SN74LS670

SN74LS670 4 x 4 Register File with 3−State Outputs The TTL/MSI SN74LS670 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. The 3-state outputs make it possible to connect up to 128 outputs 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. Simultaneous Read/Write Operation Expandable to 512 Words by n-Bits Typical Access Time to 20 ns 3-State Outputs for Expansion Typical Power Dissipation of 125 mW GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage TA Operating Ambient Temperature Range 4.75 5.0 5.25 V 0 25 70 °C IOH Output Current − High IOL Output Current − Low −2.6 mA 24 mA http://onsemi.com LOW POWER SCHOTTKY 16 1 PLASTIC N SUFFIX CASE 648 16 1 SOIC D SUFFIX CASE 751B ORDERING INFORMATION Device Package Shipping SN74LS670N 16 Pin DIP 2000 Units/Box SN74LS670D SOIC−16 38 Units/Rail SN74LS670DR2 SOIC−16 2500/Tape & Reel © Semiconductor Components Industries, LLC, 2006 1 July, 2006 − Rev. 8 Publication Order Number: SN74LS670/D SN74LS670 CONNECTION DIAGRAM DIP (TOP VIEW) VCC D1 WA WB EW ER Q1 Q2 16 15 14 13 12 11 10 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 2 3 4 56 78 D2 D3 D4 RB RA Q4 Q3 GND PIN NAMES D1 − D4 WA, WB EW RA...