DG444CY

Overview

The DG444CY is a quad, single-pole/single-throw (SPST) analog switch manufactured by Analog Devices Inc./Maxim Integrated. It features four normally closed switches in a 16-pin Narrow SO package with an operating temperature range of 0°C to +70°C. Key electrical parameters include a maximum on-resistance of 85 Ohms, an on-resistance match between channels of 4 Ohms, and guaranteed on-resistance flatness of 9 Ohms over the signal range. The device supports single-supply operation from +10V to +30V or bipolar supplies from ±4.5V to ±20V. Switching times are specified with a maximum turn-on time of 250ns and a maximum turn-off time of 120ns. Power consumption is low at 35µW max, and charge injection is limited to 10pC max.

Feature Summary

• Features improved on-resistance matching between channels and guaranteed on-resistance flatness over the signal range for enhanced signal integrity.
• Offers low power consumption and low charge injection characteristics suitable for precision applications.
• Provides high electrostatic discharge tolerance per Method 3015.7.

Applications

• Sample-and-Hold Circuits
• Test Equipment
• Heads-Up Displays
• Guidance and Control Systems
• Military Radios

Procurement Notes

Verify the specific ordering suffix 'CY' corresponds to the 16-pin Narrow SO package and the commercial temperature range of 0°C to +70°C. Confirm that the component meets RoHS compliance requirements as indicated in the manufacturer's documentation. Ensure compatibility with TTL/CMOS logic levels by connecting VL appropriately. Check for any obsolescence notices or lifecycle status updates directly from Analog Devices.

Selection Notes

Select the DG444CY when a quad SPST configuration with normally closed contacts is required. This part is suitable for designs needing rail-to-rail signal handling and low leakage current. Consider the bipolar supply voltage range of ±4.5V to ±20V for optimal performance. Verify that the 85 Ohm maximum on-resistance meets the system's signal loss constraints.

Part Context

The DG444CY belongs to the DG444/DG445 family of improved, quad, SPST analog switches. It is fabricated using a 44V silicon-gate process. The DG444 variant specifically provides four normally closed switches, distinguishing it from the DG445 which offers normally open switches. Both share similar electrical characteristics and pinouts.

Replacement Considerations

The DG445CY is a direct functional substitute within the same family, differing only in having normally open switches instead of normally closed ones. Other variants like DG444DY offer the same functionality but with an extended industrial temperature range of -40°C to +85°C.

FAQ

What is the difference between the DG444 and DG445?

The DG444 contains four normally closed (NC) switches, while the DG445 contains four normally open (NO) switches. All other electrical specifications and pin configurations remain identical.

How does the DG444 handle overvoltage conditions?

Signals on S, D, or IN exceeding V+ or V- are clamped by internal diodes. For proper protection, external blocking diodes can be added if power-supply sequencing cannot be guaranteed.

What is the maximum charge injection for this device?

The DG444 guarantees a maximum charge injection of 10pC, which is an improvement over previous generations of analog switches.