a2f500m3b-1csh484 Actel Corporation, a2f500m3b-1csh484 Datasheet - Page 18

• Manufacturer Part Number: a2f500m3b-1csh484
• Description: Actel
• Manufacturer: Actel Corporation

SmartFusion DC and Switching Characteristics
Figure 2-1 • I/O State as a Function of VCCxxxxIOBx and VCC Voltage Levels
2 - 6
Deactivation trip point:
V
V
Activation trip point:
a
d
= 0.85 V ± 0.25 V
= 0.75 V ± 0.25 V
VCC = 1.575 V
VCC = 1.425 V
VCC
Region 1: I/O Buffers are OFF
VCC = VCCxxxxIOBx + VT
where VT can be from 0.58 V to 0.9 V (typically 0.75 V)
Deactivation trip point:
Activation trip point:
V
V
a
d
= 0.9 V ± 0.3 V
= 0.8 V ± 0.3 V
Region 2: I/O buffers are ON.
I/Os are functional (except differential inputs)
but slower because VCCxxxxIOBx / V
below specification. For the same reason, input
buffers do not meet VIH / VIL levels, and
output buffers do not meet VOH / VOL levels.
Region 1: I/O buffers are OFF
buffers do not meet VOH / VOL levels.
meet VIH / VIL levels, and output
same reason, input buffers do not
below specification. For the
VCCxxxxIOBx
but slower because
(except differential
I/Os are functional
Min VCCxxxxIOBx datasheet specification
buffers are ON.
R e vi s i o n 3
Region 4: I/O
standard; i.e., 1.425 V or 1.7 V
CC
voltage at a selected I/O
are
or 2.3 V or 3.0 V
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.
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.
VCCxxxxIOBx