background image

MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

1

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

D

Single-Chip and Single-Supply Interface for

IBM

 PC/AT

 Serial Port

D

Meets or Exceeds the Requirements of

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

D

Operates With 3-V to 5.5-V V

CC

 Supply

D

Always-Active Noninverting Receiver

Output (ROUT2B)

D

Operates up to 250 kbit/s

D

Low Standby Current . . . 1 

µ

A Typical

D

External Capacitors . . . 4 

×

 0.1 

µ

F

D

Accepts 5-V Logic Input With 3.3-V Supply

D

Designed to Be Interchangeable With

Maxim MAX3243

D

Serial-Mouse Driveability

D

RS-232 Bus-Pin ESD Protection Exceeds

±

15-kV Using Human-Body Model (HBM)

D

Applications

–  Battery-Powered Systems, PDAs,

Notebooks, Laptops, Palmtop PCs, and

Hand-Held Equipment

D

Package Options Include Plastic

Small-Outline (DW), Shrink Small-Outline

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

Packages

description

The MAX3243 device

 

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

±

15-kV ESD protection pin-to-pin (serial-port connection pins, including GND). 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/

µ

s 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

µ

A.

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

PRODUCT PREVIEW

Copyright 

©

 2000, Texas Instruments Incorporated

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.

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.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

C2+

C2–

V–

RIN1

RIN2

RIN3

RIN4

RIN5

DOUT1

DOUT2

DOUT3

DIN3

DIN2

DIN1

C1+

V+

V

CC

GND

C1–

FORCEON

FORCEOFF

INVALID

ROUT2B

ROUT1

ROUT2

ROUT3

ROUT4

ROUT5

DB, DW, OR PW PACKAGE

(TOP VIEW)

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

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MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

2

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

description (continued)

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 

µ

s. INVALID is low (invalid data) if all receiver input

voltages are between –0.3 V and 0.3 V for more than 30 

µ

s. Refer to Figure 5 for receiver input levels.

The MAX3243C is characterized for operation from 0

°

C to 70

°

C. The MAX3243I is characterized for operation

from –40

°

C to 85

°

C.

AVAILABLE OPTIONS

PACKAGED DEVICES

TA

SHRINK

SMALL OUTLINE

(DB)

SMALL OUTLINE

(DW)

THIN SHRINK

SMALL OUTLINE

(PW)

0

°

C to 70

°

C

MAX3243CDB

MAX3243CDW

MAX3243CPW

– 40

°

C to 85

°

C

MAX3243IDB

MAX3243IDW

MAX3243IPW

The DB, DW, and PW packages are available taped and reeled. Add the suffix R to

device type (e.g., MAX3243CDBR).

Function Tables

EACH DRIVER

INPUTS

OUTPUT

DIN

FORCEON

FORCEOFF

VALID RIN

RS-232 LEVEL

OUTPUT

DOUT

DRIVER STATUS

X

X

L

X

Z

Powered off

L

H

H

X

H

Normal operation with

H

H

H

X

L

auto-powerdown disabled

L

L

H

Yes

H

Normal operation with

H

L

H

Yes

L

auto-powerdown enabled

L

L

H

No

Z

Powered off by

H

L

H

No

Z

y

auto-powerdown feature

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

EACH RECEIVER

INPUTS

OUTPUTS

RIN2

RIN1,

RIN3–RIN5

FORCEOFF

VALID RIN

RS-232 LEVEL

ROUT2B

ROUT

RECEIVER STATUS

L

X

L

X

L

Z

Powered off while

H

X

L

X

H

Z

ROUT2B is active

L

L

H

Yes

L

H

L

H

H

Yes

L

L

Normal operation with

H

L

H

Yes

H

H

Normal o eration with

auto-powerdown

di

bl d/

bl d

H

H

H

Yes

H

L

disabled/enabled

Open

Open

H

No

L

H

H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or connected

driver off

PRODUCT PREVIEW

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MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

3

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

logic diagram (positive logic)

DIN3

DIN2

DIN1

DOUT3

DOUT2

DOUT1

Auto-powerdown

INVALID

RIN1

RIN2

RIN3

RIN4

RIN5

FORCEOFF

FORCEON

ROUT1

ROUT2B

ROUT2

ROUT3

ROUT4

ROUT5

14

13

12

22

23

19

20

18

17

16

15

9

10

11

21

4

5

6

7

8

PRODUCT PREVIEW

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MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

4

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

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

Supply voltage range, V

CC

 (see Note 1) 

–0.3 V to 6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Positive output supply voltage range, V+ (see Note 1) 

–0.3 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Negative output supply voltage range, V– (see Note 1) 

0.3 V to –7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Supply voltage difference, V+

 

 

V– (see Note 1) 

13 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Input voltage range, V

I

: Driver (FORCEOFF, FORCEON) 

–0.3 V to 6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Receiver 

–25 V to 25 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Output voltage range, V

O

: Driver 

–13.2 V to 13.2 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Receiver (INVALID) 

–0.3 V to V

CC

 + 0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Package thermal impedance, 

θ

JA

 (see Note 2): DB package 

62

°

C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DW package 

46

°

C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

PW package 

62

°

C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 

260

°

C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Storage temperature range, T

stg

 –65

°

C to 150

°

C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

† 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.

