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XRT4000 Datasheet(PDF) 7 Page - Exar Corporation

Part # XRT4000
Description  Universal Multiprotocol Serial Interface
Download  46 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT4000 Datasheet(HTML) 7 Page - Exar Corporation

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XRT4000
Rev. 1.00
- 7 -
PIN DESCRIPTION (CONT’D)
Pin
#
Symbol
DTE
Mode
DCE
Mode
Type
Function
35
TR7
LLA
LLA
I/O
DTE Mode - Transmitter 7 - Single Ended Data Output to line
DCE Mode - Receiver 7 - Single Ended Data Input from line
36
TX76D
D_LL
D_DCD
I
Digital Input - Refer to Mode Control Table
37
TR6A
DCDA
DCDA
I/O
DTE Mode - Receiver 6 - Negative Data Differential Input
from line
DCE Mode - Transmitter 6 - Negative Data Differential
Output to line
38
TR6B
DCDB
DCDB
I/O
DTE Mode - Receiver 6 - Positive Data Differential Input from
line
DCE Mode - Transmitter 6 - Positive Data Differential Output
to line
39
DCE/DTE*
LOW
HIGH
I
DCE/DTE Select - Selects operating mode. Logic 0: DTE
Mode. Logic 1: DCE Mode. Internal 20K
Ω pull-up
40
RX67D
D_DCD
D_LL
O
Digital Output - Refer to Mode Control Table
41
RX5D
D_DSR
D_DTR
O
Receiver 5 - Digital Data Output to equipment
42
EC*
I
Enable Clock Mode - Active Low, Logic 0: Echoed Mode.
Logic 1: Normal Mode. Internal 20K
Ω pull-up
43
RX5B
DSRB
DTRB
I
Receiver 5 - Positive Data Differential Input from line
44
RX5A
DSRA
DTRA
I
Receiver 5 - Negative Data Differential Input from line
45
RX4A
CTSA
RTSA
I
Receiver 4 - Negative Data Differential Input from line
46
RX4B
CTSB
RTSB
I
Receiver 4 - Positive Data Differential Input from line
47
SLEW_
CNTL
O
Analog Output - Resistor connected between this pin and
Ground controls transmitter output pulse rise and fall time in
V.10 or V.28 mode as specified in Figures 15 and 16
respectively.
48
RX4D
D_CTS
D_RTS
O
Receiver 4 - Digital Data Output to equipment
49
GND
Digital GND for Receiver 4, 5, 6
50
NC
51
NC
52
GND
Analog GND for bias generator.
53
NC
54
VSS
Analog Substrate - Connect to -6V
55
E_232H*
I
High Speed RS-232 Enable - Logic 0: Enables high speed
RS-232 mode (drives 3K
Ω in parallel with 1000pF at 256KHz).
Internal 20K
Ω pull-up
56
VDD
Analog VDD for bias generation circuit; Connect to +5V
57
VPP
VPP - Connect to +12V supply
58
NC
59
NC
60
NC
61
NC
62
VPP
VPP - Connect to +12V supply
63
VR
O
VR - Internally generated +2.2V Reference (Sources 20
µA
maximum)
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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