74F845

74F845 8-Bit Transparent Latch April 1988 Revised August 1999 74F845 8-Bit Transparent Latch General Description The 74F845 bus interface latch is designed to eliminate the extra packages required to buffer existing latches and provide extra data width for wider address/data paths or buses carrying parity. The 74F845 is functionally- and pin-compatible with AMD’s Am29845. Features s 3-STATE outputs s Direct replacement for AMD’s Am29845 Ordering Code: Order Number 74F845SC 74F845SPC Package Number M24B N24C Package Description 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 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 © 1999 Fairchild Semiconductor Corporation DS009601 www.fairchildsemi.com 74F845 Unit Loading/Fan Out Pin Names D0–D7 O0–O7 OE1–OE3 LE CLR PRE Description Data Inputs Data Outputs Output Enables Latch Enable Clear Preset U.L. HIGH/LOW 1.0/1.0 150/40 1.0/1.0 1.0/1.0 1.0/1.0 1.0/1.0 Input IIH/IIL Output IOH/IOL 20 µA/−0.6 mA −3.0 µA/24 mA 20 µA/−0.6 mA 20 µA/−0.6 mA 20 µA/−0.6 mA 20 µA/−0.6 mA Functional Description The 74F845 consists of eight D-type latches with 3-STATE outputs. The flip-flops appear transparent to the data when Latch Enable (LE) is HIGH. This allows asynchronous operation as the output transition follows the data in transition. On the ...