NOTES:

1. All voltages are with respect to network GND.

2. The package thermal impedance is calculated in accordance with JESD 51.

recommended operating conditions (see Note 3 and Figure 6)

MIN

NOM

MAX

UNIT

Supply voltage

VCC = 3.3 V

3

3.3

3.6

V

Supply voltage

VCC = 5 V

4.5

5

5.5

V

VIH

Driver and control high level input voltage

DIN FORCEOFF FORCEON

VCC = 3.3 V

2

V

VIH

Driver and control high-level input voltage

DIN, FORCEOFF, FORCEON

VCC = 5 V

2.4

V

VIL

Driver and control low-level input voltage

DIN, FORCEOFF, FORCEON

0.8

V

VI

Driver and control input voltage

DIN, FORCEOFF, FORCEON

0

5.5

V

VI

Receiver input voltage

–25

25

V

TA

Operating free-air temperature

MAX3243C

0

70

°

C

TA

O erating free-air tem erature

MAX3243I

–40

85

°

C

NOTE 3: Test conditions are C1–C4 = 0.1 

µ

F at VCC = 3.3 V 

±

0.3 V; C1 = 0.047 

µ

F, C2–C4 = 0.33 

µ

F at VCC = 5 V 

±

0.5 V.

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Note 3 and Figure 6)

PARAMETER

TEST CONDITIONS

MIN

TYP‡

MAX

UNIT

II

Input leakage current

FORCEOFF, FORCEON

±

0.01

±

1

µ

A

Auto-powerdown disabled

No load,

FORCEOFF and FORCEON at VCC

0.3

1

mA

ICC

Supply current

Powered off

No load, FORCEOFF at GND

1

10

ICC

Su

ly current

Auto-powerdown enabled

No load, FORCEOFF at VCC,

FORCEON at GND,

All RIN are open or grounded

1

10

µ

A

‡ All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25

°

C.

NOTE 3. Test conditions are C1–C4 = 0.1 

µ

F at VCC = 3.3 V 

±

0.3 V; C1 = 0.047 

µ

F, C2–C4 = 0.33 

µ

F at VCC = 5 V 

±

0.5 V.

PRODUCT PREVIEW

background image

MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

5

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

DRIVER SECTION

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Note 3 and Figure 6)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VOH

High-level output voltage

All DOUT at RL = 3 k

Ω 

to GND

5

5.4

V

VOL

Low-level output voltage

All DOUT at RL = 3 k

Ω 

to GND

–5

–5.4

V

VO

Output voltage 

(mouse driveability)

DIN1 = DIN2 = GND, DIN3 = VCC,

3-k

 to GND at DOUT3,

DOUT1 = DOUT2 = 2.5 mA

±

5

V

IIH

High-level input current

VI = VCC

±

0.01

±

1

µ

A

IIL

Low-level input current

VI at GND

±

0.01

±

1

µ

A

IOS

Short circ it o tp t c rrent‡

VCC = 3.6 V,

VO = 0 V

±

35

±

60

mA

IOS

Short-circuit output current‡

VCC = 5.5 V,

VO = 0 V

±

35

±

60

mA

ro

Output resistance

VCC, V+, and V– = 0 V,

VO = 

±

2 V

300

10M

Ioff

Output leakage current

FORCEOFF = GND,

VO = 

±

12 V,

VCC = 0 to 5.5 V

±

25

µ

A

† All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25

°

C.

‡ Short-circuit durations should be controlled to prevent exceeding the device absolute power dissipation ratings, and not more than one output

should be shorted at a time.

NOTE 3. Test conditions are C1–C4 = 0.1 

µ

F at VCC = 3.3 V 

±

0.3 V; C1 = 0.047 

µ

F, C2–C4 = 0.33 

µ

F at VCC = 5 V 

±

0.5 V.

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Note 3 and Figure 6)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

Maximum data rate

CL = 1000 pF,

One DOUT switching,

RL = 3 k

Ω,

See Figure 1

250

kbit/s

tsk(p)

Pulse skew§

CL = 150 pF to 2500 pF

RL = 3 k

 to 7 k

Ω,

See Figure 2

100

ns

SR(tr)

Slew rate, transition region

VCC = 3.3 V

,

CL = 150 pF to 1000 pF

6

30

V/

µ

s

SR(tr)

g

(see Figure 1)

CC

RL = 3 k

 to 7 k

CL = 150 pF to 2500 pF

4

30

V/

µ

s

† All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25

°

C.

