DS7831/DS8832 Dual TRI-STATE ® Line Driver General Description Features Through simple logic control, the DS7831/DS8832 can be used as either a quad single-ended line driver or a dual differential line driver. They are specifically designed for party line (bus-organized) systems. The DS8832 does not have the VCC clamp diodes found on the DS7831. The DS7831 is specified for operation over the −55˚C to +125˚C military temperature range. The DS8832 is specified for operation over the 0˚C to +70˚C temperature range. n n n n n Series 54/74 compatible 17 ns propagation delay Very low output impedance — high drive capability 40 mA sink and source currents Gating control to allow either single-ended or differential operation n High impedance output state which allows many outputs to be connected to a common bus line Connection and Logic Diagram Dual-In-Line Package DS005800-1 Top View Order Number DS8832J or DS8832N See NS Package Number J16A or N16A For Complete Military 883 Specificatons, See RETS Data Sheet. Order Number DS7831J/883, DS7831W/883, See NS Package Number J16A or W16A TRI-STATE ® is a registered trademark of National Semiconductor Corp. © 1999 National Semiconductor Corporation DS005800 www.national.com DS7831DS8832 Dual TRI-STATE Line Driver May 1999 Truth Table (Shown for A Channels Only) Differential/ “A” Output Disable Single-Ended Input A1 Output A1 Input A2 Output A2 Logical “1” or Same as Logical “1” or Same as Logical “0” Input A1 Logical “0” Input A2 Mode Control 0 0 0 0 1 X X 1 0 0 X 1 Logical “1” or Opposite of Logical “1” or Same as 1 X Logical “0” Input A1 Logical “0” Input A2 X Impedance High X X X Impedance State X = Don’t Care www.national.com 2 High State Absolute Maximum Ratings (Note 2) Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DS7831 DS8831/DS8832 Temperature (TA) DS7831 DS8832 Supply Voltage 7V Input Voltage 5.5V Output Voltage 5.5V Storage Temperature Range −65˚C to +150˚C Lead Temperature (Soldering, 4 sec.) 260˚C Maximum Power Dissipation (Note 1) at 25˚C Cavity Package 1433 mW Molded Package 1362 mW Min Max Units 4.5 4.75 5.5 5.25 V V −55 0 +125 +70 ˚C ˚C Note 1: Derate cavity package 9.6 mW/˚C above 25˚C; derate molded package 10.9 mW/˚C above 25˚C. Electrical Characteristics (Notes 3, 4) Symbol Parameter Conditions VIH Logical “1” Input Voltage VIL Logical “0” Input Voltage VCC = Min VCC = Min VOH Logical “1” Output Voltage DS7831 Max DS7831 VCC = Min IIH Logical “1” Input Current VCC = Max IIL Logical “0” Input Current IOD Output Disable Current ISC Output Short Circuit Current VCC = Max, VIN = 0.4V VCC = Max, VO = 2.4V or 0.4V VCC = Max, (Note 5) ICC Supply Current VCLI Input Diode Clamp Voltage VCLO Output Diode Clamp Voltage 1.8 2.3 V 2.4 2.7 V 1.8 2.5 V IO = −5.2 mA IO = 40 mA IO = 32 mA 2.4 2.9 0.29 0.29 DS7831, VIN = 5.5V DS8832, VIN = 2.4V −40 V 0.50 V 0.40 V 0.50 V 0.40 V 1 mA 40 µA −1.0 −1.6 mA 40 µA −100 −120 mA 90 mA −40 VCC = Max in TRI-STATE VCC = 5.0V, TA = 25˚C, IIN = −12 mA VCC = 5.0V, IOUT = −12 mA DS7831 TA = 25˚C DS8832 IOUT = 12 mA V IO = −40 mA IO = −2 mA IO = −40 mA IO = 40 mA IO = 32 mA DS8832 Units V 0.8 VCC = Min Logical “0” Output Voltage Typ 2.0 DS8832 VOL Min 65 DS7831 −1.5 V −1.5 V VCC + 1.5 V Switching Characteristics TA = 25˚C, VCC = 5V, unless otherwise noted Symbol tpd0 Parameter Conditions Min Typ Max Units 13 25 ns 13 25 ns 6 12 ns 14 22 ns Propagation Delay to a Logical “0” from Inputs A1, A2, B1, B2 Differential Single-ended Mode Control to Outputs tpd1 Propagation Delay to a Logical “1” from Inputs A1, A2, B1, B2 Differential Single-ended Mode Control to Outputs t1H Delay from Disable Inputs to High Impedance State (from Logical “1” (See Figure 4 and Figure 5 ) Level) t0H Delay from Disable Inputs to High Impedance State (from Logical “0” Level) 3 www.national.com Switching Characteristics (Continued) TA = 25˚C, VCC = 5V, unless otherwise noted Symbol tH1 Parameter Conditions Min Typ Max Units 14 22 ns 18 27 ns Propagation Delay from Disable Inputs to Logical “1” Level (from High Impedance State) tH0 Propagation Delay from Disable Inputs to Logical “0” Level (from High Impedance State) Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating Temperature Range” they