MAXIM MAX3188E, MAX3189E User Manual

General Description

The MAX3188E/MAX3189E single RS-232 transmitters
in a SOT23-6 package are for space- and cost-con­strained applications requiring minimal RS-232 commu­nications. These devices consume only 150µA of
supply current from ±4.5V to ±6V supplies. They fea­ture a shutdown input that reduces current consump­tion to only 1µA and forces the transmitter output into a
high-impedance state. RS-232 data transmission is guar­anteed up to 250kbps with the MAX3188E and up to
1Mbps with the MAX3189E.

The MAX3188E/MAX3189E are EIA/TIA-232 transmitters
that convert CMOS/TTL logic levels to RS-232-compliant
signals. The transmitter output is protected to ±15kV
using the IEC 1000-4-2 Air-Gap Discharge method, to
±8kV using the IEC 1000-4-2 Contact Discharge
method, and to ±15kV per the Human Body Model,
ensuring strict compliance with international standards.
The MAX3188E/MAX3189E transmitters have a standard
inverting output.

Applications

Diagnostic Ports

Telecommunications

Networking Equipment

Set-Top Boxes

Digital Cameras

Hand-Held Equipment

Features

♦ Small 6-Pin SOT23 Package

♦ ESD-Protected RS-232 Output

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

♦ 150µA Operating Supply Current

♦ Shutdown Reduces Supply Current to 1µA

♦ Guaranteed Data Rate

1Mbps (MAX3189E)
250kbps (MAX3188E)

♦ Three-State RS-232 Transmitter Output

♦ No External Components

MAX3188E/MAX3189E

±15kV ESD-Protected, 1Mbps, 1µA

RS-232 Transmitters in SOT23-6

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

19-1604; Rev 1; 3/00

Pin Configuration

Ordering Information

AAHE

AAHD

TOP

MARK

6 SOT23-6

6 SOT23-6

PIN-

PACKAGE

TEMP. RANGE

-40°C to +85°C

-40°C to +85°C

MAX3189EEUT-T

MAX3188EEUT-T

PART

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

1

SHDN

6

V

CC

C

BYPASS1

0.1µF

TIN

3

CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED.

MAX3188E
MAX3189E

GND

2

V

TOUT

TOP VIEW

16V

5

EE

4

C

BYPASS2

0.1µF

-5.4V+5.4V

SHDN

GND

2

34

CC

MAX3188E
MAX3189E

SOT23-6

5 V

EE

TOUTTIN

MAX3188E/MAX3189E

±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC

= +4.5V to +6V, VEE= -4.5V to -6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

CC

= +5.4V, V

EE

= -5.4V,

and T

A

= +25°C.) (Note 2)

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: VCCand VEEcan have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.

V

CC

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

V

EE

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

V

CC

to VEE(Note 1) .............................................................+13V

TIN, SHDN to GND ...................................................-0.3V to +7V

TOUT to GND (SHDN = GND)..........................................±13.2V

TOUT to GND (SHDN = V

CC

) ................................................±7V

Output Short-Circuit Duration.....................................Continuous

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23 (derate 8.7mW/°C above +70°C)..........691mW

