19-1529; Rev 3; 4/01
3.0V, ±25kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
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 ±25kV 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.
Features
o
V
L
Pin for Compatibility with Mixed-Voltage
Systems
o
Enhanced ESD Protection on Rx Inputs and Tx
Outputs
±15kV—Human Body Model
±25kV—IEC 1000-4-2, Air-Gap Discharge
±8kV—IEC 1000-4-2, Contact Discharge
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
Ordering Information
PART
MAX3386ECUP
MAX3386EEUP
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
20 TSSOP
Applications
Subnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
+3.3V
C
BYPASS
C1
0.1µF
Typical Operating Circuit
20
1 C1+
3
4
C1-
SHDN
19
V
CC
12
V
L
V+
2
C3
0.1µF
MAX3386E
C2+
C2-
V-
6
C4
0.1µF
Pin Configuration
TOP VIEW
C1+ 1
V+ 2
C1- 3
C2+ 4
C2- 5
V- 6
T1IN 7
T2IN 8
T3IN 9
R2OUT 10
20 SHDN
19 V
CC
18 GND
17 T1OUT
C2
0.1µF
5
7 T1IN
TTL/CMOS
INPUTS
T1OUT 17
T2OUT 16
T3OUT 15
V
L
RS-232
OUTPUTS
8 T2IN
9 T3IN
MAX3386E
16 T2OUT
15 T3OUT
14 R1IN
13 R2IN
12 V
L
11 R1OUT
TTL/CMOS
OUTPUTS
11 R1OUT
R1IN 14
5kΩ
V
L
RS-232
INPUTS
10 R2OUT
R2IN 13
5kΩ
GND
18
TSSOP
________________________________________________________________
Maxim Integrated Products
1
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.
3.0V, ±25kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
MAX3386E
ABSOLUTE MAXIMUM RATINGS
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, 10s) .................................+300°C
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= V
L
= +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%; T
A
=
T
MIN
to T
MAX
; unless otherwise noted. Typical values are at V
CC
= V
L
= +3.3V, T
A
= +25°C.)
PARAMETER
Shutdown Supply Current
Supply Current
LOGIC INPUTS
Input Logic Threshold Low
T_IN,
SHDN
V
L
= 3.3V or 5.0V
V
L
= 2.5V
V
L
= 5.0V
Input Logic Threshold High
T_IN,
SHDN
V
L
= 3.3V
V
L
= 2.5V
V
L
= 1.8V
Transmitter Input Hysteresis
Input Leakage Current
RECEIVER OUTPUTS
Output Leakage Currents
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
2
T
A
= +25°C
3
T
A
= +25°C
I
OUT
= -1mA
T
A
= +25°C
V
L
= 5.0V
V
L
= 3.3V
V
L
= 5.0V
V
L
= 3.3V
-25
0.8
0.6
1.2
1.5
1.8
1.5
0.5
5
7
2.4
2.4
+25
V
V
V
V
kΩ
R_OUT, receivers disabled
I
OUT
= 1.6mA
I
OUT
= -1mA
V
L
-
0.6
V
L
-
0.1
±0.05
±10
0.4
µA
V
V
T_IN,
SHDN
2.4
2.0
1.4
0.9
0.5
±0.01
±1
V
µA
V
0.8
0.6
V
SYMBOL
CONDITIONS
SHDN
= GND, all inputs at V
CC
or GND
SHDN
= V
CC
, no load
MIN
TYP
1
0.3
MAX
10
1
UNITS
µA
mA
DC CHARACTERISTICS
(V
CC
= +3.3V or +5V, T
A
= +25°C)
_______________________________________________________________________________________
3.0V, ±25kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
L
= +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%; T
A
=
T
MIN
to T
MAX
; unless otherwise noted. Typical values are at V
CC
= V
L
= +3.3V, T
A
= +25°C.)
