Datasheet

15
LTC1321/LTC1322/LTC1335
U
S
A
O
PP
L
IC
AT
I
WU
U
I FOR ATIO
5V
5V
18
10
1
24
5V
1
TXD
–
RXD
–
TXD
+
RXD
+
120Ω
2
LTC1320
1321/22/35 F15
TXD
TXI
7
3
4
1k1k
13
12
RXEN
5
6
19
LTC1335
16
R
A1
2
3
8
7
6
11
12
15
DE1
D
Y1
17
5V
5V
18
14
13
–5V
120Ω
22Ω
100pF
22Ω
SEL1, 5V
SEL2, 5V
1k
1k
17
9
22
11
4
21
8
9
16
10
23
14
15
RXO
RXO
RXDO
5
20
OE
RFI
RFI
RFI
RFI
RFI
RFI
RFI
TXDEN
=
RFI
RFI
Figure 15. Apple LocalTalk Implemented Using
LTC1320 and LTC1335 Transceivers
5V
–5V
18
10
1
24
5V
1
TXD
–
RXD
–
RXI
TXD
+
RXD
+
2
LTC1320
1321/22/35 F16
TXD
TXI
7
3
4
13
12
5
6
19
LTC1335
16
R
A1
R
A2
2
3
8
7
6
11
12
15
DE1
D
Y1
D
Y2
D
Z2
17
5V
5V
18
14
13
–5V
22Ω
100pF
22Ω
SEL1, 5V
SEL2
17
9
22
11
421
8
9
16
10
23
14
15
RXO
RXDO
5
20
OE
RFI
RFI
TXDEN
RXEN
TXO
RXI
RXO
=
120Ω
120Ω
120Ω
120Ω
RFI
RFI
RFI
RFI
RFI
RFI
RFI
RFI
RFI
RFI
RFI
RFI
RFI
Figure 16. AppleTalk Direct Connect Using LTC1320
for DTE and LTC1335 for DCE Transceivers