Datasheet
R
PU
+
V
DPU
* 0.35 V
0.015 A
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
0.1
1
10 100 1000
Gain (dB)
Frequency (MHz)
PCA9306
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SCPS113J –OCTOBER 2004–REVISED OCTOBER 2010
Sizing Pullup Resistor
The pullup resistor value needs to limit the current through the pass transistor, when it is in the on state, to about
15 mA. This ensures a pass voltage of 260 mV to 350 mV. If the current through the pass transistor is higher
than 15 mA, the pass voltage also is higher in the on state. To set the current through each pass transistor at 15
mA, the pullup resistor value is calculated as:
The following table summarizes resistor values, reference voltages, and currents at 15 mA, 10 mA, and 3 mA.
The resistor value shown in the +10% column (or a larger value) should be used to ensure that the pass voltage
of the transistor is 350 mV or less. The external driver must be able to sink the total current from the resistors on
both sides of the PCA9306 device at 0.175 V, although the 15 mA applies only to current flowing through the
PCA9306 device.
PULLUP RESISTOR VALUES
(1) (2)
PULLUP RESISTOR VALUE (Ω)
15 mA 10 mA 3 mA
V
DPU
NOMINAL +10%
(3)
NOMINAL +10%
(3)
NOMINAL +10%
(3)
5 V 310 341 465 512 1550 1705
3.3 V 197 217 295 325 983 1082
2.5 V 143 158 215 237 717 788
1.8 V 97 106 145 160 483 532
1.5 V 77 85 115 127 383 422
1.2 V 57 63 85 94 283 312
(1) Calculated for V
OL
= 0.35 V
(2) Assumes output driver V
OL
= 0.175 V at stated current
(3) +10% to compensate for V
DD
range and resistor tolerance
PCA9306 Bandwidth
The maximum frequency of the PCA9306 is dependent on the application. The device can operate at speeds of
> 100MHz given the correct conditions. The maximum frequency is dependent upon the loading of the
application. The PCA9306 behaves like a standard switch where the bandwidth of the device is dictated by the
on resistance and on capacitance of the device.
Figure 4 shows a bandwidth measurement of the PCA9306 using a two-port network analyzer.
Figure 4. Bandwidth
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