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U1AFS1500-FG256 датащи(PDF) 6 Page - Actel Corporation

номер детали U1AFS1500-FG256
подробное описание детали  3 - DC and Power Characteristics
Download  27 Pages
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производитель  ACTEL [Actel Corporation]
домашняя страница  http://www.actel.com
Logo ACTEL - Actel Corporation

U1AFS1500-FG256 датащи(HTML) 6 Page - Actel Corporation

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DC and Power Characteristics
3- 6
Prel i minary v0 .4
PLL Behavior at Brownout Condition
Actel recommends using monotonic power supplies or voltage regulators to ensure proper power-
up behavior. Power ramp-up should be monotonic at least until VCC and VCCPLX exceed brownout
activation levels. The VCC activation level is specified as 1.1 V worst-case (see Figure 3-1 on page 3-6
for more details).
When PLL power supply voltage and/or VCC levels drop below the VCC brownout levels (0.75 V ±
0.25 V), the PLL output lock signal goes low and/or the output clock is lost. Refer to the Power-
Up/Down of Fusion FPGAs application note for information on clock and lock recovery.
Figure 3-1 • I/O State as a Function of VCCI and VCC Voltage Levels
Region 1: I/O buffers are OFF
Region 2: I/O buffers are ON.
I/Os are functional (except differential inputs)
but slower because V
CCI
/V
CC
are below
specification. For the same reason, input
buffers do not meet V
IH
/V
IL
levels, and
output buffers do not meet V
OH
/V
OL
levels.
Min VCCI datasheet specification
voltage at a selected I/O
standard; i.e., 1.425 V or 1.7 V
or 2.3 V or 3.0 V
VCC
VCC = 1.425 V
Region 1: I/O Buffers are OFF
Activation trip point:
Va = 0.85 V ± 0.25 V
Deactivation trip point:
Vd = 0.75 V ± 0.25 V
Activation trip point:
Va = 0.9 V ±0.3 V
Deactivation trip point:
Vd = 0.8 V ± 0.3 V
VCC = 1.575 V
Region 5: I/O buffers are ON
and power supplies are within
specification.
I/Os meet the entire datasheet
and timer specifications for
speed, VIH/VIL , VOH /VOL , etc.
Region 4: I/O
buffers are ON.
I/Os are functional
(except differential inputs)
but slower because V
CCI
is
below specification. For the
same reason, input buffers do not
meet V
IH
/V
IL
levels, and output
buffers do not meet V
OH
/V
OL
levels.
Where VT can be from 0.58 V to 0.9 V (typically 0.75 V)
VCC = VCCI + VT
VCCI
Region 3: I/O buffers are ON.
I/Os are functional; I/O DC
specifications are met,
but I/Os are slower because
the VCC is below specification


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