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SN74ACT8994 数据表(PDF) 7 Page - Texas Instruments

部件名 SN74ACT8994
功能描述  DIGITAL BUS MONITOR IEEE STD 1149.1 JTAG SCAN-CONTROLLED LOGIC/SIGNATURE ANALYZER
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

SN74ACT8994 数据表(HTML) 7 Page - Texas Instruments

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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


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