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General Description
The MAX3386E 3V-powered EIA/TIA-232 and V.28/V.24
is a communications interface with low power require-
ments, high data-rate capabilities, and enhanced elec-
trostatic discharge (ESD) protection. The MAX3386E
has two 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 MAX3386E is capable of
running at data rates up to 250kbps while maintaining
RS-232 compliant output levels.
The MAX3386E has a unique V
L
pin that allows interop-
eration in mixed-logic voltage systems. Both input and
output logic levels are pin programmable through the
V
L
pin. The MAX3386E 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
o
V
L
Pin for Compatibility with Mixed-Voltage
Systems
o
±15kV ESD Protection on Rx Inputs and Tx Outputs
o
Low 300µA Supply Current
o
Guaranteed 250kbps Data Rate
o
1µA Low-Power Shutdown
o
Meets EIA/TIA-232 Specifications Down to 3.0V
MAX3386E
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
________________________________________________________________
Maxim Integrated Products
1
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
SHDN
V
CC
GND
T1OUT
C2+
C1-
V+
C1+
TOP VIEW
T2OUT
T3OUT
R1IN
R2IN
T2IN
T1IN
V-
C2-
12
11
9
10
V
L
R1OUT
R2OUT
T3IN
TSSOP
MAX3386E
MAX3386E
R2OUT
10
R1OUT
V
L
11
R2IN 13
GND
18
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T2IN
8
T1IN
7
C2-
5
C2+
4
C1-
3
C1+
1
R1IN 14
T2OUT 16
T1OUT 17
V-
6
V+
2
V
CC
V
L
12
19
C1
0.1
µ
F
C2
0.1
µ
F
C
BYPASS
+3.3V
T3IN
9
T3OUT 15
RS-232
INPUTS
TTL/CMOS
OUTPUTS
5k
5k
C3
0.1
µ
F
C4
0.1
µ
F
V
L
20
SHDN
Typical Operating Circuit
19-1529; Rev 1; 10/99
PART
MAX3386ECUP
MAX3386EEUP
-40°C to +85°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
20 TSSOP
20 TSSOP
Pin Configuration
Ordering Information
I
OUT
= -1mA
MAX3386E
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= V
L
= +3.0V to +5.5V; C1C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2C4 = 0.33µF, tested at +5.0V ±10%; T
A
=
T
MIN
to T
MAX
; unless otherwise noted. Typical values are at V
CC
= V
L
= +3.3V, T
A
= +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 (V
CC
+ 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, SHDN 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)
20-Pin TSSOP (derate 7.0mW/°C above +70°C) .......559mW
Operating Temperature Ranges
MAX3386ECUP .................................................0°C to +70°C
MAX3386EEUP ..............................................-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
R_OUT, receivers disabled
T_IN, SHDN
T_IN, SHDN
SHDN = GND, all inputs at V
CC
or GND
SHDN = V
CC
, no load
CONDITIONS
V
0.4
Output Voltage Low
µA
±0.05
±10
Output Leakage Currents
µA
±0.01
±1
Input Leakage Current
V
0.5
Transmitter Input Hysteresis
V
0.9
Input Logic Threshold High
1.4
2.0
2.4
V
0.8
1
10
µA
Shutdown Supply Current
mA
0.3
1
Supply Current
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
L
= 5.0V
V
L
= 3.3V
V
L
= 2.5V
V
L
= 1.8V
I
OUT
= -1mA
V
V
L
- V
L
-
0.6
0.1
Output Voltage High
V
L
= 3.3V or 5.0V
T_IN, SHDN
0.6
Input Logic Threshold Low
V
L
= 2.5V
V
-25
+25
Input Voltage Range
T
A
= +25°C
V
0.8
1.2
Input Threshold Low
0.6
1.5
V
L
= 5.0V
V
L
= 2.5V or 3.3V
T
A
= +25°C
V
1.8
2.4
Input Threshold High
1.5
2.4
V
L
= 5.0V
V
L
= 2.5V or 3.3V
V
0.5
Input Hysteresis
3
5
7
T
A
= +25°C
k
Input Resistance
DC CHARACTERISTICS
(V
CC
= +3.3V or +5V, T
A
= +25°C)
LOGIC INPUTS
RECEIVER OUTPUTS
RECEIVER INPUTS
MAX3386E
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
_______________________________________________________________________________________
3
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
L
= +3.0V to +5.5V; C1C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2C4 = 0.33µF, tested at +5.0V ±10%; T
A
=
T
MIN
to T
MAX
; unless otherwise noted. Typical values are at V
CC
= V
L
= +3.3V, T
A
= +25°C.)
