MAX3245ECAI datasheet(8/21 Pages) MAXIM

Part #	MAX3245ECAI

Description	15,-15kV ESD-Protected, 1muA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers

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Manufacturer	MAXIM [Maxim Integrated Products]

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±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V,

RS-232 Transceivers with AutoShutdown Plus

Pin Description (continued)

MAX3224E

MAX3225E

MAX3226E

MAX3227E

TQFN

DIP/

SSOP/

TSSOP

TQFN

SSOP/

TSSOP

MAX3244E

MAX3245E

SO/ SSOP/ TSSOP

MAX3245E

TQFN

NAME

FUNCTION

12

14

9

12

23

25

FORCEON

Force-On Input, Active High.

Drive high to override

AutoShutdown Plus, keeping

transmitters and receivers on

(

FORCEOFF must be high)

(Table 1).

16

18

11

14

25

27

GND

Ground

17

19

12

15

26

29

VCC

+3.0V to +5.5V Single Supply

Voltage

18

20

13

16

22

24

FORCEOFF

Force-Off Input, Active Low.

Drive low to shut down

transmitters, receivers

(except R2OUTB), and

charge pump. This overrides

AutoShutdown Plus and

FORCEON (Table 1).

—

20

21

R2OUTB

TTL/CMOS Noninverting

Complementary Receiver

Outputs. Always active.

—

6, 10, 14,

18, 22, 28,

32, 36

N.C.

No Connection. Not internally

connected.

—

EP

Exposed Pad. Solder the

exposed pad to the ground

plane or leave unconnected.

_______________Detailed Description

Dual Charge-Pump Voltage Converter

The MAX3224E–MAX3227E/MAX3244E/MAX3245E’s

internal power supply consists of a regulated dual

charge pump that provides output voltages of +5.5V

(doubling charge pump) and -5.5V (inverting charge

pump), over the +3.0V to +5.5V range. The charge

pump operates in discontinuous mode: if the output

voltages are less than 5.5V, the charge pump is

enabled; if the output voltages exceed 5.5V, the

charge-pump is disabled. Each charge pump requires

a flying capacitor (C1, C2) and a reservoir capacitor

(C3, C4) to generate the V+ and V- supplies.

The READY output (MAX3224E–MAX3227E) is low

when the charge pumps are disabled in shutdown

mode. The READY signal asserts high when V- goes

below -4V.

8

Maxim Integrated

MAX3224E/MAX3225E/

MAX3226E/MAX3227E/MAX3244E/MAX3245E

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