HI-8420

December 2013 HI-8420, HI-8423 6-Channel / 8-Channel Discrete-to-Digital Interface Sensing Open / Ground Signals DESCRIPTION The HI-8420 is a six channel discrete-to-digital interface device. The HI-8423 has eight channels. Mixed-signal CMOS technology is used to provide superior low-power performance. The device inputs are configured to sense Ground / Open discrete signals. The device outputs are CMOS / TTL compatible and may be disabled (tri-state) using the CE and OE pins. The HI-8420 is a drop-in replacement for the DEI1026. For added functionality, the Holt HI-8422 offers eight channels of Open / Ground sensing and eight channels of 28V / Ground sensing in a single device. BLOCK DIAGRAM OE CE VDD IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 5K 5K 5K 5K 5K 5K 5K 5K GND 9K + - 9K + - 9K + - 9K + - 9K + - 9K + - 9K + - 9K + - 9K 5K 3.25V Reference OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 FEATURES ! 6 or 8 independent Open / Ground sensing channels ! 5.0V single supply operation ! Low powe...