www.ti.com

DIN

DOUT

Auto-Powerdown

INVALID

RIN

FORCEOFF

FORCEON

ROUT

EN

11

16

9

13

10

8

1

12

TRSF3221

3-V TO 5.5-V SINGLE-CHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER

SLLS857 – AUGUST 2007

ORDERING INFORMATION

ORDERABLE PART NUMBER

TOP-SIDE MARKING

SSOP – DB

Reel of 2000

TRSF3221CDBR

RT21C

0

°C to 70°C

Tube of 90

TRSF3221CPW

TSSOP – PW

RT21C

Reel of 2000

TRSF3221CPWR

SSOP – DB

Reel of 2000

TRSF3221IDBR

RT21I

–40

°C to 85°C

Tube of 90

TRSF3221IPW

TSSOP – PW

RT21I

Reel of 2000

TRSF3221IPWR

(1)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

(2)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

FUNCTION TABLES

abc

INPUTS

OUTPUT

DRIVER STATUS

VALID RIN

DOUT

DIN

FORCEON

FORCEOFF

RS-232 LEVEL

X

X

L

X

Z

Powered off

L

H

H

X

H

Normal operation with

auto-powerdown disabled

H

H

H

X

L

L

L

H

Yes

H

Normal operation with

auto-powerdown enabled

H

L

H

Yes

L

L

L

H

No

Z

Powered off by

auto-powerdown feature

H

L

H

No

Z

(1)

H = high level, L = low level, X = irrelevant, Z = high impedance

abc

INPUTS

OUTPUT

VALID RIN

ROUT

RIN

EN

RS-232 LEVEL

L

L

X

H

H

L

X

L

X

H

X

Z

Open

L

No

H

(1)

H = high level, L = low level, X = irrelevant, Z = high impedance (off),

Open = disconnected input or connected driver off

LOGIC DIAGRAM (POSITIVE LOGIC)

2

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Copyright © 2007, Texas Instruments Incorporated

Product Folder Link(s): TRSF3221