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SL811S/T
Document #: 38-08009 Rev. **
Page 18 of 27
6.5
SL811ST 48-Pin LPQFP Mechanical Dimensions
6.6
SL811ST USB Controller, Pin Descriptions
The SL811ST is packaged in a 48-Pin LPQFP. The device requires 3.3VDC or +5VDC (VDD1) and a +3.3 VDC (VDD2) power
supply. Average typical current consumption is less than 22 mA for 3.3 V. The SL811ST requires an external 48-MHz Crystal or
Clock.
Pin No.
Pin Type
Pin Name
Pin Description
1NC
NC
NC
2NC
NC
NC
3
IN
nWR
Write Strobe Input. An active low input used with nCS to write to registers/data
memory.
4
IN
nCS
Active low SL811ST Chip select. Used with nRD and nWR when accessing
SL811ST.
5
IN
CM
Clock Mode. Enables DPLL 4x Multiplier when ‘1’. For use with 12-MHz Clock.
Tie to gnd for 48-MHz.
6
VDD2
3.3 VDC
Power for USB Transceivers. VDD2 may be derived from VDD1. Note 4???
7
BIDIR
DATA+
USB Differential Data Signal High Side.
8
BIDIR
DATA–
USB Differential Data Signal Low Side.
9
GND
USB GND
Ground Connection for USB.
10
NC
NC
NC
11
NC
NC
NC
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