DS1648/DS3648/DS1678/DS3678 TRI-STATEÉ TTL to MOS Multiplexers/Drivers General Description The DS1648/DS3648 and DS1678/DS3678 are quad 2-input multiplexers with TRI-STATE outputs designed to drive the large capacitive loads (up to 500 pF) associated with MOS memory systems. A PNP input structure is employed to minimize input currents so that driver loading in large memory systems is reduced. The circuit employs Schottkyclamped transistors for high speed and TRI-STATE outputs for bus operation. The DS1648/DS3648 has a 15X resistor in series with the outputs to dampen transients caused by the fast-switching output. The DS1678/DS3678 has a direct, low impedance output for use with or without an external resistor. Features Y Y Y Y Y Y TRI-STATE outputs interface directly with system-bus Schottky-clamped for better ac performance PNP inputs to minimize input loading TTL compatible High-speed capacitive load drivers Built-in damping resistor (DS1648/DS3648 only) Logic and Connection Diagrams Dual-In-Line Package TL/F/7506 – 2 Top View TL/F/7506 – 1 Order Number DS1648J, DS3648J, DS1678J DS3678J, DS3648N or DS3678N See NS Package Number J16A or N16A TRI-STATEÉ is a registered trademark of National Semiconductor Corp. C1995 National Semiconductor Corporation TL/F/7506 RRD-B30M105/Printed in U. S. A. DS1648/DS3648/DS1678/DS3678 TRI-STATE TTL to MOS Multiplexers/Drivers February 1986 Absolute Maximum Ratings Operating Conditions (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage Logical ‘‘1’’ Input Voltage Logical ‘‘0’’ Input Voltage Storage Temperature Range Maximum Power Dissipation* at 25§ C Cavity Package Molded Package Lead Temperature (Soldering, 10 seconds) Supply Voltage (VCC) Temperature (TA) DS1648, DS1678 DS3648, DS3678 7V 7V Min 4.5 Max 5.5 Units V b 55 a 125 a 70 §C §C 0 b 1.5V b 65§ C to a 150§ C 1433 mW 1362 mW 300§ C * Derate cavity package 9.6 mW/§ C above 25§ C; derate molded package 10.9 mW/§ C above 25§ C. Electrical Characteristics (Notes 2 and 3) Symbol Parameter Conditions Min VIN(1) Logical ‘‘1’’ Input Voltage VIN(0) Logical ‘‘0’’ Input Voltage IIN(1) Logical ‘‘1’’ Input Current VCC e 5.5V, VIN e 5.5V IIN(0) Logical ‘‘0’’ Input Current VCC e 5.5V, VIN e 0.5V VCLAMP Input Clamp Voltage VCC e 4.5V, IIN e b18 mA VOH Logical ‘‘1’’ Output Voltage (No Load) VCC e 4.5V, IOH e b10 mA DS1648/DS1678 2.7 DS3648/DS3678 2.8 VOL Logical ‘‘0’’ Output Voltage (No Load) VCC e 4.5V, IOL e 10 mA DS1648/DS1678 VOH Logical ‘‘1’’ Output Voltage (With Load) VCC e 4.5V, IOH e b1.0 mA VOL Logical ‘‘0’’ Output Voltage (With Load) DS3648/DS3678 Max VCC e 4.5V, IOL e 20 mA V 0.8 V 0.1 40 mA b 50 b 250 mA b 0.75 b 1.2 3.6 V V 3.6 V 0.25 0.4 V 0.25 0.35 V 2.4 3.5 V DS1678 2.5 3.5 V DS3648 2.6 3.5 V DS3678 2.7 3.5 V DS1648 0.6 1.1 V DS1678 0.4 0.5 V DS3648 0.6 1.0 V 0.4 0.5 DS3678 Logical ‘‘1’’ Drive Current VCC e 4.5V, VOUT e 0V, (Note 4) I0D Logical ‘‘0’’ Drive Current VCC e 4.5V, VOUT e 4.5V, (Note 4) IHi-Z TRI-STATE Output Current VOUT e 0.4V to 2.4V, Output Control e 2.0V Power Supply Current VCC e 5.5V Output Control e 3V All Other Inputs at 0V