19-2128; Rev 0; 8/01
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
♦ ±15kV ESD Protection on All CMOS and RS-232
Inputs and Outputs (Except INVALID)
±15kV Human Body Model
±15kV IEC 1000-4-2 Air-Gap Discharge
±8kV IEC 1000-4-2 Contact Discharge
♦ Operates Over Entire Li+ Battery Range
♦ Low Logic Threshold Down to +1.65V for
Compatibility with Cell Phone Logic Supply Voltages
♦ 1µA Low-Power AutoShutdown Plus Mode
♦ Compatible with Next-Generation GSM Data Rates
♦ 20-Pin TSSOP Package
Ordering Information
PART
20 TSSOP
20 TSSOP
20 TSSOP
MAX3381EEUP
-40°C to +85°C
20 TSSOP
Typical Operating Circuit
C5
0.1μF
C1
0.1μF
C2
0.1μF
VCC
VL
C1+
FORCEON
+3.3V
V+
C3
0.1μF
C1C2+
MAX3380E/
MAX3381E
V-
C2T1IN
TTL/CMOS
INPUTS
PDA Data Lump Cables
GPS Receivers
Digital Cameras
T2IN
T2OUT
C4
0.1μF
T1OUT
RS-232
OUTPUTS
VL
R1OUT
TTL/CMOS
OUTPUTS
AutoShutdown Plus is a trademark of Maxim Integrated Products
PIN-PACKAGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
Applications
Cell Phone Data Lump Cables
TEMP. RANGE
MAX3380ECUP
MAX3380EEUP
MAX3381ECUP
FORCEOFF
The MAX3380E/MAX3381E are +2.35V to +5.5V-powered EIA/TIA-232 and V.28/V.24 communication interfaces with low power requirements, high data-rate
capabilities, and enhanced electrostatic discharge
(ESD) protection on both the TTL and RS-232 sides.
The MAX3380E/MAX3381E have two receivers and two
transmitters. All RS-232 inputs, outputs, and logic input
pins are protected to ±15kV using IEC 1000-4-2 AirGap Discharge method and the Human Body Model,
and ±8kV using IEC 1000-4-2 Contact Discharge
method.
The proprietary low-dropout transmitter output stage
enables true RS-232 performance from a +3.1V to
+5.5V supply with a dual charge pump. The parts
reduce the transmitter output levels to RS-232-compatible levels with no increase in supply current for supplies less than +3.1V and greater than +2.35V. The
+2.35V to +5.5V operating range is fully compatible
with lithium-ion (Li+) batteries. The charge pump
requires only four small 0.1µF capacitors for operation.
The MAX3380E/MAX3381E transceivers use Maxim’s
revolutionary AutoShutdown Plus™ feature to automatically enter a 1µA shutdown mode. These
devices shut down the on-board power supply and
drivers when they do not sense a valid signal transition for 30 seconds on either the receiver or transmitter inputs.
The MAX3380E is capable of transmitting data at
rates of 460kbps while maintaining RS-232 output
levels, and the MAX3381E operates at data rates up
to 250kbps. The MAX3381E offers a slower slew rate
for applications where noise and EMI are issues. The
MAX3380E/MAX3381E have a unique V L pin that
allows interoperation in mixed-logic voltage systems
down to +1.65V. Both input and output logic levels
are referenced to the VL pin. The MAX3380E/MAX3381E
are available in a space-saving TSSOP package.
Features
R1IN
5kΩ
VL
R2OUT
RS-232
INPUTS
R2IN
5kΩ
Pin Configuration appears at end of data sheet.
GND
________________________________________________________________ Maxim Integrated Products
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.
1
MAX3380E/MAX3381E
General Description
