MAX3380E-MAX3381E MAXIM [Maxim Integrated Products], MAX3380E-MAX3381E Datasheet

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MAX3380E-MAX3381E

Manufacturer Part Number
MAX3380E-MAX3381E
Description
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
+2.35V to +5.5V, 1µA, 2Tx/2Rx RS-232 Transceivers
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-
m a t i c a l l y e n t e r a 1 µ A s h u t d o w n m o d e . T h e s e
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
allows interoperation in mixed-logic voltage systems
down to +1.65V. Both input and output logic levels
are referenced to the V
are available in a space-saving TSSOP package.
19-2128; Rev 0; 8/01
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.
Pin Configuration appears at end of data sheet.
AutoShutdown Plus is a trademark of Maxim Integrated Products
Cell Phone Data Lump Cables
PDA Data Lump Cables
GPS Receivers
Digital Cameras
with ±15kV ESD-Protected I/O and Logic Pins
________________________________________________________________ Maxim Integrated Products
L
General Description
pin. The MAX3380E/MAX3381E
Applications
L
pin that
o ±15kV ESD Protection on All CMOS and RS-232
o Operates Over Entire Li+ Battery Range
o Low Logic Threshold Down to +1.65V for
o 1µA Low-Power AutoShutdown Plus Mode
o Compatible with Next-Generation GSM Data Rates
o 20-Pin TSSOP Package
TTL/CMOS
MAX3380ECUP
MAX3380EEUP
MAX3381ECUP
MAX3381EEUP
TTL/CMOS
Inputs and Outputs (Except INVALID)
Compatibility with Cell Phone Logic Supply Voltages
OUTPUTS
+3.3V
INPUTS
±15kV Human Body Model
±15kV IEC 1000-4-2 Air-Gap Discharge
±8kV IEC 1000-4-2 Contact Discharge
0.1µF
0.1µF
C1
C2
PART
0.1µF
C5
Typical Operating Circuit
T1IN
C1+
C1-
C2-
T2IN
C2+
R2OUT
R1OUT
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
Ordering Information
0°C to +70°C
0°C to +70°C
V
MAX3380E/
CC
MAX3381E
GND
V
V
V
L
L
L
T1OUT
T2OUT
5kΩ
R1IN
R2IN
5kΩ
V+
V-
PIN-PACKAGE
20 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
Features
C3
0.1µF
C4
0.1µF
RS-232
INPUTS
RS-232
OUTPUTS
1

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MAX3380E-MAX3381E Summary of contents

Page 1

... 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 ...

Page 2

... Short-Circuit Duration T_OUT to GND........................Continuous Continuous Power Dissipation (T 20-Pin TSSOP (derate 10.9mW/°C over +70°C) .........879mW Operating Temperature Ranges MAX3380ECUP/MAX3381ECUP........................0°C to +70°C MAX3380EEUP/MAX3381EEUP .....................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C + 0.3V) L < ...

Page 3

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins ELECTRICAL CHARACTERISTICS (continued +2.35V to +5.5V +1.65V to +5.5V. When 0.33µ ...

Page 4

... MAX3381E 250 MAX3380E 460 0.15 = 100pF L 0.15 200 +25° +25° +25° +25° 3kΩ 1000pF, data rate is 250kbps MAX3380E SLEW RATE vs. LOAD CAPACITANCE OUT +2. OUT 2000 2500 3000 0 500 1000 1500 ...

Page 5

... C = 1000pF, data rate is 250kbps TRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE ( OUT 20kbps V OUT 2500 3000 2.5 3.5 SUPPLY VOLTAGE (V) SUPPLY CURRENT FALLING) CC 3.5 4.5 5.5 SUPPLY VOLTAGE (V) MAX3380E DATASTREAM V = +2.5V CC MAX3380E toc10 - +2. 1µs/div FALLING) CC 4.5 5.5 5 ...

Page 6

... IN (T1IN, T2IN) L (R2OUT, R1OUT) L the output voltage requirement allowing the charge pump to operate with supply voltages down to +2.35V. The MAX3380E/MAX3381Es’ internal power supply is a dual-mode regulated charge pump. The output regula- tion point depends For supply voltages above +3.7V, the charge pump will generate +5 ...

Page 7

... CC and the receivers remain active. When the power is off, drops below the CC the MAX3380E/MAX3381E permit the outputs to be dri- ven up to ±12V. The transmitter inputs have a 400kΩ active positive feedback resistor. They will retain a valid logic level if is between +2.5V the driving signal is removed or goes high impedance ...

Page 8

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins Table 1. AutoShutdown Plus Truth Table OPERATION FORCEON STATUS Shutdown X (Forced Off) Normal Operation 1 (Forced On) Normal Operation (AutoShutdown 0 Plus) Shutdown (AutoShutdown 0 ...

Page 9

... IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. Figure 2d. Power-Down Logic By connecting FORCEON and FORCEOFF to INVALID, the MAX3380E/MAX3381E are shut down when no valid receiver level is detected. Unlike other RS-232 interface devices where the receiv- er outputs swing between 0 and V MAX3381E feature a separate logic supply input (V ...

Page 10

... The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi- cally refer to ICs. The MAX3380E/MAX3381E help you design equipment that meets Level 4, the highest level of IEC 1000-4-2 without the need for additional ESD- protection components. The major difference between ...

Page 11

... Figure 8 shows a transmitter loopback test cir- cuit. Figure 9 shows a loopback test result for the MAX3380E at 460kbps with true RS-232 output voltage levels (V CC with RS-232-compatible levels (V data rates as high as 460kbps, the MAX3380E is com- patible with 2.5-Generation GSM standards. 5V/div 2V/div C2, C3, C4 (µF) 0.1 ...

Page 12

... RS-232 connections. The example shown in Figure 11 shows the ease of using the MAX3380E/MAX3381E in data cable applications. For best performance, keep the logic level lines short and use the RS-232 level lines to span any distance ...

Page 13

... T2IN 9 12 R2OUT 10 11 TSSOP ______________________________________________________________________________________ 47µF 0.1µ FORCEOFF FORCEON C1+ V+ 0.1µF C1- V- C2+ 0.1µF C2- MAX3380E/ MAX3381E T1IN T1OUT T2IN T2OUT R1OUT R1IN R2OUT R2IN INVALID TRANSISTOR COUNT: 1467 PROCESS: BiCMOS V CC FORCEOFF GND T1OUT T2OUT R1IN R2IN V L FORCEON R1OUT 0.1µ ...

Page 14

RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves ...

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