SN54LS170

SN54/74LS170 4 x 4 REGISTER FILE OPEN-COLLECTOR The TTL / MSI SN54 / 74LS170 is a high-speed, low-power 4 x 4 Register File organized as four words by four bits. Separate read and write inputs, both address and enable, allow simultaneous read and write operation. Open-collector outputs make it possible to connect up to 128 outputs in a wired-AND configuration to increase the word capacity up to 512 words. Any number of these devices can be operated in parallel to generate an n-bit length. The SN54 / 74LS670 provides a similar function to this device but it features 3-state outputs. 4 x 4 REGISTER FILE OPEN-COLLECTOR LOW POWER SCHOTTKY Simultaneous Read/ Write Operation Expandable to 512 Words of n-Bits Typical Access Time of 20 ns Low Leakage Open-Collector Outputs for Expansion Typical Power Dissipation of 125 mW J SUFFIX CERAMIC CASE 620-09 16 1 CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 D1 15 WA 14 WB 13 EW 12 ER 11 Q1 10 Q2 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 16 1 N SUFFIX PLASTIC CASE 648-08 16 1 D SUFFIX SOIC CASE 751B-03 1 D2 2 D3 3 D4 4 RB 5 RA 6 Q4 7 Q3 8 GND ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC PIN NAMES LOADING (Note a) HIGH LOW 0.25 U.L. 0.25 U.L. 0.5 U.L. 0.25 U.L. 0.5 U.L. 5 (2.5) U.L. LOGIC SYMBOL 12 14 13 5 4 WA EW WB RA RB ER 11 15 1 2 3 D1 D2 D3 D4 Q1 Q2 Q3 Q4 10 9 7 6 D1 – D4 WA, WB EW RA, RB ER Q1 – Q4 Data Inputs Write Address...