MAX3380E Datasheet, PDF (1/14 Pages) Maxim Integrated Products – +2.35V to +5.5V, 1μA, 2Tx/2Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins

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
General Description
The MAX3380E/MAX3381E are +2.35V to +5.5V-pow-
ered EIA/TIA-232 and V.28/V.24 communication inter-
faces 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 Air-
Gap 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-compati-
ble levels with no increase in supply current for sup-
plies 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 auto-
matically enter a 1µA shutdown mode. These
devices shut down the on-board power supply and
drivers when they do not sense a valid signal transi-
tion for 30 seconds on either the receiver or trans-
mitter 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 V_L pin. The MAX3380E/MAX3381E
are available in a space-saving TSSOP package.
Applications
Cell Phone Data Lump Cables
PDA Data Lump Cables
GPS Receivers
Digital Cameras
AutoShutdown Plus is a trademark of Maxim Integrated Products
Pin Configuration appears at end of data sheet.
Features
o ±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
o Operates Over Entire Li+ Battery Range
o Low Logic Threshold Down to +1.65V for
Compatibility with Cell Phone Logic Supply Voltages
o 1µA Low-Power AutoShutdown Plus Mode
o Compatible with Next-Generation GSM Data Rates
o 20-Pin TSSOP Package
Ordering Information
PART
MAX3380ECUP
MAX3380EEUP
MAX3381ECUP
MAX3381EEUP
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
Typical Operating Circuit
+3.3V
C5
0.1µF
V_CC V_L
C1
0.1µF
C2
0.1µF
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
C1+
V+
C1-
MAX3380E/
C2+
MAX3381E
V-
C2-
T1IN
T1OUT
T2IN
R1OUT
R2OUT
V_L
V_L
GND
T2OUT
R1IN
5kΩ
R2IN
5kΩ
C3
0.1µF
C4
0.1µF
RS-232
OUTPUTS
RS-232
INPUTS
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