ST3243B(2011) Просмотр технического описания (PDF) - STMicroelectronics

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ST3243B
(Rev.:2011)

3 to 5.5 V, 400 kbps, RS-232 transceiver with auto-power-down

STMicroelectronics 

ST3243B ST3243C

Pin configuration

Table 2. Pin description (continued)

Pin n°

Symbol

Name and function

14

T1IN

First transmitter input voltage

15

R5OUT

Fifth receiver output voltage

16

R4OUT

Fourth receiver output voltage

17

R3OUT

Third receiver output voltage

18

R2OUT

Second receiver output voltage

19

R1OUT

First receiver output voltage

20

R2OUTB

Non-inverting complementary receiver output, always active for wake-up

21

INVALID

Output of the valid signal detector. Indicates if a valid RS-232 level is present

on receiver inputs logic “1”

22

FORCEOFF

Drive low to shut down transmitters and on-board power supply. This

overrides all automatic circuitry and FORCEON

Drive high to override automatic circuitry keeping transmitters on

23

FORCEON

(FORCEOFF must be high)

24

C1-

Negative terminal of voltage-charge pump capacitor

25

GND

Ground

26

VCC

Supply voltage

27

V+

5.5 V generated by the charge pump

28

C1+

Positive terminal of voltage-charge pump capacitor

Table 3. Truth table

FORCEOFF

0

1

TOUT

HIGH Z

ACTIVE(1)

ROUT

HIGH Z

ACTIVE(1)

R2OUTB

ACTIVE(1)

ACTIVE(1)

1. If the part is in auto-power-down mode (FORCEOFF = VCC, FORCEON = GND) it is shutdown, if no valid RS-232 levels

are present on all receiver input.

Doc ID 7539 Rev 10

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