DS3896/DS3897 January 6, 1996 BTL Trapezoidal™ Transceivers General Description These advanced transceivers are specifically designed to overcome problems associated with driving a densely populated backplane, and thus provide significant improvement in both speed and data integrity. Their low output capacitance, low output signal swing and noise immunity features make them ideal for driving low impedance buses with minimum power consumption. The DS3896 is an octal high speed schottky bus transceiver with common control signals, whereas the DS3897 is a quad device with independent driver input and receiver output pins. The DS3897 has a separate driver disable for each driver and is, therefore, suitable for arbitration lines. The separate driver disable pins (En) feature internal pull ups and may be left open if not required. On the other hand, the DS3896 provides high package density for data/address lines. The open collector drivers generate precise trapezoidal waveforms, which are relatively independent of capacitive loading conditions on the outputs. This significantly reduces noise coupling to adjacent lines. In addition, the receivers use a low pass filter in conjunction with a high speed comparator, to further enhance the noise immunity and provide equal rejection to both negative and positive going noise pulses on the bus. To minimize bus loading, these devices also feature a schottky diode in series with the open collector output that isolates the driver output capacitance in the disabled state. The output low voltage is typically “1V” and the output high level is intended to be 2V. This is achieved by terminating the bus with a pull up resistor to 2V at both ends. The device can drive an equivalent DC load of 18.5Ω (or greater) in the above configuration. These signalling requirements, including a 1 volt signal swing, low output capacitance and precise receiver thresholds are referred to as Bus Transceiver Logic (BTL). Features ■ 8 bit DS3896 transceiver provides high package density ■ 4 bit DS3897 transceiver provides separate driver input ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ and receiver output pins BTL compatible Less than 5 pF output capacitance for minimal bus loading 1 Volt bus signal swing reduces power consumption Trapezoidal driver waveforms (tr, tf ≃ 6 ns typical) reduce noise coupling to adjacent lines Temperature insensitive receiver thresholds track the bus logic high level to maximize noise immunity in both high and low states Guaranteed A.C. specifications on noise immunity and propagation delay over the specified temperature and supply voltage range Open collector driver output allows wire-or connection Advanced low power schottky technology Glitch free power up/down protection on driver and receiver outputs TTL compatible driver and control inputs and receiver outputs Trapezoidal™ is a trademark of National Semiconductor Corporation. © 2009 National Semiconductor Corporation 8510 8510 Version 6 Revision 2 www.national.com Print Date/Time: 2009/07/20 16:46:54 DS3896/DS3897 BTL Trapezoidal Transceivers OBSOLETE DS3896/DS3897 Logic Diagrams DS3896N, M DS3897N, M 851001 851002 Order Numbers DS3896M, DS3896N, DS3897M or DS3897N See NS Package Number M20B or N20A www.national.com 2 8510 Version 6 Revision 2 Print Date/Time: 2009/07/20 