73K321L Просмотр технического описания (PDF) - TDK Corporation

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73K321L

CCITT V.23, V.21 Single-Chip Modem

TDK Corporation 

73K321L

CCITT V.23, V.21

Single-Chip Modem

DTE USER INTERFACE

NAME

EXCLK

PLCC/DIP

PIN NUMBER

19

RXCLK

23

RXD

22

TXCLK

18

TXD

21

TYPE DESCRIPTION

I

O

O/

Weak

Pull-up

O

I

External Clock. Used for serial control interface to clock control data

in or out of the 73K321L.

Receive Clock. A clock which is 16 x1200, or 16 x 75 in V.23 mode,

or 16 x 300 baud data rate is output in V.21.

Received Digital Data Output. Serial receive data is available on this

pin. The data is always valid on the rising edge of RXCLK when in

Synchronous mode. RXD will output constant marks if no carrier is

detected.

Transmit Clock. TXCLK is always active. In V.23 mode the output is

either a 16 x 1200 baud clock or 16 x 75 baud, in V.21 mode the clock

is 16 x 300 baud.

Transmit Digital Data Input. Serial data for transmission is input on

this pin. In Asynchronous modes (1200 or 300 baud) no clocking is

necessary.

ANALOG INTERFACE AND OSCILLATOR

RXA

TXA

XTL1

XTL2

27

I

Received modulated analog signal input from the phone line.

16

O

Transmit analog output to the phone line.

2

I

These pins are for the internal crystal oscillator requiring an 11.0592

3

I

MHz Parallel mode crystal and two load capacitors to Ground. XTL2

can also be driven from an external clock.

5

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