YTD428_07 Datasheet, PDF (10/28 Pages) YAMAHA CORPORATION – IDSU ISDN DSU for Terminal Equipment

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PIN DESCRIPTIONS
3.2 Pin Functions
s Common Section
Pin No.
3, 13, 96
14, 25
26, 43, 58,
65, 83, 95
8, 99
19, 22
31, 50, 60
74, 88
59
41
42
Pin Name
AVSS1
AVSS2
DVSS
AVDD1
AVDD2
DVDD
CLK1536
POWMON
RESET
I/O
GND Analog ground 1 (U ref. pt.)
GND Analog ground 2 (T ref. pt.)
Function
Remarks
GND Digital ground
PWR +5 V ± 5 % analog power supply 1 (U ref. pt.)
PWR +5 V ± 5 % analog power supply 2 (T ref. pt.)
PWR +5 V ± 5 % digital power supply
IN System clock (15.36 MHz ± 50 ppm or less)
Power supply monitor of the equipment on the T ref. pt. side
IN "H": Power supply OFF
"L": Power supply ON
Haerdware reset
Apply the reset pulse for 1 ms or more after the clock oscillation to operate
hardware reset. If the pulse is less than 1 ms, the operation is
IN
unpredictable.
Hardware reset is required when all following conditions are met.
1. operated by local power
2. LPSEL = "H"
3. U ref. pt. polarity is positive.
Note Connect input pins that are not normally used to the power supply pin or ground pin.
In the same fashion, do not leave pins with pull-up resistor open. Connect them to the power supply pin or ground pin.