DS75154 Quad Line Receiver General Description The DS75154 is a quad monolithic line receiver designed to satisfy the requirements of the standard interface between data terminal equipment and data communication equipment as defined by EIA Standard RS-232C. Other applications are in relatively short, single-line, point-to-point data transmission systems and for level translators. Operation is normally from a single 5V supply; however, a built-in option allows operation from a 12V supply without the use of additional components. The output is compatible with most TTL and LS circuits when either supply voltage is used. In normal operation, the threshold-control terminals are connected to the VCC1 terminal, pin 15, even if power is being supplied via the alternate VCC2 terminal, pin 16. This provides a wide hysteresis loop which is the difference between the positive-going and negative-going threshold voltages. In this mode, if the input voltage goes to zero, the output voltage will remain at the low or high level as determined by the previous input. For fail-safe operation, the threshold-control terminals are open. This reduces the hysteresis loop by causing the negative-going threshold voltage to be above zero. The positive-going threshold voltage remains above zero as it is unaffected by the disposition of the threshold terminals. In the fail-safe mode, if the input voltage goes to zero or an open-circuit condition, the output will go to the high level regardless of the previous input condition. Features n Input resistance, 3 kΩ to 7 kΩ over full RS-232C voltage range n Input threshold adjustable to meet “fail-safe” requirements without using external components n Inverting output compatible with TTL or LS n Built-in hysteresis for increased noise immunity n Output with active pull-up for symmetrical switching speeds n Standard supply voltage — 5V or 12V Schematic Diagram DS005795-1 Note: When using VCC1 (pin 15), VCC2 (pin 16) may be left open or shorted to VCC1. When using VCC2, VCC1 must be left open or connected to the threshold control pins. © 1998 National Semiconductor Corporation DS005795 www.national.com DS75154 Quad Line Receiver May 1998 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 (Pin 15), (VCC1) Alternate Supply Voltage (Pin 16), (VCC2) Input Voltage Temperature, (TA) Normal Supply Voltage (Pin 15), (VCC1) 7V Alternate Supply Voltage (Pin 16), 14V (VCC2) ± 25V Input Voltage Storage Temperature Range −65˚C to +150˚C Maximum Power Dissipation (Note 1) at 25˚C SO Package 650 mW Lead Temperature (Soldering, 4 seconds) 260˚C Min 4.5 Max 5.5 Units V 10.8 13.2 ± 15 +70 V V ˚C 0 Note 1: Derate molded DIP package 10.9 mW/˚C above 25˚C; derate SO package 8.01 mW/˚C above 25˚C. Electrical Characteristics (Notes 3, 4, 5) Symbol Parameter Conditions VIH High-Level Input Voltage (Figure 1) VIL Low-Level Input Voltage (Figure 1) VT+ Positive-Going Threshold Voltage (Figure 1) −3 V V V 0.8 2.2 3 0.8 2.2 3 V Normal Operation −3 −1.1 0 V VT+−VT− Hysteresis (Figure 1) VOH High-Level Output Voltage VOL Low-Level Output Voltage IOH = −400 µA, (Figure 1) IOL = 16 mA, (Figure 1) rI Input Resistance (Figure 2) Fail-Safe Operation 0.8 1.4 3 V Normal Operation 0.8 3.3 6 V 0 0.8 2.2 V 2.4 3.5 0.23 0.4 V kΩ Fail-Safe Operation V ∆VI = −25V to −14V 3 5 7 ∆VI = −14V to −3V ∆VI = −3V to +3V 3 5 7 3 6 3 5 7 kΩ 3 5 7 kΩ 0 0.2 2 V −10 −20 −40 mA ∆VI = 3V to 14V ∆VI = 14V to 25V Short-Circuit Output Current Units Fail-Safe Operation (Figure 1) IOS Max Normal Operation Negative-Going Threshold Voltage Open-Circuit Input Voltage Typ 3 VT− VI(OPEN) Min II = 0, (Figure 3) VCC1 = 5.5V, VI = −5V, (Figure 4) kΩ kΩ (Note 6) ICC1 Supply Current From VCC1 ICC2 Supply Current From VCC2 VCC1 = 5.5V, TA = 25˚C, (Figure 5) VCC2 = 13.2V, TA = 25˚C, (Figure 5) 20 35 mA 23 40 mA Typ Max Switching Characteristics (VCC1 = 5V, TA = 25˚C) Symbol tPLH Parameter Propagation Delay Time, Low-to-High Conditions Min Units CL = 50 pF, RL = 390Ω, (Figure 6) 22 ns CL = 50 pF, RL = 390Ω, (Figure 6) 20 ns CL = 50 pF, RL = 390Ω, (Figure 6) 9 ns CL = 50 pF, RL = 390Ω, (Figure 6) 6 ns Level Output tPHL Propagation Delay Time, High-to-Low Level Output tTLH Transition Time, Low-to-High Level Output tTHL Transition Time, High-to-Low Level Output 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 0˚C to +70˚C range for the DS75154. All typical values are for TA = 25˚C and VCC1 = 5V. Note 4: 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. www.national.com 2 Switching Characteristics (Continued) Note 5: The algebraic convention where the most-positive (least-negative) limit is designated as maximum is used in this data sheet for logic and threshold levels only, e.g., when −3V is the maximum, the minimum limit is a more-negative voltage. Note 6: Only one output at a time should be shorted. Typical Performance Characteristics Output Voltage vs Input Voltage DS005795-10 Connection Diagram Dual-In-Line Package DS005795-2 Top View Order Number DS75154M See NS Package Number M16A 3 www.national.com DC Test Circuits and Truth Tables DS005795-3 Test Measure A T Y VCC1 VCC2 (Pin 15) (Pin 16) Open-Circuit Input VOH Open Open IOH 4.5V Open (Fail-Safe) VOH Open Open IOH Open 10.8V VT+ min, VOH 0.8V Open IOH 5.5V Open VT− (Fail-Safe) VOH 0.8V Open IOH Open 13.2V VT+ min (Normal) VOH (Note 7) Pin 15 IOH 5.5V and T Open VOH (Note 7) Pin 15 IOH T 13.2V VIL max, VOH −3V Pin 15 IOH 5.5V and T Open VT− min (Normal) VOH −3V Pin 15 IOH T 13.2V VIH min, VT+ max, VOL 3V Open IOL 4.5V Open VT− max (Fail-Safe) VOL 3V Open IOL Open 10.8V VIH min, VT+ max, VOL 3V Pin 15 IOL 4.5V and T Open (Normal) VOL 3V Pin 15 IOL T 10.8V VOL (Note 8) Pin 15 IOL 5.5V and T Open VOL (Note 8) Pin 15 IOL T 13.2V VT− max (Normal) Note 7: Momentarily apply −5V, then 0.8V. Note 8: Momentarily apply 5V, then ground. FIGURE 1. VIH, VIL, VT+, VT−, VOH, VOL www.national.com 4 DC Test Circuits and Truth Tables (Continued) DS005795-4 T VCC1 VCC2 (Pin 15) (Pin 16) Open 5V Open Open Gnd Open Open Open Open Pin 15 T and 5V Open Gnd Gnd Open Open Open 12V Open Open Gnd Pin 15 T 12V Pin 15 T Gnd Pin 15 T Open FIGURE 2. rI DS005795-5 T VCC1 VCC2 (Pin 15) (Pin 16) Open Open 5.5V Pin 15 5.5V Open Open Open 13.2V Pin 15 T 13.2V FIGURE 3. VI(OPEN) 5 www.national.com DC Test Circuits and Truth Tables (Continued) DS005795-7 DS005795-6 All four line receivers are tested simultaneously. Each output is tested separately. FIGURE 5. ICC FIGURE 4. IOS AC Test Circuit and Switching Time Waveforms DS005795-8 Note 1: The pulse generator has the following characteristics: ZOUT = 50Ω, tW = 200 ns, duty cycle ≤ 20%. Note 2: CL includes probe and jig capacitance. DS005795-9 FIGURE 6. www.national.com 6 7 DS75154 Quad Line Receiver Physical Dimensions inches (millimeters) unless otherwise noted SO Package (M) Order Number DS75154M NS Package Number M16A 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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