LTC1321_15 Datasheet, PDF (15/20 Pages) Linear Technology – RS232/EIA562/RS485 Transceivers

APPLICATI S I FOR ATIO
LTC1321/LTC1322/LTC1335
1
TXD
TXI ²
3
TXDEN
4
5
RXEN
6
RXO
RXO ⁷
RXDO ⁸
9
LTC1320
18 _5V
17 TXD^– _RFI
16 TXD⁺
RFI
15
14
5V
13
1k
1k
12
11
10
RXD ^–
RXD ⁺
RFI
RFI
120Ω
120Ω
22Ω
RFI ⁼
22Ω
100pF
OE ¹
1k
2
RFI
1k
3
RFI
RFI ⁴
RFI ⁵
SEL1, 5V ⁶
7
SEL2, 5V
8
9
10
11
12
Figure 15. Apple LocalTalk Implemented Using
LTC1320 and LTC1335 Transceivers
LTC1335
24
5V
23
22
R_A1
21 _DE1
20 _DY1
19 _5V
18
5V
17
16
15
14
13 _–5V
1321/22/35 F15
TXD ¹
TXI ²
3
TXDEN
4
5
RXEN
RXO ⁶
7
RXO
RXDO ⁸
9
LTC1320
18
5V
17 TXD^– _RFI
16 TXD⁺ _RFI
15 TXO _RFI
14 _{– 5V}
13 RXI _RFI
12 RXI
11 RXD^{– RFI}
RFI
10 RXD⁺
RFI
120Ω
120Ω
22Ω
RFI ⁼
22Ω
100pF
120Ω
120Ω
1
OE
2
RFI
3
RFI
4
RFI
RFI ⁵
SEL1, 5V ⁶
SEL2 ⁷
8
RFI
9
RFI
10
RFI
11
12
Figure 16. AppleTalk Direct Connect Using LTC1320
for DTE and LTC1335 for DCE Transceivers
LTC1335
24
5V
23
22
R_A1
21
DE1
20 _DY1
19
5V
18
5V
17
D_Y2
16
D_Z2
15
R_A2
14
13 _–5V
1321/22/35 F16
15