Rainbow-electronics MAX13237E Manual de usuario descargar pdf (Pagina 9)

MAX13234E–MAX13237E

3Mbps RS-232 Transceivers with

Low-Voltage Interface

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Pin Descriptions

MAX13234E/

MAX13235E

MAX13236E/

MAX13237E

TSSOP

TQFN-EP

NAME FUNCTION

1 19 14 READY

Ready to Transmit Output, Active-High. READY is enabled

high when V- goes below -4V and the device is ready to

transmit.

21 16 C1+

Positive Terminal of the Voltage Doubler Charge-Pump

Capacitor

3 20 15 V+ +5.5V Generated by the Charge Pump

42 1 C1-

Negative Terminal of the Voltage Doubler Charge-Pump

Capacitor

5 3 2 C2+ Positive Terminal of the Inverting Charge-Pump Capacitor

6 4 3 C2- Negative Terminal of the Inverting Charge-Pump Capacitor

7 5 4 V- -5.5V Generated by the Charge Pump

8 6 — T2OUT RS-232 Transmitter Output 2

— — 5 RIN RS-232 Receiver Input

9 7 — R2IN RS-232 Receiver Input 2

— — 6 ROUT CMOS Receiver Output. V

referred logic.

10 8 — R2OUT CMOS Receiver Output 2. V

referred logic.

11 9 7 V

Logic-Level Supply. All CMOS inputs and outputs are related

to this supply.

— — 8 TIN CMOS Transmitter Input. V

referred logic.

12 10 — T2IN CMOS Transmitter Input 2. V

referred logic.

13 11 — T1IN CMOS Transmitter Input 1. V

referred logic.

14 12 9 FORCEON

FORCEON Input, Active-High. V

referenced logic. Drive

FORCEON high to override automatic circuitry keeping

transmitters on (FORCEOFF must be high).

See Table 1.

15 13 — R1OUT CMOS Receiver Output 1. V

referred logic.

— — 10 TOUT RS-232 Transmitter Output

16 14 — R1IN RS-232 Receiver Input 1

17 15 — T1OUT RS-232 Transmitter Output 1

18 16 11 GND Ground

19 17 12 V

+3V to +5.5V Supply Voltage

20 18 13 FORCEOFF

FORCEOFF Input, Active-Low. V

referenced logic. Drive

FORCEOFF low to shut down transmitters and on-board

charge pumps. All receiver and transmitter outputs are tri-

stated. This overrides all automatic circuitry and FORCEON

(Table 1).

— — — EP Exposed Pad. Connect EP to GND or leave unconnected.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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Rainbow-electronics MAX13237E Manual de usuario Pagina 9

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