特長 概要 LT1785/LT1785/ 60V フォールト保護付き RS485/RS422 トランシーバ 60V LTC485 および LTC491 とピン互換 高入力インピーダンスにより最大 128 ノードをサポート ESD による損傷またはラッチアップがない IEC-1000-4-2 レベル 4: ±15kV 空中放電 IEC-1000-4-2 レベル 2: ±4kV 接触放電 スルーレート制御による EMI 放射の抑制 入力がフロート 短絡 非アクティブの場合に レシーバ出力の H 状態を保証 オフ時 / パワーダウン時は出力がハイ インピーダンス 低コスト 低インピーダンスのケーブルをドライブ 全出力に短絡保護回路を内蔵 サーマル シャットダウン保護 125 C までの動作を保証 アプリケーション 産業用制御データ ネットワーク CN バス アプリケーション HVC 制御 LT LTC および LTM はリニアテクノロジー社の登録商標です 他のすべての商標はそれぞれの所有者に所有権があります LT 1785/LT1791 RS485 RS422 60V 128 250k EMI 72Ω LT1785/LT1791 H ESD LT1785/LT1785 8 P SO 14 P SO 標準的応用例 250k 1 RX V CC1 1 1 LT1785 R TERM 1 TX GND1 Y-Z 2 RX V CC2 2 2 LT1785 R TERM 178591 T02 2 TX GND2 178591 T01 1
絶対最大定格 (Note 1) 電源電圧 (V CC )... 18V レシーバ イネーブル入力電圧... 0.3V~6V ドライバ イネーブル入力電圧... 0.3V~6V ドライバ入力電圧... 0.3V~18V レシーバ入力電圧... 60V~60V ドライバ出力電圧... 60V~60V レシーバ出力電圧... 0.3V~(V CC +6V) 動作温度範囲 LT1785C/LT1791C/ LT1785C/LT1791C...0 ~70 LT1785I/LT1791I/ LT1785I/LT1791I... 40 ~85 LT1785H/LT1791H/ LT1785H/LT1791H... 40 ~125 保存温度範囲... 65 ~150 リード温度 ( 半田付け 10 秒 )... 300 ピン配置 TOP VIEW 1 2 3 4 N8 PCKGE 8-LED PP TOP VIEW D R 8 V CC 7 6 5 GND S8 PCKGE 8-LED PLSTIC SO T JMX = 150 C, θ J = 130 C/W (N8) T JMX = 150 C, θ J = 150 C/W (S8) NC 1 2 3 4 5 GND 6 GND 7 N PCKGE 14-LED PP D R 14 V CC 13 NC 12 11 10 Z 9 Y 8 NC S PCKGE 14-LED PLSTIC SO T JMX = 150 C, θ J = 130 C/W (N) T JMX = 150 C, θ J = 150 C/W (S) 発注情報 * LT1785CN8#PF LT1785CN8#TRPF 1785 8-Lead PP 0 C to 70 C LT1785CS8#PF LT1785CS8#TRPF 1785 8-Lead Pastic SO 0 C to 70 C LT1785IN8#PF LT1785IN8#TRPF 1785I 8-Lead PP 40 C to 85 C LT1785IS8#PF LT1785IS8#TRPF 1785I 8-Lead Pastic SO 40 C to 85 C LT1785CN8#PF LT1785CN8#TRPF 1785 8-Lead PP 0 C to 70 C LT1785CS8#PF LT1785CS8#TRPF 1785 8-Lead Pastic SO 0 C to 70 C LT1785IN8#PF LT1785IN8#TRPF 1785I 8-Lead PP 40 C to 85 C LT1785IS8#PF LT1785IS8#TRPF 1785I 8-Lead Pastic SO 40 C to 85 C LT1785HN8#PF LT1785HN8#TRPF 1785H 8-Lead PP 40 C to 125 C LT1785HS8#PF LT1785HS8#TRPF 1785H 8-Lead Pastic SO 40 C to 125 C LT1785HN8#PF LT1785HN8#TRPF 1785H 8-Lead PP 40 C to 125 C LT1785HS8#PF LT1785HS8#TRPF 1785H 8-Lead Pastic SO 40 C to 125 C LT1791CN#PF LT1791CN#TRPF 1791 14-Lead PP 0 C to 70 C LT1791CS#PF LT1791CS#TRPF 1791 14-Lead Pastic SO 0 C to 70 C 2
