LTC2854 LINER [Linear Technology], LTC2854 Datasheet
LTC2854
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LTC2854 Summary of contents
Page 1
... Excessive power dissipation caused by bus contention or a fault is prevented by current limiting all outputs and by a thermal shutdown. Enhanced ESD protection allows the LTC2854 to withstand ±25kV (human body model) and the LTC2855 to withstand ±15kV on the transceiver interface pins without latchup or damage ...
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... For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: 2 (Note 1) Operating Temperature (Note 4) LTC2854C, LTC2855C .............................. 0°C to 70°C LTC2854I, LTC2855I ............................ –40°C to 85°C –15V) to +15V LTC2854H, LTC2855H ........................ –40°C to 125°C CC Storage Temperature Range ................... –65°C to 150°C +0.3V) ...
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... RO ≤ ≤ RO ≤ 2V –7V, 0V, 10V (Figure 3. 0V, ⎯ R ⎯ (LTC2854C/LTC2854I, LTC2855C/LTC2855I) (LTC2854H, LTC2855H 0V, ⎯ R ⎯ 0V LTC2854/LTC2855 MIN TYP MAX UNITS ● ● 1 ● ● 0.2 ● ...
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... R ⎯ ⎯ R ⎯ 0V LTC2854, Human Body Model LTC2855, Human Body Model The denotes the specifi cations which apply over the full operating ● = 25° 3.3V unless otherwise noted (Note 2 ...
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... Figure 4. Driver Timing Measurement GND GND 285455 F05a LTC2854/LTC2855 Y I OSD DRIVER Z + – 285455 F01-2 Figure 2. Driver Output Short-Circuit Current t t PLHD PHLD t SKEWD V 1 90% 90 10% 10 1/2 V ...
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... LTC2854/LTC2855 TEST CIRCUITS A ± RECEIVER CM B ± RECEIVER Figure 7. Receiver Enable and Disable Timing Measurements A RO RECEIVER TE B Figure 8. Termination Resistance and Timing Measurements A-B – 285455 F06a 0 Figure 6 ...
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... OUTPUT CURRENT (mA) Receiver Propagation Delay vs Temperature 1. 15pF –40 – TEMPERATURE (˚C) LTC2854/LTC2855 T = 25° 3.3V, unless otherwise noted Driver Propagation Delay vs Temperature 54Ω DIFF C = 100pF 120 –40 –20 0 ...
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... Y (Pins NA/8/12): Positive Driver Output for LTC2855. Z (Pins NA/9/13): Negative Driver Output for LTC2855. B (Pins 9/10/14): Negative Receiver Input (and Negative Driver Output for LTC2854). A (Pins 8/11/15): Positive Receiver Input (and Positive Driver Output for LTC2854). V (Pins 10/12/16): Positive Supply 3.6V. Bypass with 0.1μF ceramic capacitor. ...
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... SHUTDOWN R IN TERM ONLY R TERM TERM AND TERM TRANSMIT TERM A 25kV RE 120Ω TERM 25kV DI LTC2854/LTC2855 RO TERMINATOR DRIVEN OFF DRIVEN ON HIGH-Z OFF HIGH-Z ON DRIVEN OFF DRIVEN ON HIGH-Z OFF HIGH TERMINATOR HIGH-Z DRIVEN OFF HIGH-Z DRIVEN ON ...
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... CC part. The equivalent input resistance looking into A and B is shown in Figure 9. The termination resistor cannot be enabled the device is unpowered or in thermal shutdown mode. Figure 9. Equivalent Input Resistance into A and B (on the LTC2854, Valid if Driver is Disabled) CC >96kΩ A 60Ω TE 60Ω ...
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... If the cable is not terminated with its char- acteristic impedance, refl ections will result in distorted waveforms. The LTC2854/LTC2855 are the fi rst 3.3V RS485/RS422 transceivers to offer integrated switchable termination resistors on the receiver input pins. This provides the advantage of being able to easily change, through logic control, the line termination for optimal performance when confi ...
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... LTC2855, DI and A/B should not be routed near the driver or receiver outputs. The logic inputs of the LTC2854/LTC2855 have 150mV of hysteresis to provide noise immunity. Fast edges on the outputs can cause glitches in the ground and power supplies which are exacerbated by capacitive loading logic input is held near its threshold (typically 1 ...
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... Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699) 0.675 ±0.05 PIN 1 PACKAGE TOP MARK OUTLINE (SEE NOTE 6) 0.200 REF LTC2854/LTC2855 B "A" A "B" 285455 TA03 R = 0.115 TYP 6 3.00 ±0.10 1.65 ± 0.10 (4 SIDES) (2 SIDES) 5 0.75 ±0.05 2.38 ±0.10 (2 SIDES) 0.00 – ...
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... LTC2854/LTC2855 PACKAGE DESCRIPTION 3.60 ±0.05 1.70 ±0.05 2.20 ±0.05 (2 SIDES) 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (NOTE 6) 0.200 REF NOTE: 1. DRAWING PROPOSED VARIATION OF VERSION (WGED) IN JEDEC PACKAGE OUTLINE M0-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH ...
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... DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE INCHES **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD (MILLIMETERS) FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE LTC2854/LTC2855 .189 – .196* (4.801 – 4.978) .009 (0.229 ...
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... LTC2854/LTC2855 TYPICAL APPLICATION Multi-Node Network with End Termination Using the LTC2854 LTC2854 3.3V D RELATED PARTS PART NUMBER DESCRIPTION LTC485 Low Power RS485 Interface Transceiver LTC491 Differential Driver and Receiver Pair LTC1480 3.3V Ultralow Power RS485 Transceiver LTC1483 Ultralow Power RS485 Low EMI Transceiver ...