XRT4000 Datasheet, PDF (7/46 Pages) Exar Corporation – Universal Multiprotocol Serial Interface

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