SCANSTA476 Datasheet, PDF (4/7 Pages) National Semiconductor (TI) – Eight Input IEEE 1149.1 Analog Voltage Monitor

SCANSTA476 Electrical Characteristics (Continued)
The following specifications apply for V_DD = +2.7V to 5.5V, f_TCK = 20 MHz, unless otherwise noted.
Symbol
Parameter
Conditions
Typical
AC ELECTRICAL CHARACTERISTICS
F_MAX
Throughput Rate
INPUT TIMING CHARACTERISTICS
t_SET
t_HOLD
t_SET
t_HOLD
t_W
t_REC
t_W
F_MAX
TDI to TCK (H/L)
TDI to TCK (H/L)
TMS to TCK (H/L)
TMS to TCK (H/L)
TCK Pulse Width (H/L)
Recovery TIme TRST to TCK
TRST Pulse Width (L)
TCK
TCK = 20MHz
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
(Note 3)
Limits
1
2.0
1.5
2.0
2.0
10.0
2.0
2.5
20
Units
MSPS
(max)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
MHz (min)
Note 2: Absolute maximum ratings are limiting values, to be applied individually, and beyond which the serviceability of the circuit may be impaired. Functional
operability under any of these conditions is not implied. Exposure to maximum ratings for extended periods may affect device reliability.
Note 3: Data sheet min/max specification limits are guaranteed by design or statistical analysis.
Note 4: Except power supply pins.
Note 5: For valid measurements, the analog V_IN < V_REF ≤ V_DD.
Applications Information
POWER-UP TIMING
The SCANSTA476 typically requires 1 µs to power up ,
either after first applying V_DD, or after an incomplete conver-
sion shift. To return to normal, one "dummy" conversion must
be fully completed. After this first dummy conversion, the
SCANSTA476 will perform conversions properly.
STARTUP MODE
When the V_DD supply is first applied, the SCANSTA476
requires one dummy conversion after start-up.
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