Rainbow Electronics AT89C5131 - Manual (Page 156)

156
AT89C5131
4136A–USB–03/03
USB DC Parameters
Symbol Parameter Min Typ Max Unit
V
REF
USB Reference Voltage 3.0 3.6 V
V
IH
Input High Voltage for D+ and D- (Driven) 2.0 V
V
IHZ
Input High Voltage for D+ and D- (Floating) 2.7 3.6 V
V
IL
Input Low Voltage for D+ and D- 0.8 V
V
OH
Output High Voltage for D+ and D- 2.8 3.6 V
V
OL
Output Low Voltage for D+ and D- 0.0 0.3 V
1 4
2 3
1 - V
BUS
2 - D -
3 - D +
4 - GND
USB “B”
Receptacle
V REF
D +
D -
R
Rpad
Rpad
R = 1.5 k Ω
R pad = 27 Ω