SN54AS240A

SN54ALS240A, SN54AS240A, SN74ALS240A, SN74AS240A OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS SDAS214E – DECEMBER 1982 – REVISED AUGUST 2002 D 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers D pnp Inputs Reduce dc Loading SN54ALS240A, SN54AS240A . . . J OR W PACKAGE SN74ALS240A . . . DB, DW, N, OR NS PACKAGE SN74AS240A . . . DW OR N PACKAGE (TOP VIEW) description/ordering information These octal buffers/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. When these devices are used with the ’ALS241, ’AS241A, ’ALS244, and ’AS244A devices, the circuit designer has a choice of selected combinations of inverting and noninverting outputs, symmetrical active-low output-enable (OE) inputs, and complementary OE and OE inputs. These devices feature high fan-out and improved fan-in. The -1 version of SN74ALS240A is identical to the standard version, except that the recommended maximum IOL for the -1 version is 48 mA. There is no -1 version of the SN54ALS240A. 1OE 1 1A1 2 2Y4 3 1A2 4 2Y3 5 1A3 6 2Y2 7 1A4 8 2Y1 9 GND 10 20 VCC 19 2OE 18 1Y1 17 2A4 16 1Y2 15 2A3 14 1Y3 13 2A2 12 1Y4 11 2A1 SN54ALS240A, SN54AS240A . . . FK PACKAGE (TOP VIEW) 2Y4 1A1 1OE VCC 2OE 1A2 3 2 1 20 19 4 18 1Y1 2Y3 5 17 2A4 1A3 6 16 1Y2 2Y2 7 15 2A3 1A4 8 14 1Y3 9 10 11 12 13 2Y1 GND 2A1 1Y4 2A2 ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TO...