参数资料
型号: 20H04
厂商: SMSC Corporation
英文描述: 4-PORT USB2.0 HUB CONTROLLER
中文描述: 4端口USB2.0集线器控制器
文件页数: 14/38页
文件大小: 919K
代理商: 20H04
4-Port USB2.0 Hub Controller
Datasheet
Revision 1.63 (10-14-04)
Page 14
SMSC USB20H04
DATASHEET
Table 4.4 - Biasing and Clock Oscillator Signals
NAME
BUFFER
TYPE
I-R
ACTIVE
LEVEL
N/A
DESCRIPTION
RBIAS
External 1% bias resistor.
Requires a
12K
resistor to ground. Used for
setting HS transmit current level and on-chip termination impedance.
External crystal.
24MHz crystal or external clock input when a crystal is not
used.
Connect a 5M ohm resistor from this pin to XTAL2 when a crystal is used.
External crystal.
24MHz crystal. Not connected when using an external clock.
Clock Input Enable.
When high, an external CMOS clock drives XTAL1.
XTAL1/CLKIN
ICLKx
N/A
XTAL2
CLKIN_EN
OCLKx
I
N/A
High
Table 4.5 - Power and Ground Signals
NAME
BUFFER
TYPE
ACTIVE
LEVEL
DESCRIPTION
VDD3.3
N/A
N/A
3.3V Digital Supply
. Powers digital pads.
VDD1.8
VSS
VDDA3.3
VDDA1.8
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1.8V Digital Supply
. Powers digital core.
Signal Ground
.
3.3V Analog Supply
. Powers analog I/O and 3.3V analog circuitry.
1.8V Analog Supply.
Powers 1.8V analog circuitry.
4.2
Buffer Type Descriptions
Table 4.6 – USB20H04 Buffer Type Descriptions
BUFFER
I
IPU
IPD
IS
IO8
IOSD12
DESCRIPTION
Input
Input with weak internal pull-up resistor.
Input with weak internal pull-down resistor
Input with Schmitt trigger
Input/Output with 8mA drive
Open drain with 12mA sink with Schmitt
trigger. Meets I2C-Bus Spec Version 2.1
Output with 8mA drive
Open drain with 8mA sink
XTAL clock input
XTAL clock output
Defined in USB specification
Analog Output
3.3V Tolerant Analog Pin
O8
OD8
ICLKx
OCLKx
IO-U
AO
I-R
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