19-1561; Rev 3; 6/10
3V, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones
General Description
The MAX3387E 3V powered TIA/EIA-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 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 capa-
ble of running at data rates up to 250kbps while main-
taining RS-232 compliant output levels.
The MAX3387E 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 MAX3387E is available in a space-saving
TSSOP package.
Features
♦
V
L
Pin 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 TIA/EIA-232 Specifications Down to 3.0V
MAX3387E
Ordering Information
PART
MAX3387ECUG+
MAX3387EEUG+
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
24 TSSOP
24 TSSOP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
+3.3V
C
BYPASS
C1
0.1μF
24
FORCEOFF
1 C1+
3
4
C2
0.1μF
5
C1-
C2+
C2-
T1OUT 21
T2OUT 20
T3OUT 19
V
L
14 R1OUT
R1IN 18
5k
R2IN 17
5k
V
L
12
9
R3OUT
INVALID
FORCEON
11
GND
22
R3IN 16
5k
RS-232
INPUTS
RS-232
OUTPUTS
23
V
CC
15
V
L
V+
2
C3
0.1μF
6
C4
0.1μF
Applications
Subnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
MAX3387E
V-
7 T1IN
TTL/CMOS
INPUTS
8 T2IN
10 T3IN
V
L
TTL/CMOS
OUTPUTS
13 R2OUT
AutoShutdown Plus is a trademark of Maxim Integrated Products.
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
