CD74HCT297 高速 CMOS 逻辑数字锁相环
The ’HC297 and CD74HCT297 are high-speed silicon gate CMOS devices that are pin-compatible with low power Schottky TTL (LSTTL).
These devices are designed to provide a simple, cost-effective solution to high-accuracy, digital, phase-locked-loop applications. They contain all the necessary circuits, with the exception of the divide-by-N counter, to build first-order phase-locked-loops.
Both EXCLUSIVE-OR (XORPD) and edge-controlled phase detectors (ECPD) are provided for maximum flexibility. The input signals for the EXCLUSIVE-OR phase detector must have a 50% duty factor to obtain the maximum lock-range.
Proper partitioning of the loop function, with many of the building blocks external to the package, makes it easy for the designer to incorporate ripple cancellation (see Figure 2) or to cascade to higher order phase-locked-loops
|
CD74HCT297 |
| Voltage Nodes(V) |
6, 5, 2 |
| Rating |
Catalog |
| Technology Family |
HCT |
CD74HCT297 特性
- Digital Design Avoids Analog Compensation Errors
- Easily Cascadable for Higher Order Loops
- Useful Frequency Range
- K-Clock...DC to 55MHz (Typ)
- I/D-Clock...DC to 35MHz (Typ)
- Dynamically Variable Bandwidth
- Very Narrow Bandwidth Attainable
- Power-On Reset
- Output Capability
- Standard...XORPDOUT, ECPDOUT
- Bus Driver...I/DOUT
- Fanout (Over Temperature Range)
- Standard Outputs...10 LSTTL Loads
- Bus Driver Outputs...15 LSTTL Loads
- Balanced Propagation Delay and Transition Times
- Significant Power Reduction Compared to LSTTL Logic ICs
- ’HC297 Types
- Operation Voltage...2 to 6V
- High Noise Immunity NIL = 30%, NIH = 30% of VCC at 5V
- CD74HCT297 Types
CD74HCT297 芯片订购指南
| 器件 |
状态 |
温度 |
价格（美元） |
封装 | 引脚 |
封装数量 | 封装载体 |
丝印标记 |
| CD74HCT297E |
ACTIVE |
-55 to 125 |
2.35 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
|
| CD74HCT297EE4 |
ACTIVE |
-55 to 125 |
2.35 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
|
CD74HCT297 质量与无铅数据
| 器件 |
环保计划* |
铅/焊球涂层 |
MSL 等级/回流焊峰 |
环保信息与无铅 (Pb-free) |
DPPM / MTBF / FIT 率 |
| CD74HCT297E |
Pb-Free (RoHS) |
CU NIPDAU |
N/A for Pkg Type |
CD74HCT297E |
CD74HCT297E |
| CD74HCT297EE4 |
Pb-Free (RoHS) |
CU NIPDAU |
N/A for Pkg Type |
CD74HCT297EE4 |
CD74HCT297EE4 |
CD74HCT297 应用技术支持与电子电路设计开发资源下载
- CD74HCT297 数据资料 dataSheet 下载.PDF
- TI 德州仪器特殊逻辑产品选型与价格 . xls
- Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
- Understanding and Interpreting Standard-Logic Data Sheets (PDF 857 KB)
- TI IBIS File Creation, Validation, and Distribution Processes (PDF 380 KB)
- Implications of Slow or Floating CMOS Inputs (PDF 101 KB)
- CMOS Power Consumption and CPD Calculation (PDF 89 KB)
- Designing With Logic (PDF 186 KB)
- Live Insertion (PDF 150 KB)
- Input and Output Characteristics of Digital Integrated Circuits (PDF 1708 KB)
- Using High Speed CMOS and Advanced CMOS in Systems With Multiple Vcc (PDF 43 KB)
- HiRel Unitrode Power Management Brochure (PDF 206 KB)
- LOGIC Pocket Data Book (PDF 6001 KB)
- HiRel Unitrode Power Management Brochure (PDF 206 KB)
- Logic Cross-Reference (PDF 2938 KB)
