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SN74GTL2003 데이터시트(PDF) 11 Page - Texas Instruments |
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SN74GTL2003 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 25 page 0 1 2 3 4 5 6 0 100 200 300 400 500 600 700 800 900 1000 Time (ps) CPU I/O Chipset I/O C001 ( ) ( ) Pullup voltage V 0.35 V Resistor value 0.015 A - W = SN74GTL2003 www.ti.com SCDS305B – FEBRUARY 2011 – REVISED JUNE 2015 Typical Applications (continued) 9.2.1.1 Design Requirements • SN74GTL2003 requires industry standard GTL and LVTTL/TTL voltage levels. • Place pullup resistors of ~200k Ω in all inputs/outputs to the GTL/TTL voltage levels. • Place 0.1- μF bypass capacitors close to the power supply pins to reduce errors coupling in from noisy or high-impedance power supplies. • Comply to the parameters in the Recommended Operating Conditions 9.2.1.2 Detailed Design Procedure 9.2.1.2.1 Sizing Pullup Resistors The pullup resistor value should limit the current through the pass transistor when it is in the on state to about 15 mA. This ensures a pass voltage of 260 mV to 350 mV. If the current through the pass transistor is higher than 15 mA, the pass voltage also is higher in the on state. To set the current through each pass transistor at 15 mA, the pullup resistor value is calculated as: (1) Table 4 shows resistor values for various reference voltages and currents at 15 mA, 10 mA, and 3 mA. The resistor value shown in the +10% column, or a larger value, should be used to ensure that the pass voltage of the transistor would be 350 mV or less. The external driver must be able to sink the total current from the resistors on both sides of the GTL device at 0.175 V, although the 15 mA only applies to current flowing through the SN74GTL2003. Table 4. Pullup Resistor Values(1)(2)(3) PULLUP RESISTOR VALUE ( Ω) 15 mA 10 mA 3 mA VOLTAGE NOMINAL +10% NOMINAL +10% NOMINAL +10% 5.0 V 310 341 465 512 1550 1705 3.3 V 197 217 295 325 983 1082 2.5 V 143 158 215 237 717 788 1.8 V 97 106 145 160 483 532 1.5 V 77 85 115 127 383 422 1.2 V 57 63 85 94 283 312 (1) Calculated for VOL = 0.35 V (2) Assumes output driver VOL = 0.175 V at stated current (3) +10% to compensate for VDD range and resistor tolerance 9.2.1.3 Application Curve Figure 7. Signal Voltage vs Time (ps) (Simulated Design Results) Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: SN74GTL2003 |
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