1 Features
• Buffered inputs
• Three-state outputs
• Applications in multiple-data-bus architecture
• Fanout (over temperature range)
– Standard outputs : 10 LSTTL loads
– Bus driver outputs : 15 LSTTL loads
• Wide operating temperature range : -55oC to
125oC
• Balanced propagation delay and transition times
• Significant power reduction compared to LSTTL
logic IC's
• HC types
– 2 V to 6 V operation
– High noise immunity: NIL = 30%, NIH = 30% of
VCC at VCC = 5 V
• HCT types
– 4.5 V to 5.5 V operation
– Direct LSTTL input logic compatibility, VIL = 0.8
V(Max), VIH = 2 V(Min)
– CMOS input compatibility, II ≤ 1μA at VOL, VOH

2 Description
The CDx4HC640 and CDx4HCT640 are inverting
octal bus transceivers with 3-state outputs.