器件名称:
74HCT240
功能描述:
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
文件大小:
84.72KB 共6页
简 介:
SN54HCT240, SN74HCT240 OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS SCLS174C – MARCH 1984 – REVISED FEBRUARY 2000 D D D D Inputs Are TTL-Voltage Compatible 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers High-Current Outputs Drive up to 15 LSTTL Loads Package Options Include Plastic Small-Outline (DW), Thin Shrink Small-Outline (PW), and Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) DIPs SN54HCT240 . . . J OR W PACKAGE SN74HCT240 . . . DW, N, OR PW PACKAGE (TOP VIEW) description These octal buffers and line drivers are designed specifically to improve both the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The ’HCT240 devices are organized as two 4-bit buffers/drivers with separate output-enable (OE) inputs. When OE is low, the device passes inverted data from the A inputs to the Y outputs. When OE is high, the outputs are in the high-impedance state. The SN54HCT240 is characterized for operation over the full military temperature range of –55°C to 125°C. The SN74HCT240 is characterized for operation from –40°C to 85°C. FUNCTION TABLE (each buffer/driver) INPUTS OE L L H A H L X OUTPUT Y L H Z 1OE 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC 2OE 1Y1 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1 SN54HCT240 . . . FK PACKAGE (TOP VIEW) 1A2 2Y3 1A3 2Y2 1A4 4 5 6 7 8 3 2 1 20 19 18 17 16 15 14 9 ……
