MAXIM MAX3380E, MAX3381E Technical data

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General Description

The MAX3380E/MAX3381E are +2.35V to +5.5V-pow­ered EIA/TIA-232 and V.28/V.24 communication inter­faces with low power requirements, high data-rate
capabilities, and enhanced electrostatic discharge
(ESD) protection on both the TTL and RS-232 sides.
The MAX3380E/MAX3381E have two receivers and two
transmitters. All RS-232 inputs, outputs, and logic input
pins are protected to ±15kV using IEC 1000-4-2 Air­Gap Discharge method and the Human Body Model,
and ±8kV using IEC 1000-4-2 Contact Discharge
method.

The proprietary low-dropout transmitter output stage
enables true RS-232 performance from a +3.1V to
+5.5V supply with a dual charge pump. The parts
reduce the transmitter output levels to RS-232-compati­ble levels with no increase in supply current for sup­plies less than +3.1V and greater than +2.35V. The
+2.35V to +5.5V operating range is fully compatible
with lithium-ion (Li+) batteries. The charge pump
requires only four small 0.1µF capacitors for operation.

The MAX3380E/MAX3381E transceivers use Maxim’s
revolutionary AutoShutdown Plus™ feature to auto­matically enter a 1µA shutdown mode. These
devices shut down the on-board power supply and
drivers when they do not sense a valid signal transi­tion for 30 seconds on either the receiver or trans­mitter inputs.

The MAX3380E is capable of transmitting data at
rates of 460kbps while maintaining RS-232 output
levels, and the MAX3381E operates at data rates up
to 250kbps. The MAX3381E offers a slower slew rate
for applications where noise and EMI are issues. The
MAX3380E/MAX3381E have a unique V

L

pin that
allows interoperation in mixed-logic voltage systems
down to +1.65V. Both input and output logic levels
are referenced to the V

L

pin. The MAX3380E/MAX3381E

are available in a space-saving TSSOP package.

Applications

Cell Phone Data Lump Cables

PDA Data Lump Cables

GPS Receivers

Digital Cameras

Features

♦ ±15kV ESD Protection on All CMOS and RS-232

Inputs and Outputs (Except INVALID)

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

♦ Operates Over Entire Li+ Battery Range

♦ Low Logic Threshold Down to +1.65V for

Compatibility with Cell Phone Logic Supply Voltages

♦ 1µA Low-Power AutoShutdown Plus Mode

♦ Compatible with Next-Generation GSM Data Rates

♦ 20-Pin TSSOP Package

MAX3380E/MAX3381E

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers

with ±15kV ESD-Protected I/O and Logic Pins

________________________________________________________________ Maxim Integrated Products 1

19-2128; Rev 0; 8/01

Ordering Information

Pin Configuration appears at end of data sheet.

MAX3380E/

MAX3381E

R2OUT

R1OUT

R2IN

GND

RS-232
OUTPUTS

TTL/CMOS

INPUTS

T2IN

T1IN

C2-

C2+

C1-

C1+

R1IN

T2OUT

T1OUT

V-

V+

V

CCVL

C1

0.1µF

C2

0.1µF

C5

0.1µF

+3.3V

RS-232
INPUTS

TTL/CMOS

OUTPUTS

5kΩ

5kΩ

C3

0.1µF

C4

0.1µF

V

L

V

L

FORCEON

FORCEOFF

Typical Operating Circuit

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.

AutoShutdown Plus is a trademark of Maxim Integrated Products

PART TEMP. RANGE PIN-PACKAGE

MAX3380ECUP 0°C to +70°C 20 TSSOP

MAX3380EEUP -40°C to +85°C 20 TSSOP
MAX3381ECUP 0°C to +70°C 20 TSSOP

MAX3381EEUP -40°C to +85°C 20 TSSOP

MAX3380E/MAX3381E

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +2.35V to +5.5V, VL= +1.65V to +5.5V. When VCC< +4.5V, C1 = C2 = C3 = C4 = 0.1µF; when VCC≥ +4.5V, C1 = 0.047µF,
C2 = C3 = C4 = 0.33µF; T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= VL= +3.3V, TA= +25°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 in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

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

V

CC

to GND...........................................................-0.3V to +6.0V

V

L

to GND..............................................................-0.3V to +6.0V

V+ to GND .............................................................-0.3V to +7.0V

V- to GND ..............................................................+0.3V to -7.0V

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

Input Voltages

T_IN, FORCEON, FORCEOFF to GND...............-0.3V to +6.0V

R_IN to GND .....................................................................±25V

Output Voltages

T_OUT to GND...............................................................±13.2V

R_OUT, INVALID to GND...........................-0.3V to (V

L

+ 0.3V)

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

Continuous Power Dissipation (T

A

= +70°C)

