Datasheet MAX220-MAX249 (Maxim) - 30

MAX220–MAX249 +5V-Powered, Multichannel RS-232 Drivers/Receivers +5V TOP VIEW 1μF 40 VCC
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16 TA1OUT +5V +5V TB1OUT 24 ENR 1 40 VCC 400kΩ TA1IN 2 39 ENT 2 TA1IN TB1IN 38 TA2IN 3 38 TB1IN 17 TA2OUT +5V +5V TB2OUT 23 TA3IN 4 37 TB2IN 400kΩ TA4IN 5 36 TB3IN 3 TA2IN TB2IN 37 RA5OUT 6 35 TB4IN MAX245 18 TA3OUT +5V +5V TB3OUT 22 RA4OUT 7 34 RB5OUT 400kΩ RA3OUT 8 33 RB4OUT 4 TA3IN TB3IN 36 RA2OUT 9 32 RB3OUT +5V +5V 19 TA4OUT TB4OUT 21 RA1OUT 10 31 RB2OUT 400kΩ RA1IN 11 30 RB1OUT 5 TA4IN TB4IN 35 RA2IN 12 29 RB1IN 1 ENR ENT 39 RA3IN 13 28 RB2IN 11 RA1IN RB1IN 29 RA4IN 14 27 RB3IN RA5IN 15 26 RB4IN 5kΩ 5kΩ TA1OUT 16 25 RB5IN 10 RA1OUT RB1OUT 30 TA2OUT 17 24 TB1OUT 12 RA2IN RB2IN 28 TA3OUT 18 23 TB2OUT TA4OUT 19 22 TB3OUT 5kΩ 5kΩ GND 20 21 TB4OUT 9 RA2OUT RB2OUT 31
DIP
13 RA3IN RB3IN 27 5kΩ 5kΩ 8 RA3OUT RB3OUT 32
MAX245 FUNCTIONAL DESCRIPTION
14 RA4IN RB4IN 26 10 RECEIVERS 5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE) 5kΩ 5kΩ 5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE) 8 TRANSMITTTERS 7 RA4OUT RB4OUT 33 4 A-SIDE TRANSMITTERS 15 RA5IN RB5IN 25 2 CONTROL PINS 1 RECEIVER ENABLE (ENR) 5kΩ 5kΩ 1 TRANSMITTER ENABLE (ENT) 6 RA5OUT RB5OUT 34 GND 20 Figure 21. MAX245 Pin Configuration and Typical Operating Circuit www.maximintegrated.com Maxim Integrated | 30