ST16C452IJ68 datasheet(6/30 Pages) EXAR

Il numero della parte	ST16C452IJ68

Spiegazioni elettronici	DUAL UART WITH PARALLEL PRINTER PORT

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Produttore elettronici	EXAR [Exar Corporation]

Homepage	http://www.exar.com

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ST16C452/452PS

Rev. 3.20

Symbol

Signal Type

Pin Description

with a printer to select the printer with an active low.

-STROBE

55

I/O

Strobe (open drain, with internal pull-up) - General purpose

I/O or data strobe output. Normally this output is connected

to a printer and indicates that valid data is available at the

printer port (PD0-PD7).

N.C.

22,42

Not Used. Should be left open.

VCC

23,40,64

Pwr

2.97 to 5.5V power supply input. All inputs are 5V tolerant

except for XTAL1 and all printer port inputs for devices with top

mark date code of "F2 YYWW" and newer.

-CD A/B

29,8

I

Carrier Detect (active low) - These inputs are associated

with individual UART channels A through B. A logic 0 on this

pin indicates that a carrier has been detected by the modem

for that channel.

-CTS A/B

28,13

I

Clear to Send (active low) - These inputs are associated with

individual UART channels, A through B. A logic 0 on this

pin(s) indicates the modem or data set is ready to accept

transmit data from the 452/452PS for the given channel.

Status can be tested by reading MSR bit-4 for that

channel(s). -CTS has no effect on the transmit or receive

operation.

-DSR A/B

31,5

I

Data Set Ready (active low) - These inputs are associated

with individual UART channels, A through B. A logic 0 on

this pin(s) indicates the modem or data set is powered-on

and is ready for data exchange with the UART. This pin has

no effect on the UART’s transmit or receive operation.

-DTR A/B

25,11

O

Data Terminal Ready (active low) - These outputs are

associated with individual UART channels, A through B. A

logic 0 on this pin(s) indicates that the 452/452PS is

powered-on and ready. This pin can be controlled via the

modem control register for channel(s) A-B. Writing a logic

1 to MCR bit-0 will set the -DTR output to logic 0, enabling

the modem. This pin will be a logic 1 after writing a logic 0

to MCR bit-0, or after a reset. This pin has no effect on the

UART’s transmit or receive operation.

-RI A/B

30,6

I

Ring Indicator (active low) - These inputs are associated with

SYMBOL DESCRIPTION

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