56F8014 datasheet(97/124 Pages) FREESCALE

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DC Electrical Characteristics

56F8014 Technical Data, Rev. 3

Freescale Semiconductor

Preliminary

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 2.5V to the 56F8014’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 VCAP pin. The specifications for this regulator are shown in Table 10-8.

Table 10-7 Power-On Reset Low-Voltage Parameters

Characteristic

Symbol

Min

Typ

Max

Unit

Low-Voltage Interrupt for 3.3V supply1

1. When VDD drops below VEI3.3 maximum value, an interrupt is generated.

VEI3.3

2.65

2.7

—

Low-Voltage Interrupt for 2.5V supply2

2. When VDD drops below VEI32.5 maximum value, an interrupt is generated.

VE12.5

2.05

2.15

—

Low-Voltage Interrupt Recovery Hysteresis

VEIH

—50

—

Power-On Reset3

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 VDD during ramp-up until 2.5V is reached, at which time it self-regulates.

POR

—

1.8

1.9

Table 10-8. Regulator Parameters

Characteristic

Symbol

Min

Typical

Max

Unit

Input Voltage

VIN

3.0

—

3.6

Output Voltage

VOUT

2.25

2.5

2.75

Short Circuit Current

ISS

—450

650

Short Circuit Tolerance

(output shorted to ground)

TRSC

—

Minutes

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