0.3 (10-26-04)

Page 18

DATASHEET

SMSC DS – LPC47N237

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