Datasheet

MPC5674F Microcontroller Data Sheet, Rev. 9
Electrical Characteristics
Freescale Semiconductor30
If V
DD
is powered up first, then all pads are loaded through the drain diodes to V
DDE
/V
DDEH
. This presents a heavy load that
pulls the pad down to a diode above V
SS
. Current injected by external devices connected to the pads must meet the current
injection specification. There is no limit to how long after V
DD
powers up before V
DDE
/V
DDEH
must power up.
The rise times on the power supplies are to be no faster than 25 V/millisecond.
4.6.2 Power-Down
If V
DD
is powered down first, then all drivers are tristated. There is no limit to how long after V
DD
powers down before
V
DDE
/V
DDEH
must power down.
If V
DDE
/V
DDEH
is powered down first, then all pads are loaded through the drain diodes to V
DDE
/V
DDEH
. This presents a heavy
load that pulls the pad down to a diode above V
SS
. Current injected by external devices connected to the pads must meet the
current injection specification. There is no limit to how long after V
DDE
/V
DDEH
powers down before V
DD
must power down.
There are no limits on the fall times for the power supplies.
4.6.3 Power Sequencing and POR Dependent on V
DDA
During power up or down, V
DDA
can lag other supplies (of magnitude greater than V
DDEH
/2) within 1 V to prevent any
forward-biasing of device diodes that causes leakage current and/or POR. If the voltage difference between V
DDA
and V
DDEH
is more than 1 V, the following will result:
• Triggers POR (ADC monitors on V
DDEH1
segment which powers the RESET pin) if the leakage current path created,
when V
DDA
is sufficiently low, causes sufficient voltage drop on V
DDEH1
node monitored crosses low-voltage detect
level.
•If V
DDA
is between 0–2 V, powering all the other segments (especially V
DDEH1
) will not be sufficient to get the part
out of reset.
• Each V
DDEH
will have a leakage current to V
DDA
of a magnitude of ((V
DDEH
–V
DDA
– 1 V(diode drop)/200 KOhms)
up to (V
DDEH
/2 = V
DDA
+1V).
• Each V
DD
has the same behavior; however, the leakage will be small even though there is no current limiting resistor
since V
DD
= 1.32 V max.
4.7 DC Electrical Specifications
Table 14. DC Electrical Specifications
Spec Characteristic Symbol Min Max Unit
1 Core Supply Voltage (External Regulation) V
DD
1.14 1.32
1,2
V
1a Core Supply Voltage (Internal Regulation)
3
V
DD
1.08 1.32 V
2 I/O Supply Voltage (fast I/O pads) V
DDE
3.0 3.6
1,4
V
3 I/O Supply Voltage (medium I/O pads) V
DDEH
3.0 5.25
1,5
V
4 3.3 V I/O Buffer Voltage V
DD33
3.0 3.6
1,4
V
5 Analog Supply Voltage V
DDA
4.75 5.25
1,5
V
6a SRAM Standby Voltage
Keep-out Range: 1.2V–2V
V
STBY_LOW
0.95
6
1.2 V
6b SRAM Standby Voltage
Keep-out Range: 1.2V–2V
V
STBY_HIGH
26V
7 Voltage Regulator Control Input Voltage
7
V
DDREG
2.7
8
5.5
1,5
V