Low Power T1 PCM Repeaters/Transceivers — LXT312A/LXT315A
Figure 2. LXT312A/LXT315A Pin Assignments and Package Markings
Package Topside Markings
Marking
Part #
Rev #
Lot #
FPO #
Unique identifier for this product family.
Identifies the particular silicon “stepping” — refer to the specification update for additional stepping information.
Identifies the batch.
Identifies the Finish Process Order.
Definition
Table 1.
Pin #
LXT 312A / LXT315A Signal Descriptions
Symbol
I/O
I
I
O
O
O
I
O
–
–
–
O
O
I
I
O
Description
PDIP
1
2
4
6
7
11
12
3
8
16
9
1
10
1
14
1
15
1
5
1
PLCC
1
2
4
20
21
25
26
3
22
44
23
1
24
1
42
1
43
1
19
1
2
RTIP1
RRING1
RCLK1
TTIP1
TRING1
XTI
XTO
VCC
GNDT
GNDR
TRING2
TTIP2
RRING2
RTIP2
RCLK2
Repeater Tip and Ring Inputs.
Tip and ring receive inputs for Channel 1.
Recovered Clock.
Clock output recovered from Channel 1 receive input.
Repeater Tip and Ring Outputs.
Open-drain output drivers for Channel 1.
Crystal Oscillator Pins.
A 6.176 MHz crystal should be connected across these two
pins. For alternative timing references, refer to Application Information.
Power Supply.
Power supply input for all circuits. +5 V (±0.25 V).
Transmit Ground.
Ground return for transmit circuits.
Receive Ground.
Ground return for receive circuits.
Side 2 Ring and Tip Outputs.
On the LXT312A dual repeater/transceiver, these are
open-drain output drivers for Channel 2.
Side 2 Ring and Tip Inputs.
On the LXT312A repeater/transceiver, these are tip and
ring receive inputs for Channel 2.
Recovered Clock.
On the LXT312A dual repeater/transceiver, this is the recovered
clock output for Channel 2.
Loopback Control.
On the LXT312A, this pin controls Loopback Selection:
High = Loopback side 1 data to side 2. Low = No Loopback.
On LXT315A single repeater/transceiver, this pin must be connected to GND.
13
41
1
LPBK
I
1. On the LXT315NE and LXT315PE single repeater/transceiver, these pins are not connected (N/C).
2. On the LXT312PE and LXT315PE, pins 5 through 18 and 27 through 40 are not connected (N/C).
Datasheet
7
ETC [ ETC ]
