Analog Devices Inc. ADG3257BRQ

Overview

ADG3257BRQ from Analog Devices is a high-speed CMOS quad 2:1 multiplexer/demultiplexer bus switch with bidirectional signal routing, 2 Ω on-resistance, 100 ps propagation delay, and support for 933 Mbps data rates. It operates from a single 3.3 V or 5 V supply and enables level translation between 3.3 V/2.5 V or 5 V/3.3 V domains in memory interleaving and bus isolation applications.

For engineers reviewing the ADG3257BRQ datasheet, ADG3257BRQ pinout, ADG3257BRQ application, or ADG3257BRQ equivalent, key selection criteria include ultralow 1 nA quiescent current, standard 3257-type QSOP-16 pinout, off-state isolation during power loss, and verified mixed-voltage operation without external level shifters.

Technical Context

The ADG3257BRQ implements four independent, bidirectional 2:1 analog switches controlled by a shared select (S) and active-low enable (BE) logic. Each channel connects one of two B-port terminals (B1/B2) to its corresponding A-port terminal based on S state, while BE gates all channels simultaneously.

Its CMOS process delivers low on-resistance matching (ΔRON ≤ 0.2 Ω), sub-nanosecond propagation delay matching (≤ 0.04 ns), and rail-to-rail signal blocking in the off state - enabling clean bus switching without ground bounce or timing skew across memory or I/O subsystems.

Key Specifications

Pinout & Package

ADG3257BRQ is housed in a 16-lead QSOP package (RQ-16), measuring 3.9 mm × 4.9 mm × 1.5 mm, with gull-wing leads and JEDEC MO-137-AB compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switching applications.

Compared with TS3USB30E and SN74CBT3245APW, the ADG3257BRQ uniquely supports dual-supply operation (3.3 V/5 V), sub-2 Ω on-resistance, and built-in level translation - making it the only option among the three for mixed-voltage memory or processor bus interfacing.

Availability

ADG3257BRQ is available at Aetrix Electronics and suitable for industrial memory expansion, processor bus isolation, and mixed-voltage interface applications requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.

Supply support for ADG3257BRQ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets since 1965.

The ADG3257BRQ belongs to Analog Devices' precision bus switch product line, engineered specifically for low-distortion, high-speed signal routing in memory subsystems and multi-voltage SoC interconnects.

FAQ

What is the maximum data rate supported by the ADG3257BRQ?

The ADG3257BRQ supports a maximum data rate of 933 Mbps, as confirmed by eye diagram validation at both 622 Mbps and 933 Mbps under 5 V supply conditions. This performance is enabled by its 2 Ω on-resistance and 0.1 ns propagation delay, making ADG3257BRQ suitable for high-speed SDRAM address/control switching and parallel bus applications where timing margin is critical.

Does the ADG3257BRQ support level translation between different voltage domains?

Yes, the ADG3257BRQ supports bidirectional level translation: it can translate between 3.3 V and 2.5 V when powered from 3.3 V (output clamped to ~2.3 V), and between 5 V and 3.3 V using an external series diode on VCC to reduce internal gate voltage. This capability is explicitly documented in the Applications Information section of the ADG3257BRQ datasheet and does not require additional logic or external translators.

What happens to the ADG3257BRQ switches when the power supply is removed?

When VCC is removed, the ADG3257BRQ switches remain in the off state, providing full isolation between Port A and Port B. This fail-safe behavior is guaranteed by the device's architecture and is critical for protecting unpowered downstream circuits from backfeeding - a feature confirmed in the General Description and Absolute Maximum Ratings sections of the ADG3257BRQ datasheet.

Is the ADG3257BRQ pin-compatible with other devices in the ADG3257 family?

Yes, the ADG3257BRQ uses the standard 3257-type pinout defined in the Pin Configuration section and shares identical pin assignments with all ADG3257 variants (e.g., ADG3257BRUZ, ADG3257BN). This includes identical placement of A/B ports, S, BE, VCC, and GND - enabling direct substitution within the same QSOP-16 footprint without layout changes.

What is the operating temperature range for the ADG3257BRQ?

The ADG3257BRQ is rated for industrial operation from −40°C to +85°C, as specified in the Ordering Guide and Absolute Maximum Ratings tables. This range is validated across all electrical parameters including on-resistance, propagation delay, and leakage current, ensuring reliable performance in embedded controllers, motor drives, and industrial PLCs where ambient temperatures exceed commercial limits.