Table 20. Slew Rate settings (continued)
Pad type
Load drive (pF)
Frequency of Operation
(MHz) (max)
Slope at rising/falling edge
(ns) (min/max)
Fast Speed Pad
25
72
1/4
50
55
1.5/7
100
40
3/12
200
25
5/18
9.2 Injection Current
All pins implement protection diodes that protect against electrostatic discharge (ESD). In many cases, both digital and
analog pins need to be connected to voltages that are higher than the operating voltage of the device pin. In addition to
providing protection from ESD, these diode structures will also clamp the voltage to a diode drop above the supply of that pin
segment. This is permissible, as long as the current injection is limited as defined in the device specification. Current can be
limited by adding a series resistor on the signal. The input protection diodes will keep the voltage at the pin to a safe level
(per the absolute maximum ratings of the device) as long as it is less than the maximum injection current specification.
Additional circuits on the pins can be enabled only by fast ESD transients. In normal operation, these circuits have no effect
on the pin characteristics and are triggered by fast high voltage transients. To prevent turning on these circuits during normal
power-up sequences, the ramp rate of the power supplies (all external supplies, 5V, and if the internal regulators are not used,
3.3V and 1.2V) should not exceed 25 V/ms.
Below is an extract from the MPC5604P Data Sheet revision 7 dated 04/2011. These specifications may change. Consult the
latest revision of the data sheet to determine if there have been updates to these specifications.
NOTE
Applying signals to pins (~3.3V) during power-off (VDD ~0V) must be considered as a
kind of overload conditions. Series resistors between signal sources and pins may be
needed to limit injection current.
NOTE
Any overload conditions (positive or negative voltage out of V
IH
and V
IL
spec applied to
the pins) should be avoided.
Table 21. Absolute maximum ratings
Symbol
Parameter
Min
Max
Unit
V
IN
Voltage on any pin with
respect to ground
(V
SS_HV
)
V
SS_HV_IO
-0.3
V
DD_HV_IO
+0.3
V
I
INJPAD
Input current on any
pin during overload
condition
-10
10
mA
I
INJSUM
Absolute sum of all
input currents during
overload condition
-50
50
mA
Pin Overview
Hardware Design Guide, Rev. 0, 2012
Freescale Semiconductor, Inc.
23
