DS75361 Dual TTL-to-MOS Driver General Description Features The DS75361 is a monolithic integrated dual TTL-to-MOS driver interface circuit. The device accepts standard TTL input signals and provides high-current and high-voltage output levels for driving MOS circuits. It is used to drive address, control, and timing inputs for several types of MOS RAMs including the 1103 and MM5270 and MM5280. The DS75361 operates from standard TTL 5V supplies and the MOS VSS supply in many applications. The device has been optimized for operation with VCC2 supply voltage from 16V to 20V; however, it is designed for use over a much wider range of VCC2. Y Y Y Y Y Y Y Y Y Capable of driving high-capacitance loads Compatible with many popular MOS RAMs VCC2 supply voltage variable over wide range to 24V Diode-clamped inputs TTL compatible Operates from standard bipolar and MOS supplies High-speed switching Transient overdrive minimizes power dissipation Low standby power dissipation Schematic and Connection Diagrams Dual-In-Line Package (1/2 shown) TL/F/7557 – 1 Top View Order Number DS75361N See NS Package Number N08E TL/F/7557 – 3 C1995 National Semiconductor Corporation TL/F/7557 RRD-B30M105/Printed in U. S. A. DS75361 Dual TTL-to-MOS Driver September 1992 Absolute Maximum Ratings (Note 1) Lead Temperature 1/16 inch from Case for If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage Range of VCC1 (Note 1) Supply Voltage Range of VCC2 Input Voltage Inter-Input Voltage (Note 4) Storage Temperature Range Maximum Power Dissipation* at 25§ C Molded Package 10 Seconds: N or P Package 200§ C *Derate molded package 8.2 mW/§ above about 25§ C. b 0.5 to 7V Operating Conditions b 0.5V to 25V 5.5V 5.5V b 65§ C to a 150§ C Min 4.75 4.75 0 Supply Voltage (VCC1) Supply Voltage (VCC2) Operating Temperature (TA) Max 5.25 24 a 70 Units V V §C 1022 mW Electrical Characteristics (Notes 2 and 3) Symbol Parameter VIH High-Level Input Voltage VIL Low-Level Input Voltage Conditions Min Typ VI Input Clamp Voltage VOH High-Level Output Voltage VIL e 0.8V, IOH e b50 mA VCC2 b 1 VCC2 b 0.7 VIL e 0.8V, IOH e b10 mA VCC2 b 2.3 VCC2 b 1.8 Low-Level Output Voltage 0.25 0.5 V VI e 5.5V IIH High-Level Input Current Supply Current from VCC2, Both Outputs High ICC1(L) Supply Current from VCC1, Both Outputs Low ICC2(L) Supply Current from VCC2, Both Outputs Low ICC2(S) Supply Current from VCC2, Stand-by Condition V V VI e 0V, IOH e 20 mA ICC2(H) V VCC2 e 15V to 24V, VIH e 2V, IOL e 40 mA Input Current at Maximum Input Voltage Supply Current from VCC1, Both Outputs High V 0.3 Output Clamp Voltage ICC1(H) V b 1.5 0.15 II Low-Level Input Current 0.8 VIH e 2V, IOL e 10 mA VO IIL Units V II e b12 mA VOL Max 2 VI e 2.4V VI e 0.4V VCC2 a 1.5 V 1 mA A Inputs 40 mA E Input 80 mA A Inputs b1 b 1.6 mA E Input b2 b 3.2 mA 2 4 mA 0.5 mA 16 24 mA 7 11 mA 0.5 mA VCC1 e 5.25V, All Inputs at 0V, VCC2 e 24V, No Load VCC1 e 5.25V, All Inputs at 5V, VCC2 e 24V, No Load VCC1 e 0V, All Inputs at 5V, VCC2 e 24V, No Load 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 0§ C to a 70§ C range for the DS75361. All typical values are for TA e 25§ C and VCC1 e 5V and VCC2 e 20V. 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: This rating applies between the A input of either driver and the common E input. 