940 is controlled by a signal at output 955 from control circuitry 950 the switch closes responsive to the signal on the output 955 of control circuitry 950 being asserted which couples the voltage conditioning circuitry output 930 and resistor 210 to the contact 529 and thereby to the d u2212 line 212 the switch 940 opens responsive to the signal on the output 955 of control circuitry 950 being deasserted which decouples the voltage conditioning circuitry output 930 and resistor 210 from the contact 529 and thereby from the d u2212 line 212 fig1 illustrates a receiver 250 for a usb device 165 according to an embodiment of the present invention the receiver 250 includes a single input amplifier a 6 on the ic 530 coupled to contact 529 for receiving a d u2212 input signal from the host transmitter 260 a single input amplifier a 8 on the ic 530 coupled to contact 525 for receiving a d input signal from the host transmitter 260 and a differential amplifier a 7 on the ic 530 coupled to both the contacts for receiving both the d and d u2212 input signals according to one embodiment of the present invention the device 165 includes both the receiver 250 of fig1 and the low speed transmitter.