器件名称:
MC74AC258N
功能描述:
QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
文件大小:
178.47KB 共8页
简 介:
MC74AC258 MC74ACT258 Quad 2Input Multiplexer with 3State Outputs The MC74AC258/74ACT258 is a quad 2-input multiplexer with 3-state outputs. Four bits of data from two sources can be selected using a common data select input. The four outputs present the selected data in the complement (inverted) form. The outputs may be switched to a high impedance state with a HIGH on the common Output Enable (OE) input, allowing the outputs to interface directly with bus-oriented systems. Multiplexer Expansion by Tying Outputs Together Inverting 3-State Outputs Outputs Source/Sink 24 mA ′ACT258 Has TTL Compatible Inputs VCC 16 OE 15 I0c 14 I1c 13 Zc 12 I0d 11 I1d 10 Zd 9 QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS N SUFFIX CASE 648-08 PLASTIC PIN NAMES S OE I0a–I0d I1a–I1d Za–Zd Common Data Select Input 3-State Output Enable Input Data Inputs from Source 0 Data Inputs from Source 1 3-State Multiplexer Outputs D SUFFIX CASE 751B-05 PLASTIC 1 S 2 I0a 3 I1a 4 Za 5 I0b 6 I1b 7 Zb 8 GND TRUTH TABLE Output Enable OE H L L L L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance LOGIC SYMBOL Select Input S X H H L L Data Inputs I0 X X X L H I1 X L H X X Outputs Z Z H L H L S Za Zb Zc Zd OE I0a I1a I0b I1b I0c I1c I0d I1d FACT DATA 5-1 MC74AC258 MC74ACT258 FUNCTIONAL DESCRIPTION The MC74AC258/74ACT258 is a quad 2-input multiplexer with 3-state outputs. It selects four bits of data from two sources under control of a common Select input (S). When the S……