Operating Temperature Range ...........................-40°C to +85°C

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

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

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

MAX3188E

MAX3189E

MAX3188E

MAX3189E

MAX3188E

RL= 3kΩ to 7kΩ,
C

L

= 150pF to 1000pF,
measured from -3V
to +3V or +3V to -3V,
V

CC

= 5.4V, VEE=

-5.4V, TA= +25°C

|t

PHL

- t

PLH

|, Figure 1

RL= 3kΩ,
C

L

= 1000pF

VCC= VEE= 0, V

TOUT

= ±2V

VCC= 5.4V, VEE= -5.4V, RL= 3kΩ

V

SHDN

= 5V

V

SHDN

= 5V

V

SHDN

= 0

VCC= 4.5V, VEE= -4.5V, RL= 3kΩ

CONDITIONS

24 150

V/µs

630

Transition-Region Slew Rate

25

MAX3189E

ns

100

t

TS

Transmitter Skew

1

Mbps

0.25

Maximum Data Rate

µA

±25

I

TOUT

Output Leakage Current

mA

±35 ±60

Output Short-Circuit Current

Ω

300

R

TOUT

Output Resistance

±5

V

±3.7

V

TOUT

Output Voltage Swing

V

-6 -4.5

V

EE

Negative Supply Voltage

V

4.5 6

V

CC

Positive Supply Voltage

mV

100

TIN Input Hysteresis

µA

±0.01 ±1

Input Leakage

V

2.0

V

IH

Input Logic Threshold High

V

0.8

V

IL

Input Logic Threshold Low

µA

170

I

CC

Positive Supply Current

µA

45

I

EE

Negative Supply Current

µA

0.2 1

Shutdown Supply Current

UNITSMIN TYP MAXSYMBOLPARAMETER

µs

2

t

EN

Transmitter Enable Time

V

OUT

= ±12V; VCC= V

EE

= 0 or V

CC

= 5.4V,

V

EE

= -5.4V; SHDN = 0

DC CHARACTERISTICS

INPUT LOGIC (TIN, SHDN)

TRANSMITTER OUTPUTS

TIMING CHARACTERISTICS

MAX3188E/MAX3189E

±15kV ESD-Protected, 1Mbps, 1µA

RS-232 Transmitters in SOT23-6

_______________________________________________________________________________________ 3

Typical Operating Characteristics

(VCC= +5.4V, VEE= -5.4V, RL= 3kΩ, TA= +25°C, unless otherwise noted.)

ELECTRICAL CHARACTERISTICS (continued)

(V

CC

= +4.5V to +6V, VEE= -4.5V to -6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

CC

= +5.4V, V

EE

= -5.4V,

and T

A

= +25°C.) (Note 2)

Note 2: All devices are 100% tested at T

A

= +25°C. All limits over temperature are guaranteed by design.

PARAMETER SYMBOL MIN TYP MAX UNITS

±15

±8

TOUT

±15

kV

CONDITIONS

Human Body Model

IEC 1000-4-2 Contact Discharge

IEC 1000-4-2 Air-Gap Discharge

ESD PROTECTION

SUPPLY CURRENT vs. DATA RATE

= 150pF)

(C

2.5

2.0

ICC (MAX3188E)

1.5

1.0

SUPPLY CURRENT (mA)

0.5

0

00.40.30.1 0.2 0.5 0.6 0.7 0.8 0.9 1.0

L

ICC (MAX3189E)

IEE (MAX3189E)

IEE (MAX3188E)

DATA RATE (Mbps)

MAX3188E/9E toc01

SUPPLY CURRENT vs. DATA RATE

= 1000pF)

(C

7

6

5

4

3

MAX3189E

2

SUPPLY CURRENT (mA)

1

0

0 0.40.30.1 0.2 0.5 0.6 0.7 0.8 0.9 1.0

L

MAX3188E

DATA RATE (Mbps)

4.0

3.5

MAX3188E/9E toc02

3.0

2.5

2.0

1.5

SUPPLY CURRENT (mA)

1.0

0.5

MAX3188E

SUPPLY CURRENT

vs. OUTPUT CAPACITANCE

250kbps

120kbps

40kbps

0

0 500 1000 1500 2000 2500

OUTPUT CAPACITANCE (pF)

MAX3188E/9E toc03

MAX3189E

SUPPLY CURRENT

vs. OUTPUT CAPACITANCE

14

12

10

8

6

SUPPLY CURRENT (mA)

4

2

0

0 1000500 1500 2000 2500

OUTPUT CAPACITANCE (pF)

1Mbps

500kbps

240kbps

40kbps

MAX3188E/9E toc04

SLEW RATE vs. OUTPUT CAPACITANCE

MAX3188E

14

12

10

8

6

SLEW RATE (V/µs)

4

2

0

0 1000500 1500 2000 2500

OUTPUT CAPACITANCE (pF)

-SLEW

+SLEW

MAX3188E/9E toc05

SLEW RATE vs. OUTPUT CAPACITANCE

MAX3189E

90

80

70

60

50

40

SLEW RATE (V/µs)

