74ALS540

SN54ALS541, SN74ALS540, SN74ALS541 OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS SDAS025C – APRIL 1982 – REVISED JANUARY 1995 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers pnp Inputs Reduce dc Loading Data Flow-Through Pinout (All Inputs on Opposite Side From Outputs) Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description These octal buffers and line drivers are designed to have the performance of the popular SN54ALS240A/ SN74ALS240A series and, at the same time, offer a pinout with inputs and outputs on opposite sides of the package. This arrangement greatly facilitates printed-circuitboard layout. SN54ALS541 . . . J PACKAGE SN74ALS540, SN74ALS541 . . . DW OR N PACKAGE (TOP VIEW) OE1 A1 A2 A3 A4 A5 A6 A7 A8 GND 1 2 3 4 5 6 7 8 9 10 20 VCC 19 OE2 18 Y1 17 Y2 16 Y3 15 Y4 14 Y5 13 Y6 12 Y7 11 Y8 SN54ALS541 . . . FK PACKAGE (TOP VIEW) A2 A1 OE1 VCC OE2 The 3-state control gate is a 2-input NOR such that if either output-enable (OE1 or OE2) input is high, all eight outputs are in the high-impedance state. The SN74ALS540 provides inverted data. The ′ALS541 provide true data at the outputs. The -1 versions of SN74ALS540 and SN74ALS541 are identical to the standard versions, except that the recommended maximum IOL is increased to 48 mA. There is no -1 version of the SN54ALS541. A8 GND Y8 Y7 Y6 A3 3 2 1 20 19 4 18 Y1 A4 5 17 Y2 A5 6 16...