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74AVC16835DGGRG4 Datasheet(PDF) 1 Page - Texas Instruments |
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74AVC16835DGGRG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 17 page SN74AVC16835 18-BIT UNIVERSAL BUS DRIVER WITH 3-STATE OUTPUTS SCES168J – DECEMBER 1998 – REVISED FEBRUARY 2002 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Member of the Texas Instruments Widebus Family D DOC (Dynamic Output Control) Circuit Dynamically Changes Output Impedance, Resulting in Noise Reduction Without Speed Degradation D Dynamic Drive Capability Is Equivalent to Standard Outputs With IOH and IOL of ±24 mA at 2.5-V VCC D Overvoltage-Tolerant Inputs/Outputs Allow Mixed-Voltage-Mode Data Communications D Ioff Supports Partial-Power-Down Mode Operation D ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) D Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II description A Dynamic Output Control (DOC ) circuit is implemented, which, during the transition, initially lowers the output impedance to effectively drive the load and, subsequently, raises the impedance to reduce noise. Figure 1 shows typical VOL vs IOL and VOH vs IOH curves to illustrate the output impedance and drive capability of the circuit. At the beginning of the signal transition, the DOC circuit provides a maximum dynamic drive that is equivalent to a high-drive standard-output device. For more information, refer to TI application reports AVC Logic Family Technology and Applications, literature number SCEA006, and Dynamic Output Control (DOC ) Circuitry Technology and Applications, literature number SCEA009. 136 –128 –144 –160 0.4 0.8 1.2 1.6 2.0 2.4 2.8 170 153 119 102 85 68 51 34 17 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 TA = 25°C Process = Nominal IOL – Output Current – mA VCC = 3.3 V VCC = 2.5 V VCC = 1.8 V TA = 25°C Process = Nominal IOH – Output Current – mA VCC = 3.3 V VCC = 2.5 V VCC = 1.8 V –80 –96 –112 –32 –48 –64 0 –16 Figure 1. Output Voltage vs Output Current This 18-bit universal bus driver is operational at 1.2-V to 3.6-V VCC, but is designed specifically for 1.65-V to 3.6-V VCC operation. Data flow from A to Y is controlled by the output-enable (OE) input. The device operates in the transparent mode when the latch-enable (LE) input is high. The A data is latched if the clock (CLK) input is held at a high or low logic level. If LE is low, the A data is stored in the latch/flip-flop on the low-to-high transition of CLK. When OE is high, the outputs are in the high-impedance state. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. Copyright 2002, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. DOC and Widebus are trademarks of Texas Instruments. |
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