DG221BDJ

Analog Switches, Multiplexers, Demultiplexers Overview

The DG221BDJ is a monolithic quad single-pole, single-throw (SPST) CMOS analog switch featuring independent onboard latches and a common write (WR) pin. It operates on dual supplies ranging from ±4.5 V to ±15 V with a maximum total supply of 30 V. The device provides a typical on-resistance of 60 Ω and handles continuous currents up to 20 mA. Key electrical parameters include a turn-on time of 550 ns, turn-off time of 340 ns, and input setup/hold times of 180 ns and 20 ns respectively. It functions within an operating temperature range of -40 °C to +85 °C.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Integrates four latchable SPST switches controlled by a common WR pin for memory mapping
• Features a 5 V on-chip regulator allowing wide power supply tolerance while maintaining TTL compatibility
• Provides true bidirectional signal switching with low on-resistance and high off-isolation

Analog Switches, Multiplexers, Demultiplexers Applications

• Microprocessor-based systems
• Automatic test equipment
• Communication systems
• Data acquisition systems
• Medical instrumentation

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm lead-free status and package type. The standard part number corresponds to the 16-pin plastic DIP package. Confirm RoHS compliance requirements as older manufacturing runs may contain leaded terminations. Ensure the design accounts for the absolute maximum ratings regarding voltage differentials and continuous current limits.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component when simultaneous control of multiple analog channels via a microprocessor bus is required. The integrated latches eliminate the need for external storage logic. Verify that the application voltage does not exceed the ±15 V limit and that the load current remains within the 20 mA continuous rating. Consider thermal derating if operating near the upper temperature limit.

Analog Switches, Multiplexers, Demultiplexers Part Context

This device belongs to the DG221B family of quad SPST analog switches manufactured by Vishay Siliconix. It is designed for precision switching in communication and instrumentation applications. The DG221BDJ specifically denotes the 16-pin Plastic DIP package variant. It shares functional similarities with other devices in the series but is distinguished by its latch architecture and bipolar supply operation.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

DG221BDJ-E3

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the Write (WR) pin function?

When WR is low, the input latches are transparent, allowing data to pass through. When WR goes high, the current state at the inputs is latched, maintaining the switch positions until the next write cycle.

What is the maximum analog signal range?

The analog signal range extends from the negative supply rail (V-) to the positive supply rail (V+), typically ±15 V.

Is the device compatible with TTL logic levels?

Yes, the internal 5 V regulator allows the digital inputs to remain compatible with TTL logic levels even when powered by wider supply voltages.