3 (10)

DA9138.005

12 April, 2006

PIN DESCRIPTION

Pin name

Pin no.

I/O

Function

PDIP

SO

TDI

9

9

I

Transmitter data input. 1 = mark or stop bit. 0 = space, start or break

signal.

TDO

10

10

O

Transmitter data output. Output data is synchronized to the

synchronous timing signal TXC (pin 4). 1 = mark. 0 = space.

XASY

11

11

I

Asynchronous mode. XASY = 0 Asynchronous transmission, XASY = 1

Synchronous transmission. In synchronous transmission the converter

is totally bypassed in both directions: TDI = TDO, RDI = RDO

XHST

12

12

I

Higher speed signalling timing. XHST = 1 normal synchronous to

asynchronous conversion (CCITT V.14). XHST = 0 asynchronous to

synchronous conversion with higher speed synchronous timing (TXC,

RXC). TXC and RXC timing must be 1-2% higher than the normal bit

rate in order to allow some overspeed in the asynchronous data.

On the receiver side the RX buffer is deleted and the synchronous

data RDI is directly connected to the asynchronous output RDO.

RDO

13

13

O

Receiver data output. RDO is the received data converted back to

asynchrnous mode.

1 = mark or stop bit, 0 = space, start or break signal

RDI

14

14

I

Receiver data input. 1 = mark, 0 = space. The received data must be

synchronized to the receiver timing RXC from the synchronous

channel (pin 15).

RXC

15

15

I

Receiver timing (MAS9138 only). Receiver square wave timing from

the synchronous channel. The received data RDI must be

synchronized to the rising edge of RXC.

VDD

16

16

P

Power supply

ABSOLUTE MAXIMUM RATINGS

(GND = 0V)

Parameter

Symbol

Conditions

Min

Max

Unit

Supply Voltage

VDD

-0.5

5.5

V

Storage Temperature

Ts

-55

+150

RECOMMEDED OPERATION CONDITIONS

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Supply Voltage

VDD

3

3.3 to

5.0

5.25

V

Supply current

IDD

VDD = 5V

2

5

mA

Operating Temperature

Ta

-40

+85