USB DC Parameters
AT89C5131A-L
1 - VBUS
2-D-
3-D+
4 - GND
USB “B”
Receptacle
32
41
R
Rpad
Rpad
VREF
D+
D-
R = 1.5 kΩ
Rpad = 27Ω
Symbol Parameter
Min
Typ
Max
Unit
VREF USB Reference Voltage
3.0
VIH Input High Voltage for D+ and D- (Driven)
2.0
VIHZ Input High Voltage for D+ and D- (Floating)
2.7
VIL Input Low Voltage for D+ and D-
VOH Output High Voltage for D+ and D-
2.8
VOL Output Low Voltage for D+ and D-
0.0
3.6
V
V
3.6
V
0.8
V
3.6
V
0.3
V
17
4338A–USB–08/04