SN74F657 具有奇偶校验发生器/校验器和三态输出的八路收发器
SN74F657 描述
The SN74F657 contains eight noninverting buffers with 3-state outputs and an 8-bit parity generator/checker. It is intended for bus-oriented applications. The buffers have a specified current sinking capability of 24 mA at the A port and 64 mA at the B port.
The transmit/receive (T/R\) input determines the direction of the data flow through the bidirectional transceivers. When T/R\ is high, data is transmitted from the A port to the B port. When T/R\ is low, data is received at the A port from the B port.
When the output enable (
) input is high, both the A and B ports are placed in a high-impedance state (disabled). The ODD/EVEN\ input allows the user to select between odd or even parity systems
| SN74F657 | |
| Voltage Nodes(V) | 5 |
| Vcc range(V) | 4.5 to 5.5 |
| Input Level | TTL |
| Output Level | TTL |
| Output Drive(mA) | -15/64 |
| No. of Outputs | 8 |
| Logic | True |
| Static Current | 137.5 |
| tpd max(ns) | 8 |
| Rating | Catalog |
| Technology Family | F |
SN74F657 特性
- Combines 'F245 and 'F280B Functions in One Package
- High-Impedance N-P-N Inputs for Reduced Loading (70 uA in Low and High States)
- High Output Drive and Light Bus Loading
- 3-State B Outputs Sink 64 mA and Source 15 mA
- Input Diodes for Termination Effects
- Package Options Include Plastic Small-Outline Packages and Standard Plastic 300-mil DIPs
SN74F657 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 |
| SN74F657DW | ACTIVE | -40 to 85 | 1.80 | 1ku | SOIC (DW) | 24 | 25 | TUBE | F657 |
| SN74F657DWE4 | ACTIVE | -40 to 85 | 1.80 | 1ku | SOIC (DW) | 24 | 25 | TUBE | F657 |
| SN74F657DWG4 | ACTIVE | -40 to 85 | 1.80 | 1ku | SOIC (DW) | 24 | 25 | TUBE | F657 |
SN74F657 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 |
| SN74F657DW | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74F657DW | SN74F657DW |
| SN74F657DWE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74F657DWE4 | SN74F657DWE4 |
| SN74F657DWG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74F657DWG4 | SN74F657DWG4 |
SN74F657 应用技术支持与电子电路设计开发资源下载
- SN74F657 数据资料 dataSheet 下载.PDF
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