XRT83L34_05 Datasheet, PDF (12/99 Pages) Exar Corporation – QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

XRT83L34
xr
REV. 1.0.1 QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TRANSMITTER SECTIONS
SIGNAL NAME
TCLKE
PIN #
107
µPTS2
TTIP_0
13
TTIP_1
TTIP_2
19
TTIP_3
84
90
TYPE
I
O
DESCRIPTION
Transmit Clock Edge - Hardware Mode
With this pin set to a "High", transmit input data of all channels are sampled at
the rising edge of TCLK_n. With this pin tied "Low", input data are sampled at
the falling edge of TCLK_n.
Microprocessor Type Select Input pin 2 - Host Mode
This pin should be tied to GND. µPTS1(pin 106) selects the microprocessor
type. See “Microprocessor Type Select Input Pins/Receive Clock Edge
Select/Transmit Clock Edge Select Input Pin:” on page 17.
NOTE: This pin is internally pulled "Low" with a 50kΩ resistor.
Transmitter Tip Output for Channel _n:
This output pin, along with the corresponding TRING_n output pin, functions
as the Transmit DS1/E1 Output signal drivers for the XRT83L34 device.
The user is expected to connect this signal and the corresponding TRING_n
output signal to a "1:2.45" step-up transformer.
Whenever the Transmit Section of (a given channel within the XRT83L34
device) generates and transmits a "positive-polarity" pulse (onto the line), this
output pin will be pulsed to a "higher-voltage" than its corresponding TRING_n
output pins.
Conversely, whenever the Transmit Section (of a given channel within the
XRT83L34 device) generates and transmits a "negative-polarity" pulse (onto
the line), then this output pin will be pulsed to a "lower-voltage" than that of the
TRING_n output pin.
NOTE: This output pin will be tri-stated whenever the user sets the "TxON"
input pin (or bit-field) to "0".
TRING_0
15
O Transmitter Ring Output for Channel _n:
TRING_1
TRING_2
17
TRING_3
86
88
This output pin, along with the corresponding TTIP_n output pin, functions as
the Transmit DS1/E1" output signal drivers for the XRT83L34 device.
The user is expected to connect this signal and the corresponding TTIP_n
output signal to a "1:2.45" step-up transformer.
Whenever the Transmit Section (of a given channel, within the XRT83L34
device) generates and transmits a "positive-polarity" pulse (onto the line), this
output pin will be pulsed to a "lower-voltage" than its corresponding TTIP_n
output pin.
Conversely, whenever the Transmit Section (of a given channel, within the
XRT83L34 device) generates and transmits a "negative-polarity" pulse (onto
the line) this output pin will be pulsed to a "higher-voltage" than that of the
TTIP_n output pin.
NOTE: This output pin will be tri-stated whenever the user sets the "TxON"
input pin (or bit-field) to "0".
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