VSC8641XKO Vitesse Semiconductor Corp, VSC8641XKO Datasheet - Page 100

• Manufacturer Part Number: VSC8641XKO
• Description: IC PHY 10/100/1000 100-LQFP
• Manufacturer: Vitesse Semiconductor Corp
• Type: PHY Transceiverr

Specifications of VSC8641XKO

• Number Of Drivers/receivers: 1/1
• Protocol: Gigabit Ethernet
• Voltage - Supply: 2.5V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Case: TQFP
• Dc: 07+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 907-1031

Table 87.
6.2.6
Table 88.
Revision 4.3
August 2009
Miscellaneous Pins (continued)
Power Supply
The following table lists the device power supply pins.
Power Supply Pins
1. Exposed pad on the bottom of the package.
Pin
64
55
56
57
58
70
69
60
62, 63
65
Pin
1, 2, 54, 71, 78, 83
61
12
19, 27, 33, 46
5, 16, 48
72
PAD
20, 66, 67, 68, 77,
84, 87, 88
(1)
Name
PLLMODE
LED3
LED2
LED1
LED0
REF_REXT
REF_FILT
REG_EN
REG_OUT
NC
Name
VDD33
VDDREG
VDDIOMICRO
VDDIOMAC
VDD12
VDD12A
VSS
Type
A
A
A
NC
BIAS
BIAS
BIAS
O
I
I
Description
PLL mode input select. Sampled on power-up or reset. If
PLLMODE is low, then REFCLK must be 25 MHz. If
PLLMODE is high, then REFCLK must be 125 MHz.
If a crystal or an external 25 MHz clock is used, PLLMODE
must be pulled low. If an external 125 MHz clock is used,
PLLMODE must be pulled high.
LED direct-drive outputs. All LED pins are active-low. For
more information about LED operation, see
Interface,”
Reference external connects to an external 2 kΩ (1%)
resistor to analog ground.
Reference filter connects to an external 1 μF capacitor to
analog ground.
Regulator enable. Active high input enables the on-chip
switching regulator and generates a 1.2 V supply voltage.
Regulator output. When REG_EN is enabled, REG_OUT
supplies a 1.2 V supply that has been regulated from the
3.3 V supply. When connecting to the 1.2 V supply pins,
additional requirements are a 4.7 µH to 5.1 μH inductor in
series as well as 10 µF and 1 µF capacitors to ground. The
on-chip switching regulator is optional, and 1.2 V power
can be supplied externally.
No connect. Do not connect them together or to ground.
Leave these pins unconnected (floating).
Type
3.3 V
3.3 V
3.3 V
2.5 V
3.3 V
2.5 V
1.2 V
1.2 V
0 V
page 31.
Description
On-chip switching regulator 3.3 V supply.
I/O micro power supply.
I/O MAC power supply.
1.2 V analog power requiring additional
PCB power supply filtering.
General device ground.
General 3.3 V supply.
Internal digital core voltage.
VSC8641 Datasheet
Pin Descriptions
“LED
Page 100