RS-485 receivers have no defined output for input levels between -200mV and +200mV. For the condition of 0V on the RS-485 side, a logic high is as probable on a receiver's TTL side as is a logic low. That ambiguity is present in a half-duplex connection if no master is transmitt...
The XR32220 product is a 2 driver/ 2 receiver RS-232 transceiver featuring a variable low voltage logic interface, down to 1.65V. This product is intended
Differential Line Driver, Quadruple, EIA-422, TTL Compatible, PDIP16 RS (Formerly Allied Electronics) Quadruple differential line driver 16-PDIP 0 to 70 Texas Instruments EAR99 AM26LS31 Tube RS422RS485 interface driver 5V 80mA 951.693491mg 20ns ...