発注情報 * LT1791IN#PF LT1791IN#TRPF 1791I 14-Lead PP 40 C to 85 C LT1791IS#PF LT1791IS#TRPF 1791I 14-Lead Pastic SO 40 C to 85 C LT1791CN#PF LT1791CN#TRPF 1791 14-Lead PP 0 C to 70 C LT1791CS#PF LT1791CS#TRPF 1791 14-Lead Pastic SO 0 C to 70 C LT1791IN#PF LT1791IN#TRPF 1791I 14-Lead PP 40 C to 85 C LT1791IS#PF LT1791IS#TRPF 1791I 14-Lead Pastic SO 40 C to 85 C LT1791HN#PF LT1791HN#TRPF 1791H 14-Lead PP 40 C to 125 C LT1791HS#PF LT1791HS#TRPF 1791H 14-Lead Pastic SO 40 C to 125 C LT1791HN#PF LT1791HN#TRPF 1791H 14-Lead PP 40 C to 125 C LT1791HS#PF LT1791HS#TRPF 1791H 14-Lead Pastic SO 40 C to 125 C * LT1785CN8 LT1785CN8#TR 1785 8-Lead PP 0 C to 70 C LT1785CS8 LT1785CS8#TR 1785 8-Lead Pastic SO 0 C to 70 C LT1785IN8 LT1785IN8#TR 1785I 8-Lead PP 40 C to 85 C LT1785IS8 LT1785IS8#TR 1785I 8-Lead Pastic SO 40 C to 85 C LT1785CN8 LT1785CN8#TR 1785 8-Lead PP 0 C to 70 C LT1785CS8 LT1785CS8#TR 1785 8-Lead Pastic SO 0 C to 70 C LT1785IN8 LT1785IN8#TR 1785I 8-Lead PP 40 C to 85 C LT1785IS8 LT1785IS8#TR 1785I 8-Lead Pastic SO 40 C to 85 C LT1785HN8 LT1785HN8#TR 1785H 8-Lead PP 40 C to 125 C LT1785HS8 LT1785HS8#TR 1785H 8-Lead Pastic SO 40 C to 125 C LT1785HN8 LT1785HN8#TR 1785H 8-Lead PP 40 C to 125 C LT1785HS8 LT1785HS8#TR 1785H 8-Lead Pastic SO 40 C to 125 C LT1791CN LT1791CN#TR 1791 14-Lead PP 0 C to 70 C LT1791CS LT1791CS#TR 1791 14-Lead Pastic SO 0 C to 70 C LT1791IN LT1791IN#TR 1791I 14-Lead PP 40 C to 85 C LT1791IS LT1791IS#TR 1791I 14-Lead Pastic SO 40 C to 85 C LT1791CN LT1791CN#TR 1791 14-Lead PP 0 C to 70 C LT1791CS LT1791CS#TR 1791 14-Lead Pastic SO 0 C to 70 C LT1791IN LT1791IN#TR 1791I 14-Lead PP 40 C to 85 C LT1791IS LT1791IS#TR 1791I 14-Lead Pastic SO 40 C to 85 C LT1791HN LT1791HN#TR 1791H 14-Lead PP 40 C to 125 C LT1791HS LT1791HS#TR 1791H 14-Lead Pastic SO 40 C to 125 C LT1791HN LT1791HN#TR 1791H 14-Lead PP 40 C to 125 C LT1791HS LT1791HS#TR 1791H 14-Lead Pastic SO 40 C to 125 C さらに広い動作温度範囲で規定されるデバイスについては 弊社または弊社代理店にお問い合わせください * 温度グレードは出荷時のコンテナのラベルで識別されます 鉛フリー仕様の製品マーキングの詳細については http://www.inear-tech.co.jp/eadfree/ をご覧ください この製品の梱包はトレータイプのみです 詳細については http://www.inear-tech.co.jp/packaging/ をご覧ください 3
DC 電気的特性 T = 25 V CC = 5V SYMOL PRMETER CONTIONS MIN TYP MX UNITS V OD1 Differentia Driver Output Votage (Unoaded) I O = 0 4.1 5 V V OD2 Differentia Driver Output Votage (With Load) R = 50Ω (RS422), Figure 1 R = 27Ω (RS485), Figure 1 R = 18Ω V OD Change in Magnitude of Driver Differentia Output Votage for Compementary Output States 2.0 1.5 1.2 2.70 2.45 2.2 R = 27Ω or R = 50Ω, Figure 1 0.2 V V OC Driver Common Mode Output Votage R = 27Ω or R = 50Ω, Figure 1 2 2.5 3 V V OC Change in Magnitude of Driver Common Mode Output R = 27Ω or R = 50Ω, Figure 1 0.2 V Votage for Compementary Output States V IH Input High Votage,, 2 V V IL Input Low Votage,, 0.8 V I IN1 Input Current,, 5 µ I IN2 Input Current (, ); (LT1791 or LT1785 with = 0V) V IN = 12V 0.15 0.3 m V IN = 7V 0.15 0.08 m 60V V IN 60V 6 6 m V TH Differentia Input Threshod Votage for Receiver LT1785/LT1791: 7V V CM 12V LT1785/LT1791: 7V V CM 12V V TH Receiver Input Hysteresis 7V < V CM < 12V 20 mv V OH Receiver Output High Votage I O = 400µ, V ID = 200mV 3.5 4 V V OL Receiver Output Low Votage I O = 1.6m, V ID = 200mV 0.3 0.5 V Three-State (High Impedance) Output Current at Receiver 0V < V OUT < 6V > 2V or Power Off 1 1 µ R IN Receiver Input Resistance (LT1791) 7V V CM 12V 60V V CM 60V 0.2 0.2 85 125 125 LT1785 7V V CM 12V 50 90 kω RS485 Unit Load 0.25 I SC Driver Short-Circuit Current V OUT = HIGH, Force V O = 7V V OUT = LOW, Force V O = 12V Driver Output Faut Current V O = 60V V O = 60V 35 35 6 0.2 0 250 250 V V V V V kω kω m m 6 m m Receiver Short-Circuit Current 0V V O V CC ±35 m Driver Three-State Output Current 7V V O 12V 0.2 0.3 m 60V V O 60V 6 6 m I CC Suppy Current No Load, = 0V, = 5V No Load, = 5V, = 5V No Load, = 0V, = 0V No Load, = 5V, = 0V 5.5 5.5 4.5 0.2 9 9 8 0.3 m m m m 4
スイッチング特性 T = 25 V CC = 5V SYMOL PRMETER CONTIONS MIN TYP MX UNITS t PLH Driver Input to Output Figures 3, 5 700 2000 ns t PHL Driver Input to Output Figures 3, 5 700 2000 ns t SKEW Driver Output to Output Figures 3, 5 100 ns t r, t f Driver Rise or Fa Time Figures 3, 5 200 800 2000 ns t ZH Driver Enabe to Output High Figures 4, 6 500 3000 ns t ZL Driver Enabe to Output Low Figures 4, 6 800 3000 ns t LZ Driver Disabe Time from Low Figures 4, 6 200 5000 ns t HZ Driver Disabe Time from High Figures 4, 6 800 5000 ns t PLH Receiver Input to Output Figures 3, 7 400 900 ns t PHL Receiver Input to Output Figures 3, 7 400 900 ns t SKD Differentia Receiver Skew 200 ns t ZL Receiver Enabe to Output Low Figures 2, 8 300 1000 ns t ZH Receiver Enabe to Output High Figures 2, 8 300 1000 ns t LZ Receiver Disabe from Low Figures 2, 8 400 1000 ns t HZ Receiver Disabe from High Figures 2, 8 400 1000 ns f MX Maximum Data Rate 250 kbps t SHDN Time to Shut Down Figures 2, 6, 8 3 µs t ZH(SHDN) Driver Enabe from Shutdown to Output High Figures 2, 6; = 5V 12 µs t ZL(SHDN) Driver Enabe from Shutdown to Output Low Figures 2, 6; = 5V 12 µs t ZH(SHDN) Receiver Enabe from Shutdown to Output High Figures 2, 8; = 0V 4 µs t ZL(SHDN) Receiver Enabe from Shutdown to Output Low Figures 2, 8; = 0V 4 µs Note 1 絶対最大定格に記載された値を超えるストレスはデバイスに永続的損傷を与える可能性がある また 絶対最大定格状態が長時間続くと デバイスの信頼性と寿命に悪影響を与える恐れがある 5
