OX16PCI954_05 Datasheet, PDF (13/73 Pages) Oxford Semiconductor – Integrated Quad UART and PCI interface

OXFORD SEMICONDUCTOR LTD.
OX16PCI954
Note 1: Direction key:
I
Input
IU
Input with internal pull-up
O
Output
I/O Bi-directional
OD Open drain
NC No connect
Z
High impedance
P_I
P_O
P_I/O
P_OD
PCI input
PCI output
PCI bi-directional
PCI open drain
G
Ground
V
5.0V power
Note 2: Power & Ground
There are two GND and two VDD rails internally. One set of rails supply power and ground to output buffers while in switching
state (called AC power) and another rail supply the core logic, input buffers and output buffers in steady-state (called DC rail).
The rails are not connected internally. This precaution reduces the effects of simultaneous switching outputs and undesirable RF
radiation from the chip. Further precaution is taken by segmenting the GND and VDD AC rails to isolate the PCI, Local Bus and
UART pins.
DS-0029 Jul 05
External—Free Release
Page 13