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XRT83SH314IB Datasheet(PDF) 9 Page - Exar Corporation

Part # XRT83SH314IB
Description  14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT83SH314IB Datasheet(HTML) 9 Page - Exar Corporation

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XRT83SH314
5
REV. 1.0.3
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
DATA7
DATA6
DATA5
DATA4
DATA3
DATA2
DATA1
DATA0
AA4
AB3
AC3
AA5
Y6
AB4
AC4
AB5
I/O
Bi-directional Data Bus
DATA[7:0] is a bi-directional data bus used for read and write operations.
µPTS2
µPTS1
µPTS0
AC23
AB22
AA21
I
Microprocessor Type Select Input
µPTS[2:0] are used to select the microprocessor type interface.
000 = Intel 68HC11, 8051, 80C188 (Asynchronous)
001 = Motorola 68K (Asynchronous)
111 = Motorola MPC8260, MPC860 Power PC (Synchronous)
Reset
B22
I
Hardware Reset Input
Active low signal. When this pin is pulled "Low" for more than 10µS, the inter-
nal registers are set to their default state. See the register description for the
default values.
NOTE: Internally pulled "High" with a 50K
Ω resistor.
CS5
CS4
CS3
CS2
CS1
B20
A21
C20
D19
B21
O
Chip Select Output
The XRT83SH314 can be used to provide the necessary chip selects for up to
5 additional devices by using the 3 MSBs ADDR[10:8] from the 11-Bit address
bus. The LIU allows up to 84-channel applications with only using one chip
select. See the ADDR[10:0] definition in the pin description.
RECEIVER SECTION
NAME
PIN
TYPE
DESCRIPTION
RxON
AB19
I
Receive On/Off Input
Upon power up, the receivers are powered off. Turning the receivers On or Off
can be selected through the microprocessor interface by programming the
appropriate channel register if the hardware pin is pulled "High". If the hard-
ware pin is pulled "Low", all channels are automatically turned off.
NOTE: Internally pulled "Low" with a 50K
Ω resistor.
RxTSEL
Y15
I
Receive Termination Control
Upon power up, the receivers are in "High" impedance. Switching to internal
termination can be selected through the microprocessor interface by program-
ming the appropriate channel register. However, to switch control to the hard-
ware pin, RxTCNTL must be programmed to "1" in the appropriate global
register. Once control has been granted to the hardware pin, it must be pulled
"High" to switch to internal termination.
NOTE: Internally pulled "Low" with a 50k
Ω resistor.
MICROPROCESSOR
NAME
PIN
TYPE
DESCRIPTION


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