MAX3349EA Datasheet, PDF (8/17 Pages) Maxim Integrated Products – USB 2.0 Full-Speed Transceiver with UART Multiplexing Mode

USB 2.0 Full-Speed Transceiver with UART
Multiplexing Mode
Timing Diagrams
V_{USB_OHD}, V_OHD
t_FR, t_{FR_TUART}
90%
t_FF, t_{FF_TUART}
90%
10%
10%
V_{USB_OLD}, V_OLD
Figure 1. Rise and Fall Times
OE
D+/D-
t_{PLZ_DRV}
OE
D+/D-
VP/VM CONNECTED TO GND,
D+/D- CONNECTED
TO PULLUP
t_{PZL_DRV}
VP/VM CONNECTED TO V_L,
D+/D- CONNECTED
TO PULLDOWN
VP AND VM RISE/FALL TIMES < 4ns
VM
VP
t_{PLH_DRV}
t_{PHL_DRV}
D-
V_{CRS_F}
D+
Figure 2. Timing of VP and VM to D+ and D-
t_{PHZ_DRV}
t_{PZH_DRV}
Figure 3. Driver Enable and Disable Timing
+3V
D+/D-
0V
INPUT RISE/FALL TIME < 4ns
V_L
t_{PLH_RCV},
t_{PLH_SE}
RCV, VM, AND VP
Figure 4. D+/D- Timing to VP, VM, and RCV
t_{PHL_RCV},
t_{PHL_SE}
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