標準的性能特性 OUTPUT VOLTGE (V) 4 T = 25 C 3 2 1 FFENTIL VOLTGE (V) 3.0 2.5 2.0 1.5 1.0 0.5 LY (ns) 1000 800 t PHL 600 t PLH 400 200 0 10 100 1k LOD SISTNCE (Ω) R = 27Ω 0 40 20 0 20 40 60 80 100 TEMPERTU ( C) 0 40 20 0 20 40 60 80 100 TEMPERTU ( C) 178591 G01 178591 G02 178591 G03 PPGTION LY (ns) LT1791 ( = 0V) LT1791 V IN 1000 900 800 700 LH 600 HL 500 400 300 200 100 0 40 20 0 20 40 60 80 100 TEMPERTU ( C) 178591 G04 1m/V 200µ/V 60V V IN 60V 60V V IN 60V 178591 G05 178591 G06 LT1785 ( = = 0V) 7 700 6 5 DRIVER ND CEIVER ON 600 500 HL V CM = 12V HL V CM = 7V 1m/V I CC (m) 4 3 CEIVER ONLY LY (ns) 400 300 LH V CM = 12V LH V CM = 7V 2 200 60V V, V 60V 178591 G07 1 STNDY 0 40 20 0 20 40 60 80 100 TEMPERTU ( C) 100 0 0 1 2 3 4 5 V IN FFENTIL (V) 178591 G08 178591 G09 6
ピン機能 TTL ( L ) 200mV H 200mV L H 6V TTL L H 3μs CN L TTL H (LT1791 Y Z LT1785 ) L 3μs CN ( ) ( ) TTL H Y H Z L L CN L GND Y Y LT1785 Y L 60V CN Y CNL Z Z LT1785 Z L 60V CN Z CNH V() [V() 200mV] H V() [V() 200mV] L 60V 1 RS485 128 LT1785 LT1791 LT1785/LT1791 200mV < V TH < 0 0V H V() [V() 200mV] H V() [V() 200mV] L 60V 1 RS485 128 LT1785 LT1791 LT1785/LT1791 200mV < V TH < 0 0V H V CC RS422 RS485 4.75V V CC 5.25V V CC V CC 0.1μF ESR 8 (V CC ) 7
テスト回路 V OD R R V OC 1785/91 F01 CEIVER OUTPUT TEST POINT C RL 1k S1 S2 1k V CC 1785/91 F02 1. DC 2. 5V R FF C L1 C L2 15pF OUTPUT UNR TEST 500Ω C L S1 S2 V CC 1785/91 F04 1785/91 F03 3. / 4. 機能表 LT1785 INPUTS OUTPUTS 0 1 0 0 1 0 0 1 1 1 0 1 1 0 X Hi-Z Hi-Z Hi-Z 1 1 0 0 1 Hi-Z 1 1 1 1 0 Hi-Z LT1785 INPUTS OUTPUT - 0 0 X 200mV 0 0 0 X 200mV* 1 0 0 X Open 1 1 0 X X Hi-Z * LT1785の場合 0mV LT1791 INPUTS OUTPUTS - Y Z 0 0 X 200mV Hi-Z Hi-Z 0 0 0 X 200mV* Hi-Z Hi-Z 1 0 0 X Open Hi-Z Hi-Z 1 0 1 0 200mV 0 1 0 0 1 0 200mV* 0 1 1 0 1 0 Open 0 1 1 0 1 1 200mV 1 0 0 0 1 1 200mV* 1 0 1 0 1 1 Open 1 0 1 1 0 X X Hi-Z Hi-Z Hi-Z 1 1 0 X 0 1 Hi-Z 1 1 1 X 1 0 Hi-Z * LT1791の場合 0mV 8
スイッチング時間波形 5V 0V f = 125kHz, t r 10ns, t f 10ns t PLH t PHL 1/2 V O V O 0V V O V O 1/2 VO 10% t r t SKEW 90% V FF = V() V() t f t SKEW 90% 10% 1785/91 F05 5. 5V 0V f = 125kHz, t r 10ns, t f 10ns 5V, V OL t ZL(SHDN), t ZL 2.3V OUTPUT NORMLLY LOW t LZ 0.5V V OH, 0V 2.3V t ZH(SHDN), t ZH OUTPUT NORMLLY HIGH t HZ 0.5V 178591 F06 6. V OH OUTPUT V OL t PHL f = 125kHz, t r 10ns, t f 10ns t PLH V OD2 0V INPUT 0V V OD2 178591 F07 7. 5V 0V f = 125kHz, t r 10ns, t f 10ns 5V t ZL(SHDN), t ZL OUTPUT NORMLLY LOW t LZ 0.5V 0V t ZH(SHDN), t ZH OUTPUT NORMLLY HIGH t HZ 0.5V 178591 F08 8. 9
10 アプリケーション情報 LT1785/LT1791 RS485/RS422 RS485 7V 12V CMOS RS485 8V 12.5V LT1785 LT1791 RS485 CMOS RS485 RS485 7V 12V LT1785/LT1791 60V 120VC 11 LT1785/LT1791 IC ESD LT1785/LT1791 I/O ESD LT1785 LT1791 Y Z IEC- 1000-4-2 2 15kV 4kV ESD LT1791 IEC-1000-4-2 2 15kV 4kV ESD ESD LT1791 ESD 2.2k IEC 4 LT1785/LT1791 L H H L 1 CN 3μs - 12μs CN 250k L
