m1a3pe1500 Actel Corporation, m1a3pe1500 Datasheet - Page 16

• Manufacturer Part Number: m1a3pe1500
• Description: Proasic3e Flash Family Fpgas With Optional Soft Arm Support
• Manufacturer: Actel Corporation

ProASIC3E DC and Switching Characteristics
Figure 2-1 • I/O State as a Function of V
2 -4
Deactivation trip point:
Activation trip point:
V
V
a
d
= 0.85 V ± 0.25 V
= 0.75 V ± 0.25 V
V
V
CC
CC
= 1.575 V
= 1.425 V
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 V
brownout activation levels. The V
on page 2-4
When PLL power supply voltage and/or V
0.25 V), the PLL output lock signal goes low and/or the output clock is lost. Refer to the
Behavior of ProASIC3/E Devices
recovery.
Internal Power-Up Activation Sequence
V
1. Core
2. Input buffers
3. Output buffers, after 200 ns delay from input buffer activation
CC
for more details).
Region 1: I/O Buffers are OFF
V
where VT can be from 0.58 V to 0.9 V (typically 0.75 V)
Deactivation trip point:
Activation trip point:
CC
V
V
= V
d
a
= 0.9 V ± 0.3 V
= 0.8 V ± 0.3 V
CCI
+ VT
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
specification. For the same reason, input
buffers do not meet V
output buffers do not meet V
buffers do not meet V
CCI
meet V
and V
same reason, input buffers do not
CC
chapter of the handbook for information on clock and lock
below specification. For the
IH
activation level is specified as 1.1 V worst-case (see
/V
CC
but slower because V
IL
(except differential
(except differential inputs)
levels, and output
CCI
Voltage Levels
IH
v1.2
/V
/V
I/Os are functional
I/Os are functional
CC
CC
IL
buffers are ON.
buffers are ON.
OH
levels, and
are below
levels drop below the V
Region 4: I/O
Region 4: I/O
OH
/V
Min V
standard; i.e., 1.425 V or 1.7 V
OL
/V
OL
levels.
voltage at a selected I/O
levels.
CCI
or 2.3 V or 3.0 V
CCI
datasheet specification
is
Region 3: I/O buffers are ON.
I/Os are functional; I/O DC
specifications are met,
but I/Os are slower because
the 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, V
CC
is below specification.
IH
/V
IL
CC
, V
OH
brownout levels (0.75 V ±
/V
OL
CC
, etc.
and V
CCPLXL
Figure 2-1
Power-Up
V
CCI
exceed