74F621

INTEGRATED CIRCUITS 74F621 Octal bus transceiver, non-inverting (open collector) Product specification IC15 Data Handbook 1996 Jan 05 Philips Semiconductors Philips Semiconductors Product specification Octal bus transceiver, non-inverting (open collector) 74F621 FEATURES High-impedance NPN base inputs for reduced loading (20µA in High and Low states) PIN CONFIGURATION OEAB 1 20 19 18 17 16 15 14 13 12 11 VCC OEBA B0 B1 B2 B3 B4 B5 B6 B7 Octal bidirectional bus interface Open collector outputs sink 64mA Non-inverting DESCRIPTION The 74F621 is an octal transceiver featuring non-inverting open collector bus-compatible outputs in both send and receive directions. The outputs are capable of sinking 64mA, providing very good capacitive drive characteristics. This octal bus transceiver is designed for asynchronous two-way communication between data buses. The control function implementation allows for maximum flexibility in timing. The device allows data transmission from the A bus to the B bus or from the B bus to the A bus, depending upon the logic levels at the Enable inputs (OEBA and OEAB). The Enable inputs can be used to disable the device so that the buses are effectively isolated. The dual-enable configuration gives the 74F621 the capability to store data by the simultaneous enabling of OEBA and OEAB. Each output reinforces its input in this transceiver configuration. Thus, when both control inputs are enabled and all other data sources to the two sets of t...