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.

• 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