Rochester Electronics 74HC677NT

This 16-bit address comparator simplifies the addressing of memory boards and/or other peripheral devices. The four P inputs are typically hard-wired to a preprogrammed address. An internal decoder determines whether the input applied to the A inputs must be low or high to drive the Y output low. For example, a positive-logic bit combination of 0111 (decimal 7) at the P inputs specifies that inputs A1 through A7 must be low and inputs A8 through A16 must be high to drive the output low. A match between the address applied at the A inputs and the preprogrammed address is indicated by a low output. The device features an enable (G) input. When G̅ is low, the device is enabled. When G̅ is high, the device is disabled and the output is forced high, regardless of the A and P inputs. The SN74ALS677A operates over a temperature range of 0℃ to 70℃.

• 16-bit address comparator with enable
• Package options include plastic small-outline (DW) and standard plastic (NT) 300-mil DIP packages

• Memory board addressing
• Peripheral addressing