MM74C905N

Shift Registers Overview

The MM74C905N is a 12-bit successive approximation register manufactured by onsemi, housed in a 24-lead Plastic Dual-In-Line (PDIP) package. It operates within a supply voltage range of 3.0V to 15V and supports an operating temperature range from -40°C to +85°C. The device features a propagation delay of 80ns to 150ns at 10V and a maximum clock frequency of 5MHz to 10MHz. It provides high noise immunity with a typical margin of 0.45 VCC and low power consumption, drawing up to 300µA at 15V.

Shift Registers Feature Summary

• Supports START/STOP or continuous conversion modes for analog-to-digital applications
• Capable of driving ladder switches directly for networks with ten bits or fewer
• Provides provisions for register extension or truncation via the enable input

Shift Registers Applications

• Successive approximation analog-to-digital conversion systems
• Digital control and storage elements in repetitive routines
• Driving R/2R ladder networks in data acquisition circuits

Shift Registers Procurement Notes

Verify component authenticity as this part was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm that the specific unit matches the N24A package designation and JEDEC MS-011 standards. Check for RoHS compliance status if required by your manufacturing process, as older stock may not meet current environmental directives.

Shift Registers Selection Notes

Select this component when a 12-bit resolution is required for successive approximation architectures. Ensure the design accommodates the specified 3.0V to 15V supply range. Consider using buffer ICs like the MM74C902 or MM74C904 if direct drive of a full 12-bit 50k/100k ladder network is necessary to maintain resolution accuracy.

Shift Registers Part Context

This device belongs to the MM74C series of CMOS logic components. It functions specifically as a shift register optimized for SAR ADC control loops. Unlike general-purpose shift registers, it includes dedicated timing inputs for start and conversion complete signals, integrating control logic directly into the storage element.

Shift Registers Replacement Considerations

Public confirmed substitute part numbers: MM74C905, MM74C905N.