MAX563 19-0198 Rev 0 10/93 +3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown General Description Features The MAX563 is a +3.3V-powered EIA/TIA-562 transceiver Guaranteed Interoperability with RS-232 with two transmitters and two receivers. Because it imple- ments the EIA/TIA-562 standard, the MAX563 communi- Operates from a Single +3.0V to +3.6V Supply cates with RS-232 transceivers, yet consumes far less 2 Drivers, 2 Receivers power this makes it ideal for battery-powered, hand-held computers. And, the MAX563 guarantees a 116kbps data Receivers Active in Shutdown Mode rate while maintaining 3.7V EIA/TIA-562 signal levels, which makes it compatible with LapLink software. Low-Power Shutdown: 10A Max An on-board charge pump converts the +3.3V supply to Small Package18-Pin Wide SO the 6.6V needed to produce the EIA/TIA-562 output volt- age levels. Four 0.1F charge-pump capacitors and a Three-State TTL/CMOS Receiver Outputs bypass capacitor of similar size are the only external com- ponents required. 116kbps Guaranteed Data Rate When the MAX563s charge pumps and transmitters are shut down to save power, the receivers remain active to continuously monitor signals from external devices (for example, ring indicator from modems). The two receivers Ordering Information outputs can be enabled and disabled independently of the shutdown function to allow two portsgenerally of different PART TEMP. RANGE PIN-PACKAGE typesto be wire-OR connected at the UART. MAX563CPN 0C to +70C 18 Plastic DIP Applications MAX563CWN 0C to +70C 18 Wide SO Handiterminals MAX563C/D 0C to +70C Dice * Battery-Powered Equipment * Dice are specified at T = +25C. A Bar-Code Readers Notebook and Palmtop Computers Typical Operating Circuit Pin Configuration +3.3V C3 ALL CAPACITORS 0.1F +6.6V 17 TOP VIEW 3 2 V C1+ CC V+ C1 VOLTAGE DOUBLER 4 C1- EN 1 18 SHDN 5 -6.6V C2+ 7 C1+ 2 17 V CC C2 C4 6 VOLTAGE INVERTER V- C2- V+ 3 16 GND V C1- 4 15 T1 CC OUT 400k MAX563 12 T1 T1 15 OUT IN C2+ 5 14 R1 IN CMOS RS-562 6 V C2- 13 R1 CC OUT 400k INPUTS OUTPUTS 11 T2 IN T2 8 OUT V- 7 12 T1 IN 8 T2 11 T2 13 R1 14 OUT IN OUT R1 IN R2 9 10 R2 IN OUT 5k CMOS RS-562/RS-232 INPUTS OUTPUTS 10 R2 R2 9 OUT IN DIP/SO 18 5k SHDN ON/OFF 1 EN GND LapLink is a registered trademark of Traveling Software, Inc. Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature.+3.3V-Powered, EIA/TIA-562 Dual Transceiver with Receivers Active in Shutdown ABSOLUTE MAXIMUM RATINGS Power Supply Ranges Continuous Power Dissipation (T = +70C) A Supply Voltage (V ) ...........................................-0.3V to +6V Plastic DIP....................................................................889mW CC Input Voltages Wide SO .......................................................................762mW T .........................................................-0.3V to (V -0.3V) Operating Temperature Range...............................0C to +70C IN CC R ...............................................................................25V Storage Temperature Range .............................-65C to +160C IN T (Note 1)...................................................................15V Lead Temperature (soldering, 10sec) .............................+300C OUT Output Voltages T .............................................................................15V OUT R ....................................................-0.3V to (V +0.3V) OUT CC Driver/Receiver Output Short Circuit to GND.........Continuous Note 1: Input voltage measured with T in high-impedance state. SHDN or V = 0V. OUT CC 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. ELECTRICAL CHARACTERISTICS (V = 3.0V to 3.6V, C1-C4 = 0.1F, T = T to T , unless otherwise noted.) CC A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS RS-562 TRANSMITTERS All transmitter outputs loaded with 3k to Output Voltage Swing 3.7 4.5 V GND Data Rate R = 3k, C = 1000pF, T = +25C 200 116 kbps L L A Input Logic Threshold Low V 0.6 V IL Input Logic Threshold High V 2.4 V IH SHDN = V 220 CC Logic Pull-Up/Input Current A SHDN = 0V 0.01 1 V = 3.6V, SHDN = 0V, V = 15V 0.01 10 CC OUT Output Leakage Current A 0.01 10 V = SHDN = 0V, V = 15V CC OUT Transmitter Output Resistance V = V+ = V- = 0V, V = 2V 300 10M CC OUT Output Short-Circuit Current V = 0V 15 60 mA OUT RS-232/RS-562 RECEIVERS Input Voltage Operating Range 25 V Input Threshold Low V V = 3.3V 0.4 V IL CC Input Threshold High V V = 3.3V 2.4 V IH CC SHDN = V = 3.3V (no hysteresis when CC Input Hysteresis 0.1 0.5 1.0 V SHDN = 0V) Input Resistance R 35 7 k IN Output Voltage Low V I = 3.2mA 0.2 0.4 V OL OUT Output Voltage High V I = -0.5mA V -0.6 V -0.2 V OH OUT CC CC Output Leakage Current EN = V , 0V V V 0.05 10 A CC OUT CC EN Input Threshold Low V 0.6 V IL V 2.4 V EN Input Threshold High IH 2 MAX563