The ’HC646 devices consist of bus-transceiver circuits with 3-state outputs, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus is clocked into the registers on the low-to-high transition of the appropriate clock (CLKAB or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that can be performed with the ’HC646 devices.
Output-enable (OE)\ and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode, data present at the high-impedance port may be stored in either or both registers.
The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data
| SN74HC646 | |
| Voltage Nodes(V) | 6, 5, 2 |
| Vcc range(V) | 2.0 to 6.0 |
| Input Level | CMOS |
| Output Level | CMOS |
| No. of Outputs | 8 |
| Static Current | 0.08 |
| Technology Family | HC |
| Rating | Catalog |
| 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 |
| SN74HC646DW | ACTIVE | -40 to 85 | 1.10 | 1ku | SOIC (DW) | 24 | 25 | TUBE | |
| SN74HC646DWE4 | ACTIVE | -40 to 85 | 1.10 | 1ku | SOIC (DW) | 24 | 25 | TUBE | |
| SN74HC646DWG4 | ACTIVE | -40 to 85 | 1.10 | 1ku | SOIC (DW) | 24 | 25 | TUBE |
| 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 |
| SN74HC646DW | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74HC646DW | SN74HC646DW |
| SN74HC646DWE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74HC646DWE4 | SN74HC646DWE4 |
| SN74HC646DWG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74HC646DWG4 | SN74HC646DWG4 |
