Document
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 requirements, high data-rate capabilities, and enhanced electrostatic 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 VL pin that allows interoperation in mixed-logic voltage systems. Both input and output logic levels are pin programmable through the VL pin. The MAX3386E is available in a space-saving TSSOP package.
Features
o VL 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 CBYPASS C1 0.1µF C2 0.1µF
Typical Operating Circuit
20 1 C1+ 3 4 C1C2+ C2SHDN
19 VCC
12 VL 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 VCC 18 GND 17 T1OUT
5
7 T1IN TTL/CMOS INPUTS
T1OUT 17 T2OUT 16 T3OUT 15 VL RS-232 OUTPUTS
8 T2IN 9 T3IN
MAX3386E
11 R1OUT
R1IN 14 5k VL RS-232 INPUTS
16 T2OUT 15 T3OUT 14 R1IN 13 R2IN
5k TTL/CMOS OUTPUTS 10 R2OUT
R2IN 13
12 VL 11 R1OUT
GND 18
TSSOP ________________________________________________________________ Maxim Integrated Products 1
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3.0V, ±15kV ESD-Protected RS-232 Transceiver for PDAs and Cell Phones MAX3386E
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V VL to GND...................................................-0.3V to (VCC + 0.3V) V+ to GND ................................................................-0.3V to +7V V- to GND .................................................................+0.3V to -7V V+ + V-(Note 1) .............................................................. +13V Input Voltages T_IN, SHDN to GND ...........................................-0.3V to +6V R_IN to GND ..................................................................±25V Output Voltages T_OUT to GND............................................................±13.2V R_OUT.....................................................-0.3V to (VL + 0.3V) Short-Circuit Duration T_OUT to GND........................Continuous Continuous Power Dissipation (TA = +70°C) 20-Pin TSSOP (derate 7.0mW/°C above +70°C) .......559mW Operating Temperature Ranges MAX3386ECUP .................................................0°C to +70°C MAX3386EEUP ..............................................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = VL = +3.0V to +5.5V; C1–C4 = 0.1µF, tested at +3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF, tested at +5.0V ±10%; TA = TMIN to TMAX; unless otherwise noted. Typical values are at VCC = VL = +3.3V, TA = +25°C.) PARAMETER Shutdown Supply Current Supply Current LOGIC INPUTS Input Logic Threshold Low T_IN, SHDN VL = 3.3V or 5.0V VL = 2.5V VL = 5.0V Input Logic Threshold High T_IN, SHDN VL = 3.3V VL = 2.5V VL = 1.8V Transmitter Input Hysteresis Input Leakage Current RECEIVER OUTPUTS Output Leakage Currents Output Voltage Low Output Voltage High RECEIVER INPUTS Input Voltage Range Input Threshold Low Input Threshold High Input Hysteresis Inp.