OXCFU950_07 Datasheet, PDF (13/74 Pages) Oxford Semiconductor – USB/UART multi-function 16-bit PC Card device

OXFORD SEMICONDUCTOR, INC.
OXCFU950 DATA SHEET
symbol
t
description
Pad type
a
Logic type
xy
Operating voltage
h
Tolerant input voltage level
i
Input type
d
Output drive strength
p
Pull up/down resistor
Table 3: Pad Type Syntax Symbol Descriptions
values
I—input pad
O—output pad
T—Tri-state output pad
B—Bidirectional pad
A—Analogue pad
P—Power pad
C—cmos
T—TTL
33—3V3
18—1V8
00—0 V (i.e. VSS Ground)
5—5 V
N—same as operating voltage
N—normal
S—Schmitt
1—x1 drive strength
2—x2 drive strength
3—x3 drive strength
U—pull up resistor
D—pull down resistor
Note 2 : PC Card/CompactFlash Power Domain Group
• This group of signals is in the PC Card/CompactFlash power domain group.
• Supply voltage range is specified from 2.85 V to 3.6 V.
• This is also the internally connected supply to the internal regulator. Hence pin #28 should be connected to the PC
Card/CompactFlash supply source.
Note 3 : Modem Power Domain Group
• This group of I/O signals is in the MODEM power domain group.
• Supply voltage range is specified from 1.8 V to 3.6 V.
Note 4 : Analogue Power Domain Group
• This group of I/O signals is in the analogue power domain group (which supplies the oscillator and PLL).
Note 5 : USB Power Domain Group
• This group signals is in the USB power domain group.
• Supply voltage range is specified from 2.85 V to 3.6 V.
4.1 Power Supply Filtering
4.1.1 PLL Supply De-Coupling
The low frequency noise at the Vdd and Gnd supplies is automatically corrected by the PLL control loop. However, where noise
frequency exceeds the loop bandwidth (60 to 100kHz) the noise is partially converted into clock jitter.
The conversion of supply noise into long-term clock jitter is important above 700 kHz. Oxford Semiconductor recommends you to
filter Vdd in this range efficiently.
For full-speed USB applications, where the jitter must not exceed 0.5 ns peak for a time duration approximately 1.2 µs, Oxford
Semiconductor recommends you to ensure that the noise level above 700kHz is lower than 7mV rms.
DS-0023 February 2007
External—Free Release
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