The '173 and 'LS173A 4-bit registers include D-type flip-flops featuring totem-pole 3-state outputs capable of driving highly capacitive or relatively low-impedance loads. The high-impedance third state and increased high-logic-level drive provide these flip-flops with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pull-up components. Up to 128 of the SN74173 or SN74LS173A outputs can be connected to a common bus and still drive two Series 54/74 or 54LS/74LS TTL normalized loads, respectively. Similarly, up to 49 of the SN54LS173A or SN54LS173AA outputs can be connected to a common bus and drive one additional Series 54/74 or 54LS/74LS TTL normalized load, respectively
| SN54LS173A | |
| Voltage Nodes(V) | 5 |
| Technology Family | TTL |
| Rating | Military |
| 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 |
| SN54LS173AJ | ACTIVE | -55 to 125 | 4.13 | 1ku | CDIP (J) | 16 | 1 | TUBE | |
| SNJ54LS173AJ | ACTIVE | -55 to 125 | 4.11 | 1ku | CDIP (J) | 16 | 1 | TUBE | |
| SNJ54LS173AW | OBSOLETE | -55 to 125 | CFP (W) | 16 |
| 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 |
| SN54LS173AJ | TBD | A42 | N/A for Pkg Type | SN54LS173AJ | SN54LS173AJ |
| SNJ54LS173AJ | TBD | A42 | N/A for Pkg Type | SNJ54LS173AJ | SNJ54LS173AJ |