Renesas QS32X2384Q1G

Overview

QS32X2384Q1G from Renesas Electronics is a high-speed CMOS 20-bit bus switch with TTL-compatible I/O, four independent bus enable controls (BEA–BED), internal 25Ω series termination resistors, and operation across –40°C to +85°C. It enables bidirectional signal routing between two 20-bit buses (A0–A19 and B0–B19) for hot-swapping, voltage translation (5V ↔ 3.3V), and clock gating in industrial backplanes.

For engineers reviewing the QS32X2384Q1G datasheet, QS32X2384Q1G pinout, QS32X2384Q1G application, or QS32X2384Q1G equivalent, key selection criteria include ON-resistance (20–48 Ω), propagation delay ≤1.25 ns, isolation capacitance (5–7 pF off-state), undervoltage clamp diodes on all control inputs, and QVSOP-48 packaging compatibility with high-density PCB layouts.

Technical Context

The QS32X2384Q1G implements twenty independent N-channel FET switches without inherent body diodes to VCC, enabling true bidirectional signal flow and eliminating parasitic conduction paths. Each switch integrates 25Ω series termination to suppress reflection noise in high-speed digital buses up to 200 MHz.

Four dedicated enable inputs (BEA–BED) control disjoint 5-bit segments (A0–A4/B0–B4, A5–A9/B5–B9, A10–A14/B10–B14, A15–A19/B15–B19), allowing granular power gating and dynamic bus partitioning without affecting adjacent channels.

Key Specifications

Pinout & Package

QS32X2384Q1G is housed in a 48-pin QVSOP (Quad Very Small Outline Package) with 0.4 mm lead pitch, optimized for high-density routing and thermal performance in space-constrained industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3244DBR and PI3CH400QE, the QS32X2384Q1G uniquely combines 20-bit width, integrated 25Ω termination, industrial temperature rating, and –3 V undershoot clamping - making it the only option qualified for ruggedized hot-swap and mixed-voltage backplane applications.

Availability

QS32X2384Q1G is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-plug server modules, and voltage-translation bridges requiring stable component supply across extended temperature and long product lifecycles.

Supply support for QS32X2384Q1G 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT applications.

The QS32X2384Q1G belongs to Renesas' QuickSwitch® bus switch family, engineered specifically for high-speed digital bus isolation, hot-swap buffering, and voltage-domain bridging in industrial and telecom infrastructure.

FAQ

What is the maximum operating voltage for QS32X2384Q1G control inputs?

The QS32X2384Q1G control inputs (BEA–BED) tolerate –0.5 V to +7 V per absolute maximum ratings, with guaranteed logic HIGH at ≥2.0 V and logic LOW at ≤0.8 V under DC conditions. This range supports robust interfacing with diverse logic families and transient suppression via integrated undershoot clamp diodes, ensuring reliable enable/disable behavior even under noisy industrial supply conditions. The QS32X2384Q1G maintains functionality across its full industrial temperature range while sustaining these voltage tolerances.

Does QS32X2384Q1G support bidirectional signal flow without direction control pins?

Yes, the QS32X2384Q1G supports fully bidirectional signal flow between Bus A and Bus B without any direction control pin. Its enhanced N-channel FET architecture lacks an inherent body diode to V_CC, eliminating parasitic conduction paths and enabling true symmetrical signal transmission. This design allows the QS32X2384Q1G to pass data in either direction depending on source/sink configuration, making it ideal for shared-bus architectures like PCI Express sideband or JTAG daisy chains where polarity independence is required.

How does the integrated 25Ω series termination resistor benefit high-speed designs using QS32X2384Q1G?

The integrated 25Ω series termination resistor in each QS32X2384Q1G channel reduces signal reflections on PCB traces without requiring external components. This minimizes stub-induced ringing and improves eye diagram integrity at data rates exceeding 100 Mbps. By embedding termination directly at the switch output, the QS32X2384Q1G lowers total solution cost, saves board area, and eliminates layout sensitivity associated with discrete resistor placement - especially critical in dense backplane and modular computing applications.

What is the function of the four enable inputs (BEA, BEB, BEC, BED) on QS32X2384Q1G?

The four enable inputs (BEA, BEB, BEC, BED) on the QS32X2384Q1G independently control five-bit segments of the 20-bit bus: BEA manages A0–A4/B0–B4, BEB handles A15–A19/B15–B19, BEC covers A5–A9/B5–B9, and BED controls A10–A14/B10–B14. Each operates as an active-low signal, allowing selective activation or isolation of bus subsections. This segmentation enables granular power gating, dynamic bus partitioning, and fault containment - features essential for QS32X2384Q1G deployment in modular industrial controllers and hot-pluggable compute blades.

Is QS32X2384Q1G compatible with both 5V and 3.3V logic systems?

Yes, the QS32X2384Q1G is explicitly designed for voltage translation between 5V and 3.3V logic domains. Its TTL-compatible inputs accept 0.8 V/2.0 V thresholds and drive outputs compliant with 3.3V LVTTL levels, while supporting V_CC = 5.0 V ±5%. This dual-voltage capability allows the QS32X2384Q1G to serve as a seamless bridge - for example, connecting a 5V microcontroller to a 3.3V FPGA - without external level shifters, pull-ups, or voltage regulators, simplifying interconnect design and improving signal timing predictability.