1 Features
• Adds two binary numbers
• Full internal lookahead
• Fast ripple carry for economical expansion
• Operates with both positive and negative logic
• Fanout (over temperature range)
– Standard outputs 10 LSTTL loads
– Bus driver outputs 15 LSTTL loads
• Wide operating temperature range: –55℃ to 125℃
• Balanced propagation delay and transition times
• Significant power reduction compared to LSTTL
Logic ICs
• 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 ≤ 1 μA at VOL, VOH

2 Description
The CDx4HC283 and CDx4HCT283 contain 4-bit
binary adders. The HCT device has TTL-voltage
compatible inputs.