Ultra-Thin Dual and Quad Channel Bus Multiplexer/Demultiplexer to Reduce Board Space

17 January 2020 - 0 Comments

Diodes Incorporated has announced four new quad and dual-channel 4:1 and 2:1 bus switches in an ultra-thin QFN (UQFN) package. The UQFN package allows the OEMs to increase the PCB density and reduce the product dimensions of PC notebooks and tablets as well as networking and telecommunications equipment. Discrete logic devices, such as bus multiplexers and demultiplexers remain a critical element of embedded design. The UQFN package measures just 3mm × 3mm × 0.65mm high, which is significantly smaller than comparable devices in standard packages. This smaller size allows the bus switches to be added to almost any design, even those with a high level of component density.

Features of Dual 4:1 Bus Switch (PI3B3253)

High signal passing bandwidth (500 MHz)
Beyond Rail-to-Rail switching: 0 to 5V switching with 3.3V power supply, 0 to 3.3V switching with 2.5V power supply.
5V I/O tolerant with supply in OFF and ON state
1.8V, 2.5V, and 3.3V supply voltage operation
Hot Insertion Capable
Industrial Operating Temperature: –40ºC to +85ºC
8kV ESD Protection (human body model)
Latch-up Performance: >200mA per JESD17
Packaging (Pb-free & Green available):16-pin 173-mil wide plastic TSSOP (L), 16-pin 150-mil wide plastic QSOP (Q)

Features of Dual 4:1 Bus Switch (PI3B3257)

Fast Switching Speed: 4.8ns max.
Ultra-Low Quiescent Power: 0.1μA typical: Ideally suited for notebook applications
Pin compatible with 74 series 257 logic devices
Packaging (Pb-free & Green available):16-pin 150 mils wide plastic QSOP (Q), 16-pin 150 mils wide plastic SOIC (W), 16-pin 173 mil wide plastic TSSOP (L)

Features of Quad 2:1 Bus Switch (PI3CH480)

High signal passing bandwidth (500 MHz)
Beyond Rail-to-Rail switching:0 to 5V switching with 3.3V power supply, 0 to 3.3V switching with 2.5V power supply.
5V I/O tolerant with supply in OFF and ON state
1.8V, 2.5V, and 3.3V supply voltage operation
Hot Insertion Capable
Industrial Operating Temperature: –40ºC to +85ºC
8kV ESD Protection (human body model)
Latch-up Performance: >200mA per JESD17
Packaging (Pb-free & Green available) :16-pin 173-mil wide plastic TSSOP (L), 16-pin 150-mil wide plastic QSOP (Q)

Features of Quad 2:1 Bus Switch (PI5C3257)

Direct bus connection when switches are ON
Ultra-Low Quiescent Power (0.2μA typical): Ideally suited for notebook applications
Pin compatible with 74 series 257 logic devices
Packaging (Pb-free & Green available):16-pin 150-mil wide plastic QSOP (Q), 16-pin 150-mil wide plastic SOIC (W), 16-pin 173-mil wide plastic TSSOP (L)

Note: More technical details can be found in the datasheet given at the bottom of this page.

All 4 devices have Near-Zero propagation delay and have 5Ω switches connecting inputs to outputs. They offer tri-state operation, presenting high-impedance outputs when the enable pin is held high.

Each channel in the bus can multiplex/demultiplex a single output from between two or four inputs. While the path for all channels is selected through common inputs, the channels benefit from a dedicated active-low enable control, allowing each channel to be operated independently. For more information about the PI3B3253 and PI3B3257 (dual, 4:1) and PI3CH480 and PI5C3257 (quad, 2:1), visit the official website of Diodes Incorporated.