DS21348

Manufacturer Part NumberDS21348
Description3.3V E1/T1/J1 Line Interface
ManufacturerDallas Semiconducotr
DS21348 datasheet
 


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ACRONYM
PIN
I/O
4
SCLKE
TCLK
43
TEST
26
TNEG
42
13
TPD
TPOS
41
TTIP/
34/
TRING
37
TX0/
14/
TX1
15
21/
V
DD
36
VSM
20
V
22/
SS
35
NOTES:
1) G.703 requires an accuracy of ±50ppm for both T1 and E1. TR62411 and ANSI specs require an
accuracy of ±32ppm for T1 interfaces.
2) * Denotes active low.
DESCRIPTION
I
Receive & Transmit Synchronization Clock Enable. SCLKE
combines RSCLKE (CCR5.3) and TSCLKE (CCR5.2).
0 = disable 2.048 MHz synchronization transmit and receive mode
1 = enable 2.048 MHz synchronization transmit and receive mode
I
Transmit Clock. A 2.048MHz or 1.544MHz primary clock. Used to
clock data through the transmit side formatter. Can be sourced
internally by MCLK or RCLK. See Common Control Register 1 and
Figure 3-3.
I
3-State Control. Set high to 3-state all outputs and I/O pins
(including the parallel control port). Set low for normal operation.
Useful in board level testing.
I
Transmit Negative Data. Sampled on the falling edge (CCR2.1 =
0) or the rising edge (CCR2.1 = 1) of TCLK for data to be
transmitted out onto the line.
I
Transmit Power-Down.
0 = normal transmitter operation
1 = powers down the transmitter and 3-states the TTIP and TRING
pins
I
Transmit Positive Data. Sampled on the falling edge (CCR2.1 = 0)
or the rising edge (CCR2.1 = 1) of TCLK for data to be transmitted
out onto the line.
O
Transmit Tip and Ring [TTIP & TRING]. Analog line driver
outputs. These pins connect via a step-up transformer to the line.
See Section 7 for details.
I
Transmit Data Source Select Bits 0 & 1 [H/W Mode]. These
inputs determine the source of the transmit data. See Table 4-6.
-
Positive Supply. 5.0V ±5%
I
Voltage Supply Mode. Should be tied high for 5V operation.
-
Signal Ground.
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