UM4258Q Datasheet, PDF (10/14 Pages) Union Semiconductor, Inc. – 4.5Ω 300MHz Bandwidth Dual SPDT Analog Switch

UM4258Q
Detailed Description
The UM4258Q high-speed, low-voltage, low on-resistance (R_ON), dual SPDT analog switch
operates from a single +1.8V to +5.5V supply. The switch features break-before-make switching
operation and fast switching speeds (t_ON = 80ns (max), t_OFF = 40ns (max)).
These switch has low 15pF on-channel capacitance, which allows for 12Mbps switching of the
data signals for USB 1.0/1.1 applications. The UM4258Q is designed to switch D₊ and D_- USB
signals with a guaranteed skew of less than 2ns (see Figure 4) as measured from 50% of the input
signal to 50% of the output signal.
Applications Information
Digital Control Inputs
The UM4258Q logic inputs accept up to +5.5V regardless of supply voltage. For example, with a
+3.3V supply, IN_ can be driven low to GND and high to +5.5V allowing for mixing of logic
levels in a system. Driving the control logic inputs rail-to-rail minimizes power consumption. For
a +3V supply voltage, the logic thresholds are 0.5V (low) and 1.4V (high); for a +5V supply
voltage, the logic thresholds are 0.8V (low) and 2.0V (high).
Analog Signal Levels
The on-resistance of the UM4258Q changes very little for analog input signals across the entire
supply voltage range (see the Typical Operating Characteristics). The switches are bidirectional,
so the NO_, NC_, and COM_ pins can be either inputs or outputs.
Power-Supply Sequencing and Over-voltage Protection
Proper power-supply sequencing is recommended for all CMOS devices. Always apply V₊
before applying analog signals, especially if the analog signal is not current-limited.
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http://www.union-ic.com Rev.02 Sep.2013
10/14