2911ADM/B

Overview

The Rochester Electronics LLC 2911ADM/B is a specialized integrated circuit belonging to the 2900 series of microprogram sequencers. Functionally compatible with industry-standard 2911A components, this device serves as a 4-bit wide address controller for sequencing through microinstructions stored in ROM or PROM. It features tristate outputs and an internal address register that updates on clock transitions. The component supports cascading to expand address width and includes a four-word push/pop stack for nested subroutine linkages.

Feature Summary

• Compatible with standard 2911A architecture for microcode machine emulation
• Features a 4-bit cascadable microprogram counter and internal address register
• Includes a 4x4 file with stack counter supporting nesting microsubroutines
• Supports branching via individual OR inputs for each bit

Applications

• Microcomputer system design
• Controller design requiring efficient microcode emulation
• Sequencing operations in ROM-based instruction sets

Procurement Notes

Verify the specific manufacturing lot and date code upon receipt, as Rochester Electronics sources devices from various original manufacturers. Confirm that the bulk packaging condition meets storage requirements. Ensure compatibility with existing system voltage levels and clock speeds before integration into final designs.

Selection Notes

Select this component when designing systems requiring a 4-bit address controller compatible with the 2900 series. Multiple units can be interconnected to generate larger address spaces, such as 8-bit or 12-bit addresses. Consider the need for nested subroutines and conditional branching capabilities inherent to the 2911A architecture.

Part Context

This part is part of the GPS 2900 Series of devices offered by Rochester Electronics. The series provides a building block approach to microcomputer design, allowing for expansion to emulate any microcode machine. Rochester Electronics specializes in extending the lifecycle of legacy semiconductor components.