are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation. Note 3: Unless otherwise specified min/max limits apply across the −55˚C to +125˚C temperature range for the DS7831 and across the 0˚C to +70˚C range for the DS8832. All typical values are for TA = 25˚C and VCC = 5V. Note 4: All currents into device pins shown as positive, out of device pins as negative, all voltage referenced to ground unless otherwise noted. All values shown as max or min on absolute value basis. Note 5: Applies for TA = 125˚C only. Only one output should be shorted at a time. Mode of Operation state. This is accomplished by ensuring that a logical “1” is applied to at least one of the Output Disable pins of each device which is to be in the “high impedance” state. A NOR gate was purposely chosen for this function since it is possible with only two DM5442/DM7442, BCD-to-decimal decoders, to decode as many as 100 DS7831, DS8832’s (Figure 2). The unique device whose Disable inputs receive two logical “0” levels assumes the normal low impedance output state, providing good capacitive drive capability and waveform integrity especially during the transition from the logical “0” to logical ”1” state. The other outputs — in the high impedance state — take only a small amount of leakage current from the low impedance outputs. Since the logical “1” output current from the selected device is 100 times that of a conventional Series 54/74 device (40 mA vs. 400 µA), the output is easily able to supply that leakage current for several hundred other DS7831/DS8831’s, DS7832/DS8832’s and still have available drive for the bus line (Figure 3). To operate as a quad single-ended line driver apply logical “0”s to the output disable pins (to keep the outputs in the normal low impedance mode) and apply logical “0”s to both Differential/Single-ended Mode Control inputs. All four channels will then operate independently and no signal inversion will occur between inputs and outputs. To operate as a dual differential line driver apply logical “0”s to the Output Disable pins and apply at least one logical “1” to the Differential/Single-ended Mode Control inputs. The inputs to the A channels should be connected together and the inputs to the B channels should be connected together. In this mode the signals applied to the resulting inputs will pass non-inverted on the A2 and B2 outputs and inverted on the A1 and B1 outputs. When operating in a bus-organized system with outputs tied directly to outputs of other DS7831, DS8832’s (Figure 1), all devices except one must be placed in the “high impedance” DS005800-2 FIGURE 1. www.national.com 4 Mode of Operation (Continued) DS005800-3 FIGURE 2. DS005800-4 FIGURE 3. 5 www.national.com Typical Performance Characteristics Propagation Delay from Input to Output (Channel 1) Propagation Delay from Input to Output (Channel 1) DS005800-5 Delay from Disable to High Impedance State DS005800-10 Delay from Disable to Low Impedance State DS005800-12 Total Supply Current vs Frequency DS005800-11 Propagation Delay vs Load Capacitance DS005800-13 Logical “1” Output Voltage vs Source Current DS005800-14 Logical “0” Output Voltage vs Sink Current DS005800-16 DS005800-15 IOUT vs VOUT High Impedance Output State DS005800-17 Propagation Delay in Differential Mode DS005800-18 www.national.com Propagation Delay from Input to Output (Channel 2) DS005800-19 6 Typical Performance Characteristics (Continued) DS005800-6 Switching Time Waveforms DS005800-7 Input characteristic: Amplitude = 3.0V Frequency = 1.0 MHz, 50% duty cycle tr = tf ≤ ns (10% to 90%) 7 www.national.com Switching Time Waveforms (Continued) DS005800-8 FIGURE 4. www.national.com 8 AC Load Circuit DS005800-9 Symbol Switch S1 Switch S2 CL tpd1 closed closed 50 pF tpd0 closed closed 50 pF t0H closed closed *5 pF t1H closed closed *5 pF tH0 closed open 50 pF tH1 open closed 50 pF *Jig capacitance FIGURE 5. 9 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number DS7831J or DS8832J NS Package Number J16A www.national.com 10 DS7831DS8832 Dual TRI-STATE Line Driver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number DS8832N NS Package Number N16A 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. 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