LPC47M14X datasheet(14/205 Pages) SMSC

14 / 205 page

SMSC DS – LPC47M14X

Page 14

Rev. 03/19/2001

Note 8: The GP24 /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.

Note 9: External pullups must be placed on the nKBDRST and A20M pins. These pins are GPIOs that are inputs

after an initial power-up (VTR POR). If the nKBDRST and A20M functions are to be used the system must

ensure that these pins are high. See Section “Pins That Require External Pullup Resistor”.

Note 10: The LED pins are powered by VTR so that the LEDs can be controlled when the part is under VTR power.

Note 11: The 48MHz clock input must not be driven high when VTR = 0V.

Note 12: VTR is used to power the USB cable transceivers. VTR must not be connected to VCC.

Note 13: When the specified USB Down Stream Ports are disabled via the Strp0/Strp1 bit or nStrp1/nStrp0 Pins, the

associated Over-current sense pins (nUSBOC[x]) and Power Enable (nPWREN[4:1]) pins are also

disabled. The USB Down Stream Port nUSBOC[x] input pin can be a NC (No Connect) pin for existing

designs or tied High (1). For EMI and reduced Noise sensitivity, it is recommended that the pin be tied High

(1). The Power Enable (nPWREN[x]) pin will be forced low (0).

Note 14: When a 24MHz crystal oscillator is used, these pins need off-balance capacitive loading. It is suggested to

use a 22pf capacitor on ICLK and a 10pf capacitor on OCLK.

3.1

BUFFER TYPE DESCRIPTIONS

Note: The buffer type values are specified at VCC=3.3V

IO12

Input/Output, 12mA sink, 6mA source.

O12

Output, 12mA sink, 6mA source.

OD12

Open Drain Output, 12mA sink.

Output, 6mA sink, 3mA source.

Output, 8mA sink, 4mA source.

OD8

Open Drain Output, 8mA sink.

OD14

Open Drain Output, 14mA sink.

OP14

Output, 14mA sink, 14mA source.

IOP14

Input/Output, 14mA sink, 14mA source. Back-drive protected.

IOD16

Input/Output (Open Drain), 16mA sink.

IO8

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

O24

Output, 24mA sink, 12mA source.

Input TTL Compatible.

IPU

Input TTL Compatible. With 30ua internal Pull Up

Input with Schmitt Trigger.

PCI_IO

Input/Output. These pins must meet the PCI 3.3V AC and DC Characteristics. (Note 1)

PCI_O

Output. These pins must meet the PCI 3.3V AC and DC Characteristics. (Note 1)

PCI_I

Input. These pins must meet the PCI 3.3V AC and DC Characteristics. (Note 1)

PCI_ICLK

Clock Input. These pins must meet the PCI 3.3V AC and DC Characteristics and timing. (Note 2)

IOUSB

Buffer Type for the USB differential data lines. Defined in the “Operational Description”

section according to the USB specification; V1.1

Note 1: See the “PCI Local Bus Specification,” Revision 2.1, Section 4.2.2.

Note 2: See the “PCI Local Bus Specification,” Revision 2.1, Section 4.2.2 and 4.2.3.

LPC47M14X Datasheet(PDF) 14 Page - SMSC Corporation

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