MIC2550 Micrel Semiconductor, MIC2550 Datasheet - Page 6

• Manufacturer Part Number: MIC2550
• Description: Universal Serial Bus Transceiver Advance Information
• Manufacturer: Micrel Semiconductor

MIC2550
Test Circuits
MIC2550
O
O
E
E
#
#
=
=
V
D
0
0
1
1
0
0
1
1
0
1
P
+
T (
(
R
a r
e
c
n
n I
n I
e
s
v i
p
p
m
t u
t u
e
i
: )
: ) t
V
D
0
1
0
1
0
1
0
1
M
–
Load for Enable and Disable Time (D+/D–)
C
C
C
*1.5k on D– for low speed or D+ for high speed
L
L
L
= 50pF, full speed
= 50pF, low speed (minimum timing)
= 600pF, low speed (maximum timing)
Device
For D+/D–:
V = 0V for t
V = V
Under
Test
Device
Under
Test
BUS
V
Table 1. Truth Table
P
D
V
Device
Under
, V
for t
0
0
1
1
0
0
1
1
D+ and D– Load
Test
P
+
PZH
M
PZL
24
, and RCV Load
15k
and t
and t
24
50pF
6
PHZ
PLZ
Test
Point
C
O
O
L
u
u
V
D
500
p t
0
1
0
1
p t
0
1
0
1
M
–
25pF
t u
t u
1.5k *
V
V
TRM
R
R
C
X
X
C
X
X
0
1
0
1
V
V
U
U
L
L
L
L
R
n
R
n
o
o
o
o
d
d
S
S
e
e
g
g
g
g
f e
f e
E
E
s
s
c i
c i
c i
c i
u
u
0
n i
0
n i
t l
t l
0
1
0
1
e
e
d
d
October 4, 1999
Micrel