SN74F251B

3-State Versions of SN54F151B and SN74F151B 3-State Outputs Interface Directly With System Bus Performs Parallel-to-Serial Conversion Complementary Outputs Provide True and Inverted Data Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs SN54F251B, SN74F251B 1ĆOFĆ8 DATA SELECTORS/MULTIPLEXERS WITH 3ĆSTATE OUTPUTS SDFS066A − MARCH 1987 − REVISED OCTOBER 1993 SN54F251B . . . J PACKAGE SN74F251B . . . D OR N PACKAGE (TOP VIEW) D3 1 D2 2 D1 3 D0 4 Y5 W6 G7 GND 8 16 VCC 15 D4 14 D5 13 D6 12 D7 11 A 10 B 9C description These data selectors/multiplexers contain full binary decoding to select one of eight data sources and feature strobe-controlled complementary outputs. The 3-state outputs can interface with and drive data lines of busorganized systems. When the strobe (G) 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. The SN54F251B is characterized for operation over the full military temperature range of − 55°C to 125°C. The SN74F251B is characterized for operation from 0°C to 70°C. SN54F251B . . . FK PACKAGE (TOP VIEW) D2 D3 NC VCC D4 3 2 1 20 19 D1 4 18 D5 D0 5 17 D6 NC 6 16 NC Y7 15 D7 W 8 14 9 10 11 12 13 A G GND NC C B NC − No internal connection FUNCTION TABLE INPUTS SELECT C B A STROBE G OUTPUTS Y W X X X ...