LXT972 Level One, LXT972 Datasheet - Page 47

• Manufacturer Part Number: LXT972
• Description: 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
• Manufacturer: Level One

Figure 33: Power-Up Timing
Table 33: Power-Up Timing Parameters
Figure 34: RESET Pulse Width and Recovery Timing
Table 34: RESET Pulse Width and Recovery Timing Parameters
Voltage threshold
Power Up delay
RESET pulse width
RESET recovery delay
1. Typical values are at 25° C and are for design aid only; not guaranteed and not subject to production testing.
2. Power Up Delay is specified as a maximum value because it refers to the PHY's guaranteed performance - the PHY will come out of reset after
1. Typical values are at 25° C and are for design aid only; not guaranteed and not subject to production testing.
2. Reset Recovery Delay is specified as a maximum value because it refers to the PHY's guaranteed performance - the PHY will come out of reset
MDIO,etc
a delay of No MORE Than 300
delay No LESS Than 300
after a delay of No MORE Than 300
should delay No LESS Than 300
R E S E T
MDIO,etc
Parameter
Parameter
V C C
2
2
s
before accessing the MDIO port.
s
. System designers should consider this as a minimum value - After threshold v1 is reached, the MAC should
s
before accessing the MDIO port.
s
. System designers should consider this as a minimum value - After de-asserting RESET*, the MAC
Sym
Sym
v1
t1
t1
t2
Min
Min
v1
10
–
–
–
Typ
Typ
2.9
–
–
–
1
1
LXT972 Preliminary Test Specifications
Max
Max
300
300
–
–
t1
t1
Units
Units
ns
V
s
s
t2
Test Conditions
Test Conditions
–
–
–
–
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