YTD428_07 Datasheet, PDF (14/28 Pages) YAMAHA CORPORATION – IDSU ISDN DSU for Terminal Equipment

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PIN DESCRIPTIONS
s Clock Output Pins
Pin No.
32
61
62
63
64
Pin Name
CLK192K
CLK4K
CLK256K
CLK200
CLK400
I/O
Function
OUT
192 kHz clock (usually fixed to "L")
Output clock when CLKSEL = "L" and LOCAL = "L".
OUT
4 kHz clock (usually fixed to "L")
Output clock when CLKSEL = "L" and LOCAL = "L".
OUT
256 kHz clock (usually fixed to "L")
Output clock when CLKSEL = "L" and LOCAL = "L".
OUT
200 Hz clock (usually fixed to "L")
Output clock when CLKSEL = "L".
OUT
400 Hz clock (usually fixed to "L")
Output clock when CLKSEL = "L".
Remarks
Note 1, 2
Note 1, 2
Note 1
Note 1, 2
Note 1, 2
Note 1 Outputs “L” when the YTD428 is set to not output the clock. In addition, if the YTD428 is not synchronized to the network,
the frequency of the output clock is not guaranteed.
Note 2 Clock is output when REV = “H.”
s Test Pins
These are for LSI examinations, and not used in normal operation.
Be sure that each pin is set as bellow.
Pin No. Pin Name
46, 48, 49,
51 ~ 54,
57, 67,
80, 81
TEST0,
2 ~ 9,
21, 22
89, 91 ~ 93
TEST
23, 25 ~ 27
94
TEST28
47, 75 ~ 78
68, 69, 90
70 ~ 73
TEST1,
16 ~ 19
TEST10,
11, 24
TEST
12 ~ 15
79
TEST20
100
ATEI
1
ATEO
I/O
Function
IN
Test pin
Usually fixed to "H".
IN
IN
I/O
I/O
I/O
OUT
IN
I/O
Test pin
Usually fixed to "L".
Test pin
Usually fixed to "H".
Test pin
Usually pull up to "H".
Test pin
Usually pull up to "H".
Test pin
Usually fixed to "L".
Test pin
This pin must be left unconnected.
Test pin
Usually fixed to "L".
Test pin
Usually pulled up to "H".
Remarks
with pull-up
resistor
with pull-up
resistor