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| DS1228 DS1228 +5V Powered Dual RS-232 Transmitter/Receiver FEATURES PIN ASSIGNMENT C1+ V+ C1C2+ C2VT2OUT R2IN 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC GND T1OUT C1+ V+ R1IN C1R1OUT C2+ T1IN C2V1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC GND T1OUT R1IN R1OUT T1IN T2IN R2OUT * Operates from a single 5V power supply * Two drivers and two receivers * Meets all EIA RS-232-C specifications * On-board voltage doubler * On-board voltage inverter * + 30V input levels * + 9V output levels with + 5V supply * Low-power CMOS * Pin-compatible with the MAX 232 * Optional 16-pin SOIC surface mount package PIN DESCRIPTION C1+, C1 C2+, C2 V+, VT1IN, T2IN T1OUT, T2OUT R1IN, R2IN R1OUT, R2OUT VCC GND - - - - - - - - - Capacitor 1 Connections Capacitor 2 Connections + 10 Volts Transmitter In Transmitter Out Receiver In Receiver Out +5 Volts Ground T2IN T2OUT R2OUT R2IN 16-Pin DIP (300 MIL) 16-Pin SOIC (300 MIL) DESCRIPTION The DS1228 is a dual RS-232-C Receiver/Transmitter that meets all EIA specifications while operating from a single, +5 volt supply. The DS1228 has two internal charge pumps. One of the charge pumps is used to generate +10 volts. The other is used to generate -10 volts. The DS1228 also contains four level translators. Two of the level translators are RS-232 transmitters which convert TTL/CMOS inputs into +9V RS-232 outputs. The other two level translators are capable of operating with up to +30V inputs. The DS1228 is suitable for all RS-232 communications and is particularly valuable where higher voltage power supplies for RS-232 drivers are not available. The power supply section of the DS1228 supplies +10 volts from the VCC input. See the DS1229 data sheet for electrical specifications and operation. ECopyright 1995 by Dallas Semiconductor Corporation. All Rights Reserved. For important information regarding patents and other intellectual property rights, please refer to Dallas Semiconductor databooks. 021792 1/1 |
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