SPEAR320S datasheet(68/113 Pages) STMICROELECTRONICS

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Electrical characteristics

SPEAr320S

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Doc ID 022508 Rev 2

4.3

Recommended operating conditions

To ensure proper operation of the device, it is highly recommended to follow the conditions

shown in the following table.

4.4

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.

Table 35.

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

PLL supply voltage(1)

For power supply filtering it is required to add an external ferrite inductor.

2.25

2.5

2.75

VDD 2.5

Oscillator supply voltage

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

Ambient temperature(2)

TA to be considered under JESD51 conditions or equivalent ones.

-40

–

°C

Junction temperature

-40

–

125

°C

Table 36.

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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