All Inputs at 0V Units DS1648 I1D ICC Typ 2.0 b 250 150 b 40 V mA mA 40 mA 42 60 mA 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 b 55§ C to a 125§ C temperature range for the DS1648 and DS1678 and across the 0§ C to a 70§ C range for the DS3648 and DS3678. All typical values for TA e 25§ C and VCC e 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 15X 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 e 5V, TA e 25§ C (Note 4) Symbol tS g tS ’ tF tR Parameter Conditions (Figure 1) Storage Delay Negative Edge (Figure 1) Storage Delay Positive Edge (Figure 1) Fall Time (Figure 1) Rise Time Typ Max Units CL e 50 pF Min 5 7 ns CL e 500 pF 9 12 ns CL e 50 pF 6 8 ns CL e 500 pF 9 13 ns CL e 50 pF 5 8 ns CL e 500 pF 22 35 ns CL e 50 pF 6 9 ns CL e 500 pF 22 35 ns tZL Delay from Output Control Input to Logical ‘‘0’’ Level (from High Impedance State) CL e 50 pF, RL e 2 kX to VCC, (Figure 2) 10 15 ns tZH Delay from Output Control Input to Logical ‘‘1’’ Level (from High Impedance State) CL e 50 pF, RL e 2 kX to GND (Figure 2) 8 15 ns tLZ Delay from Output Control Input to High Impedance State (from Logical ‘‘0’’ Level) CL e 50 pF, RL e 400X to VCC, 15 25 ns tHZ Delay from Output Control Input to High Impedance State (from Logical ‘‘1’’ Level) CL e 50 pF, RL e 400X to GND, (Figure 3) 10 25 ns tS g Propagation Delay to Logical ‘‘0’’ Transition When Select Selects A CL e 50 pF, (Figure 1) 12 15 ns tS ’ Propagation Delay to Logical ‘‘1’’ Transition When Select Selects A CL e 50 pF, (Figure 1) 14 17 ns tS g Propagation Delay to Logical ‘‘0’’ Transition When Select Selects B CL e 50 pF, (Figure 1) 16 20 ns tS ’ Propagation Delay to Logical ‘‘1’’ Transition When Select Selects B CL e 50 pF, (Figure 1) 14 20 ns (Figure 3) Schematic Diagram TL/F/7506 – 3 *DS1648/DS3648 only 3 AC Test Circuits and Switching Time Waveforms tS g , tS g , TR, tF TL/F/7506 – 5 TL/F/7506 – 4 Note 1: The pulse generator has the following characteristics: ZOUT e 50X and PRR s 1 MHz. Rise and fall times between 10% and 90% points s 5 ns. Note 2: CL includes probe and jig capacitance. FIGURE 1 tZH tZL TL/F/7506 – 8 TL/F/7506 – 7 TL/F/7506–6 *Internal on DS1648 and DS3648 FIGURE 2 tHZ tLZ TL/F/7506 – 11 TL/F/7506 – 10 TL/F/7506–9 *Internal on DS1648 and DS3648 FIGURE 3 Truth Table Output Control Select Inputs A B H L L L L X L L H H X L H X X X X X L H H e High level L e Low level X e Don’t care Hi-Z e TRI-STATE mode 4 Outputs Hi-Z H L H L Typical Applications Addressing 16k RAM 2:1 Multiplexing of RAM Outputs TL/F/7506 – 14 TL/F/7506 – 12 Refreshing Using TRI-STATE Counter TL/F/7506 – 13 5 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 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. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Europe Fax: (a49) 0-180-530 85 86 Email: cnjwge @ tevm2.nsc.com Deutsch Tel: (a49) 0-180-530 85 85 English Tel: (a49) 0-180-532 78 32 Fran3ais Tel: (a49) 0-180-532 93 58 Italiano Tel: (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2309 Fax: 81-043-299-2408 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components.