參數(shù)資料
型號： XRT4000
廠商： Exar Corporation
英文描述： Universal Multiprotocol Serial Interface
中文描述： 通用多協(xié)議串行接口
文件頁數(shù)： 8/46頁
文件大小： 396K
代理商： XRT4000
XRT4000
Rev. 1.00
- 8 -
Pin
#
64
65
Symbol
DTE
Mode
DCE
Mode
Type
Function
REG_CLK
2CK/3CK*
I
I
Clock
- For Transmitter 5, 8 input register. Internal 20K
pull-up
2 or 3 Clock Select
- Internal 20K
pull-up
Logic Don’t Care
: 1 Clock When Mode = X.21 (M2, M1, M0= 011)
Logic 0
: 3 Clocks When Mode
≠
X.21 (M2, M1, M0
≠
011)
Logic 1
: 2 Clocks When Mode
≠
X.21 (M2, M1, M0
≠
011)
Test Oscillator Enable
- Active Low;
Logic
0: Oscillator Enabled.
Logic 1
: Oscillator Disabled. Internal 20K
pull-up
Invert Clock
- Active Low;
Logic 0
: Clock Inverted.
Logic 1
: Clock not Inverted. Internal 20K
pull-up
Invert Data
- Active Low;
Logic 0
: Data Inverted.
Logic 1
: Data not Inverted. Internal 20K
pull-up
Digital VSS
for Transmitter 1, 2, 3 Output Drivers;
Connect to -6V
Digital GND
for Transmitter 1, 2, 3 Output Drivers
Digital VDD
for Transmitter 1, 2, 3 Output Drivers;
Connect to +5V
Analog VDD
for Transmitter 1, 2; Connect to +5V
Analog VSS
for Transmitter 1, 2; Connect to -6V
Analog GND
for Transmitter 1, 2 “T” termination
Transmitter 1
- Digital Data Input from equipment
AC GND
- Transmitter 1 Output Termination center tap in V.35 mode
Transmitter 1
- Positive Data Differential Output to line
Transmitter 1
- Negative Data Differential Output to line
Transmitter 2
- Negative Data Differential Output to line
Transmitter 2
- Positive Data Differential Output to line
AC GND
- Transmitter 2 Output Termination center tap in V.35 mode
Transmitter 2
- Digital Data Input from equipment
Digital VDD
for Receiver and Transmitter 1, 2, 3; Connect to +5V
DTE Mode
- Input not used
DCE Mode
- Transmitter 3 - Digital Data Input from equipment
Digital VSS
for Receiver and Transmitter 1, 2, 3; Connect to -6V
DTE Mode -
AC GND - Transmitter 3 Output Termination center tap
in V.35 mode
DCE Mode
- AC GND - Receiver 3 Input Termination center tap in
V.35 mode
DTE Mode
- Receiver 3 - Negative Data Differential Input from line.
DCE Mode -
Transmitter 3 - Negative Data Differential Output to
line.
66
EN_OSC*
I
67
CKINV*
I
68
DTINV*
I
69
VSS
70
71
GND
VDD
72
73
74
75
76
77
78
79
80
81
82
83
84
VDD
VSS
GND
TX1D
CM_TX1
TX1B
TX1A
TX2A
TX2B
CM_TX2
TX2D
VDD
TX3D
D_TXD
D_RXD
I
O
O
O
O
O
O
I
TXDB
TXDA
SCTEA
SCTEB
RXDB
RXDA
RXCA
RXCB
D_SCTE
D_RXC
D_X
D_TXC
I
85
86
VSS
CM_TR3
O
87
TR3A
TXCA
TXCA
I/O
Note:
An asterisk (*) following a pin symbol indicates that the pin is active low.
Names begining with D_ are digital signals.
Names ending with B and A are the positive and negative polarities of differential signals respectively
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