器件名称: 74F148SJ
功能描述: 8-Line to 3-Line Priority Encoder
文件大小: 61.62KB 共6页
简 介:74F148 8-Line to 3-Line Priority Encoder
April 1988 Revised July 1999
74F148 8-Line to 3-Line Priority Encoder
General Description
The F148 provides three bits of binary coded output representing the position of the highest order active input, along with an output indicating the presence of any active input. It is easily expanded via input and output enables to provide priority encoding over many bits.
Features
s Encodes eight data lines in priority s Provides 3-bit binary priority code s Input enable capability s Signals when data is present on any input s Cascadable for priority encoding of n bits
Ordering Code:
Order Number 74F148SC 74F148SJ 74F148PC Package Number M16A M16D N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Truth Table
Inputs EI H L L L L L L L L L I0 X H X X X X X X X L I1 X H X X X X X X L H I2 X H X X X X X L H H I3 X H X X X X L H H H I4 X H X X X L H H H H I5 X H X X L H H H H H I6 X H X L H H H H H H Outputs I7 GS A0 A1 A2 EO X H L H H H H H H H H H L L L L L L L L H H L H L H L H L H H H L L H H L L H H H H L L L L H H H H H L H H H H H H H H
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
1999 Fairch……
