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Custom Monolithic Four-Digit Counter and Digital Voltmeter (DVM) IC: A highly specialized monolithic integrated circuit (historically designated as the M187 architecture) packaged in a 20-pin dual in-line ceramic footprint, incorporating a multi-stage four-decade digital logic counter, an internal system data latch, and a calibrated digital-to-analog converter matrix to compute and drive delay telemetry. Unit Sourcing Compatibility: This component came out of the digital delay tracking, sweep voltmeter networks, and front-panel character readout drive circuit boards of the Tektronix 7B15, 7B85, and 7B87 high-frequency timebase horizontal plugin modules Show more