20-Pin TSSOP (derate 10.9mW/°C over +70°C) .........879mW

Operating Temperature Ranges

MAX3380ECUP/MAX3381ECUP........................0°C to +70°C

MAX3380EEUP/MAX3381EEUP .....................-40°C to +85°C

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

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

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Current, AutoShutdown
Plus

Receivers idle, VT_IN = VCC or GND,

I

CC

FORCEON = GND, FORCEOFF = V
FORCEOFF = GND 1 10

CC

10

µA

Supply Current, Normal Operation I

LOGIC INPUTS (T_IN, FORCEON, FORCEOFF)

Input Logic Threshold Low V

Input Logic Threshold High V

Transmitter Input Hysteresis 0.5 V

Input Leakage Current ±0.01 ±1µA

RECEIVER OUTPUTS (R_OUT) AND INVALID

Output Voltage Low I

Output Voltage High I

RECEIVER INPUTS (R_IN)

Input Voltage Range -25 +25 V

Input Threshold Low TA = +25°C

Input Threshold High TA = +25°C

Input Hysteresis 0.3 V

Input Resistance TA = +25°C 357kΩ

CC

FORCEON = FORCEOFF = VL, no load 0.3 1 mA

VCC = +5.5V, VL = +5.5V 0.4 1.2

IL

VCC = +2.5V, VL = +1.65V 0.4

VCC = +5.5V, VL = +5.5V VL ✕ 0.66

IH

VCC = +2.5V, VL = +1.65V VL ✕ 0.66

= 500µA 0.5 V

OUT

= -500µA VL - 0.4 VL - 0.2 V

OUT

VL = +3.3V 0.6 1.2

V

= +5.0V 0.8 1.5

L

VL = +3.3V 1.5 2.4

V

= +5.0V 1.8 2.4

L

V

V

V

V

MAX3380E/MAX3381E

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers

with ±15kV ESD-Protected I/O and Logic Pins

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.35V to +5.5V, VL= +1.65V to +5.5V. When VCC< +4.5V, C1 = C2 = C3 = C4 = 0.1µF; when VCC≥ +4.5V, C1 = 0.047µF,
C2 = C3 = C4 = 0.33µF; T

A

= T

MIN

to T

MAX

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

AutoShutdown Plus (FORCEON = GND, FORCEOFF = VL)

Receiver Input Threshold to
INVALID Output High

Receiver Input Threshold to
INVALID Output Low

Receiver Positive or Negative
Threshold to INVALID High

Receiver Positive or Negative
Threshold to INVALID Low

Receiver or Transmitter Edge to
Transmitters Enabled

Receiver or Transmitter Edge to
Transmitters Shutdown

TRANSMITTER OUTPUTS

VCC Mode Switch Point
(V

Falling)

CC

VCC Mode Switch Point

Rising)

(V

CC

VCC Mode Switch Point
Hysteresis

Output Voltage Swing

Output Resistance VCC = 0, transmitter output = ±2.0V 300 10M Ω

Output Short-Circuit Current ±60 mA

Output Leakage Current V

ESD PROTECTION

R_IN, T_OUT, R_OUT, T_IN,
FORCEON, FORCEOFF

Figure 3

Figure 3 -0.3 0.3 V

t

INVL

t

INVH

t

WU

t

AU T OS H D N VCC

VCC = +5.0V, Figure 4 0.3 µs

VCC = +5.0V, Figure 4 30 µs

VCC = +5.0V, Figure 4 15 µs

T_OUT = ±5.0V to ±3.7V 2.95 3.1 3.25 V

T_OUT = ±3.7V to ±5.5V 3.3 3.5 3.7 V

All transmitter
outputs loaded
with 3kΩ to ground

Human Body Model ±15

IEC 1000-4-2 Air-Gap Discharge Method ±15

IEC 1000-4-2 Contact Discharge Method ±8

= +5.0V, Figure 4 30 s

= ±12V, transmitters disabled ±25 µA

OUT

Positive threshold 2.7

Negative threshold -2.7

V

= + 3.25V to + 5.5V ,

C C

fal l i ng

V

C C

= + 2.5V to + 2.95V ,

V

C C

fal l i ng

V

C C

±5 ±5.4

±3.7

V

400 mV

V

kV

-6

-2

-4

2

0

6

4

8

0 1000 1500500 2000 2500 3000

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3380E toc01

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

V

OUT+

V

OUT-

VCC = +4.2V

-6

-2

-4

2

0

6

4

8

0 1000 1500500 2000 2500 3000

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3380E toc02

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE (V)

V

OUT+

V

OUT-

VCC = +2.5V

0

5

10

15

20

25

30

35

40

0 1000500 1500 2000 2500 3000

MAX3380E

SLEW RATE vs. LOAD CAPACITANCE

MAX3380E toc03

LOAD CAPACITANCE (pF)

SLEW RATE (V/µs)

VCC = +4.2V

VCC = +2.5V

Typical Operating Characteristics

(VCC= VL= +4.2V, C1 = 0.22µF, C2 = C3 = C4 = 1µF, C5 = 0.1µF parallel with 47µF, RL= 3kΩ, CL= 1000pF, data rate is 250kbps,
TA= +25°C, unless otherwise noted.)

