The 'ACT8990 test-bus controllers (TBC) are members of the Texas Instruments SCOPETM testability integrated-circuit family. This family of components supports IEEE Standard 1149.1-1990 (JTAG) boundary scan to facilitate testing of complex circuit-board assemblies. The 'ACT8990 differ from other SCOPETM integrated circuits. Their function is to control the JTAG serial-test bus rather than being target boundary-scannable devices.
The required signals of the JTAG serial-test bus - test clock (TCK), test mode select (TMS), test data input (TDI), and test data output (TDO) can be connected from the TBC to a target device without additional logic. This is done as a chain of IEEE Standard 1149
| SN54ACT8990 | |
| Voltage Nodes(V) | 5 |
| Vcc range(V) | 4.5 to 5.5 |
| Input Level | TTL |
| Output Level | CMOS |
| Rating | Military |
| Technology Family | JTAG |
| 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 |
| SNJ54ACT8990GB | ACTIVE | -55 to 125 | 273.13 | 1ku | CPGA (GB) | 68 | 1 | JEDEC TRAY (5+1) | |
| SNJ54ACT8990HV | ACTIVE | -55 to 125 | 273.13 | 1ku | CFP (HV) | 68 | 1 | 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 |
| SNJ54ACT8990GB | TBD | POST-PLATE | N/A for Pkg Type | SNJ54ACT8990GB | SNJ54ACT8990GB |
| SNJ54ACT8990HV | TBD | Call TI | N/A for Pkg Type | SNJ54ACT8990HV | SNJ54ACT8990HV |