30

20

10

0

0 1000500 1500 2000 2500

OUTPUT CAPACITANCE (pF)

-SLEW

+SLEW

MAX3188E/9E toc06

Detailed Description

The MAX3188E/MAX3189E are EIA/TIA-232 transmitters
that convert CMOS/TTL logic levels to RS-232 signals.
They operate on ±4.5V to ±6V supplies and feature
enhanced electrostatic discharge protection (see ESD
Protection). The MAX3188E guarantees a 250kbps data
rate, and the MAX3189E guarantees a 1Mbps data rate
with worst-case loads of 3kΩ in parallel with 1000pF.
The MAX3188E/MAX3189E invert the TOUT signal relative
to TIN (standard RS-232). The transmitter input does
not have a pull-up resistor and should be connected to
GND if unused.

Shutdown

The MAX3188E/MAX3189E feature a shutdown input.
Drive SHDN low to reduce the supply current to 1µA
(max). Shutdown also forces TOUT into a high-imped­ance state, allowing the signal line to be safely con­trolled by other transmitters. Drive SHDN high for
normal operation.

ESD Protection

As with all Maxim devices, ESD protection structures are
incorporated on all pins to protect against ESD encoun­tered during handling and assembly. The MAX3188E/
MAX3189Es’ transmitter output has extra protection
against static electricity. Maxim has developed state-of­the-art structures enabling this pin to withstand ESD up

MAX3188E/MAX3189E

±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6

4 _______________________________________________________________________________________

Pin Description

Figure 1. Transmitter Propagation-Delay Timing

SHDN

TOUT 0

-5V

+5V

0

+2V

1µs/div

MAX3188E

TRANSMITTER OUTPUT

SHUTDOWN WAVEFORM

MAX3188E/9E toc07

CL = 150pF

SHDN

TOUT 0

-5V

+5V

0

+2V

1µs/div

MAX3189E

TRANSMITTER OUTPUT

SHUTDOWN WAVEFORM

MAX3188E/9E toc08

CL = 150pF

Typical Operating Characteristics (continued)

(VCC= +5.4V, VEE= -5.4V, RL= 3kΩ, TA= +25°C, unless otherwise noted.)

NAME

FUNCTION

1

SHDN

Active-Low Shutdown. Pull low to
reduce the supply current and to force
TOUT into a high-impedance state.

2 GND Ground

PIN

3 TIN TTL/CMOS Transmitter Input

4 TOUT RS-232 Transmitter Output

6 V

CC

Positive Supply Voltage

5 V

EE

Negative Supply Voltage

+5V

TOUT

-5V

t

PLH

t

V

IH

TIN

V

IL

PHL

50%50%

50%50%

to ±15kV without damage or latch-up. The MAX3188E/
MAX3189E’s transmitter output is characterized for pro­tection to the following limits:

• ±15kV using the Human Body Model

• ±8kV using the Contact Discharge method specified
in IEC 1000-4-2

• ±15kV using the Air-Gap Discharge method specified
in IEC 1000-4-2

Human Body Model

Figure 2 shows the Human Body Model, and Figure 3
shows the current waveform it generates when dis­charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of interest,
and then discharged into the test device through a

1.5kΩ resistor.

IEC 1000-4-2

The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi­cally refer to ICs. The MAX3188E/MAX3189E enable
the design of equipment that meets the highest level
(Level 4) of IEC 1000-4-2 without the need for additional
ESD-protection components. The major difference
between tests done using the Human Body Model and
IEC 1000-4-2 is higher peak current in IEC 1000-4-2.
Because series resistance is lower in the IEC 1000-4-2
model, the ESD withstand voltage measured to this
standard is generally lower than that measured using
the Human Body. Figure 4 shows the IEC 1000-4-2
model, and Figure 5 shows the current waveform for
the ±8kV IEC 1000-4-2 Level 4 ESD Contact Discharge
test. The Air-Gap test involves approaching the device
with a charged probe. The Contact Discharge method
connects the probe to the device before the probe is
energized.

Power-Supply Decoupling

In most circumstances, 0.1µF bypass capacitors are
adequate for power-supply decoupling. Connect the
bypass capacitors as close to the IC as possible.

