CD74HC257 具有同向三态输出的高速 CMOS 逻辑四路 2 输入多路复用器
The ’HC257 and ’HCT257 are quad 2-input multiplexers which select four bits of data from two sources under the control of a common Select Input (S). The Output Enable input (OE\) is active LOW. When OE\ is HIGH, all of the outputs (1Y-4Y) are in the high impedance state regardless of all other input conditions.
Moving data from two groups of registers to four common output buses is a common use of the 257. The state of the Select input determines the particular register from which the data comes. It can also be used as a function generator
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CD74HC257 |
| Rating |
Catalog |
| Technology Family |
HC |
CD74HC257 特性
- Buffered Inputs
- Typical Propagation Delay (In to Output) = 12ns at VCC = 5V, CL = 15pF, TA = 25°C
- Fanout (Over Temperature Range)
- Standard Outputs...10 LSTTL Loads
- Bus Driver Outputs...15 LSTTL Loads
- Wide Operating Temperature Range...–55°C to 125°C
- Balanced Propagation Delay and Transition Times
- Significant Power Reduction Compared to LSTTL Logic ICs
- HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
- HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il
1uA at VOL, VOH
CD74HC257 芯片订购指南
| 器件 |
状态 |
温度 |
价格 |
封装 | 引脚 |
封装数量 | 封装载体 |
丝印标记 |
| CD74HC257E |
ACTIVE |
-55 to 125 |
0.39 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
|
| CD74HC257EE4 |
ACTIVE |
-55 to 125 |
0.39 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
|
| CD74HC257M |
ACTIVE |
-55 to 125 |
0.42 | 1ku |
SOIC (D) | 16 |
40 | TUBE |
|
| CD74HC257M96 |
ACTIVE |
-55 to 125 |
0.35 | 1ku |
SOIC (D) | 16 |
2500 | LARGE T&R |
|
| CD74HC257M96E4 |
ACTIVE |
-55 to 125 |
0.35 | 1ku |
SOIC (D) | 16 |
2500 | LARGE T&R |
|
| CD74HC257M96G4 |
ACTIVE |
-55 to 125 |
0.35 | 1ku |
SOIC (D) | 16 |
2500 | LARGE T&R |
|
| CD74HC257ME4 |
ACTIVE |
-55 to 125 |
0.42 | 1ku |
SOIC (D) | 16 |
40 | TUBE |
|
| CD74HC257MG4 |
ACTIVE |
-55 to 125 |
0.42 | 1ku |
SOIC (D) | 16 |
40 | TUBE |
|
CD74HC257 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 |
| CD74HC257E |
Pb-Free (RoHS) |
CU NIPDAU |
N/A for Pkg Type |
CD74HC257E |
CD74HC257E |
| CD74HC257EE4 |
Pb-Free (RoHS) |
CU NIPDAU |
N/A for Pkg Type |
CD74HC257EE4 |
CD74HC257EE4 |
| CD74HC257M |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
CD74HC257M |
CD74HC257M |
| CD74HC257M96 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
CD74HC257M96 |
CD74HC257M96 |
| CD74HC257M96E4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
CD74HC257M96E4 |
CD74HC257M96E4 |
| CD74HC257M96G4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
CD74HC257M96G4 |
CD74HC257M96G4 |
| CD74HC257ME4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
CD74HC257ME4 |
CD74HC257ME4 |
| CD74HC257MG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-1-260C-UNLIM |
CD74HC257MG4 |
CD74HC257MG4 |
CD74HC257 应用技术支持与电子电路设计开发资源下载
- CD74HC257 数据资料 dataSheet 下载.PDF
- TI 德州仪器MSI 功能产品选型与价格 . xls
- Logic Guide 2009 (PDF 4263 KB)
- 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)