DS34LV87T Enhanced CMOS Quad Differential Line Driver General Description Features The DS34LV87T is a high speed quad differential CMOS driver that meets the requirements of both TIA/EIA-422-B and ITU-T V.11. The CMOS DS34LV87T features low static ICC of 100 µA max which makes it ideal for battery powered and power conscious applications. The TRI-STATE ® enable, EN, allows the device to be disabled when the device is not in use to minimize power. The dual enable scheme allows for flexibility in turning devices on or off. Protection diodes protect all the driver inputs against electrostatic discharge. The driver and enable inputs (DI and EN) are compatible with LVTTL and LVCMOS devices. Differential outputs have the same VOD (≥2V) guarantee as the 5V version. The outputs have enhanced ESD Protection providing greater than 7 kV tolerance. n Meets TIA/EIA-422-B (RS-422) and ITU-T V.11 recommendation n Interoperable with existing 5V RS-422 networks n Guaranteed VOD of 2V min over operating conditions n Balanced output crossover for low EMI (typical within 40 mV of 50% voltage level) n Low power design (330 µW @ 3.3V static) n ESD ≥ 7 kV on cable I/O pins (HBM) n Industrial temperature range n Guaranteed AC parameter: — Maximum driver skew: 2 ns — Maximum transition time: 10 ns n Pin compatible with DS26C31 n Available in SOIC packaging Connection Diagram Truth Table Dual-In-Line Package Enables Input EN DI DO+ Outputs DO− L X Z Z H H H L H L L H L = Low logic state X = Irrelevant H = High logic state Z = TRI-STATE 01264501 Top View Order Number DS34LV87TM See NS Package Number M16A TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS012645 www.national.com DS34LV87T Enhanced CMOS Quad Differential Line Driver November 2000 DS34LV87T Absolute Maximum Ratings (Note 1) Lead Temperature Range If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Ratings Supply Voltage (VCC) (Soldering, 4 sec.) (HBM, 1.5k, 100 pF) −0.5V to +7V Enable Input Voltage (EN) −0.5V to VCC + 0.5V Driver Input Voltage (DI) −0.5V to VCC + 0.5V Recommended Operating Conditions −0.5V to +7V Supply Voltage (VCC) Maximum Package Power Dissipation @+25˚C M Package Typ Max Units 3.0 3.3 3.6 V −40 25 +85 ˚C 500 ns Temperature Range (TA) 9.8 mW/˚C above +25˚C Storage Temperature Range Min Operating Free Air 1226 mW Derate M Package ≥ 2.5 kV Other Pins Driver Output Voltage (Power Off: DO+, DO−) ≥ 7 kV Driver Outputs ± 20 mA ± 150 mA Clamp Diode Current DC Output Current, per pin +260˚C DS34LV87T Input Rise and Fall Time −65˚C to +150˚C Electrical Characteristics (Notes 2, 3) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol Parameter Conditions Pin VOD1 Output Differential Voltage RL= ∞, (No Load) DO+, VOD2 Output Differential Voltage RL = 100Ω Figure 1 DO− ∆VOD2 Change in Magnitude of Min Typ Max Units 3.3 4.0 V 2 2.6 −400 7 400 mV V 3.2 3.5 V Output Differential Voltage VOD3 Output Differential Voltage RL = 3900Ω (V.11), Figure 1 (Note 7) VOC Common Mode Voltage RL = 100Ω Figure 1 ∆VOC Change in Magnitude of −400 1.5 2 V 6 400 mV ± 0.5 ± 20 µA −70 −150 mA Common Mode Voltage IOZ TRI-STATE Leakage VOUT = VCC or GND Current Drivers Disabled ISC Output Short Circuit Current VOUT = 0V VIN = VCC or GND (Note 4) IOFF Output Leakage Current VCC= 0V, VOUT = 3V 0.03 100 µA VCC = 0V, VOUT = −0.25V −0.08 −100 µA −40 VIH High Level Input Voltage DI, 2.0 VCC V VIL Low Level Input Voltage EN GND 0.8 V IIH High Level Input Current VIN= VCC IIL Low Level Input Current VIN = GND