SN54AS573A

SN54ALS573C, SN54AS573A, SN74ALS573C, SN74AS573A OCTAL DĆTYPE TRANSPARENT LATCHES WITH 3ĆSTATE OUTPUTS SDAS048D − DECEMBER 1989 − REVISED JANUARY 1995 3-State Buffer-Type Outputs Drive Bus Lines Directly Bus-Structured Pinout True Logic Outputs Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), Standard Plastic (N) and Ceramic (J) 300-mil DIPs, and Ceramic Flat (W) Packages description These octal D-type transparent latches feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. SN54ALS573C, SN54AS573A . . . J OR W PACKAGE SN74ALS573C, SN74AS573A . . . DW OR N PACKAGE (TOP VIEW) OE 1 1D 2 2D 3 3D 4 4D 5 5D 6 6D 7 7D 8 8D 9 GND 10 20 VCC 19 1Q 18 2Q 17 3Q 16 4Q 15 5Q 14 6Q 13 7Q 12 8Q 11 LE SN54ALS573C, SN54AS573A . . . FK PACKAGE (TOP VIEW) 1Q VCC OE 1D 2D While the latch-enable (LE) input is high, outputs (Q) respond to the data (D) inputs. When LE is low, the outputs are latched to retain the data that was set up. A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or low) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and the increased drive provide the capability to drive bus lines ...