§ Pulse skew is defined as |tPLH – tPHL| of each channel of the same device.

NOTE 3. Test conditions are C1–C4 = 0.1 

µ

F at VCC = 3.3 V 

±

0.3 V; C1 = 0.047 

µ

F, C2–C4 = 0.33 

µ

F at VCC = 5 V 

±

0.5 V.

PRODUCT PREVIEW

background image

MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

6

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

RECEIVER SECTION

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Note 3 and Figure 6)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VOH

High-level output voltage

IOH = –1 mA

VCC – 0.6 V

VCC – 0.1 V

V

VOL

Low-level output voltage

IOL = 1.6 mA

0.4

V

VIT

Positive going input threshold voltage

VCC = 3.3 V

1.6

2.4

V

VIT+

Positive-going input threshold voltage

VCC = 5 V

1.9

2.4

V

VIT

Negative going input threshold voltage

VCC = 3.3 V

0.6

1.1

V

VIT–

Negative-going input threshold voltage

VCC = 5 V

0.8

1.4

V

Vhys

Input hysteresis (VIT+ – VIT–)

0.5

V

Ioff

Output leakage current (except ROUT2B)

FORCEOFF = 0 V

±

0.05

±

10

µ

A

ri

Input resistance

VI =

 ±

3 V to 

±

25 V

3

5

7

k

† All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25

°

C.

NOTE 3. Test conditions are C1–C4 = 0.1 

µ

F at VCC = 3.3 V 

±

0.3 V; C1 = 0.047 

µ

F, C2–C4 = 0.33 

µ

F at VCC = 5 V 

±

0.5 V.

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Note 3)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

tPLH

Propagation delay time, low- to high-level output

CL = 150 pF See Figure 3

150

ns

tPHL

Propagation delay time, high- to low-level output

CL = 150 pF, See Figure 3

150

ns

ten

Output enable time

CL = 150 pF RL = 3 k

See Figure 4

200

ns

tdis

Output disable time

CL = 150 pF, RL = 3 k

Ω, 

See Figure 4

200

ns

tsk(p)

Pulse skew‡

See Figure 3

50

ns

† All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25

°

C.

‡ Pulse skew is defined as |tPLH – tPHL| of each channel of the same device.

NOTE 3. Test conditions are C1–C4 = 0.1 

µ

F at VCC = 3.3 V 

±

0.3 V; C1 = 0.047 

µ

F, C2–C4 = 0.33 

µ

F at VCC = 5 V 

±

0.5 V.

PRODUCT PREVIEW

background image

MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

7

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

AUTO-POWERDOWN SECTION

electrical characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 5)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

VT+(valid)

Receiver input threshold

for INVALID high-level output voltage

FORCEON = GND,

FORCEOFF = VCC

2.7

V

VT–(valid)

Receiver input threshold

for INVALID high-level output voltage

FORCEON = GND,

FORCEOFF = VCC

–2.7

V

VT(invalid)

Receiver input threshold

for INVALID low-level output voltage

FORCEON = GND,

FORCEOFF = VCC

–0.3

0.3

V

VOH

INVALID high-level output voltage

IOH = –1 mA, FORCEON = GND,

FORCEOFF = VCC

VCC – 0.6

V

VOL

INVALID low-level output voltage

IOL = 1.6 mA, FORCEON = GND,

FORCEOFF = VCC

0.4

V

† All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25

°

C.

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 5)

PARAMETER

MIN

TYP†

MAX

UNIT

tvalid

Propagation delay time, low- to high-level output

1

µ

s

tinvalid

Propagation delay time, high- to low-level output

30

µ

s

ten

Supply enable time

100

µ

s

† All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25

°

C.

PARAMETER MEASUREMENT INFORMATION

50 

TEST CIRCUIT

VOLTAGE WAVEFORMS

–3 V

–3 V

3 V

3 V

0 V

3 V

Output

Input

VOL

VOH

tTLH

Generator

(see Note B)

RL

3 V

FORCEOFF

RS-232

Output

tTHL

CL 

(see Note A)

SR(tr)

+

6 V

t

THL

or t

TLH

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 

, 50% duty cycle, tr 

10 ns, tf 

 10 ns.

