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Y TRI-STATE outputs interface directly with system-bus Y Schottky-clamped for better ac performance Y PNP inputs to minimize input loading Y TTL compatible Y High-speed capacitive load drivers Y Built-in damping resistor (DS1648/DS3648 only) Logic and Connection Diagrams TL/F/7506 1 Dual-In-Line Package TL/F/7506 2 Top View Order Number DS1648J, DS3648J, DS1678J DS3678J, DS3648N or DS3678N See NS Package Number J16A or N16A TRI STATE É is a registered trademark of National Semiconductor Corp C1995 National Semiconductor Corporation RRD B30M105/Printed in U S A

Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Logical ‘‘1’’ Input Voltage 7V Logical ‘‘0’’ Input Voltage b1.5V Storage Temperature Range b65§Ct o a150§C Maximum Power Dissipation * at 25 §C Cavity Package 1433 mW Molded Package 1362 mW Lead Temperature (Soldering, 10 seconds) 300 §C * Derate cavity package 9.6 mW/ §C above 25 §C; derate molded package 10.9 mW/ §C above 25 §C. Operating Conditions Min Max Units Supply Voltage (V CC) 4.5 5.5 V Temperature (T A) DS1648, DS1678 b55 a125 §C DS3648, DS3678 0 a70 §C Electrical Characteristics (Notes 2 and 3) Symbol Parameter Conditions Min Typ Max Units VIN(1) Logical ‘‘1’’ Input Voltage 2.0 V VIN(0) Logical ‘‘0’’ Input Voltage 0.8 V IIN(1) Logical ‘‘1’’ Input Current V CC 5.5V, V IN 5.5V 0.1 40 mA IIN(0) Logical ‘‘0’’ Input Current V CC 5.5V, V IN 0.5V b50 b250 mA VCLAMP Input Clamp Voltage V CC 4.5V, I IN b18 mA b0.75 b1.2 V VOH Logical ‘‘1’’ Output Voltage V CC 4.5V, I OH b10 mA DS1648/DS1678 2.7 3.6 V (No Load) DS3648/DS3678 2.8 3.6 V VOL Logical ‘‘0’’ Output Voltage V CC 4.5V, I OL 10 mA DS1648/DS1678 0.25 0.4 V (No Load) DS3648/DS3678 0.25 0.35 V VOH Logical ‘‘1’’ Output Voltage V CC 4.5V, I OH b1.0 mA DS1648 2.4 3.5 V (With Load) DS1678 2.5 3.5 V DS3648 2.6 3.5 V DS3678 2.7 3.5 V VOL Logical ‘‘0’’ Output Voltage V CC 4.5V, I OL 20 mA DS1648 0.6 1.1 V (With Load) DS1678 0.4 0.5 V DS3648 0.6 1.0 V DS3678 0.4 0.5 V I1D Logical ‘‘1’’ Drive Current V CC 4.5V, V OUT 0V, (Note 4) b250 mA I0D Logical ‘‘0’’ Drive Current V CC 4.5V, V OUT 4.5V, (Note 4) 150 mA IHi-Z TRI-STATE Output Current V OUT 0.4V to 2.4V, Output Control 2.0V b40 40 mA ICC Power Supply Current V CC 5.5V Output Control 3V 42 60 mAAll Other Inputs at 0V All Inputs at 0V 20 32 mA Note 1: ‘‘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 2: Unless otherwise specified min/max limits apply across the 55§Ct o a125§C temperature range for the DS1648 and DS1678 and across the 0 §Ct o a70§C range for the DS3648 and DS3678. All typical values for T A 25§C and V CC 5V. Note 3: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as max or min on absolute value basis. Note 4: When measuring output drive current and switching response for the DS1678 and DS3678 a 15 X resistor should be placed in series with each output. This resistor is internal to the DS1648/DS3648 and need not be added. 2

Switching Characteristics VCC 5V, T A 25§C (Note 4) Symbol Parameter Conditions Min Typ Max Units tSg Storage Delay Negative Edge (Figure 1) CL 50 pF 5 7 ns CL 500 pF 9 12 ns tS’ Storage Delay Positive Edge (Figure 1) CL 50 pF 6 8 ns CL 500 pF 9 13 ns tF Fall Time (Figure 1) CL 50 pF 5 8 ns CL 500 pF 22 35 ns tR Rise Time (Figure 1) CL 50 pF 6 9 ns CL 500 pF 22 35 ns tZL Delay from Output Control Input to Logical ‘‘0’’ C L 50 pF, R L 2k X to V CC, 10 15 nsLevel (from High Impedance State) (Figure 2) tZH Delay from Output Control Input to Logical ‘‘1’’ C L 50 pF, R L 2k X to GND 81 5n sLevel (from High Impedance State) (Figure 2) tLZ Delay from Output Control Input to High Impedance C L 50 pF, R L 400X to V CC, 15 25 nsState (from Logical ‘‘0’’ Level) (Figure 3) tHZ Delay from Output Control Input to High Impedance C L 50 pF, R L 400X to GND, 10 25 nsState (from Logical ‘‘1’’ Level) (Figure 3) tSg Propagation Delay to Logical ‘‘0’’ Transition When CL 50 pF, (Figure 1) 12 15 nsSelect Selects A tS’ Propagation Delay to Logical ‘‘1’’ Transition When CL 50 pF, (Figure 1) 14 17 nsSelect Selects A tSg Propagation Delay to Logical ‘‘0’’ Transition When CL 50 pF, (Figure 1) 16 20 nsSelect Selects B tS’ Propagation Delay to Logical ‘‘1’’ Transition When CL 50 pF, (Figure 1) 14 20 nsSelect Selects B Schematic Diagram TL/F/7506 3 *DS1648/DS3648 only

2:1 Multiplexing of RAM Outputs TL/F/7506 14 Refreshing Using TRI-STATE Counter TL/F/7506 13

DS1648/DS3648/DS1678/DS3678 TRI-STATE TTL to MOS Multiplexers/Drivers Physical Dimensions inches (millimeters) Ceramic Dual-in-Line Pkg (J) Order Number DS1648J, DS3648J, DS1678J or DS3678J See NS Package Number J16A Molded Dual-in-Line Pkg (N) Order Number DS3648N or DS3678N See 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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