±15kV ESD-Protected USB Transceivers

______________________________________________________________________________________

11

Figure 3. Enable and Disable Timing, Driver

OE

D+/D-

VP/VM CONNECTED TO GND,

D+/D- CONNECTED TO PULLUP

D+/D- CONNECTED TO PULLDOWN

OE

D+/D-

DUT

+3V

150

Ω

150

Ω

VP/VM

D+/D-

Figure 4. Timing of D+ and D- to RCV, VM, and VP

+3V

0

RCV, VM, AND VP

D+ / D-

INPUT RISE/FALL TIME < 4ns

Figure 5. Enable and Disable Timing, Receiver

OE

VP/VM

VP/VM

D+/D- CONNECTED TO GND,

VP/VM CONNECTED TO PULLUP

D+/D- CONNECTED TO +3V,

VP/VM CONNECTED TO PULLDOWN

OE

DUT

+3V

560

Ω

560

Ω

VP/VM

D+/D-

Figure 6. Test Circuits

MAX3450E

MAX3451E

MAX3452E

RCV, VM,

AND VP

TEST

POINT

(a) LOAD FOR RCV, VM, AND VP

MAX3450E

MAX3451E

MAX3452E

D+ AND D-

24

Ω

15k

Ω

TEST

POINT

(b) LOAD FOR D+/D-