1 of 8 Data Selector / Multiplexer
(with strobe and three-state outputs)
This data selector / multiplexer contains full on-chip binary decoding to select one-of-eight data sources and features a
strobe-controlled 3-state output.
The strobe must be at a low logic level to enable this device. The 3-state outputs permit a number of outputs to be
connected to a common bus.
When the strobe input is high, both outputs are in a high-impedance state in which both the upper and lower transistors
of each totem-pole output are off, and the output neither drives nor loads the bus significantly. When the strobe is low,
the outputs are activated and operate as standard TTL totem-pole outputs.
To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output
control circuitry is designed so that the average output disable time is shorter than the average output enable time.
• Ordering Information
HD74LS251FPEL SOP-16 pin (JEITA)
Note: Please consult the sales office for the above package availability.
EL (2,000 pcs/reel)
10 B Data Select
Rev.3.00, Jul.15.2005, page 1 of 5