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DM74LS257B 3-STATE Quad 2-Data Selectors/Multiplexers June 1989 Revised November 1999 DM74LS257B 3-STATE Quad 2-Data Selectors/Multiplexers General Description These Schottky-clamped high-performance multiplexers feature 3-STATE outputs that can interface directly with data lines of bus-organized
54LS240/74LS240 LSTTL 型八缓冲器/总线驱动器(三态、反相) 特点: • 三态输出驱动总线或缓冲存贮器地址寄存 器; • PNP 输入减小了直流负载; • 输入端上的滞后电压改善了噪声容限。 逻辑图 典型参数 tpd=10ns Pd=130mW 外引线�
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SN54/74LS298 QUAD 2-INPUT MULTIPLEXER WITH STORAGE The SN54 / 74LS298 is a Quad 2-Port Register. It is the logical equivalent of a quad 2-input multiplexer followed by a quad 4-bit edge-triggered register. A Common Select input selects between two 4-bit input ports (data sources.) The selected data
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DM74LS298 Quad 2-Port Register Multiplexer with Storage October 1988 Revised March 2000 DM74LS298 Quad 2-Port Register Multiplexer with Storage General Description The DM74LS298 is a quad 2-port register. It is the logical equivalent of a quad 2-input multiplexer followed by a quad 4-bit edge-trig
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