SN74LS623

OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUT The SN54 / 74LS623 series is an octal bus transceiver designed for asynchronous two-way communication between data buses. Control function implementation allows maximum timing flexibility. Enable inputs may be used to disable the device so that buses are effectively isolated. Depending on the Logic Levels at the enable inputs, Data transmission is allowed from the A bus to the B bus or from the B bus to the A bus. The dual-enable configuration gives the LS623 the capability to store data by simultaneous enabling of GBA and GAB. Each output reinforces its input in this transceiver configuration. Thus, when both control inputs are enabled all other data sources to the two sets of bus lines (16 in all) will remain at their last states. CONNECTION DIAGRAM (TOP VIEW) ENABLE VCC GBA B1 B2 B3 B4 B5 B6 B7 B8 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 ENABLE A1 A2 A3 A4 A5 A6 A7 A8 GND GAB BLOCK DIAGRAM 1/4 LS623 GBA GAB A1 B1 SN54/74LS623 OCT...