YTD421B-E View Datasheet(PDF) - Yamaha Corporation

Part Name

Description

View to exact match

YTD421B-E

ISDN Driver/Receiver

Yamaha Corporation 

3.2. PIN FUNCTIONS

9

3.2.3 Driver Section

Pin No. Pin Name I/O

8 HTD

IN

7 LTD

IN

14 LO1

OUT

12 LO2

OUT

6 TDP

IN

Function

High Pulse of Transmit Data

Inputs the high pulse of transmitting AMI signal

TTL interface

Low Pulse of Transmit Data

Inputs the low pulse of transmitting AMI signal

TTL interface

S/T Line Output (positive)

Connects to pulse transformer which drives S/T bus

S/T Line Output (negative)

Connects to pulse transformer which drives S/T bus

HTD, LTD Input Select

\H" : HTD pin, LTD pin positive polarity

\L" : HTD pin, LTD pin negative polarity

Remarks

Note 5

Note 5

Note 6

Note 7

Note 5: When pulling HTD pin and LTD pin up via a pull-up resistor, pulls them up to VDDO power source

pin.

Note 6: When making TDP pin \H", connect it to VDDO power source pin.

Note 7: \positive polarity" means the condition that voltage level = \H" when logic = binary \0". \negative

polarity" means the condition that voltage level = \L" when logic = binary \0".

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