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LAN9252/ML データシート(PDF) 316 Page - Microchip Technology

部品番号 LAN9252/ML
部品情報  2/3-Port EtherCAT® Slave Controller with Integrated Ethernet PHYs
PDF  329 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9252/ML データシート(HTML) 316 Page - Microchip Technology

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LAN9252
DS00001909A-page 316
 2015 Microchip Technology Inc.
18.6.2
POWER SEQUENCING TIMING
These diagrams illustrates the device power sequencing requirements. The VDDIO, VDD33, VDD33TXRX1,
VDD33TXRX2, VDD33BIAS and magnetics power supplies must all reach operational levels within the specified time
period tpon. When operating with the internal regulators disabled, VDDCR, OSCVDD12, VDD12TX1 and VDD12TX2 are
also included into this requirement.
In addition, once the VDDIO power supply reaches 1.0 V, it must reach 80% of its operating voltage level (1.44 V when
operating at 1.8 V, 2.0 V when operating at 2.5 V, 2.64 V when operating at 3.3 V) within an additional 15ms. This
requirement can be safely ignored if using an external reset as shown in Section 18.6.3, "Reset and Configuration Strap
Timing".
Device power supplies can turn off in any order provided they all reach 0 volts within the specified time period tpoff.
FIGURE 18-2:
POWER SEQUENCE TIMING - INTERNAL REGULATORS
FIGURE 18-3:
POWER SEQUENCE TIMING - EXTERNAL REGULATORS
TABLE 18-9:
POWER SEQUENCING TIMING VALUES
Symbol
Description
Min
Typ
Max
Units
tpon
Power supply turn on time
-
-
50
ms
tpoff
Power supply turn off time
-
-
500
ms
VDDIO
Magnetics
Power
tpon
tpoff
VDD33, VDD33BIAS,
VDD33TXRX1, VDD33TXRX2
VDDIO
Magnetics
Power
tpon
tpoff
VDD33, VDD33BIAS,
VDD33TXRX1, VDD33TXRX2
VDDCR, OSCVDD12,
VDD12TX1, VDD12TX2



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