16:46:54 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Control Input Voltage Driver Input and Receiver Output Receiver Input and Driver Output Power Dissipation at 70°C N Package M Package Recommended Operating Conditions 6V 5.5V 5.5V 2.5V 1480 mW TBD mW Electrical Characteristics: −65°C to +150°C 260°C Supply Voltage, VCC Bus Termination Voltage Operating Free Air Temperature Min 4.75 1.90 0 Max 5.25 2.10 70 Units V V °C (Notes 2, 3) (0°C ≤ TA ≤ 70°C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units Driver and Control Inputs: (An, Dn, En, CD, T/R , RE , TE ) VIH Logical “1” Input Voltage VIL Logical “0” Input Voltage II Logical “1” Input Current IIH Logical “1” Input Current IIHC 2.0 V 0.8 V An = Dn = En = VCC 1 mA An = Dn = En = 2.4V 40 μA Logical “1” Input Current CD = T/R = RE = TE = 2.4V 80 μA IIL Logical “0” Input Current An = Dn = En = 0.4V −1 −1.6 mA IILC Logical “0” Input Current CD = T/R = RE = TE = 0.4V −180 −400 μA VCL Input Diode Clamp Voltage Iclamp = −12 mA −0.9 −1.5 V 1.0 1.2 V 10 100 μA 100 μA 1.62 V Driver Output/Receiver Input: (Bn) VOLB Low Level Bus Voltage An = Dn = En = T/R = 2V, VL = 2V IIHB Maximum Bus Current (Power On) 0.75 RL = 18.5Ω, CD = TE = 0.8V (Figure 1) An = Dn = En = 0.8V, VCC = 5.25V Bn = 2V IILB Maximum Bus Current (Power Off) An = Dn = En = 0.8V, VCC = 0V Bn = 2V VTH Receiver Input Threshold VCC = 5V 1.47 1.55 Bn = 1.2V, IOH = −400 μA 2.4 3.2 Receiver Output: (An, Rn) VOH Logical “1” Output Voltage VOL Logical “0” Output Voltage V CD = T/R = RE = 0.8V Bn = 2V, IOL = 16 mA 0.35 0.5 V −70 −100 mA CD = T/R = RE = 0.8V IOS Output Short Circuit Current Bn = 1.2V −20 CD = T/R = RE = 0.8V ICC Supply Current (DS3896) VCC = 5.25V 90 135 mA ICC Supply Current (DS3897) VCC = 5.25V 50 80 mA Note 1: “Absolute maximum ratings” are those 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 Characteristic” provide conditions for actual device operation. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 3: All typicals are given for VCC = 5V and Ta = 25°C. DS3896 Switching Characteristics (0°C ≤ TA ≤ 70°C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units 5 9 15 ns 5 9 15 ns Driver: tDLH An to Bn CD = 0.8V, T/R = 2.0V, VL = 2V (Figure 2) tDHL 3 8510 Version 6 Revision 2 Print Date/Time: 2009/07/20 16:46:54 www.national.com DS3896/DS3897 Storage Temperature Range Lead Temperature (Soldering, 4 sec.) Absolute Maximum Ratings (Note 1) DS3896/DS3897 Symbol Parameter Conditions Min Typ Max Units 5 10 18 ns 5 12 20 ns VCI = An, VC = 5V, (Figure 5) 5 15 25 ns CD = 0.8V, RC = 390Ω, CL = 30 pF 5 22 35 ns 3 6 10 ns 3 6 10 ns 5 12 18 ns 5 10 18 ns 5 10 18 ns 5 8 15 ns 2 4 8 ns 3 7 12 ns 5 10 18 ns 14 24 40 ns 2 4 8 ns 2 8 15 ns 3 6 Driver: tDLHC CD to Bn An = T/R = 2.0V, VL = 2V (Figure 2) tDHLC tDLHT T/R to Bn tDHLT RL1 = 18Ω, RL2 = NC, VL = 2V tR Driver Output Rise Time tF Driver Output Fall Time CD = 0.8V, T/R = 2V, VL = 2V (Figure 2) Receiver: tRLH Bn to An CD = 0.8V, T/R = 0.8V (Figure 3) tRHL tRLZC CD to An Bn = 2.0V, T/R = 0.8V, CL = 5 pF RL1 = 390Ω, RL2 = NC, VL = 5V ( Figure 4) tRZLC Bn = 2.0V, T/R = 0.8V, CL = 30 pF RL1 = 390Ω, RL2 = 1.6k, VL = 5V (Figure 4) tRHZC Bn = 0.8V, T/R = 0.8V, VL = 0V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 4) tRZHC Bn = 0.8V, T/R = 0.8V, VL = 0V, RL1 = NC, RL2 = 1.6k, CL = 30 pF (Figure 4) tRLZT