Datasheet

SCANSTA476
SNLS171G –JANUARY 2005–REVISED APRIL 2013 www.ti.com
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 Limits Units
I
ILR
Input Current TRST, TDI, TMS only -300 µA (max)
DIGITAL OUTPUT CHARACTERISTICS (TDO)
I
OH
= -100 µA, 2.7V ≤ V
DD
≤ 5.5V V
DD
−0.2 V (min)
V
OH
Output High Voltage I
OH
= -4 mA, 3.0V ≤ V
DD
≤ 5.5V 2.4 V (min)
I
OH
= -4 mA, V
DD
= 2.7V 2.2 V (min)
I
OL
= 100 µA, 2.7V ≤ V
DD
≤ 5.5V 0.2 V (max)
V
OL
Output Low Voltage
I
OL
= 4 mA, 2.7V ≤ V
DD
≤ 5.5V 0.4 V (max)
I
OS
Output Short Circuit Current V
OUT
= 0V, V
DD
= 5.5V -85 mA (max)
I
OZ
TRI-STATE Leakage Current ±10 µA (max)
Output Coding Straight (Natural) Binary
AC ELECTRICAL CHARACTERISTICS
F
MAX
Throughput Rate TCK = 20MHz 1 MSPS (max)
INPUT TIMING CHARACTERISTICS
t
SET
TDI to TCK (H/L) See
(1)
2.0 ns (min)
t
HOLD
TDI to TCK (H/L) See
(1)
1.5 ns (min)
t
SET
TMS to TCK (H/L) See
(1)
2.0 ns (min)
t
HOLD
TMS to TCK (H/L) See
(1)
2.0 ns (min)
t
W
TCK Pulse Width (H/L) See
(1)
10.0 ns (min)
t
REC
Recovery TIme TRST to TCK See
(1)
2.0 ns (min)
t
W
TRST Pulse Width (L) See
(1)
2.5 ns (min)
F
MAX
TCK 20 MHz (min)
(1) Data sheet min/max specification limits are specified by design or statistical analysis.
APPLICATIONS INFORMATION
POWER-UP TIMING
The SCANSTA476 typically requires 1 µs to power up, either after first applying V
DD
, or after an incomplete
conversion 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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