Maxim MAX3387ECUG, MAX3387EEUG Datasheet

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General Description

The MAX3387E 3V powered EIA/TIA-232 and V.28/V.24
is a communications interface with low power require­ments, high data-rate capabilities, and enhanced elec­trostatic discharge (ESD) protection. The MAX3387E
has three receivers and three transmitters. 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.

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 MAX3387E is capa­ble of running at data rates up to 250kbps while main­taining RS-232 compliant output levels.

The MAX3387E has a unique VLpin that allows interop­eration in mixed-logic voltage systems. Both input and
output logic levels are pin programmable through the
VLpin. The MAX3387E is available in a space-saving
TSSOP package.

Applications

Subnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals

Features

♦ VLPin for Compatibility with Mixed-Voltage

Systems

♦ ±15kV ESD Protection on Rx Inputs and Tx Outputs
♦ Low 300µA Supply Current
♦ Guaranteed 250kbps Data Rate
♦ 1µA AutoShutdown Plus™ with Receivers Active
♦ Meets EIA/TIA-232 Specifications Down to 3.0V

MAX3387E

3V, ±15kV ESD-Protected, AutoShutdown Plus

RS-232 Transceiver for PDAs and Cell Phones

________________________________________________________________

Maxim Integrated Products

1

Typical Operating Circuit

19-1561; Rev 1; 10/99

Pin Configuration

Ordering Information

AutoShutdown Plus is a trademark of Maxim Integrated Products.

PART

MAX3387ECUG
MAX3387EEUG

TEMP. RANGE

0°C to +70°C

-40°C to +85°C

PIN-PACKAGE

24 TSSOP
24 TSSOP

TOP VIEW

C1+

C1-

C2-

T1IN

INVALID

T3IN

FORCEON

1

2

V+

3

4

MAX3387E

5

6

V-

7

8

9

10

11

12

TSSOP

24

23

22

21

20

19

18

17

16

15

14

13

FORCEOFF

V

CC

GND

T1OUTC2+

T2OUT

T3OUT

R1IN

R2INT2IN

R3IN

V

L

R1OUT

R2OUTR3OUT

+3.3V

C

BYPASS

C1

0.1µF

C2

0.1µF

TTL/CMOS

INPUTS

TTL/CMOS

OUTPUTS

11

23 15

V

CC

MAX3387E

V

V

V

L

GND

22

L

L

10

9

1

3

4

5

7

8

24

FORCEOFF

C1+

C1-

C2+

C2-

T1IN

T2IN

T3IN

R1OUT14

R2OUT13

R3OUT12

INVALID

FORCEON

V

L

2

V+

6

V-

T1OUT

21

20

T2OUT

19

T3OUT

18

R1IN

5k

R2IN

17

5k

R3IN

16

5k

C3

0.1µF

C4

0.1µF

RS-232
OUTPUTS

RS-232
INPUTS

MAX3387E

3V, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= VL= +3.0V to +5.5V; C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at +5.0V ±10%; TA=
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 +6V

V

L

to GND...................................................-0.3V to (VCC+ 0.3V)

V+ to GND................................................................-0.3V to +7V

V- to GND .................................................................+0.3V to -7V

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

Input Voltages

T_IN, FORCEON, FORCEOFF to GND..................-0.3V to +6V

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

Output Voltages

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

R_OUT........................................................-0.3V to (V

L

+ 0.3V)

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

Continuous Power Dissipation (T

A

= +70°C)

24-Pin TSSOP (derate 7.8mW/°C above +70°C) ..........625mW

Operating Temperature Ranges

MAX3387ECUG ...................................................0°C to +70°C

MAX3387EEUG ................................................-40°C to +85°C

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

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

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

I

OUT

= 1.6mA

All R_IN idle, FORCEON = GND,
FORCEOFF = V

CC

, all T_IN idle

T_IN, FORCEON, FORCEOFF

T_IN, FORCEON,

FORCEOFF

FORCEOFF = FORCEON = VCC, no load

CONDITIONS

V0.4Output Voltage Low

µA±0.01 ±1Input Leakage Current

V0.5Transmitter Input Hysteresis

V

0.9

Input Logic Threshold High

1.4

2.0

µA1.0 10

Supply Current, AutoShutdown
Plus

2.4

V

0.8

0.3 1 mASupply Current

UNITSMIN TYP MAXSYMBOLPARAMETER

VL= 5.0V
VL= 3.3V
VL= 2.5V
VL= 1.8V

I

OUT

= -1mA V

VL- VL-

0.6 0.1

Output Voltage High

VL= 3.3V or 5.0V

T_IN, FORCEON,

FORCEOFF

0.6

Input Logic Threshold Low

VL= 2.5V

V-25 +25Input Voltage Range

TA= +25°C V

0.8 1.5

Input Threshold Low

VL= 5.0V
VL= 2.5V or 3.3V 0.6 1.2

TA= +25°C V

1.8 2.4

Input Threshold High

VL= 5.0V
VL= 2.5V or 3.3V 1.5 2.4

DC CHARACTERISTICS (VCC= +3.3V or +5V, TA= +25°C)

