MCF51JU128VHS FREESCALE [Freescale Semiconductor, Inc], MCF51JU128VHS Datasheet - Page 10

• Manufacturer Part Number: MCF51JU128VHS
• Description: MCF51JU128
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Nonswitching electrical specifications
5.2
5.2.1 Voltage and Current Operating Requirements
1. The device always interprets an input as a 1 when the input is greater than or equal to V
2. The device always interprets an input as a 0 when the input is less than or equal to V
3. All functional non-supply pins are internally clamped to VSS and VDD. Input must be current limited to the value specified.
10
V
V
V
DD
DD
SS
Symbol
V
V
To determine the value of the required current-limiting resistor, calculate resistance values for positive and negative clamp
voltages, then use the larger of the two values. Power supply must maintain regulation within operating VDD range during
instantaneous and operating maximum current conditions. If positive injection current (VIn > VDD) is greater than IDD, the
injection current may flow out of VDD and could result in external power supply going out of regulation. Ensure external
VDD load will shunt current greater than maximum injection current. This will be the greatest risk when the MCU is not
consuming power. Examples are: if no system clock is present, or if clock rate is very low (which would reduce overall
power consumption).
V
V
V
IH
IL
V
V
– V
– V
DDA
I
RAM
DD
IC
IH
IL
(min.), regardless of whether input hysteresis is turned on.
(max.), regardless of whether input hysteresis is turned on.
Nonswitching electrical specifications
DDA
SSA
Symbol
Supply voltage
Analog supply voltage
V
V
Input high voltage
Input low voltage
DC injection current — single pin
DC injection current — total MCU limit, includes sum
of all stressed pins
V
Description
DD
SS
DD
-to-V
• 2.7 V ≤ V
• 1.7 V ≤ V
• 2.7 V ≤ V
• 1.7 V ≤ V
• V
• V
• V
• V
-to-V
voltage required to retain RAM
IN
IN
IN
IN
SSA
DDA
Table 1. Voltage and current operating requirements
> V
< V
> V
< V
differential voltage
differential voltage
DD
SS
DD
SS
DD
DD
DD
DD
3.3 V supply voltage
≤ 3.6 V
≤ 2.7 V
≤ 3.6 V
≤ 2.7 V
MCF51JU128 Data Sheet, Rev. 4, 01/2012.
Description
3.3
0.75 × V
0.7 × V
1.71
1.71
–0.1
–0.1
Min.
1.2
Value
—
—
0
0
0
0
DD
DD
0.35 × V
0.3 × V
IL
Max.
–0.2
3.6
3.6
0.1
0.1
25
–5
—
—
—
(max.) and greater than or equal to
2
IH
DD
(min.) and less than or equal to
DD
V
Freescale Semiconductor, Inc.
Unit
mA
mA
mA
mA
V
V
V
V
V
V
V
V
V
Unit
Notes
1
2
3
3