19-1529; Rev 1; 10/99
3.0V, ±15kV 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 ±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.
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
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-
C2+
C2-
SHDN
19
V
CC
12
V
L
V+
2
C3
0.1µF
6
C4
0.1µF
MAX3386E
V-
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
11 R1OUT
R1IN 14
5k
V
L
RS-232
INPUTS
16 T2OUT
15 T3OUT
14 R1IN
13 R2IN
5k
TTL/CMOS
OUTPUTS
10 R2OUT
R2IN 13
12 V
L
11 R1OUT
GND
18
TSSOP
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
