TI-TRS3243E.pdf资源-CSDN文库

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C2+

C2−

V−

RIN1

RIN2

RIN3

RIN4

RIN5

DOUT1

DOUT2

DOUT3

DIN3

DIN2

DIN1

C1+

V+

GND

C1−

FORCEON

FORCEOFF

INVALID

ROUT2B

ROUT1

ROUT2

ROUT3

ROUT4

ROUT5

DB, DW, OR PW PACKAGE

(TOP VIEW)

QFN PACKAGE

(TOP VIEW)

GND

C1–

FORCEON

FORCEOFF

INVALID

ROUTB2

ROUT1

ROUT2

RIN1

RIN2

RIN3

RIN4

RIN5

DOUT1

DOUT2

DOUT3

N.C.

V–

C2–

C2+

C1+

V+

N.C.

DIN3

DIN2

DIN1

ROUT5

ROUT4

ROUT3

N.C.

3132 30 29 28 27 26 25

109 11 12 13 14 15 16

N.C. − Not internally connected

TRS3243E

www.ti.com

SLLS789C –APRIL 2007– REVISED SEPTEMBER 2011

3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER

WITH ±15-kV IEC ESD PROTECTION

Check for Samples: TRS3243E

FEATURES

• Single-Chip and Single-Supply Interface for

IBM™ PC/AT™ Serial Port

• ESD Protection for RS-232 Bus Pins

– ±15-kV Human-Body Model (HBM)

– ±8-kV IEC61000-4-2, Contact Discharge

– ±15-kV IEC61000-4-2, Air-Gap Discharge

• Meets or Exceeds Requirements of

TIA/EIA-232-F and ITU v.28 Standards

• Operates With 3-V to 5.5-V V

Supply

• Always-Active Noninverting Receiver Output

(ROUT2B)

• Designed to Transmit at a Data Rate up to

500 kbit/s

• Low Standby Current . . . 1 μA Typ

• External Capacitors . . . 4 × 0.1 μF

• Accepts 5-V Logic Input With 3.3-V Supply

• Designed to Be Interchangeable With Industry

Standard '3243E Devices

• Serial-Mouse Driveability

• Auto-Powerdown Feature to Disable Driver

Outputs When No Valid RS-232 Signal Is

Sensed

• Package Options Include Plastic Small-Outline

(DW), Shrink Small-Outline (DB), and Thin

Shrink Small-Outline (PW) Packages

APPLICATIONS

• Battery-Powered Systems

• PDAs

• Notebooks

• Laptops

• Palmtop PCs

• Hand-Held Equipment

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2IBM, PC/AT are trademarks of International Business Machines Corporation.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

TRS3243E

SLLS789C –APRIL 2007– REVISED SEPTEMBER 2011

www.ti.com

DESCRIPTION/ORDERING INFORMATION

The TRS3243E device consists of three line drivers, five line receivers, and a dual charge-pump circuit with

±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge)

protection on serial-port connection pins. The device meets the requirements of TIA/EIA-232-F and provides the

electrical interface between an asynchronous communication controller and the serial-port connector. This

combination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, or

compatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V

supply. In addition, the device includes an always-active noninverting output (ROUT2B), which allows

applications using the ring indicator to transmit data while the device is powered down. The device operates at

data signaling rates up to 250 kbit/s and a maximum of 30-V/μs driver output slew rate.

Flexible control options for power management are available when the serial port is inactive. The

auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of

operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is

set low, both drivers and receivers (except ROUT2B) are shut off, and the supply current is reduced to 1 μA.

Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur.

Auto-powerdown can be disabled when FORCEON and FORCEOFF are high, and should be done when driving

a serial mouse. With auto-powerdown enabled, the device is activated automatically when a valid signal is

applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any

receiver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V

or has been between –0.3 V and 0.3 V for less than 30 μs. INVALID is low (invalid data) if all receiver input

voltages are between –0.3 V and 0.3 V for more than 30 μs. Refer to Figure 5 for receiver input levels.

