MAXIM MAX3322E, MAX3323E User Manual

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General Description

The MAX3322E/MAX3323E 3.0V to 5.5V powered
EIA/TIA-232 and V.28/V.24 communications interfaces
are designed for multidrop applications with low power
requirements, high data-rate capabilities, and
enhanced electrostatic discharge (ESD) protection. All
RS-232 inputs and outputs are protected to ±15kV
using the IEC 1000-4-2 Air-Gap Discharge method,
±8kV using the IEC 1000-4-2 Contact Discharge
method, and ±15kV using the Human Body Model.

The MAX3322E/MAX3323E have pin-selectable
5kΩ/high-impedance RS-232 receivers. These devices
are capable of receiving data in high-impedance mode.
In multidrop applications, one receiver has a 5kΩ input
resistance, while the other receivers are high imped­ance to ensure the RS-232 standard is observed. Logic
control permits selection of the functional mode: high
impedance or RS-232 standard load. The transmitters
are enabled by logic control to allow the multiplexing of
the inputs to a single UART.

A proprietary low-dropout transmitter output stage
enables true RS-232 performance from a 3.0V to 5.5V
supply with a dual charge pump. The charge pump
requires only four small 0.1µF capacitors for operation
from a 3.3V supply. The MAX3322E/MAX3323E are
capable of running at data rates up to 250kbps while
maintaining RS-232-compliant output levels. The
MAX3322E/MAX3323E have a unique VLpin that allows
operation in mixed-logic voltage systems. Both input
and output logic levels are pin programmable through
the VLpin.

The MAX3322E is a 2Tx/2Rx device for hardware hand­shaking in standard RS-232 mode, and the MAX3323E
is a 1Tx/1Rx, required in most multidrop applications.

The MAX3322E is offered in a space-saving TSSOP
package. The MAX3323E is offered in 16-pin DIP and
space-saving TSSOP packages.

Applications

Bar-Code Scanners

Video Security

Industrial Data Acquisition

Data Splitters

Features

♦ Pin-Selectable 5kΩ/High-Impedance Receivers

♦ Transmitter Outputs Three-Stated by Logic

Control

♦ V

L

Pin for Compatibility with Mixed Voltage

Systems

♦ 1Tx/1Rx (MAX3323E) or 2Tx/2Rx (MAX3322E)

Versions

♦ 250kbps Data Rate

♦ 1µA Low-Power Shutdown

♦ High ESD Protection for RS-232 I/O Pins

±15kV—Human Body Model
±8kV—IEC 1000-4-2 Contact Discharge
±15kV—IEC 1000-4-2 Air-Gap Discharge

MAX3322E/MAX3323E

±15kV ESD-Protected, RS-232 Transceivers for

Multidrop Applications

________________________________________________________________ Maxim Integrated Products 1

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

V

CC

GND

SHDN

V

L

C2+

C1-

V+

C1+

TOP VIEW

RENABLE

TXENABLE

TIN2

ROUT2RIN2

TOUT2

V-

C2-

12

11

9

10

TIN1

ROUT1RIN1

TOUT1

MAX3322E

TSSOP

Pin Configurations

Ordering Information

19-2667; Rev 1; 1/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE

PIN-PACKAGE

MAX3322E EUP -40°C to +85°C 20 TSSOP

MAX3323E EUE -40°C to +85°C 16 TSSOP

MAX3323EEPE -40°C to +85°C 16 DIP

Pin Configurations continued at end of data sheet.

Typical Operating Circuit and Functional Diagram appear
at end of data sheet.

