1 Features
• Buffered inputs and outputs
• Four operating modes
• Typical propagation delay of 15ns at VCC = 5V, CL
= 15pF, TA = 25oC
• 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 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 compatability, VIL = 0.8
V (max), VIH = 2 V (min)
– CMOS input compatibility, II ≤ 1μA at VOL, VOH

2 Description
The CDx4HC(T)259 is an 8-bit addressable latch with
three active modes of operation (addressable latch,
memory, 8-line demultiplexer) and one reset mode.