YTD428_07 Datasheet, PDF (13/28 Pages) YAMAHA CORPORATION – IDSU ISDN DSU for Terminal Equipment

PIN DESCRIPTIONS
- 11 -
s U Reference Point Section
Pin No.
2
4
5
6
7
9
10
11
12
97
98
Pin Name
RXU1
SGR
RXU2
RUC
SGA
RXS
SGB
SGBP
SXA
VRB
VRT
I/O
Function
Remarks
IN Receive signal input 1
OUT Analog signal reference output
IN Receive signal input 2
- 0.1 µF capacitor is to be connected across the RUC pin and the AVSS1 pin.
-
0.0047 µF (10%) capacitor is to be connected across the SGA pin and the
SGR pin.
-
0.0022 µF (10%) capacitor is to be connected across the RXS pin and the
SGR pin.
-
0.015 µF (10%) capacitor is to be connected across the SGB pin and the
SGR pin.
-
0.15 µF (10%) capacitor is to be connected across the SGBP pin and the
SGR pin.
- This pin must be left unconnected.
OUT
ADC reference power supply (low voltage)
0.1 µF capacitor is to be connected across the VRB pin and the AVSS1 pin.
OUT
ADC reference power supply (high voltage)
0.1 µF capacitor is to be connected across the VRT pin and the AVSS1 pin.
Pin No.
84
85
86
87
Pin Name
UDM0
UDM1
UDP0
UDP1
I/O
OUT Negative pulse driving signal
OUT Negative pulse driving signal
OUT Positive pulse driving signal
OUT Positive pulse driving signal
Function
Remarks
Pin No.
40
55
56
Pin Name
REV
LOOP2A
LPSW
I/O
Function
U ref. pt. polarity
When LPSEL = "H", set this pin to "H".
IN When LPSEL = "L", set this pin as bellow.
"L": positive polarity
"H": reverse polatity
OUT
"L": normal operation
"H": indicating loopbak 2
Call control signal
OUT "L": normal operation
"H": call initiate request
Remarks