+5 V Powered a RS-232/RS-422 Transceiver AD7306 FEATURES FUNCTIONAL BLOCK DIAGRAM RS-232 and RS-422 on One Chip Single +5 V Supply 0.1 mF Capacitors 1 V+ 24 V Short Circuit Protection 2 23 C1+ C2 Excellent Noise Immunity Low Power BiCMOS Technology 3 C1 22 C2+ High Speed, Low Skew RS-422 Operation R2 4 21 R2 IN OUT 408C to +858C Operations T1 5 20 T1 OUT IN APPLICATIONS T2 T2 6 AD7306 19 IN DTE-DCE Interface OUT SOIC Packet Switching V 7 18 CC GND TOP VIEW Local Area Networks (Not to Scale) R1 (B) 8 17 R1 IN OUT Data Concentration R1 /R1 (A) Data Multiplexers T3 9 16 IN IN IN Integrated Services Digital Network (ISDN) T3 (B) OUT 10 15 232/422 SEL T3 (A) 11 14 OUT GND GENERAL DESCRIPTION The AD7306 line driver/receiver is a 5 V monolithic product 12 13 NC NC which provides an interface between TTL signal levels and dual NC = NO CONNECT standard EIA RS-232/RS-422 signal levels. The part contains two RS-232 drivers, one RS-422 driver, one RS-232 receiver, The RS-232 channels are suitable for communications rates up and one receiver path which can be configured either as RS-232 to 100 kHz and the RS-422 channels are suitable for high speed or as RS-422. communications up to 5 MHz. The RS-422 transmitter comple- An internal charge pump voltage converter facilitates operation mentary outputs are closely matched and feature low timing from a single +5 V power supply. The internal charge pump skew between the complementary outputs. This is often an es- generates 10 V levels allowing RS-232 output levels to be de- sential requirement to meet tight system timing specifications. veloped without the need for external bipolar power supplies. All inputs feature ESD protection, all driver outputs feature A highly efficient charge pump design allows operation using high source and sink current capability and are internally pro- non polarized, miniature 0.1 F capacitors. This gives a consid- tected against short circuits on the outputs. An epitaxial layer is erable saving in printed circuit board space over conventional used to guard against latch-up. products which can use up to 10 F capacitors. The charge The part is available in a 24-lead SOIC and 24-pin plastic DIP pump output voltages may also be used to power external cir- package. cuitry which requires dual supplies. Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 2 2(V = +5 V 6 5%, C1 = C2 = C3 = C4 = 0.1 mF. All specifications T to CC MIN AD7306SPECIFICATIONS T unless otherwise noted.) MAX Parameter Min Typ Max Units Test Conditions/Comments RS-232 DRIVER TTL Input Logic Low, V 0.8 V INL TTL Input Logic High, V 2.0 V INH Input Logic Current 0.1 10 AV = 0 V to V IN CC RS-232 High Level Output Voltage 5.0 7.3 V R = 3 k L RS-232 Low Level Output Voltage 5.0 6.5 V R = 3 k L Output Short Circuit Current 5 12 mA V = 0 V, T = 0C to +70C OUT A Slew Rate 8 20 30 V/sC = 50 pF, R = 3 k L L 4V/sC = 2500 pF, R = 3 k L L Output Resistance (Powered Down) 300 10M V = 0 V, V = 3 V CC OUT RS-232 RECEIVER Input Voltage Range 15 +15 V RS-232 Input Threshold Low 0.8 1.3 V RS-232 Input Threshold High 1.7 2.4 V RS-232 Input Hysteresis 0.1 0.4 1.0 V RS-232 Input Resistance 3 5 7 k TTL Output Voltage Low, V 0.2 0.4 V I = +4 mA OL OUT TTL Output Voltage High, V 3.5 4.8 V I = 4 mA OH OUT RS-422 DRIVER TTL Input Logic Low, V 0.8 V INL TTL Input Logic High, V 2.0 V INH Logic Input Current 0.1 10 AV = 0 V to V IN CC Differential Output Voltage 5.0 V V = 5 V, R Diff = Figure 3 CC L 2VR Diff = 100 Figure 3 L Common-Mode Output Voltage 3 V V for Complementary O/P States 0.2 V R Diff = 100 OUT L Output Short Circuit Current 35 150 mA 0 V V +7 V CMR RS-422 RECEIVER Common-Mode Voltage Range 7 V Typical RS-422 Input Voltage <5 V Differential Input Threshold Voltage 0.2 +0.2 V Input Voltage Hysteresis 70 mV V = 0 V CM Input Resistance 3 5 7 k TTL Output Voltage Low, V 0.2 0.4 V I = +4.0 mA OL OUT TTL Output Voltage High, V 3.5 4.8 V I = 4.0 mA OH OUT 232/422 SEL Input Input Logic Low, V 0.8 V INL Input Logic High, V 2.0 V INH Logic Input Current 0.1 10 AV = 0 V to V IN CC POWER SUPPLY CURRENT I 10 15 mA Outputs Unloaded CC CHARGE PUMP VOLTAGE GENERATOR V+ Output Voltage 9 V RS-232 Output Unloaded See Typical Performance Curves V Output Voltage 9 V RS-232 Outputs Unloaded See Typical Performance Curves Generator Rise Time 200 s Specifications subject to change without notice. 2 REV. D