SN74AVC16245中文资料具有三态输出的 16 位总线收发器数据手册TI规格书

描述 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 the TI application reports,AVC Logic Family Technology and Applications, literature number SCEA006, and Dynamic Output Control (DOCTM) Circuitry Technology and Applications, literature number SCEA009. This 16-bit (dual octal) noninverting bus transceiver 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. The SN74AVC16245 is designed for asynchronous communication between data buses. The control-function implementation minimizes external timing requirements. This device can be used as two 8-bit transceivers or one 16-bit transceiver. It allows data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE\\) input can be used to disable the device so that the buses are effectively isolated. 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. The SN74AVC16245 is characterized for operation from -40°C to 85°C.

特性 Features

• Member of the Texas InstrumentsWidebusTM Family
• EPICTM (Enhanced-Performance Implanted CMOS) Submicron Process
• DOCTM (Dynamic Output Control) Circuit Dynamically Changes Output Impedance, Resulting in Noise Reduction Without Speed Degradation
• Less Than 2-ns Maximum Propagation Delay at 2.5-V and 3.3-V VCC
• Dynamic Drive Capability Is Equivalent to Standard Outputs With IOH and IOL of ±24 mA at 2.5-V VCC
• Overvoltage-Tolerant Inputs/Outputs Allow Mixed-Voltage-Mode Data Communications
• Ioff Supports Partial-Power-Down Mode Operation
• ESD Protection Exceeds JESD 22
• 2000-V Human-Body Model (A114-A)
• 200-V Machine Model (A115-A)
• Latch-Up Performance Exceeds 250 mA Per JESD 78
• Package Options Include Plastic Thin Shrink Small-Outline (DGG) and Thin Very Small-Outline (DGV) Packages DOC, EPIC, and Widebus are trademarks of Texas Instruments Incorporated.