MAX3380E/MAX3381E

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins

4 _______________________________________________________________________________________

TIMING CHARACTERISTICS

(VCC= +2.35V to +5.5V, VL= +1.65V to +5.5V. When VCC< +4.5V, C1 = C2 = C3 = C4 = 0.1µF; when VCC≥ +4.5V, C1 = 0.047µF,
C2 = C3 = C4 = 0.33µF; T

A

= T

MIN

to T

MAX

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

Note 2: Transmitter skew is measured at the transmitter zero crosspoint.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX

Maximum Data Rate

Receiver Propagation Delay

Transmitter Skew t
Receiver Skew t

Transition Region Slew Rate
(MAX3380E)

Transition Region Slew Rate
(MAX3381E)

Transition Region Slew Rate
(MAX3380E)

Transition Region Slew Rate
(MAX3381E)

UNITS

MAX3381E 250

MAX3380E 460

20 100 V/µs

6 30 V/µs

kbps

0.15

0.15

30 V/µs

10 V/µs

PHL

PHL

R

= 3kΩ, CL = 1000pF, one

L

transmitter switching

t

PLH

t

PHL

- t

- t

Receiver input to receiver output, CL = 100pF

 (Note 2) 200 ns

PLH

 50 ns

PLH

VCC = +4.2V, -3.0V < T_OUT< +3.0V,

= 3kΩ, CL = 250pF to 1000pF, TA = +25°C

R

L

VCC = +4.2V, -3.0V < T_OUT< +3.0V,

= 3kΩ, CL = 150pF to 1000pF, TA = +25°C

R

L

VCC = +2.35V, -3.0V < T_OUT< +3.0V,

= 3kΩ, CL = 250pF to 1000pF, TA = +25°C

R

L

VCC = +2.35V, -3.0V < T_OUT< +3.0V,
R

= 3kΩ, CL = 250pF to 1000pF, TA = +25°C

L

µs

MAX3380E/MAX3381E

+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers

with ±15kV ESD-Protected I/O and Logic Pins

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(VCC= VL= +4.2V, C1 = 0.22µF, C2 = C3 = C4 = 1µF, C5 = 0.1µF parallel with 47µF, RL= 3kΩ, CL= 1000pF, data rate is 250kbps,
T

A

= +25°C, unless otherwise noted.)

SLEW RATE vs. LOAD CAPACITANCE

MAX3381E

14

13

12

11

10

9

SLEW RATE (V/µs)

8

7

6

0 1000500 1500 2000 2500 3000

VCC = +4.2V

VCC = +2.5V

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE (V

8

6

V

OUT+

4

2

MAX3380E toc04

SUPPLY CURRENT vs. LOAD CAPACITANCE

WHEN TRANSMITTING DATA

80

1 TRANSMITTER SWITCHING

70

60

50

40

30

SUPPLY CURRENT (mA)

20

10

0

01000500 1500 2000 2500 3000

LOAD CAPACITANCE (pF)

RISING)

CC

MAX3380E toc07

460kbps

MAX3381E toc05

250kbps

20kbps

SUPPLY CURRENT

vs. SUPPLY VOLTAGE (V

25

1 TRANSMITTER SWITCHING

20

15

TRANSMITTER OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE (V

8

6

V

OUT+

4

2

0

-2

V

OUT-

TRANSMITTER OUTPUT VOLTAGE (V)

-4

-6

2.5 3.5 4.5 5.5

FALLING)

CC

SUPPLY VOLTAGE (V)

CC

MAX3380E toc08

FALLING)

MAX3380E toc06

0

-2

V

TRANSMITTER OUTPUT VOLTAGE (V)

OUT-

-4

-6

2.5 3.5 4.5 5.5
SUPPLY VOLTAGE (V)

MAX3380E

1µs/div

= +4.2V

CC

DATASTREAM V

T_IN

5V/div

T_OUT

5V/div

MAX3380E toc09

5V

0

5V

0

-5V

10

SUPPLY CURRENT (mA)

5

0

2.5 3.5 4.5 5.5
SUPPLY VOLTAGE (V)

MAX3380E

1µs/div

= +2.5V

CC

T_IN

5V/div

T_OUT

5V/div

DATASTREAM V

VCC = V

+2.5V

L =

MAX3380E toc10

5V

0

5V

0

-5V