cb-obs411 electrical mechanical data sheet - SE Spezial-Electronic ...

connectBlue10.2.1.2.2 Module output signals in a 5V host systemThe module output pins could require a buffer (see Figure 13) depending on the logic level requirements (see the Characteristicssection). HCT gates supplied with 5V can be used in a 5V host system with TTL or CMOS inputs (see Figure 13). LVC gates can maybebe used for output signals if the host input signals are TTL compatible (V IN_HIGH_MIN = 2V). LVC gate can not be used on 5V CMOShost input signals.The 74HCT08 gate is also available in a single and dual gate package (74AHCT1G08 and 74AHCT2G08).Figure 12: Logic levels interface to a 3/3.3V system. A protective 100Ohm resistor is used.Figure 13: Interface example with logic levels to a 5V system. The gate converting from host 5V output to module input can berepleced with an LVC gate if the voltage divider is removed.Copyright © 2010 connectBlue AB Page 31 of 42