VCL Input Clamp Voltage IIN = −18 mA ICC Power Supply Current No Load, VIN (all) = VCC or GND www.national.com 10 −10 2 VCC µA µA −1.5 V 100 µA Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol tPHLD Parameter Conditions Differential Propagation Delay RL = 100Ω, CL = 50 pF (Figures 2, 3) High to Low tPLHD Differential Propagation Delay Min Typ Max Units 6 10.5 16 ns 6 11 16 ns 0.5 2.0 ns Low to High tSKD Differential Skew |tPHLD–tPLHD| tSK1 Skew, Pin to Pin (same device) 1.0 2.0 ns tSK2 Skew, Part to Part (Note 8) 3.0 5.0 ns tTLH Differential Transition Time 4.2 10 ns 4.7 10 ns Low to High (20% to 80%) tTHL Differential Transition Time High to Low (80% to 20%) tPHZ Disable Time High to Z 12 20 ns tPLZ Disable Time Low to Z 9 20 ns tPZH Enable Time Z to High 22 32 ns tPZL Enable Time Z to Low 22 32 fMAX Maximum Operating Frequency 32 (Figures 4, 5 ) ns MHz (Note 9) Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation. Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except differential voltages VOD1, VOD2, VOD3. Note 3: All typical values are given for VCC= 3.3V and TA = +25˚C. Note 4: Only one output shorted at a time. The output (true or complement) is configured High. Note 5: f = 1 MHz, tr and tf ≤ 6 ns (10% to 90%). Note 6: See TIA/EIA-422-B specifications for exact test conditions. Note 7: This specification limit is for compliance with TIA/EIA-422-B and ITU-T V.11. Note 8: Devices are at the same VCC and within 5˚C within the operating temperature range. Note 9: All channels switching, output duty cycle criteria is 40%/60% measured at 50%. This parameter is guaranteed by design and characterization. Parameter Measurement Information 01264502 FIGURE 1. Differential Driver DC Test Circuit 3 www.national.com DS34LV87T Switching Characteristics (Notes 5, 6) DS34LV87T Parameter Measurement Information (Continued) 01264503 FIGURE 2. Differential Driver Propagation Delay and Transition Time Test Circuit 01264504 FIGURE 3. Differential Driver Propagation Delay and Transition Time Waveforms Note 10: Generator waveform for all tests unless otherwise specified: f = 1 MHz, Duty Cycle = 50%, Zo = 50Ω, tr ≤ 10 ns, tf ≤ 10 ns. Note 11: CL includes probe and fixture capacitance. 01264505 FIGURE 4. Driver Single-Ended TRI-STATE Test Circuit www.national.com 4 DS34LV87T Parameter Measurement Information (Continued) 01264506 FIGURE 5. Driver Single-Ended TRI-STATE Waveforms Power Decoupling Recommendations: Bypass caps must be used on power pins. High frequency ceramic (surface mount is recommended) 0.1 µF in parallel with 0.01 µF at the power supply pin. A 10 µF or greater tantalum or electrolytic should be connected at the power entry point on the printed circuit board. Typical Application Information General application guidelines and hints for differential drivers and receivers may be found in the following application notes: AN-214, AN-457, AN-805, AN-847, AN-903, AN-912, AN-916. 01264507 RT is optional although highly recommended to reduce reflection 01264508 FIGURE 6. Typical Driver Connection 5 www.national.com DS34LV87T Typical Application Information (Continued) 01264509 FIGURE 7. Typical Driver Output Waveforms www.national.com 6 DS34LV87T Enhanced CMOS Quad Differential Line Driver Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Molded Small Outline Package (M) Order Number DS34LV87TM NS Package Number M16A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. 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