Datasheet
56F8014 Technical Data, Rev. 11
98 Freescale Semiconductor
10.2.1 Voltage Regulator Specifications
The 56F8014 has two on-chip regulators. One supplies the PLL and relaxation oscillator. It has no external
pins and therefore has no external characteristics which must be guaranteed (other than proper operation
of the device). The second regulator supplies approximately 2.5 V to the 56F8014’s core logic. This
regulator requires an external 2.2 μF, or greater, capacitor for proper operation. Ceramic and tantalum
capacitors tend to provide better performance tolerances. The output voltage can be measured directly on
the V
CAP
pin. The specifications for this regulator are shown in Table 10-8.
10.3 AC Electrical Characteristics
Tests are conducted using the input levels specified in Table 10-5. Unless otherwise specified,
propagation delays are measured from the 50% to the 50% point, and rise and fall times are measured
between the 10% and 90% points, as shown in Figure 10-2.
Table 10-7 Power-On Reset Low-Voltage Parameters
Characteristic Symbol
Min
Typ Max Unit
Low-Voltage Interrupt for 3.3V supply
1
1. When V
DD
drops below V
EI3.3
, an interrupt is generated.
V
EI3.3
2.60 2.7 — V
Low-Voltage Interrupt for 2.5V supply
2
2. When V
DD
drops below V
EI32.5
, an interrupt is generated.
V
E12.5
2.05 2.15 — V
Low-Voltage Interrupt Recovery Hysteresis V
EIH
—50—mV
Power-On Reset
3
3. Power-On Reset occurs whenever the internally regulated 2.5V digital supply drops below 1.8V. While
power is ramping up, this signal remains active for as long as the internal 2.5V is below 2.15V or the 3.3V
1/O voltage is below 2.7V, no matter how long the ramp-up rate is. The internally regulated voltage is
typically 100mV less than V
DD
during ramp-up until 2.5V is reached, at which time it self-regulates.
POR — 1.8 1.9 V
Table 10-8. Regulator Parameters
Characteristic Symbol Min Typical Max Unit
Input Voltage V
IN
3.0 — 3.6 V
Output Voltage V
OUT
2.25 2.5 2.75 V
Short Circuit Current I
SS
— 450 650 mA
Short Circuit Tolerance
(output shorted to ground)
T
RSC
— — 30 Minutes