The TRS3243EC is characterized for operation from 0°C to 70°C. The TRS3243EI is characterized for operation

from –40°C to 85°C.

Table 1. ORDERING INFORMATION

PACKAGE

(1)

ORDERABLE PART NUMBER TOP-SIDE MARKING

SSOP – DB Reel of 2000 TRS3243ECDBR TRS3243EC

SOP – DW Reel of 2000 TRS3243ECDWR TRS3243EC

0°C to 70°C

TSSOP – PW Reel of 2000 TRS3243ECPWR RS43EC

QFN – RHB Reel of 2000 TRS3243ECRHBR RS43EC

SSOP – DB Reel of 2000 TRS3243EIDBR TRS3243ECI

SOP – DW Reel of 2000 TRS3243EIDWR TRS3243ECI

–40°C to 85°C

TSSOP – PW Reel of 2000 TRS3243EIPWR RS43EI

QFN – RHB Reel of 2000 TRS3243EIRHBR RS43EI

(1) 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.

Product Folder Link(s): TRS3243E

TRS3243E

www.ti.com

SLLS789C –APRIL 2007– REVISED SEPTEMBER 2011

Absolute Maximum Ratings

(1)

over operating free-air temperature range (unless otherwise noted)

MIN MAX UNIT

Supply voltage range

(2)

–0.3 6 V

V+ Positive output supply voltage range

(2)

–0.3 7 V

V– Negative output supply voltage range

(2)

0.3 –7 V

V+ – V– Output supply voltage difference

(2)

13 V

Driver (FORCEOFF, FORCEON) –0.3 6

Input voltage range V

Receiver –25 25

Driver –13.2 13.2

Output voltage range V

Receiver (INVALID) –0.3 V

+ 0.3

DB package 62

Package thermal impedance

(3) (4)

DW package 46 °C/W

PW package 62

Lead temperature 1,6 mm (1/16 in) from case for 10 s 260 °C

stg

Storage temperature range –65 150 °C

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating

conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) All voltages are with respect to network GND.

(3) Maximum power dissipation is a function of T

(max), θ

, and T

. The maximum allowable power dissipation at any allowable ambient

temperature is P

= (T

(max) - T

)/θ

. Operating at the absolute maximum T

of 150°C can affect reliability.

(4) The package thermal impedance is calculated in accordance with JESD 51-7.

Recommended Operating Conditions

(1)

See Figure 6

MIN NOM MAX UNIT

= 3.3 V 3 3.3 3.6

Supply voltage V

= 5 V 4.5 5 5.5

= 3.3 V 2

Driver and control high-level input voltage DIN, FORCEOFF, FORCEON V

= 5 V 2.4

Driver and control low-level input voltage DIN, FORCEOFF, FORCEON 0.8 V

Driver and control input voltage DIN, FORCEOFF, FORCEON 0 5.5 V

Receiver input voltage –25 25 V

TRS3243EC 0 70

Operating free-air temperature °C

TRS3243EI –40 85

(1) Test conditions are C1–C4 = 0.1 μF at V

= 3.3 V ± 0.3 V; C1 = 0.047 μF, C2–C4 = 0.33 μF at V

= 5 V ± 0.5 V.

Electrical Characteristics

(1)

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 6)

PARAMETER TEST CONDITIONS MIN TYP

(2)

MAX UNIT

Input leakage current FORCEOFF, FORCEON ±0.01 ±1 μA

No load,

Auto-powerdown disabled 0.3 1 mA

FORCEOFF and FORCEON at V

Powered off No load, FORCEOFF at GND 1 10

Supply current

No load, FORCEOFF at V

= 25°C)

μA

FORCEON at GND,

Auto-powerdown enabled 1 10

All RIN are open or grounded,

All DIN are grounded

(1) Test conditions are C1–C4 = 0.1 μF at V

= 3.3 V ± 0.3 V; C1 = 0.047 μF, C2–C4 = 0.33 μF at V

= 5 V ± 0.5 V.

(2) All typical values are at V

= 3.3 V or V

= 5 V, and T

= 25°C.

Product Folder Link(s): TRS3243E

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