56F8013_07 Datasheet, PDF (98/125 Pages) Freescale Semiconductor, Inc – 16-bit Digital Signal Controllers

Table 10-7 Power-On Reset Low-Voltage Parameters
Characteristic
Symbol Min
Typ
Max
Unit
Low-Voltage Interrupt for 3.3V supply¹
V_EI3.3
2.58
2.7
—
V
Low-Voltage Interrupt for 2.5V supply²
V_E12.5
—
2.15
—
V
Low-Voltage Interrupt Recovery Hysteresis
V_EIH
—
50
—
mV
Power-On Reset³
POR
—
1.8
1.9
V
1. When V_DD drops below V_EI3.3, an interrupt is generated.
2. When V_DD drops below V_EI32.5, an interrupt is generated.
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.
10.2.1 Voltage Regulator Specifications
The 56F8013/56F8011 have 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 2.5V to the 56F8013/56F8011’s
core logic. This regulator requires an external 4.4μF, 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.
Table 10-8. Regulator Parameters
Characteristic
Short Circuit Current
Short Circuit Tolerance
(output shorted to ground)
Symbol
Min
Typical
Max
I_SS
—
T_RSC
—
450
650
—
30
Unit
mA
Minutes
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.
56F8013/56F8011 Data Sheet, Rev. 10
98
Freescale Semiconductor
Preliminary