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SN74ACT8994 数据表(PDF) 7 Page - Texas Instruments |
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SN74ACT8994 数据表(HTML) 7 Page - Texas Instruments |
7 / 11 page SN74ACT8994 DIGITAL BUS MONITOR IEEE STD 1149.1 (JTAG) SCAN-CONTROLLED LOGIC/SIGNATURE ANALYZER SCAS196E – JULY 1990 – REVISED DECEMBER 1996 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 trace/PSA The trace and PSA operations are executed simultaneously. All the configuration options for the trace and PSA operations are available for trace/PSA. In the off-line mode, system test operations are performed via the TAP controller. This is done independent of system conditions. In the on-line mode, the device is configured to perform system test operations that are dependent on system conditions (event-qualified testing) and synchronous to the system clock(s). Eight different event-qualification protocols offer a wide range of test schemes that control when system test operations take place. An event can be configured as a match between expected data from the register files and data at the D inputs (local event-qualified testing). Mask data bits from the register files allow any combination of bits to be ignored when the compare takes place. The EQI pin can also be configured as an event to trigger system test operations (global event-qualified testing). The device can be configured to output one of several different status signals via EQO. These are used for global event-qualified testing. The DBM has instructions that enable the user to perform a self-test on the RAM. This is done by filling the RAM with known values and performing a PSA on its contents. Instructions are included to expedite the loading of the RAM with known values, as well as to perform PSA on the contents of the RAM. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC –0.5 V to 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage range, VI (see Note 1) –0.5 V to VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output voltage range, VO (see Note 1) –0.5 V to VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input clamp current, IIK (VI < 0 or VI > VCC) ±20 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output clamp current, IOK (VO < 0 or VO > VCC) ±20 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous output current, IO (VO = 0 to VCC) ±25 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Maximum power dissipation at TA = 55°C (in still air) (see Note 2) 1.1 W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, Tstg –65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. The input and output voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 2. The maximum package power dissipation is calculated using a junction temperature of 150 °C and a board trace length of 75 mils. For more information, refer to the Package Thermal Considerations application note in the ABT Advanced BiCMOS Technology Data Book, literature number SCBD002. recommended operating conditions MIN MAX UNIT VCC Supply voltage 4.5 5.5 V VIH High-level input voltage 2 V VIL Low-level input voltage 0.8 V VI Input voltage 0 VCC V VO Output voltage 0 VCC V IOH High level output current EQO –4 mA IOH High-level output current PIO, TDO –16 mA IOL Low level output current EQO 4 mA IOL Low-level output current PIO, TDO 16 mA TA Operating free-air temperature 0 70 °C |
类似零件编号 - SN74ACT8994 |
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类似说明 - SN74ACT8994 |
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