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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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LTC1335CS Arkusz danych(PDF) 14 Page - Linear Technology |
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LTC1335CS Arkusz danych(HTML) 14 Page - Linear Technology |
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14 / 20 page  14 LTC1321/LTC1322/LTC1335 1 24 VCC 5V 1321/22/35 F13 120 Ω 11 19 LTC1321 LTC1322 LTC1335 RX OUT 16 5V 10 9 8 7 6 12 15 14 RS485 I/O EIA562 DR OUT 17 5V 18 13 VEE –5V 5V 0V 3 22 RX OUT 4 EIA562 RX IN (LTC1322/LTC1335 ONLY) 21 2 RX OUT 5 DR IN DR ENABLE DR IN DR IN 20 EIA562 DR OUT (LTC1322/LTC1335 ONLY) LTC1321/LTC1322 ONLY EIA562 RX IN VDD (LTC1321/LTC1322) OR OE (LTC1335) 0.1 µF 0.1 µF 1 24 VCC 5V V– –12V V+ 12V 1321/22/35 F14 120 Ω 0.1 µF 0.1 µF 0.1 µF 11 19 LTC1321 LTC1322 RX OUT 16 5V 10 9 8 7 6 12 15 14 RS485 I/O *OPTIONAL RS232 DR OUT 17 5V Z3* 1N5246B 16V 18 13 VEE 5V 0V 3 22 RX OUT 4 RS232 RX IN (LTC1322 ONLY) 21 2 RX OUT 5 DR IN DR ENABLE DR IN DR IN 20 RS232 DR OUT (LTC1322 ONLY) RS232 RX IN VDD Z1 1N5229B 4.3V Z2 1N5229B 4.3V Figure 13. EIA562/RS485 Interfaces with ±5V Supplies Figure 14. RS232/RS485 Interfaces with 5V, ±12V Supplies LocalTalk and AppleTalk are registered trademarks of Apple Computer, Inc. LB pin has a LOW logic state. The driver outputs are not isolated from the external loads. This allows transmitter verification under the loaded condition. An internal 4 µA current source pulls the LB pin HIGH if left open and disables the loopback configuration. EIA562/RS485 Applications EIA562 and RS485 output levels are supported when LTC1321/LTC1322/LTC1335 are powered from ±5V sup- plies. The LTC1321/LTC1322 require the VDD and VCC pins to be tied together and connected to 5V supply (Figure 13). The VDD and VCC are connected internally and brought out at VCC pin in the LTC1335. The unloaded outputs will swing from – 5V to 5V in EIA562 mode, and from 0V to 5V in RS485 mode. RS232/RS485 Applications If true RS232-compatible outputs are required, the LTC1321/LTC1322 may be used with the VDD and VEE supply voltages increased to provide the additional signal swing. To meet RS232, VDD must be between 6.5V and 10V, and VEE must be between –6.5V and –10V. VCC remains connected to 5V. If only ±12V supplies are avail- able, inexpensive Zener diodes (Z1 and Z2) may be con- nected in series with VDD and VEE supply pins as shown in Figure 14. An optional 16V Zener diode between VCC and VEE is recommended to keep the maximum voltage be- tween VCC and VEE within safe limits. LocalTalk ®/AppleTalk® Applications The LTC1321/LTC1322/LTC1335 can be used to provide AppleTalk/LocalTalk-compatible signals in RS485 mode. Figure 15 shows one half of an LTC1335 connected to an LTC1320 AppleTalk transceiver in a typical LocalTalk configuration. Figure 16 shows a typical direct-wire con- nection with the LTC1335 as the DCE transceiver and the LTC1320 as the DTE transceiver. The LTC1321/LTC1322/ LTC1335 RS485 mode is capable of meeting all AppleTalk protocol specifications. S APPLICATI I FOR ATIO |
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