MAXIM MAX3188, MAX3189 Technical data

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General Description

The MAX3188/MAX3189 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. RS-232 data transmission
is guaranteed up to 250kbps with the MAX3188 and up
to 1Mbps with the MAX3189.

The MAX3188/MAX3189 transmitters are inverting level
translators that convert CMOS-logic levels to 5V
EIA/TIA-232 levels. They feature a shutdown input that
reduces current consumption to only 1µA and forces
the transmitter output into a high-impedance state. The
MAX3188/MAX3189 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

♦ 150µA Supply Current

♦ Shutdown Reduces Supply Current to 1µA

♦ Guaranteed Data Rate

1Mbps (MAX3189)
250kbps (MAX3188)

♦ Three-State RS-232 Transmitter Output

♦ No External Components Required

MAX3188/MAX3189

1Mbps, 1µA RS-232 Transmitters in SOT23-6

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

19-1628; Rev 0; 2/00

PART

MAX3188EUT-T

MAX3189EUT-T

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

6 SOT23-6

6 SOT23-6

Pin Configuration

Ordering Information

TOP

MARK

AAHJ

AAHK

1

SHDN

6

V

CC

C

BYPASS1

0.1µF

TIN

3

CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED.

MAX3188
MAX3189

GND

2

V

TOUT

TOP VIEW

5

EE

4

C

BYPASS2

0.1µF

-5.4V+5.4V

SHDN

GND

16V

MAX3188

2

MAX3189

34

SOT23-6

5 V

CC

EE

TOUTTIN

MAX3188/MAX3189

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 VCC= +5.4V, VEE= -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.

Note 2: All devices are 100% tested at T

A

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

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 +160°C

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

MAX3188EUT

MAX3189EUT

MAX3188EUT

MAX3189EUT

MAX3188EUT

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, T

A

= +25°C

|t

PHL

- t

PLH

|, Figure 1

RL= 3kΩ,
CL= 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

MAX3189EUT

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

110 170

I

CC

Positive Supply Current

µA

45 34

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= VEE= 0 or VCC= +5.4V,

V

EE

= -5.4V; SHDN = 0

DC CHARACTERISTICS

INPUT LOGIC (TIN, SHDN)

TRANSMITTER OUTPUTS

TIMING CHARACTERISTICS

MAX3188/MAX3189

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.)

SUPPLY CURRENT vs. DATA RATE

= 150pF)

(C

2.5

2.0

ICC (MAX3188)

1.5

1.0

SUPPLY CURRENT (mA)

0.5

0

0 0.40.30.1 0.2 0.5 0.6 0.7 0.8 0.9 1.0

L

ICC (MAX3189)

IEE (MAX3189)

IEE (MAX3188)

DATA RATE (Mbps)

MAX3189

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

MAX3188/9 toc01

MAX3188/9 toc04

500kbps

240kbps

40kbps

SUPPLY CURRENT vs. DATA RATE

= 1000pF)

(C

7

6

5

4

3

MAX3189

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

MAX3188

DATA RATE (Mbps)

MAX3188

SLEW RATE vs. OUTPUT CAPACITANCE

14

12

10

8

6

SLEW RATE (V/µs)

4

2

0

0 1000500 1500 2000 2500

OUTPUT CAPACITANCE (pF)

-SLEW

+SLEW

4.0

3.5

MAX3188/9 toc02

3.0

2.5

2.0

1.5

SUPPLY CURRENT (mA)

1.0

0.5

MAX3188/9 toc05

SLEW RATE (V/µs)

MAX3188

SUPPLY CURRENT

vs. OUTPUT CAPACITANCE

250kbps

120kbps

40kbps

0

0 500 1000 1500 2000 2500

OUTPUT CAPACITANCE (pF)

MAX3189

SLEW RATE vs. OUTPUT CAPACITANCE

90

80

70

60

50

40

30

20

10

0

0 1000500 1500 2000 2500

OUTPUT CAPACITANCE (pF)

-SLEW

+SLEW

MAX3188/9 toc03

MAX3188/9 toc06

MAX3188

TRANSMITTER OUTPUT

SHUTDOWN WAVEFORM

SHDN

TOUT 0

1µs/div

MAX3188/9 toc07

CL = 150pF

+2V

0

+5V

-5V

SHDN

TOUT 0

MAX3189

TRANSMITTER OUTPUT

SHUTDOWN WAVEFORM

1µs/div

MAX3188/9 toc08

CL = 150pF

+2V

0

+5V

-5V

Detailed Description

The transmitter is an inverting level translator that
converts CMOS-logic levels to 5V EIA/TIA-232 levels.
The MAX3188 guarantees a 250kbps data rate, and the
MAX3189 guarantees a 1Mbps data rate with worst-case
loads of 3kΩ in parallel with 1000pF. The transmitter
input does not have a pull-up resistor and should be
connected to GND if unused.

Shutdown

The MAX3188/MAX3189 feature a shutdown input.
Drive SHDN low to reduce the supply current to 1µA
(max). Shutdown also forces TOUT into a high­impedance state that allows the signal line to be safely
controlled by other transmitters. Drive SHDN high for
normal operation.

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.

Applications Information

Power-Supply Sources

The MAX3188/MAX3189 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 devices’ 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 MAX3188/
MAX3189 may be powered from the internal charge
pump (Figure 2). This eliminates the need for additional
external DC-DC converters to generate the required
±4.5V to ±6V dual supplies.

MAX3188/MAX3189

1Mbps, 1µA RS-232 Transmitters in SOT23-6

4 _______________________________________________________________________________________

Pin Description

Negative Supply VoltageV

EE

5

Positive Supply VoltageV

CC

6

RS-232 Transmitter OutputTOUT4

TTL/CMOS Transmitter InputTIN3

PIN

GroundGND2

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

SHDN

1

FUNCTIONNAME

Figure 1. Transmitter Propagation-Delay Timing

+5V

TOUT

-5V

t

PLH

t

V

IH

TIN

V

IL

PHL

50%50%

50%50%

MAX3188/MAX3189

1Mbps, 1µA RS-232 Transmitters in SOT23-6

_______________________________________________________________________________________ 5

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.

MAX3188/MAX3189

1Mbps, 1µA RS-232 Transmitters in SOT23-6

6 _______________________________________________________________________________________

Figure 2. Powering the MAX3188/MAX3189

Chip Information

TRANSISTOR COUNT: 111

+3V SUPPLY

C

BYPASS

0.1µF
V

CC

C3

0.1µF

C1

0.1µF

C2

0.1µF

C1+

C1-

C2+

C2-

(TABLE 1)

V+

V-

C4

0.1µF

V

V

TIN

CC

EE

MAX3188
MAX3189

SHDN

TOUT

GNDGND

MAX3188/MAX3189

1Mbps, 1µA RS-232 Transmitters in SOT23-6

_______________________________________________________________________________________ 7

Package Information

6LSOT.EPS

MAX3188/MAX3189

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.

NOTES