MAX3188E/MAX3189E

±15kV ESD-Protected, 1Mbps, 1µA

RS-232 Transmitters in SOT23-6

_______________________________________________________________________________________ 5

Figure 2. Human Body ESD Test Model

Figure 3. Human Body Model Current Waveform

Figure 4. IEC 1000-4-2 ESD Test Model

R

D

1500Ω

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

HIGH-

VOLTAGE

DC

SOURCE

R

C

1MΩ

CHARGE-CURRENT

LIMIT RESISTOR

C

100pF

s

PEAK-TO-PEAK RINGING

I

r

(NOT DRAWN TO SCALE)

AMPERES

IP 100%

90%

36.8%

10%

0

0

t

RI

TIME

t

DL

CURRENT WAVEFORM

HIGH-

VOLTAGE

DC

SOURCE

R

C

50MΩ TO 100MΩ

CHARGE-CURRENT

LIMIT RESISTOR

C

150pF

s

R

D

330Ω

DISCHARGE

RESISTANCE

STORAGE
CAPACITOR

DEVICE
UNDER

TEST

DEVICE
UNDER

TEST

MAX3188E/MAX3189E

Applications Information

Power-Supply Sources

The MAX3188E/MAX3189E require ±4.5V to ±6V dual
supplies. For applications where these supply voltages
are not present, a DC-DC converter must be added.
Due to the MAX3188E/MAX3189Es’ low current con­sumption, a charge pump can provide the proper supply
voltages and requires a minimal amount of board
space and cost.

When using another RS-232 device containing an internal
regulated charge pump (Table 1), the MAX3188E/
MAX3189E may be powered from the internal charge
pump (Figure 6). This eliminates the need for additional
external DC-DC converters to generate the required
±4.5V to ±6V dual supplies.

±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6

6 _______________________________________________________________________________________

Figure 6. Powering the MAX3188E/MAX3189E

Figure 5. IEC 1000-4-2 ESD Generator Current Waveform

I

100%

90%

PEAK

I

10%

tR = 0.7ns TO 1ns

30ns

60ns

+3V SUPPLY

C

BYPASS

0.1µF
V

CC

t

C3

0.1µF

0.1µF

0.1µF

C1

C2

C1+

C1-

C2+

C2-

(TABLE 1)

V+

V-

C4

0.1µF

V

V

TIN

CC

EE

SHDN

MAX3188E
MAX3189E

TOUT

GNDGND

MAX3188E/MAX3189E

±15kV ESD-Protected, 1Mbps, 1µA

RS-232 Transmitters in SOT23-6

_______________________________________________________________________________________ 7

PART NO. OF Tx/Rx AutoShutdown

™

DATA RATE

(bps)

MAX3224 2/2 250k

MAX3223E 2/2

✓

250k

MAX3223 2/2

✓

120k

MAX3222E 2/2 250k

MAX3224E 2/2 250k

MAX3225 2/2 1M

MAX3225E 2/2 1M

MAX3226 1/1 250k

MAX3221E

MAX3221 1/1

✓

120k

1/1

✓

250k

MAX3222 2/2 120k

MAX3226E 1/1 250k

MAX3227 1/1 1M

MAX3227E 1/1 1M

MAX3232 2/2 120k

MAX3232E 2/2 250k

MAX3237 5/3 1M

MAX3238 5/3 250k

MAX3241 3/5 120k

MAX3241E 3/5 250k

MAX3243 3/5

✓

120k

MAX3243E 3/5

✓

250k

MAX3244 3/5 250k

MAX3244E 3/5 250k

±15kV ESD

PROTECTION

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

MAX3245 3/5 1M

AutoShutdown

Plus

™

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

✓

MAX3245E 3/5 1M

✓ ✓

Table 1. RS-232 Devices with Internal Regulated Charge Pumps

AutoShutdown and AutoShutdown Plus are trademarks of Maxim Integrated Products.

Chip Information

TRANSISTOR COUNT: 111

MAX3188E/MAX3189E

±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

Package Information

6LSOT.EPS