PARAMETER
TRANSMITTER OUTPUTS
RECEIVER INPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
ESD PROTECTION
Human Body Model
R_IN, T_OUT
ESD Protection
IEC 1000-4-2 Air-Gap Discharge method
IEC 1000-4-2 Contact Discharge method
±15
±25
±8
kV
All transmitter outputs loaded with 3kΩ to
ground
V
CC
= V+ = V- = 0, transmitter output = ±2V
V
T_OUT
= 0
V
T_OUT
= ±12V, transmitters disabled;
V
CC
= 0 or 3.0V to 5.5V
±5
300
±5.4
10M
±60
±25
V
Ω
mA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3386E
TIMING CHARACTERISTICS
(V
CC
= V
L
= +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%; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at V
CC
= V
L
= +3.3V, T
A
= +25°C.)
PARAMETER
Maximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Time to Exit Shutdown
Transmitter Skew
Receiver Skew
Transition-Region Slew
Rate
V
T_OUT
> 3.7V
t
PHL
- t
PLH
(Note 2)
t
PHL
- t
PLH
V
CC
= 3.3V,
T
A
= +25°C,
R
L
= 3kΩ to 7kΩ,
measured from +3V
to -3V or -3V to +3V
C
L
= 150pF to
1000pF
C
L
= 150pF to
2500pF
6
4
t
PHL
t
PLH
SYMBOL
CONDITIONS
R
L
= 3kΩ, C
L
= 1000pF,
one transmitter switching
Receiver input to receiver output,
C
L
= 150pF
MIN
250
0.15
0.15
200
200
100
100
50
30
V/µs
30
TYP
MAX
UNITS
kbps
µs
ns
ns
µs
ns
ns
Note 2:
Transmitter skew is measured at the transmitter zero crosspoint.
_______________________________________________________________________________________
3
3.0V, ±25kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
MAX3386E
Typical Operating Characteristics
(V
CC
= V
L
= +3.3V, T
A
= +25°C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3386E toc 01
SLEW RATE vs. LOAD CAPACITANCE
14
12
SLEW RATE (V/µs)
SLEW RATE -
10
8
6
4
SLEW RATE +
MAX3386E toc 02
7.5
5.0
OUTPUT VOLTAGE (V)
2.5
0
-2.5
-5.0
-7.5
0
1000
2000
3000
4000
DATA RATE = 250kbps
LOAD = 3kΩ IN PARALLEL WITH C
L
16
2
0
5000
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE
vs. DATA RATE
MAX3386E toc 03
SUPPLY CURRENT vs. LOAD CAPACITANCE
LOAD = 3kΩ,
ONE TRANSMITTER
SWITCHING AT DATA
RATE, OTHER
250kbps
TRANSMITTERS
AT 1/8 DATA RATE
120kbps
MAX3386E toc 04
7.5
5.0
OUTPUT VOLTAGE (V)
2.5
0
-2.5
-5.0
-7.5
0
50
100
150
200
LOAD = 3kΩ, 1000pF
ONE TRANSMITTER
SWITCHING AT DATA
RATE, OTHER
TRANSMITTERS
AT 1/8 DATA RATE
60
50
SUPPLY CURRENT (mA)
40
30
20
10
0
20kbps
250
0
1000
2000
3000
4000
5000
DATA RATE (kbps)
LOAD CAPACITANCE (pF)
4
_______________________________________________________________________________________
3.0V, ±25kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NAME
C1+
V+
C1-
C2+
C2-
V-
T1IN
T2IN
T3IN
R2OUT
R1OUT
V
L
R2IN
RS-232 Receiver Inputs
R1IN
T3OUT
T2OUT
T1OUT
GND
V
CC
SHDN
Ground
+3.0V to +5.5V Supply Voltage
Shutdown Input. 0 = shutdown, 1 = normal operation.
RS-232 Transmitter Outputs
TTL/CMOS Receiver Outputs. Swing between 0 and V
L
.
Logic-Level Supply. All CMOS inputs and outputs are referenced to this supply.
TTL/CMOS Transmitter Inputs
FUNCTION
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor
+5.5V Supply Generated by the Charge Pump
Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor
Positive Terminal of the Inverting Charge-Pump Capacitor
Negative Terminal of the Inverting Charge-Pump Capacitor
-5.5V Generated by the Charge Pump
MAX3386E
_______________________________________________________________________________________
5
NXP MCU
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