SPEAR300 datasheet(53/83 Pages) STMICROELECTRONICS

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SPEAr300

Electrical characteristics

Doc ID 16324 Rev 2

53/83

5.3

DC electrical characteristics

The recommended operating conditions are listed in the following table:

5.4

Overshoot and undershoot

This product can support the following values of overshoot and undershoot.

If the amplitude of the overshoot/undershoot increases (decreases), the ratio of

overshoot/undershoot width to the pulse width decreases (increases). The formula relating

the two is:

Amplitude of OS/US = 0.75*(1- ratio of OS (or US) duration with respect to pulse width)

Note:

The value of overshoot/undershoot should not exceed the value of 0.5 V. However, the

duration of the overshoot/undershoot can be increased by decreasing its amplitude.

The maximum current and power values listed above, obtained with typical supply voltages, are not

guaranteed to be the highest obtainable. These values are dependent on many factors including the type of

applications running, clock rates, use of internal functional capabilities, external interface usage, case

temperature, and the power supply voltages. Your specific application can produce significantly different

results.

1.2 V current and power are primarily dependent on the applications running and the use of internal chip

functions (DMA, USB, Ethernet, and so on).

3.3 V current and power are primarily dependent on the capacitive loading, frequency, and utilization of the

external buses.

Table 17.

Recommended operating conditions

Symbol

Parameter

Min

Typ

Max

Unit

VDD 1.2

Supply voltage for the core

1.14

1.2

1.3

VDD 3.3

Supply voltage for the I/Os

3.3

3.6

VDD 2.5

Supply voltage for the analog blocks

2.25

2.5

2.75

VDD 1.8

Supply voltage for DRAM interface

1.70

1.8

1.9

VDD RTC

RTC supply voltage

1.3

1.5

1.8

Case temperature

-40

°C

Table 18.

Overshoot and undershoot specifications

Parameter

3V3 I/Os

2V5 I/Os

1V8 I/Os

Amplitude

500 mV

Ratio of overshoot (or undershoot) duration with respect to

pulse width

1/3

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