Analog Devices Inc./Maxim Integrated DG423DN

Overview

DG423DN from Maxim Integrated is a dual, single-pole/double-throw (SPDT) CMOS analog switch with latchable TTL/CMOS-compatible control inputs, fabricated in a 44V silicon-gate process. It features 20Ω typical on-resistance, 3Ω maximum on-resistance matching between channels, 15pC maximum charge injection, and rail-to-rail signal handling from ±4.5V to ±20V supplies. It is used in precision analog routing for test equipment and battery-powered communication systems.

For engineers reviewing the DG423DN datasheet, DG423DN pinout, DG423DN application, or DG423DN equivalent, this page delivers verified electrical parameters, latch timing behavior, break-before-make interval, off-isolation rejection ratio, and package-specific thermal and layout constraints - all confirmed for the 20-pin PLCC variant operating from –40°C to +85°C.

Technical Context

The DG423DN implements two independent SPDT switches with separate write (WR) and reset (RS) latches, enabling microprocessor-controlled analog path selection without continuous bus hold. Its logic interface accepts VL = +5V referenced to GND while supporting bipolar supply operation (±4.5V to ±20V) or single +10V to +30V operation.

Each switch exhibits matched rDS(ON) ≤ 3Ω (bipolar), flat on-resistance (≤ 4Ω over full signal range), and guaranteed <5nA off-leakage at +85°C. Break-before-make timing is 10ns minimum (tD), ensuring no signal shorting during state transitions.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Leaded Chip Carrier (PLCC), 0.453" square, JEDEC MS-018, lead-free option not available for DG423DN (RoHS/lead-free = No per Maxim documentation).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog switch applications.

Compared with MAX4623ESE+ and ADG423BRUZ, the DG423DN uniquely combines latch control, bipolar supply support up to ±20V, guaranteed break-before-make timing, and 3Ω rDS(ON) matching - making it irreplaceable in legacy industrial and military systems requiring deterministic, high-voltage analog switching.

Availability

DG423DN is available at Aetrix Electronics and suitable for test equipment multiplexing, modem signal routing, battery-powered data loggers, military radio front-ends, and PBX line-card designs requiring stable component supply across extended temperature ranges.

Supply support for DG423DN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DG423DN belongs to Maxim's DG42x family of latch-equipped CMOS analog switches, engineered specifically for µP-controlled signal routing in high-reliability, wide-supply-range systems where deterministic switching and channel matching are critical.

FAQ

What is the operating temperature range for the DG423DN?

The DG423DN is rated for –40°C to +85°C ambient operation, as specified in Maxim's ordering information table. This range applies to the 20-pin PLCC package variant and is validated across all electrical parameters including rDS(ON), leakage, and switching times. The device maintains <5nA off-leakage at +85°C and meets timing specs down to –40°C, making it suitable for industrial and automotive under-hood applications where thermal stability is essential. DG423DN performance remains within datasheet limits across this full range without derating.

Does the DG423DN require a separate logic supply voltage?

Yes, the DG423DN requires VL = +5V applied to Pin 15 for TTL-compatible logic operation. This supply is independent of V+ and V− and must be decoupled with a 0.1µF ceramic capacitor placed close to Pin 15. If VL is tied to V+, the device operates with CMOS-level thresholds instead of TTL, increasing VINH to ≥70% of V+. For guaranteed 2.4V logic-high recognition and interoperability with standard µPs, VL must be regulated at +5V. The DG423DN draws ≤5µA from VL under static conditions.

How does the latch function work on the DG423DN?

The DG423DN uses asynchronous WR (Pin 9) and RS (Pin 10) inputs to control internal D-type latches. A rising edge on WR captures the current states of IN1 and IN2, holding them until the next WR pulse. RS, when high, forces both switches OFF regardless of WR or IN states - acting as a hardware reset. This latch architecture eliminates bus contention and allows the µP to release control lines immediately after issuing a command, reducing EMI and software overhead. The DG423DN truth table confirms transparent operation when RS = 0 and WR = 1.

Can the DG423DN operate from a single +12V supply?

Yes, the DG423DN supports single-supply operation from +10V to +30V. With V+ = +12V and V− = 0V (GND), the analog signal range extends from 0V to +12V. However, note that on-resistance flatness (≤4Ω) and channel matching (≤3Ω) are guaranteed only under bipolar-supply conditions per Note 4 in the datasheet. Single-supply use is valid for general-purpose switching, but precision applications requiring tight rDS(ON) consistency should use ±4.5V to ±20V supplies. VL must still be +5V regardless of supply configuration.

What is the maximum allowable voltage difference between V+ and V− for the DG423DN?

The absolute maximum voltage difference between V+ and V− is +44V, as stated in the Absolute Maximum Ratings table. Exceeding this risks permanent damage due to junction breakdown. In practice, the DG423DN is characterized and guaranteed for operation up to ±20V (i.e., 40V total), and all electrical specifications - including rDS(ON), leakage, and switching speed - are validated within that range. For long-term reliability, maintain V+ − V− ≤ 40V and observe proper power sequencing: V+ first, then VL, then V−, then logic inputs.