2 Switching Characteristics VCC1 e 5V, VCC2 e 20V, TA e 25§ C Typ Max tDLH Symbol Delay Time, Low-to-High Level Output Parameter Conditions Min 11 20 ns tDHL Delay Time, High-to-Low Level Output 10 18 ns tTLH Transition Time, Low-to-High Level Output 25 40 ns tTHL Transition Time, High-to-Low Level Output 21 35 ns CL e 390 pF, RD e 10X (Figure 1) Units tPLH Propagation Delay Time, Low-to-High Level Output 10 36 55 ns tPHL Propagation Delay Time, High-to-Low Level Output 10 31 47 ns AC Test Circuit and Switching Time Waveforms TL/F/7557 – 4 TL/F/7557 – 5 Note 1: The pulse generator has the following characteristics: PRR e 1 MHz, ZOUT e 50X. Note 2: CL includes probe and jig capacitance. FIGURE 1. Switching Times, Each Driver 3 Typical Performance Characteristics High-Level Output Voltage vs Output Current Low-Level Output Voltage vs Output Current Voltage Transfer Characteristics Total Dissipation (Both Drivers) vs Frequency Propagation Delay Time, Low-to-High Level Output vs Ambient Temperature Propagation Delay Time, High-to-Low Level Output vs Ambient Temperature Propagation Delay Time, Low-to-High Level Output vs VCC2 Supply Voltage Propagation Delay Time, High-to-Low Level Output vs VCC2 Supply Voltage Propagation Delay Time, Low-to-High Level Output vs Load Capacitance Propagation Delay Time, High-to-Low Level Output vs Load Capacitance TL/F/7557 – 2 4 Typical Applications optimum value of the damping resistor to use depends on the specific load characteristics and switching speed. A typical value would be between 10X and 30X (Figure 3) . The fast switching speeds of this device may produce undesirable output transient overshoot because of load or wiring inductance. A small series damping resistor may be used to reduce or eliminate this output transient overshoot. The TL/F/7557 – 7 Note: RD & 10X to 30X (Optional). FIGURE 3. Use of Damping Resistor to Reduce or Eliminate Output Transient Overshoot in Certain DS75361 Applications TL/F/7557 – 6 FIGURE 2. Interconnection of DS75361 Devices with 1103 RAM Thermal Information The DS75361 is so designed that PS is a negligible portion of PT in most applications. Except at very high frequencies, tL a tH n tLH a tHL so that PS can be neglected. The total dissipation curve for no load demonstrates this point. The power dissipation contributions from both channels are then added together to obtain total device power. The following example illustrates this power calculation technique. Assume both channels are operating identically with C e 200 pF, f e 2 MHz, VCC1 e 5V, VCC2 e 20V, and duty cycle e 60% outputs high (tH/T e 0.6). Also, assume VOH e 19.3V, VOL e 0.1V, PS is negligible, and that the current from VCC2 is negligible when the output is high. On a per-channel basis using data sheet values: 2 mA 0 mA a (20V) (0.6) a PDC(AV) e (5V) 2 2 16 mA 7 mA a (20V) (5V) (0.4) 2 2 PDC(AV) e 47 mW per channel PC(AV) & (200 pF) (19.2V)2 (2 MHz) PC(AV) & 148 mW per channel. POWER DISSIPATION PRECAUTIONS Significant power may be dissipated in the DS75361 driver when charging and discharging high-capacitance loads over a wide voltage range at high frequencies. The total dissipation curve shows the power dissipated in a typical DS75361 as a function of load capacitance and frequency. Average power dissipated by this driver can be broken into three components: PT(AV) e PDC(AV) a PC(AV) a PS(AV) where PDC(AV) is the steady-state power dissipation with the output high or low, PC(AV) is the power level during charging or discharging of the load capacitance, and PS(AV) is the power dissipation during switching between the low and high levels. None of these include energy transferred to the load and all are averaged over a full cycle. The power components per driver channel are: Ð # Ð # PLtL a PHtH PDC(AV) e T PC(AV) & C VC2 f PLHtLH a PHLtHL PS(AV) e T where the times are defined in Figure 4 . PL, PH, PLH, and PHL are the respective instantaneous levels of power dissipation and C is load capacitance. J J # J( # J( For the total device dissipation of the two channels: PT(AV) & 2 (47 a 148) PT(AV) & 390 mW typical for total package. TL/F/7557 – 8 FIGURE 4. Output Voltage Waveform 5 DS75361 Dual TTL-to-MOS Driver Physical Dimensions inches (millimeters) Molded Dual-In-Line Package Order Number DS75361N See NS Package Number N08E 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. 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