MAX3250 데이터 시트보기 (PDF) - Maxim Integrated

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MAX3250

±50V Isolated, 3.0V to 5.5V, 250kbps, 2 Tx/2 Rx, RS-232 Transceiver

Maxim Integrated 

MAX3250

±50V Isolated, 3.0V to 5.5V, 250kbps,

2 Tx/2 Rx, RS-232 Transceiver

Pin Description

PIN

1

2

3

4

5

6, 22, 23

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

24

25

26

27

28

NAME

C1-

R1OUT

R2OUT

T1IN

T2IN

N.C.

N.C.

C1+

C3+

V+

C3-

C4+

C4-

V-

ISOCOM

T2OUT

T1OUT

R2IN

R1IN

ISOVCC

C2+

SHDN

FAULT

GND

C2-

VCC

FUNCTION

Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1- to C1+.

See Table 1 for values.

TTL/CMOS Receiver Output

TTL/CMOS Receiver Output

TTL/CMOS Transmitter Input

TTL/CMOS Transmitter Input

No Connection. Not internally connected.

No Connection. Leave unconnected or connect to ISOCOM.

Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1+ to C1-.

See Table 1 for values.

Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from

C3+ to C3-.

+5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V+ to ISOCOM with a

0.47µF capacitor.

Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from

C3- to C3+.

Positive Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from

C4+ to C4-.

Negative Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from

C4- to C4+.

-5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V- to ISOCOM with a 0.47µF

capacitor.

Isolated Ground

RS-232 Transmitter Output

RS-232 Transmitter Output

RS-232 Receiver Input

RS-232 Receiver Input

Internally Generated Isolated Power-Supply Voltage, Referenced to ISOCOM. Bypass ISOVCC to

ISOCOM with a 2.2µF capacitor.

Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2+ to C2-.

See Table 1 for values.

Shutdown Control. Drive SHDN low to enter low-power shutdown mode. Drive SHDN high or connect

to VCC for normal operation.

Overvoltage Indicator. Active low, open drain.

Ground

Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2- to C2+.

See Table 1 for values.

3.0V to 5.5V Supply Voltage. Bypass VCC to GND with a 1µF capacitor.

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