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 Input Outputs EN Enables DI DO+ DO− L X Z Z H H H L H L L H Dual-In-Line Package L = Low logic state X = Irrelevant H = High logic state Z = TRI-STATE DS012645-1 Top View Order Number DS34LV87TM or DS34LV87TN See NS Package Number M16A or N16A TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS012645 www.national.com DS34LV87T Enhanced CMOS Quad Differential Line Driver January 1997 Absolute Maximum Ratings (Note 1) Lead Temperature Range (Soldering, 4 sec.) ESD Ratings (HBM, 1.5k, 100 pF) Driver Outputs Other Pins If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) −0.5V to +7V Enable Input Voltage (EN) −0.5V to VCC + 0.5V −0.5V to VCC + 0.5V Driver Input Voltage (DI) ± 20 mA Clamp Diode Current ± 150 mA DC Output Current, per pin Driver Output Voltage (Power Off: DO+, DO−) −0.5V to +7V Maximum Package Power Dissipation +25˚C M Package 1226 mW N Package 1736 mW Derate M Package 9.8 mW/˚C above +25˚C Derate N Package 13.89 mW/˚C above +25˚C Storage Temperature Range −65˚C to +150˚C +260˚C ≥ 7 kV ≥ 2.5 kV Recommended Operating Conditions Supply Voltage (VCC) Operating Free Air Temperature Range (TA) DS34LV87T Input Rise and Fall Time Min 3.0 Typ 3.3 Max 3.6 Units V −40 25 +85 500 ˚C ns Electrical Characteristics (Notes 2, 3) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol VOD1 Output Differential Voltage Parameter Conditions RL= ∞, (No Load) DO+, Pin VOD2 Output Differential Voltage RL = 100Ω Figure 1 DO− ∆VOD2 Change in Magnitude of Min Typ Max 3.3 4.0 Units V 2 2.6 V −400 7 400 mV 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 −40 VCC= 0V, VOUT = 3V VCC = 0V, VOUT = −0.25V 0.03 100 µA −0.08 −100 µA V VIH High Level Input Voltage DI, 2.0 VCC VIL Low Level Input Voltage EN GND 0.8 V IIH High Level Input Current 10 µA 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 VIN= VCC −10 2 VCC µA −1.5 V 100 µA Switching Characteristics (Notes 5, 6) 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 ns Low to High tSKD Differential Skew |tPHLD–tPLHD| tSK1 Skew, Pin to Pin (same device) 1.0 2.0 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%) (Figures 4, 5 ) 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 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 DS012645-2 FIGURE 1. Differential Driver DC Test Circuit 3 www.national.com Parameter Measurement Information (Continued) DS012645-3 FIGURE 2. Differential Driver Propagation Delay and Transition Time Test Circuit DS012645-4 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. DS012645-5 FIGURE 4. Driver Single-Ended TRI-STATE Test Circuit www.national.com 4 Parameter Measurement Information (Continued) DS012645-6 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. DS012645-7 RT is optional although highly recommended to reduce reflection DS012645-8 FIGURE 6. Typical Driver Connection 5 www.national.com Typical Application Information (Continued) DS012645-9 FIGURE 7. Typical Driver Output Waveforms www.national.com 6 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Molded Small Outline Package (M) Order Number DS34LV87TM NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DS34LV87TN NS Package Number N16A 7 www.national.com DS34LV87T Enhanced CMOS Quad Differential Line Driver 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. ure 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. 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