SN54ALS251

3-State Version of the ′ALS151 3-State Outputs Interface Directly With System Bus Perform Parallel-to-Serial Conversion Complementary Outputs Provide True and Inverted Data Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description These data selectors/multiplexers contain full binary decoding to select one-of-eight data sources and feature controlled complementary 3-state outputs. The 3-state outputs can interface with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (at the high-impedance state), the low impedance of the signal-enabled output drives the bus line to a high or low logic level. Both outputs are controlled by the output-enable (OE) input. The outputs are disabled when OE is high. The SN54ALS251 is characterized for operation over the full military temperature range of − 55°C to 125°C. The SN74ALS251 is characterized for operation from 0°C to 70°C. SN54ALS251, SN74ALS251 1ĆOFĆ8 DATA SELECTORS/MULTIPLEXERS WITH 3ĆSTATE OUTPUTS SDAS215A − APRIL 1982 − REVISED DECEMBER 1994 SN54ALS251 . . . J PACKAGE SN74ALS251 . . . D OR N PACKAGE (TOP VIEW) D3 1 D2 2 D1 3 D0 4 Y5 W6 OE 7 GND 8 16 VCC 15 D4 14 D5 13 D6 12 D7 11 A 10 B 9C SN54ALS251 . . . FK PACKAGE (TOP VIEW) D4 VCC NC D3 D2 3 2 1 20 19 D1 4 18 D5 D0 5 17 D6 NC 6 16 NC Y7 15 D7 W8 14 A 9 10 11 12 13 B C NC GND OE NC − No internal connectio...