SPEAR300 datasheet(55/83 Pages) STMICROELECTRONICS

Part #	SPEAR300

Description	Embedded MPU with ARM926 core, flexible memory support, powerful connectivity features and human machine interface

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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SPEAr300

Electrical characteristics

Doc ID 16324 Rev 2

55/83

5.7

Power up sequence

It is recommended to power up the power supplies in the order shown in Figure 5. VDD 1.2 is

brought up first, followed by VDD 1.8, then VDD 2.5 and finally VDD 3.3.

Figure 5.

Power-up sequence

5.8

Removing power supplies for power saving

It is recommended to remove the the power supplies in the order shown in Figure 6. So VDD

3.3

supply is to be removed first, then the VDD 2.5 supply, followed by the VDD 1.8 supply and

last the VDD 1.2.

Table 24.

On die termination

Symbol

Parameter

Min

Typ

Max

Unit

RT1*

Termination value of resistance for on die

termination



RT2*

Termination value of resistance for on die

termination

150



Table 25.

Reference voltage

Symbol

Parameter

Min

Typ

Max

Unit

VREFIN

Voltage applied to core/pad

0.49 *

VDDE

0.500 *

VDDE

0.51 *

VDDE

VDD 1.2

VDD1.8

VDD 2.5

VDD 3.3

Power-up sequence

SPEAR300 Datasheet(PDF) 55 Page - STMicroelectronics

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