The CD54HC245, CD54HCT245, and CD74HC245, CD74HCT245 are high-speed octal three-state bidirectional transceivers intended for two-way asynchronous communication between data buses. They have high drive current outputs which enable high-speed operation while driving large bus capacitances. They provide the low power consumption of standard CMOS circuits with speeds and drive capabilities comparable to that of LSTTL circuits.
●The CD54HC245, CD54HCT245, CD74HC245 and CD74HCT245 allow data transmission of the B bus or from the B bus to the A bus. The logic level at the direction input (DIR) determines the direction. The output enable input (OE\\), when high, puts the I/O ports in the high-impedance state.
●The HC/HCT245 is similar in operation to the HC/HCT640 and the HC/HCT643.
● Buffered Inputs
● Three-State Outputs
● Bus Line Driving Capability
● Typical Propagation Delay (A to B, B to A) 9ns at VCC = 5V, CL = 15pF, TA = 25°C
● Fanout (Over Temperature Range)
● Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
● Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
● Wide Operating Temperature Range . . . -55°C to 125°C
● Balanced Propagation Delay and Transition Times
● Significant Power Reduction Compared to LSTTL Logic ICs
● HC Types
● 2V to 6V Operation
● High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
● HCT Types
● 4.5V to 5.5V Operation
● Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
● CMOS Input Compatibility, Il ≤ 1µA at VOL , VOH