MAX3322E/MAX3323E

±15kV ESD-Protected, RS-232 Transceivers for
Multidrop Applications

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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 in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

All Voltages Referenced to GND
V

CC

, VL....................................................................-0.3V to +6V

V+ (Note 1) ....................................................(V

CC

- 0.3V) to +7V

V- (Note 1) ................................................................+0.3V to -7V

V+ + |V-| (Note 1) .................................................................+13V

Input Voltages

TIN_, RENABLE, TXENABLE,

SHDN .....................-0.3V to +6V

RIN_ ..................................................................................±25V

Output Voltages

TOUT_............................................................................±13.2V

ROUT_........................................................-0.3V to (V

L

+ 0.3V)

Short-Circuit Duration TOUT_ to GND........................Continuous

Continuous Power Dissipation (T

A

= +70°C)

16-Pin DIP (derate 10.5mW/°C above +70°C)............842mW

16-Pin TSSOP (derate 9.4mW/°C above +70°C) ........755mW

20-Pin TSSOP(derate 11mW/°C above +70°C) ..........879mW

Operating Temperature Range

MAX3322E/MAX3323E ...................................-40°C to +85°C

Junction Temperature..................................................... +150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC ELECTRICAL CHARACTERISTICS

(VCC= 3.0V to 5.5V, VL= 1.65V to 5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2 = C3 = C4 = 0.33µF, tested at +5V
±10%; T

A

= T

MIN

to T

MAX

. Typical values are at VCC= VL= 3.3V and TA= +25°C, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

DC CHARACTERISTICS

Supply Current Normal Operation

I

CC

SHDN = VL, no load 1 mA

Supply Current in Shutdown

)

SHDN = 0V, no load 1 10 µA

TRANSMITTER LOGIC INPUTS

Input Logic Threshold Low 0.4 V

VL ≤ 1.8V

Input Logic Threshold High

V

L

> 1.8V

V

Transmitter Input Hysteresis 0.2 V

Input Leakage Current I

IL

±1 µA

LOGIC INPUTS (TXENABLE, RENABLE, SHDN)

Input Logic Threshold Low 0.4 V

Input Logic Threshold High

V

Input Leakage Current

±1 µA

RECEIVER OUTPUTS

Output Leakage Current I

OL

Receivers disabled, SHDN = 0V

µA

I

OUT

= 1.6mA, VL > 1.8V 0.4

Output Voltage Low V

OL

I

OUT

= 1mA, VL ≤ 1.8V 0.4

V

I

OUT

= -1mA, VL > 1.8V

Output Voltage High V

OH

I

OUT

= -500µA, VL ≤ 1.8V

V

RECEIVER INPUTS

Input Voltage Range V

RIN

-25

V

VL = 1.65V

0.6

VL = 3.3V 0.6 1.2Input Threshold Low

V

L

= 5.0V 0.8 1.5

V

Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.

SYMBOL

MIN TYP MAX

I

CC(SHDN

VL - 0.4

2/3 x V

L

2/3 x V

L

VL - 0.4 VL - 0.1

VL - 0.4 VL- 0.1

0.25

±0.01

±0.01

+ 0.05 + 10

+25

MAX3322E/MAX3323E

±15kV ESD-Protected, RS-232 Transceivers for

Multidrop Applications

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.0V to 5.5V, VL= 1.65V to 5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2 = C3 = C4 = 0.33µF, tested at +5V
±10%; T

A

= T

MIN

to T

MAX

. Typical values are at VCC= VL= 3.3V and TA= +25°C, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

VL = 1.65V 1 1.4

VL = 3.3V 1.5 2.4

Input Threshold High

V

L

= 5.0V 1.8 2.4

V

Input Hysteresis

V

RENABLE = 1 3 5 7 kΩ

Input Resistance R

IN

RENABLE = 0 or SHDN = 0V, RIN from -13V
to +13V

1MΩ

TRANSMITTER OUTPUTS

Output Voltage Swing

All transmitter outputs loaded with 3kΩ to
ground

±5

V

Output Resistance

V

CC

= V+ = V- = 0, TOUT_ = ±2V,

TXENABLE = 1

300

Ω

Output Short-Circuit Current V

OUT

= 0V

mA

Output Leakage Current V

OUT

= ±12V, transmitters disabled

µA

ESD PROTECTION

Human Body Model

IEC 1000-4-2 Air-Gap Discharge

RIN, TOUT

IEC 1000-4-2 Contact Discharge ±8

kV

TIMING CHARACTERISTICS

(VCC= 3.0V to 5.5V, VL= 1.65V to 5.5V, C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2 = C3 = C4 = 0.33µF, tested at +5V
±10%; T

