參數(shù)資料
型號(hào): DS21348TN
廠商: DALLAS SEMICONDUCTOR
元件分類: Digital Transmission Interface
英文描述: DATACOM, PCM TRANSCEIVER, PQFP44
封裝: TQFP-44
文件頁(yè)數(shù): 6/67頁(yè)
文件大?。?/td> 339K
代理商: DS21348TN
DS21348/Q348
14 of 67
Acronym
Pin
I/O
Description
TPD
13
I
Transmit Power Down.
0 = normal transmitter operation
1 = powers down the transmitter and tri-states the TTIP and TRING
pins
TPOS
41
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.
TTIP/
TRING
34/
37
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.
TX0/
TX1
14/
15
I
Transmit Data Source Select Bits 0 & 1 [H/W Mode]. These
inputs determine the source of the transmit data. See Table 4-5.
VDD
21/
36
-
Positive Supply. 3.3 volts +/-5%.
VSM
20
I
Voltage Supply Mode. Should be tied low for 3.3V operation.
VSS
22/
35
-
Signal Ground.
WR*
(R/W*)
3I
Write Input (Read/Write).
WR* is an active low signal. See the
Bus Timing Diagrams in section 12.
NOTES:
1. Serial Port Mode pins are double underlined and Hardware Mode pins are single underlined.
2. G.703 requires an accuracy of +/-50 ppm for both T1 and E1. TR62411 and ANSI specs require an
accuracy of +/- 32 ppm for T1 interfaces.
3. * Denotes active low.
相關(guān)PDF資料
PDF描述
DS21348G DATACOM, PCM TRANSCEIVER, BGA49
DS21Q348N DATACOM, PCM TRANSCEIVER, PBGA144
DS21Q348 DATACOM, PCM TRANSCEIVER, PBGA144
DS21352L DATACOM, PCM TRANSCEIVER, PQFP100
DS21352LN DATACOM, PCM TRANSCEIVER, PQFP100
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