1. Core
2. Input buffers
ambient temperature. This is an important distinction because dynamic and static power consumption
= Junction-to-ambient of the package.
Region 1: I/O buffers are OFF
Region 2: I/O buffers are ON.
I/Os are functional (except differential inputs)
but slower because VCCI / VCC are below
specification. For the same reason, input
buffers do not meet VIH / VIL levels, and
output buffers do not meet VOH / VOL 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:
V
a
= 0.85 V ± 0.25 V
Deactivation trip point:
V
d
= 0.75 V ± 0.25 V
Activation trip point:
V
a
= 0.9 V ± 0.3 V
Deactivation trip point:
V
d
= 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
but slower because VCCI
is below specification. For the
same reason, input buffers do not
meet VIH / VIL levels, and output
buffers do not meet VOH / VOL levels.
where VT can be from 0.58 V to 0.9 V (typically 0.75 V)
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.
VCC = VCCI + VT