LPC47N237-MD datasheet(18/138 Pages) SMSC

18 / 138 page

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

Revision 0.3 (10-26-04)

Page 18

SMSC DS – LPC47N237

DATASHEET

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

Buffer Name Description

Note:

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

Input TTL Compatible.

Input with 100mV Schmitt Trigger.

IS2

Input with 250mV Schmitt Trigger.

ICLK

Crystal Input

OCLK

Crystal Output

Output, 8mA sink, 4mA source.

OD8

Open Drain Output, 8mA sink.

IO8

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

IS2OD12

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

O12

Output, 12mA sink, 6mA source.

OD12

Open Drain Output, 12mA sink.

OP14

Output, 14mA sink, 14mA source.

IOP14

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

PCI_I

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

PCI_O

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

PCI_IO

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

PCI_IOD

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

PCI_ICLK

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.

LPC47N237-MD Datenblatt(PDF) 18 Page - SMSC Corporation

LPC47N237-MD Datenblatt(HTML) 18 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datenblatt Download

Link URL