11 アプリケーション情報 EMI LT1785/LT1791 EMI 250k PVC 72Ω LT1785/LT1791 72Ω 9. RS422 5 4 3 2 Z Y 12 11 10 9 178591 F09 TX 120Ω 5 4 3 2 Y Z 9 10 11 12 LT1791 LT1791 RX TX 120Ω RX
パッケージ N8 8 PP ( 0.300 ) (LTC DWG # 05-08-1510).400* (10.160) MX 8 7 6 5.255 ±.015* (6.477 ± 0.381) 1 2 3 4.300.325 (7.620 8.255).045.065 (1.143 1.651).130 ±.005 (3.302 ± 0.127).008.015 (0.203 0.381).325 +.035.015 +0.889 8.255 0.381 ( ).065 (1.651) TYP NOTE 1. * 0.010 (0.254mm).100 (2.54) SC.120 (3.048) MIN.018 ±.003 (0.457 ± 0.076).020 (0.508) MIN N8 1002 12
パッケージ S8 8 ( 0.150 ) (LTC DWG # 05-08-1610).050 SC.045 ±.005.189.197 (4.801 5.004) NOTE 3 8 7 6 5.245 MIN.160 ±.005.228.244 (5.791 6.197).150.157 (3.810 3.988) NOTE 3.030 ±.005 TYP 1 2 3 4.008.010 (0.203 0.254).010.020 (0.254 0.508) 45 0 8 TYP.053.069 (1.346 1.752).004.010 (0.101 0.254) NOTE 1..016.050 (0.406 1.270) 2. 3. 0.006 (0.15mm).014.019 (0.355 0.483) TYP.050 (1.270) SC SO8 0303 13
パッケージ N 14 PP ( 0.300 ) (LTC DWG # 05-08-1510).770* (19.558) MX 14 13 12 11 10 9 8.255 ±.015* (6.477 ± 0.381) 1 2 3 4 5 6 7.300.325 (7.620 8.255).130 ±.005 (3.302 ± 0.127).045.065 (1.143 1.651).008.015 (0.203 0.381).325 +.035.015 +0.889 8.255 0.381 ( ).020 (0.508) MIN.120 (3.048) MIN NOTE 1. * 0.010 (0.254mm).005 (0.127) MIN.100 (2.54) SC.065 (1.651) TYP.018 ±.003 (0.457 ± 0.076) N14 1103 14
パッケージ S 14 ( 0.150 ) (LTC DWG # 05-08-1610).050 SC.045 ±.005.337.344 (8.560 8.738) NOTE 3 N 14 13 12 11 10 9 8.245 MIN 1 2 3 N/2.160 ±.005.228.244 (5.791 6.197) N N/2.150.157 (3.810 3.988) NOTE 3.030 ±.005 TYP 1 2 3 4 5 6 7.008.010 (0.203 0.254).010.020 (0.254 0.508) 45 0 8 TYP.053.069 (1.346 1.752).004.010 (0.101 0.254).016.050 (0.406 1.270) NOTE 1. 2. 3. 0.006 (0.15mm).014.019 (0.355 0.483) TYP.050 (1.270) SC S14 0502 15
標準的応用例 1 2 3 RX LT1785 7 6 R T 120Ω R T 120Ω 7 6 RX LT1785 1 2 3 4 TX 6 7 6 7 TX 4 LT1785 LT1785 178591 F10 4 3 2 1 4 3 2 1 10. RS485 1 2 3 4 RX LT1785 TX 8 7 6 5 V CC RYCHEM POLYSWITCH TR600-150 2 47Ω 47Ω CRON COMPOSITE 5W 0.1µF 300V R T,120Ω 178591 F11 1.5KE36C 11. 120V C RS485 関連製品 LTC485 RS485 I CC = 300μ ( ) LTC491 I CC = 300μ LTC1483 RS485 EMI LTC1485 10M LTC1487 EMI RS485 256 LTC1520 50Mbps 400ps ( ) LTC1535 RS485 2500V RMS LTC1685 52Mbps RS485 500ps ( ) LTC1687 52Mbps RS485 500ps ( ) 16 102-0094 東京都千代田区紀尾井町 3-6 紀尾井町パークビル 8F TEL 03-5226-7291 FX 03-5226-0268 www.inear-tech.co.jp LT 0409 V C PRINTED IN JPN LINER TECHNOLOGY CORPORTION 1998