T/R to An VCI = Bn, VC = 2V, RC = 18Ω, CD = 0.8V, VL = 5V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 5) tRZLT VCI = Bn, VC = 2V, RC = 18Ω, CD = 0.8V, VL = 5V, RL1 = 390Ω, RL2 = 1.6k, CL = 30 pF (Figure 5) tRHZT VCI = Bn, VC = 0V, RC = 18Ω, CD = 0.8V, VL = 0V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 5) tRZHT tNR VCI = Bn, VC = 0V, RC = 18Ω, CD = 0.8V, VL = 0V, RL1 = NC RL2 = 1.6k, CL = 30 pF (Figure 5) Receiver Noise (Figure 6) ns Rejection Pulse Width Note: NC means open DS3897 Switching Characteristics (0°C ≤ TA ≤ 70°C, 4.75V ≤ VCC ≤ 5.25V unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units 5 9 15 ns Driver: tDLH Dn, En to Bn TE = 0.8V, RE = 2.0V, VL = 2V 5 9 15 ns TE to Bn An = RE = 2.0V, VL = 2V, (Figure 2) 5 10 18 ns RC = 390Ω, VCI = An, VC = 5V, CL = 30 pF 5 12 20 ns 3 6 10 ns 3 6 10 ns (Figure 2) tDHL tDLHT tDHLT RL1 = 18Ω, RL2 = NC, VL = 2V (Figure 5) tR Driver Output Rise Time tF Driver Output Fall Time CD = 0.8V, T/R = 2V, VL = 2V (Figure 2) www.national.com 4 8510 Version 6 Revision 2 Print Date/Time: 2009/07/20 16:46:54 Parameter Conditions Min Typ Max Units 5 10 18 ns 5 12 18 ns 5 10 18 ns 5 8 15 ns 2 4 8 ns 3 7 12 ns 3 6 10 20 30 ns 10 20 30 ns Receiver: tRLH Bn to Rn TE = 2.0V, RE = 0.8V (Figure 3) RE to Rn Bn = TE = 2V, VL = 5V, CL = 5 pF tRHL tRLZR RL1 = 390Ω, RL2 = NC tRZLR (Figure 4) Bn = TE = 2V, VL = 5V, CL = 30 pF RL1 = 390Ω, RL2 = 1.6k (Figure 4) tRHZR Bn = 0.8V, TE = 2V, VL = 0V, RL1 = 390Ω, RL2 = NC, CL = 5 pF (Figure 4) tRZHR Bn = 0.8V, TE = 2V, VL = 0V, RL1 = NC, RL2 = 1.6k, CL = 30 pF tNR (Figure 4) Receiver Noise (Figure 6) ns Rejection Pulse Width Driver plus Receiver: tDRLH Dn to Rn TE = RE = 0.8V (Figure 7) tDRHL Note: NC means open 851003 FIGURE 1. Driver Output Low Voltage Test 851004 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 2. Driver Propagation Delays 5 8510 Version 6 Revision 2 Print Date/Time: 2009/07/20 16:46:54 www.national.com DS3896/DS3897 Symbol DS3896/DS3897 851005 Note: tR = tF ≤ 10 ns from 10% to 90% FIGURE 3. Receiver Propagation Delays 851006 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 4. Propagation Delay from CD pin to An www.national.com 6 8510 Version 6 Revision 2 Print Date/Time: 2009/07/20 16:46:54 DS3896/DS3897 851007 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 5. Propagation Delay from T/R pin to An or Bn 851008 Note: tr = tf = 2 ns from 10% to 90% FIGURE 6. Receiver Noise Immunity: “No Response at Output” Input Waveforms 7 8510 Version 6 Revision 2 Print Date/Time: 2009/07/20 16:46:54 www.national.com DS3896/DS3897 851009 Note: tr = tf ≤ 5 ns from 10% to 90% FIGURE 7. Driver Plus Receiver Delays Typical Application 851010 www.national.com 8 8510 Version 6 Revision 2 Print Date/Time: 2009/07/20 16:46:54 DS3896/DS3897 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead (0.300″ Wide) Molded Small Outline Package, JEDEC (M) Order Number DS3896M or DS2897M NS Package Number M20B Molded Dual-In-Line Package (N) Order Number DS3896N or DS3897N NS Package Number N20A 9 8510 Version 6 Revision 2 Print Date/Time: 2009/07/20 16:46:54 www.national.com DS3896/DS3897 BTL Trapezoidal Transceivers Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Solutions www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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