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LAN9250 Datasheet(PDF) 409 Page - Microchip Technology

Part # LAN9250
Description  Integrated Ethernet PHY with HP Auto-MDIX
PDF  421 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN9250 Datasheet(HTML) 409 Page - Microchip Technology

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 2015 Microchip Technology Inc.
DS00001913A-page 409
LAN9250
19.6.2
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 19.6.3, "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 19-2:
POWER SEQUENCE TIMING - INTERNAL REGULATORS
FIGURE 19-3:
POWER SEQUENCE TIMING - EXTERNAL REGULATORS
TABLE 19-10: 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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