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Evaluation Board for Quad T1/E1 Applications — LXD386
Developer Manual 23
Figure 12. Evaluation Board Schematic — LOS Detector
LOS 1 A4
FIREBIRD - LXD386 DEMO BOARD
B
46Wednesday, September 15, 1999
Title
Size Document Number Rev
Date: Sheet
of
VCC
VCC
VCC
VCC
VCC
VCC
LOS0
LOS1
LOS2
LOS3
+
C26
47uF TANT
+
C27
47uF TANT
+
C28
47uF TANT
+
C29
47uF TANT
R28
25K
R29
25K
R30
25K
R35
25K
U2A
74LS221
14
15
1
2
3
13
4
CEXT
REXT/CEXT
A
B
CLR
Q
Q
U2B
74LS221
6
7
9
10
11
5
12
CEXT
REXT/CEXT
A
B
CLR
Q
Q
U5A
74LS221
14
15
1
2
3
13
4
CEXT
REXT/CEXT
A
B
CLR
Q
Q
U5B
74LS221
6
7
9
10
11
5
12
CEXT
REXT/CEXT
A
B
CLR
Q
Q
U3A
74LS32
1
2
3
U3B
74LS32
4
5
6
U3C
74LS32
9
10
8
U3D
74LS32
12
13
11
D3
LED YEL.
D4
LED YEL.
D5
LED YEL.
D6
LED YEL.
U4A
74LS240
2
4
6
8
1
18
16
14
12
A1
A2
A3
A4
G
Y1
Y2
Y3
Y4
R31
330 Ohms
R32
330 Ohms
R33
330 Ohms
R34
330 Ohms
C18
.1uf
C25
.1uf
C21
.1uf
C19
.1uf
C20
.1uf
LOS0
LOS1
LOS2
LOS3
LEVEL ONE COMMUNICATIONS
U5U4
Decoupling
Caps
U3U2 X1