Figure 1. Driver Slew Rate

PRODUCT PREVIEW

background image

MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

8

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

50 

TEST CIRCUIT

VOLTAGE WAVEFORMS

0 V

3 V

Output

Input

VOL

VOH

tPLH

Generator

(see Note B)

RL

3 V

FORCEOFF

RS-232

Output

tPHL

CL 

(see Note A)

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 

, 50% duty cycle, tr 

10 ns, tf 

 10 ns.

50%

50%

1.5 V

1.5 V

Figure 2. Driver Pulse Skew 

TEST CIRCUIT

VOLTAGE WAVEFORMS

50 

–3 V

3 V

Output

Input

VOL

VOH

tPHL

Generator

(see Note B)

tPLH

Output

CL 

(see Note A)

3 V or 0 V

FORCEON

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: ZO = 50 

, 50% duty cycle, tr 

 10 ns, tf 

 10 ns.

3 V

FORCEOFF

1.5 V

1.5 V

50%

50%

Figure 3. Receiver Propagation Delay Times

TEST CIRCUIT

VOLTAGE WAVEFORMS

50 

Generator

(see Note B)

3 V or 0 V

Output

VOL

VOH

tPZH

(S1 at GND)

3 V

–3 V

0.3 V

Output

Input

0.3 V

3 V or 0 V

FORCEON

FORCEOFF

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: ZO = 50 

, 50% duty cycle, tr 

 10 ns, tf 

 10 ns.

C. tPLZ and tPHZ are the same as tdis.

D. tPZL and tPZH are the same as ten.

1.5 V

1.5 V

50%

tPHZ

(S1 at GND)

tPLZ

(S1 at VCC)

50%

tPZL

(S1 at VCC)

RL

S1

VCC

GND

CL

(see Note A)

Output

Figure 4. Receiver Enable and Disable Times

PRODUCT PREVIEW

background image

MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

9

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

TEST CIRCUIT

VOLTAGE WAVEFORMS

50 

3 V

2.7 V

–2.7 V

INVALID

Output

Receiver

Input

Generator

(see Note B)

FORCEOFF

tvalid

ROUT

FORCEON

Auto-

powerdown

INVALID

DOUT

0 V

0 V

–3 V

DIN

CL = 30 pF

(see Note A)

VCC

0 V

ÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎ

ÎÎÎÎÎÎÎÎÎÎÎÎ

2.7 V

–2.7 V

0.3 V

–0.3 V

0 V

Valid RS-232 Level, INVALID High

Indeterminate

Indeterminate

If Signal Remains Within This Region

For More Than 30 

µ

s, INVALID Is Low†

Valid RS-232 Level, INVALID High

† Auto-powerdown disables drivers and reduces

supply current to 1 

µ

A.

V+

0 V

V–

V+

VCC

ten

V–

NOTES: A. CL includes probe and jig capacitance.

B. The pulse generator has the following characteristics: PRR = 5 kbit/s, ZO = 50 

, 50% duty cycle, tr 

 10 ns, tf 

 10 ns.

50% VCC

50% VCC

2.7 V

–2.7 V

0.3 V

0.3 V

tinvalid

Supply

Voltages

Figure 5. INVALID Propagation Delay Times and Supply Enabling Time

PRODUCT PREVIEW

background image

MAX3243

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

SLLS350B – APRIL 1999 – REVISED JANUARY 2000

10

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

APPLICATION INFORMATION

RIN4

DOUT2

DOUT3

ROUT1

FORCEOFF

RIN5

INVALID

ROUT2

DOUT1

ROUT2B

DIN3

DIN2

ROUT3

ROUT4

DIN1

ROUT5

C4

+

+

C3†

VCC

C2+

C2–

C1

C1+

GND

V–

C1–

FORCEON

C2

+

CBYPASS

= 0.1 

µ

F

V+

+

+

RIN1

RIN2

RIN3

RS-232 Inputs

Logic Outputs

Logic Inputs

RS-232 Outputs

VCC

C1

C2, C3, and C4

3.3 V 

±

 0.3 V

5 V 

±

 0.5 V

3 V to 5.5 V

0.1 

µ

F

0.047 

µ

F

0.1 

µ

F

0.1 

µ

F

0.33 

µ

F

0.47 

µ

F

† C3 can be connected to VCC or GND.

NOTE A: Resistor values shown are nominal.

VCC vs CAPACITOR VALUES

Auto-

powerdown

1

2

4

5

6

7

8

9

10

11

12

13

14

3

28

27

26

25

24

23

22

21

20

19

18

17

16

15

5 k

5 k

5 k

5 k

5 k

Figure 6. Typical Operating Circuit and Capacitor Values

PRODUCT PREVIEW

background image

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 2000, Texas Instruments Incorporated