Overview
The CDC208DWR, produced by Texas Instruments, is a dual 1-line to 4-line clock driver integrated circuit. This device is designed to fan out one input signal to four outputs with minimal skew, making it ideal for clock distribution applications. The CDC208DWR features two output-enable inputs for each circuit, allowing the outputs to be disabled to a high-impedance state or set to a high or low logic level independent of the input signal. It operates over a temperature range of -40°C to 85°C and is fabricated using the Enhanced-Performance Implanted CMOS (EPIC) 1-µm process.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | -0.5 | - | 7 | V |
| Input Voltage Range (VI) | -0.5 | - | VCC + 0.5 | V |
| Output Voltage Range (VO) | -0.5 | - | VCC + 0.5 | V |
| High-Level Input Voltage (VIH) | - | 2 | - | V |
| Low-Level Input Voltage (VIL) | - | 0.8 | - | V |
| High-Level Output Current (IOH) | -24 | - | - | mA |
| Low-Level Output Current (IOL) | 24 | - | - | mA |
| Input Clock Frequency (fclock) | - | - | 60 | MHz |
| Operating Free-Air Temperature (TA) | -40 | - | 85 | °C |
| Propagation Delay (tPLH, tPHL) | 6.6 | - | 10.2 (tPLH), 9.8 (tPHL) | ns |
| Output Skew (tsk(o)) | 1 | - | - | ns |
Key Features
- Low-Skew Propagation Delay: Ensures minimal skew in clock distribution, making it suitable for high-speed applications.
- TTL-Compatible Inputs and CMOS-Compatible Outputs: Allows for compatibility with a wide range of logic families.
- Flow-Through Architecture: Optimizes PCB layout by reducing the need for complex routing.
- Center-Pin VCC and GND Pin Configurations: Minimizes high-speed switching noise.
- EPIC (Enhanced-Performance Implanted CMOS) 1-µm Process: Enhances performance and reduces power consumption.
- High Latch-Up Immunity: 500-mA typical latch-up immunity at 125°C.
- Output Enable Inputs: Each circuit has two output-enable inputs (OE1 and OE2) to control the output states.
- Package Options: Available in Plastic Small-Outline (DW) and Shrink Small-Outline (NS) packages.
Applications
- Clock Distribution: Ideal for distributing clock signals in digital systems with minimal skew.
- High-Speed Digital Systems: Suitable for use in high-speed digital circuits where precise timing is critical.
- PCB Design Optimization: The flow-through architecture helps in optimizing PCB layout and reducing complexity.
- Mixed-Signal Systems: Compatible with both TTL and CMOS logic levels, making it versatile for mixed-signal designs.
Q & A
- What is the primary function of the CDC208DWR?
The CDC208DWR is a dual clock-driver circuit that fans out one input signal to four outputs with minimum skew for clock distribution.
- What is the operating temperature range of the CDC208DWR?
The device operates from -40°C to 85°C.
- What are the input and output compatibility of the CDC208DWR?
The device has TTL-compatible inputs and CMOS-compatible outputs.
- How does the CDC208DWR minimize high-speed switching noise?
The center-pin VCC and GND pin configurations help minimize high-speed switching noise.
- What is the significance of the EPIC process in the CDC208DWR?
The EPIC (Enhanced-Performance Implanted CMOS) 1-µm process enhances performance and reduces power consumption.
- What are the package options available for the CDC208DWR?
The device is available in Plastic Small-Outline (DW) and Shrink Small-Outline (NS) packages.
- How do the output-enable inputs function in the CDC208DWR?
Each circuit has two output-enable inputs (OE1 and OE2) that can force the outputs to a high-impedance state or to a high or low logic level independent of the input signal.
- What is the maximum input clock frequency for the CDC208DWR?
The maximum input clock frequency is 60 MHz.
- What is the typical latch-up immunity of the CDC208DWR?
The device has a typical latch-up immunity of 500 mA at 125°C.
- How does the flow-through architecture benefit PCB design?
The flow-through architecture optimizes PCB layout by reducing the need for complex routing.
