LTC1482 Linear Technology, LTC1482 Datasheet
LTC1482
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LTC1482 Summary of contents
Page 1
... A when the driver is disabled and enabled respectively. In shutdown, the quiescent current of the LTC1482 drops to a maximum When the driver is disabled or the LTC1482 is in shut- down, the driver outputs are three-stated and remain in a high impedance state over the RS485 common mode range ...
Page 2
... Input Current (A, B) with Driver Disabled IN2 V Differential Input Threshold Voltage for Receiver THRO 2 U RATINGS Junction Temperature .......................................... 125 C + 0.3V) Operating Temperature Range CC LTC1482C ........................................ 0.3V) LTC1482I ...................................... – Storage Temperature Range .................. – 150 C Lead Temperature (Soldering, 10 sec)................... 300 C + 0.3V ORDER PART NUMBER RO 1 LTC1482CMS8 CD ...
Page 3
... L1 L2 (Figures 100pF, DIFF L1 L2 (Figures 100pF, DIFF L1 L2 (Figures 4, 10) DI/SHDN = 100pF, DIFF L1 L2 (Figures 4, 10) DI/SHDN = V LTC1482 MIN TYP MAX – 0.20 0.20 30 3.4 3.5 0 580 900 CC 430 700 250 35 250 7 85 ...
Page 4
... LTC1482 U SWITCHING CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER t Receiver Input to CD Output High at Shutdown CDH(SHDN) t Receiver Input to CD Output Low from Shutdown CDL(SHDN) t Receiver Enable from Shutdown to Output High ZH(SHDN) t Receiver Enable from Shutdown to Output Low ZL(SHDN) t Receiver Disable from High on Shutdown ...
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... Voltage vs Output Current 5 4.75V CC 4 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 –35 –30 –25 –20 –15 –10 –5 0 OUTPUT CURRENT ( A) 1482 G11 LTC1482 Receiver Input Threshold Voltage vs Supply Voltage –0.02 –0.04 –0.06 V THRO(HIGH) –0.08 –0.10 V –0.12 THRO(LOW) –0.14 –0.16 –0.18 –0.20 4.5 4.75 5 5.25 5.5 SUPPLY VOLTAGE (V) 1482 G06 ...
Page 6
... LTC1482 W U TYPICAL PERFOR A CE CHARACTERISTICS Receiver Output High Voltage vs Temperature 4 4.75V CC 4 8mA 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 –55 –35 – 105 125 TEMPERATURE ( C) 1482 G13 Receiver Propagation Delay vs Temperature 200 180 160 t PLH 140 120 t PHL 100 –55 –35 –15 ...
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... 12V 4. OD3 1.0 DI/SD HIGH SEE FIGURE 2 0.5 V FOR V = 4.5V TO 5.25V OD3 CC 0 –0.5 –55 –35 – 105 125 TEMPERATURE ( C) 1482 G29 LTC1482 Driver Differential Output Voltage vs Temperature 3 100 L 3.0 2 5.25V 2 4.75V 4.5V CC 1.5 1.0 0 4.5V TO 5.25V OD ...
Page 8
... A weak internal pull-up removes the need for an external pull-up resistor if fast rise times and low if are not important. Several LTC1482s can share the same THRO(MAX) CD line forces RO to the high fail-safe state. In shutdown three-stated. This pin can be pulled above V but should not be taken above 8V to avoid damage ...
Page 9
... TO 12V 375 1482 F02 B Figure 2. Driver DC Test Load # UNDER TEST 15pF 1482 F04 LTC1482 < 5.25V – (Note (Internal Pull-Up) V < (A – B) < THCD(MIN) THCD(MAX) A and B are Open 1 A and B are Shorted ...
Page 10
... LTC1482 U W SWITCHI WAVEFOR S 3V DI/SHDN 1. PLH t DSKEW V O 90% 10% 50% – 1/2 V SKEW O NOTE 1. 2. 2.3V 0V NOTE FOR t ZL(SHDN) V OD2 A – – V OD2 NOTE – ...
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... A – – V OD2 NOTE: 1k PULL- 1. OD2 A – B – V OD2 NOTE: 1k PULL- INPUT t CDL 1.5V Figure 10. Carrier Detect Timing 1.5V t CDH(SHDN) 1.5V THREE-STATE Figure 11. Shutdown Carrier Detect Timing LTC1482 t CDH 1.5V 1482 F10 t CDL(SHDN) 1.5V 1482 F11 11 ...
Page 12
... I Shutdown Mode CC The supply current of the LTC1482 is reduced max by taking both the DE and DI/SHDN pins low. In shutdown, all internal circuits are powered down and the driver and receiver outputs are three-stated. The CD output is taken high by the weak internal pull-up ...
Page 13
... LTC1482. ESD Protection The ESD performance of the LTC1482 A and B pins is characterized to meet 15kV using the Human Body Model (100pF, 1.5k ), IEC-1000-4-2 Level 4 ( 8kV) contact mode and IEC-1000-4-2 Level 3 ( 8kV) air dis- charge mode ...
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... LTC1482 PACKAGE DESCRIPTION 0.007 0 – 6 TYP (0.18) 0.021 0.006 (0.53 0.015) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 0.300 – ...
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... TYP 0.014 – 0.019 (0.355 – 0.483) TYP LTC1482 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) 0.050 (1 ...
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... Differential Driver and Receiver Pair with Fail-Safe Receiver Output LT1785 60V Fault Protected RS485 Transceiver Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com Fail-Safe “0” Application (Idle State = Logic “0”) 5V LTC1482 ...