Analog Devices Inc. ADG3257BRQZ-REEL

Overview

ADG3257BRQZ-REEL from Analog Devices is a high-speed CMOS quad 2:1 multiplexer/demultiplexer bus switch with bidirectional signal routing, 2 Ω on-resistance, 0.1 ns 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 ADG3257BRQZ-REEL datasheet, ADG3257BRQZ-REEL pinout, ADG3257BRQZ-REEL application, or ADG3257BRQZ-REEL equivalent, key selection criteria include ultralow quiescent current (1 nA typical), 16-lead QSOP package compatibility, off-state isolation during power-down, and precise propagation delay matching (<0.04 ns) across all four channels.

Technical Context

The ADG3257BRQZ-REEL implements four independent, bidirectional 2:1 analog/digital switches controlled by a shared select (S) and active-low enable (BE) logic. Each switch connects one of two B-port terminals (B1/B2) to its corresponding A-port terminal based on S state, while BE gates overall channel activation.

Its CMOS process delivers 2 Ω typical on-resistance at 0 V input, <7 pF off-capacitance per port, and rail-to-rail signal blocking in the off state. The device maintains functional isolation when VCC = 0 V - critical for hot-swap and power sequencing in mixed-voltage systems.

Key Specifications

Pinout & Package

ADG3257BRQZ-REEL is housed in a 16-lead QSOP (RQ-16) package with standard 3257-type pinout and 0.635 mm lead pitch. The package is RoHS-compliant (Z suffix) and rated for reflow peak temperatures up to 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3257PW and TS3L501EPC, the ADG3257BRQZ-REEL uniquely combines 933 Mbps bandwidth, dual 3.3 V/5 V supply support, and intrinsic level translation - making it the only option among the three capable of seamless 5 V ↔ 3.3 V ↔ 2.5 V interoperability in a single device.

Availability

ADG3257BRQZ-REEL is available at Aetrix Electronics and suitable for industrial memory expansion, mixed-voltage bus isolation, and hot-swap I/O module design requiring stable component supply and long-term lifecycle assurance.

Supply support for ADG3257BRQZ-REEL 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 precision instrumentation, industrial automation, and communications markets since 1965.

The ADG3257BRQZ-REEL belongs to Analog Devices' high-speed bus switch product line, engineered specifically for low-latency, bidirectional signal routing in mixed-voltage computing and memory subsystems.

FAQ

What is the maximum data rate supported by the ADG3257BRQZ-REEL?

The ADG3257BRQZ-REEL supports a maximum data rate of 933 Mbps, verified through eye diagram testing at both 3.3 V and 5 V supply conditions. This performance enables use in high-speed parallel interfaces such as legacy PCI, SDR SDRAM, and industrial control buses where signal integrity and minimal propagation delay are critical. The ADG3257BRQZ-REEL achieves this without added timing skew due to its matched channel architecture.

Does the ADG3257BRQZ-REEL support level translation between different voltage domains?

Yes, the ADG3257BRQZ-REEL supports bidirectional level translation: it can interface 3.3 V to 2.5 V systems directly (with VCC = 3.3 V), and 5 V to 3.3 V systems using an external series diode on the 5 V supply rail. The internal threshold behavior limits output voltage to VCC − ~1 V, ensuring safe logic-level compatibility. This capability is inherent to the ADG3257BRQZ-REEL's architecture and does not require external biasing or direction control.

What happens to the ADG3257BRQZ-REEL switches when VCC is removed?

When VCC is removed or drops to 0 V, the ADG3257BRQZ-REEL switches remain in a fully off, high-impedance state - isolating Port A from Port B. This power-off isolation prevents backfeeding, eliminates bus contention during hot-swap events, and ensures safe operation in systems with uncontrolled power sequencing. The ADG3257BRQZ-REEL guarantees this behavior across its full industrial temperature range.

What is the on-resistance specification of the ADG3257BRQZ-REEL and why does it matter?

The ADG3257BRQZ-REEL has a typical on-resistance of 2 Ω at 0 V input voltage, with a maximum of 5 Ω across process/voltage/temperature extremes. This low RON minimizes voltage drop and signal attenuation in high-speed digital paths, preserves rise/fall times, and reduces ground bounce. For example, at 15 mA drive current, the ADG3257BRQZ-REEL introduces only ~30 mV drop - critical for maintaining noise margins in 3.3 V and 5 V logic families.

Is the ADG3257BRQZ-REEL pin-compatible with other industry-standard 3257-family devices?

Yes, the ADG3257BRQZ-REEL uses the standard 3257-type pinout as confirmed in the datasheet's Pin Configuration section (Figure 2) and Product Highlights. It shares identical pin assignments for all 16 leads with functionally similar devices like the SN74CBT3257 and TS3L501E, including A/B ports, S, BE, VCC, and GND. This allows direct PCB footprint reuse in designs migrating between vendors or evaluating alternatives - though electrical parameters (e.g., RON, speed, supply range) must still be verified per application.