TIMING CHARACTERISTICS
(V
CC
= V
L
= +3V to +5.5V; C1C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2C4 = 0.33µF, tested at +5.0V ±10%; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at V
CC
= V
L
= +3.3V, T
A
= +25°C.)
IEC 1000-4-2 Air-Gap Discharge method
Human Body Model
V
T_OUT
= ±12V, transmitters disabled;
V
CC
= 0 or 3.0V to 5.5V
V
T_OUT
= 0
V
CC
= V+ = V- = 0, transmitter output = ±2V
All transmitter outputs loaded with 3k
to
ground
CONDITIONS
±15
±15
µA
±25
Output Leakage Current
mA
±60
Output Short-Circuit Current
300
10M
Output Resistance
V
±5
±5.4
Output Voltage Swing
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
R
L
= 3k
, C
L
= 1000pF,
one transmitter switching
(Note 2)
V
T_OUT
> 3.7V
Receiver input to receiver output,
C
L
= 150pF
CONDITIONS
6
30
ns
50
t
PHL
- t
PLH
Receiver Skew
ns
100
t
PHL
- t
PLH
Transmitter Skew
µs
100
Time to Exit Shutdown
ns
200
Receiver Output Disable Time
ns
200
Receiver Output Enable Time
µs
0.15
t
PLH
Receiver Propagation Delay
kbps
250
Maximum Data Rate
0.15
t
PHL
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
IEC 1000-4-2 Contact Discharge method
kV
±8
R_IN, T_OUT
ESD Protection
V
CC
= 3.3V,
T
A
= +25°C,
R
L
= 3k
to 7k
,
measured from +3V
to -3V or -3V to +3V
V/µs
4
30
Transition-Region Slew
Rate
C
L
= 150pF to
1000pF
C
L
= 150pF to
2500pF
Note 2:
Transmitter skew is measured at the transmitter zero crosspoint.
RECEIVER INPUTS
TRANSMITTER OUTPUTS
ESD PROTECTION
MAX3386E
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= V
L
= +3.3V, T
A
= +25°C, unless otherwise noted.)
-7.5
-5.0
-2.5
0
2.5
5.0
7.5
0
1000
2000
3000
4000
5000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3386E toc 01
LOAD CAPACITANCE (pF)
OUTPUT VOLTAGE (V)
DATA RATE = 250kbps
LOAD = 3k
IN PARALLEL WITH C
L
0
2
4
6
8
10
12
14
16
0
1000
2000
3000
4000
5000
SLEW RATE vs. LOAD CAPACITANCE
MAX3386E toc 02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
SLEW RATE +
SLEW RATE -
-7.5
-5.0
-2.5
0
2.5
5.0
7.5
0
50
100
150
200
250
TRANSMITTER OUTPUT VOLTAGE
vs. DATA RATE
MAX3386E toc 03
DATA RATE (kbps)
OUTPUT VOLTAGE (V)
LOAD = 3k
, 1000pF
ONE TRANSMITTER
SWITCHING AT DATA
RATE, OTHER
TRANSMITTERS
AT 1/8 DATA RATE
0
10
20
30
40
50
60
0
1000
2000
3000
4000
5000
SUPPLY CURRENT vs. LOAD CAPACITANCE
MAX3386E toc 04
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
LOAD = 3k
,
ONE TRANSMITTER
SWITCHING AT DATA
RATE, OTHER
TRANSMITTERS
AT 1/8 DATA RATE
MAX3386E
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
_______________________________________________________________________________________
5
1
C1+
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor
Pin Description
2
V+
+5.5V Supply Generated by the Charge Pump
3
C1-
Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor
4
C2+
Positive Terminal of the Inverting Charge-Pump Capacitor
5
C2-
Negative Terminal of the Inverting Charge-Pump Capacitor
6
V-
-5.5V Generated by the Charge Pump
7
T1IN
8
T2IN
9
T3IN
TTL/CMOS Transmitter Inputs
10
R2OUT
11
R1OUT
12
V
L
Logic-Level Supply. All CMOS inputs and outputs are referenced to this supply.
13
R2IN
14
R1IN
15
T3OUT
16
T2OUT
17
T1OUT
RS-232 Transmitter Outputs
18
GND
Ground
19
V
CC
+3.0V to +5.5V Supply Voltage
20
SHDN
Shutdown Input. 0 = shutdown, 1 = normal operation.
NAME
FUNCTION
PIN
TTL/CMOS Receiver Outputs. Swing between 0 and V
L
.
RS-232 Receiver Inputs
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