器件名称:
MC74F257AJ
功能描述:
QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
文件大小:
78.07KB 共3页
简 介:
MC74F257A QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The MC74F257 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 true (non-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 Non-Inverting 3-State Outputs Input Clamp Diodes Limit High-Speed Termination Effects AC Enhanced Version of the F257 CONNECTION DIAGRAM VCC 16 OE 15 I0c 14 I1c 13 Zc 12 I0d 11 I1d 10 Zd 9 16 1 QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS FAST SCHOTTKY TTL J SUFFIX CERAMIC CASE 620-09 16 N SUFFIX PLASTIC CASE 648-08 1 1 S 2 I0a 3 I1a 4 Za 5 I0b 6 I1b 7 Zb 8 GND LOGIC DIAGRAM OE I0a I1a I0b I1b I0c I1c I0d I1d S 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION MC54FXXXAJ Ceramic MC74FXXXAN Plastic MC74FXXXAD SOIC LOGIC SYMBOL 1 Za Zb Zc Zd 4 Za Zb Zc Zd S OE I0a I1a I0b I1b I0c I1c I0d I1d 15 2 3 5 6 14 13 11 10 FUNCTION TABLE Output Enable OE H L L L L 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 L H L H H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care Z = High Impedance 7 12 9 VCC = PIN 16 GND = PIN 8 FAST AND LS TTL DATA 4-127 MC74F257A GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Opera……