A

= T

MIN

to T

MAX

. Typical values are at VCC= VL= 3.3V and TA= +25°C, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

Maximum Data Rate

R

L

= 3kΩ, CL = 1000pF, one transmitter

switching

kbps

t

PHL

Receiver Propagation Delay

t

PLH

RIN_ to ROUT_, CL = 30pF, VL = 3.3V,
Figure 2

ns

t

PHL

0.6

Transmitter Propagation Delay

t

PLH

TIN _ to TO U T_, RL = 3kΩ, C L = 1000p F,
Fi g ur e 1

0.7

µs

Time to Enter Three-State on Tx ( N ote 2) 10 50 µs

Time to Exit Three-State on Tx ( N ote 2) 3 50 µs

Time to Enable Resistor ( N ote 2) 0.4 10 µs

Time to Disable Resistor ( N ote 2) 0.2 10 µs

Time to Enter Shutdown 50 µs

Time to Exit Shutdown 50 µs

Transmitter Skew

ns

Receiver Skew 30 ns

Transition Region Slew Rate

R

L

= 3kΩ to 7kΩ, CL = 1000pF, measured

from +3V to -3V or vice versa

6 30 V/µs

Note 2: Guaranteed by design. Not production tested.

SYMBOL

MIN TYP MAX

0.35

±5.4

10M

±60

±25

±15

±15

SYMBOL

MIN TYP MAX

250

150

180

100

MAX3322E/MAX3323E

±15kV ESD-Protected, RS-232 Transceivers for
Multidrop Applications

4 _______________________________________________________________________________________

Typical Operating Characteristics

(VCC= 3.3V, VL= 3.3V, C1–C4 = 0.1µF, TA= +25°C.)

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3322E toc01

LOAD CAPACITANCE (pF)

OUTPUT VOLTAGE (V)

4000300020001000

-5.0

-2.5

0

2.5

5.0

7.5

-7.5
0 5000

DATA RATE = 250kbps
LOAD = 3kΩ IN PARALLEL WITH C

L

SLEW RATE

vs. LOAD CAPACITANCE

MAX3322E toc02

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

4000300020001000

3

6

9

12

15

18

0

0 5000

SLEW RATE-

SLEW RATE+

TRANSMITTER OUTPUT VOLTAGE

vs. DATA RATE

MAX3322E toc03

DATA RATE (kbps)

OUTPUT VOLTAGE (V)

20015010050

-5.0

-2.5

0

2.5

5.0

7.5

-7.5
0 250

LOAD = 3kΩ, 1000pF
ONE TRANSMITTER
SWITCHING AT DATA
RATE, OTHER
TRANSMITTER
AT 1/8 DATA RATE

SUPPLY CURRENT

vs. LOAD CAPACITANCE

MAX3322E toc04

LOAD CAPACITANCE (pF)

SUPPLY CURRENT (mA)

4000300020001000

10

20

30

40

0

0 5000

250kbps

125kbps

40kbps

LOAD = 3kΩ
ONE TRANSMITTER
SWITCHING AT DATA
RATE, OTHER
TRANSMITTER
AT 1/8 DATA RATE

RECEIVER INPUT RESISTANCE

vs. INPUT VOLTAGE RANGE

MAX3322E toc05

V

RIN

(V)

RECEIVER INPUT RESISTANCE (kΩ)

155-5-15

4.75

5.00

5.25

5.50

4.50

-25 25

RENABLE = 1

RECEIVER INPUT RESISTANCE

vs. INPUT VOLTAGE RANGE

MAX3322E toc06

V

RIN

(V)

RECEIVER INPUT RESISTANCE (MΩ)

155-5-15

1

2

3

4

5

0

-25 25

RENABLE = 0
V

L

= 5V