LOGIC INPUTS

RECEIVER OUTPUTS

RECEIVER INPUTS

MAX3387E

3V, ±15kV ESD-Protected, AutoShutdown Plus

RS-232 Transceiver for PDAs and Cell Phones

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= VL= +3.0V to +5.5V; C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at +5.0V ±10%; TA=
T

MIN

to T

MAX

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

AutoShutdown Plus (FORCEON = GND, FORCEOFF = V

CC

)

ESD PROTECTION

TRANSMITTER OUTPUTS

-2.7Negative threshold

Figure 3a

Positive threshold

Receiver or Transmitter Edge to
Transmitters Shutdown

t

AUTOSHDN

15 30 60 sec

Receiver Positive or Negative
Threshold to INVALID Low

t

INVL

30

VCC= 5V, Figure 3b

Receiver or Transmitter Edge to
Transmitters Enabled

t

WU

100

µsVCC= 5V, Figure 3b

µsVCC= 5V, Figure 3b

Receiver Positive or Negative
Threshold to INVALID High

t

INVH

1 µs

INVALID Output Voltage Low

0.4

VCC= 5V, Figure 3b

INVALID Output Voltage High

VL- 0.6

VI

OUT

= -1.6mA

VI

OUT

= -1.0mA

Receiver Input Threshold to
INVALID Output Low

-0.3 0.3 V

Receiver Input Threshold to
INVALID Output High

2.7
V

Figure 3a

R_IN, T_OUT
ESD Protection

±8

kV

IEC 1000-4-2 Contact Discharge method

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Hysteresis 0.5 V
Input Resistance 357kΩ

Output Voltage Swing ±5 ±5.4 V
Output Resistance 300 10M Ω

Output Short-Circuit Current ±60 mA

Output Leakage Current ±25 µA

±15
±15

CONDITIONS

TA= +25°C

All transmitter outputs loaded with 3kΩ to
ground

VCC= V+ = V- = 0, transmitter output = ±2V
V

T_OUT

= 0

V

T_OUT

= ±12V, transmitters disabled;

VCC= 0 or 3.0V to 5.5V

Human Body Model
IEC 1000-4-2 Air-Gap Discharge method

TRANSMITTER OUTPUTS

ESD PROTECTION

AutoShutdown Plus (FORCEON = GND, FORCEOFF = V

CC

)

CL= 150pF to
1000pF

CL= 150pF to
2500pF

VCC= 3.3V,
TA= +25°C,
RL= 3kΩ to 7kΩ,
measured from +3V
to -3V or -3V to +3V

RL= 3kΩ, CL= 1000pF,
one transmitter switching

(Note 2)

V/µs

430



V

T_OUT



> 3.7V

Transition-Region Slew
Rate

Receiver input to receiver output,
CL= 150pF

CONDITIONS

630

ns50



t

PHL

- t

PLH



Receiver Skew

ns100



t

PHL

- t

PLH



Transmitter Skew

µs100Time to Exit Shutdown

µs

0.15t

PLH

Receiver Propagation Delay

kbps250Maximum Data Rate

0.15t

PHL

UNITSMIN TYP MAXSYMBOLPARAMETER

TIMING CHARACTERISTICS

(VCC= VL= +3V to +5.5V; C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at +5.0V ±10%; TA= T

MIN

to T

MAX

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

MAX3387E

3V, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones

4 _______________________________________________________________________________________

MAX3387E

3V, ±15kV ESD-Protected, AutoShutdown Plus

RS-232 Transceiver for PDAs and Cell Phones

_______________________________________________________________________________________

5

Typical Operating Characteristics

(VCC= VL= +3.3V, TA = +25°C, unless otherwise noted.)

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

7.5

5.0

2.5

-2.5

OUTPUT VOLTAGE (V)

-5.0

-7.5

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

0

0 1000 2000 3000 4000 5000

LOAD CAPACITANCE (pF)

L

TRANSMITTER OUTPUT VOLTAGE

vs. DATA RATE

7.5

5.0

2.5

0

-2.5

OUTPUT VOLTAGE (V)

-5.0

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

MAX3387E-01

MAX3387E-03

SLEW RATE vs. LOAD CAPACITANCE

16

14

12

10

SLEW RATE +

8

6

SLEW RATE (V/µs)

4

2

0

0 1000 2000 3000 4000 5000

LOAD CAPACITANCE (pF)

SUPPLY CURRENT vs. LOAD CAPACITANCE

60

LOAD = 3kΩ,
ONE TRANSMITTER

50

SWITCHING AT DATA
RATE, OTHER
TRANSMITTERS

40

AT 1/8 DATA RATE

30

20

SUPPLY CURRENT (mA)

10

MAX3387E-02

SLEW RATE -

MAX3387E-04

250kbps

120kbps

20kbps

-7.5
0 50 100 150 200 250

DATA RATE (kbps)

0

0 1000 2000 3000 4000 5000

LOAD CAPACITANCE (pF)