VSC8658 datasheet(87/95 Pages) MICROSEMI

87 / 95 page

Pin Descriptions

VMDS-10242 VSC8658 Datasheet Revision 4.1

Although certain function pins may not be used for a specific application, all power supply pins must be

connected to their respective voltage input.

U2 V2 AB4

VDDIO

3.3 V

2.5 V

1.8 V

I/O power supply

K8 K19 L8 L19 M8 M19 N8 N19 P8

P19 R8 R19 T8 T19 U8 U9 U10 U11

U12 U13 U14 U15 U16 U17 U18 U19

VDD12

1.2 V

Internal digital core voltage

C7 C13 C19 C20 D6 D7 D13 D19 D20

D23 E3 E4 E24 AB24 AC4 AC5 AC7

AC8 AC11 AC12 AC13 AC15 AC16

AC18 AC19 AC20 AC24 AD8 AD19

VDD12A

1.2 V

1.2 V analog power requiring additional PCB power

supply filtering

A2 B1 B2 B26 C5 C8 C9 C14 C15 C18

C24 C26 D5 D8 D9 D14 D15 D18 D24

F3 H1 H2 H3 H4 H26 K1 K2 K9 K10

K11 K12 K13 K14 K15 K16 K17 K18

K23 L9 L10 L11 L12 L13 L14 L15 L16

L17 L18 L23 M9 M10 M11 M12 M13

M14 M15 M16 M17 M18 N9 N10 N11

N12 N13 N14 N15 N16 N17 N18 P9

P10 P11 P12 P13 P14 P15 P16 P17

P18 R9 R10 R11 R12 R13 R14 R15

R16 R17 R18 T9 T10 T11 T12 T13 T14

T15 T16 T17 T18 V4 Y25 Y26 AA4

AA24 AB3 AC3 AC6 AC9 AC10 AC14

AC17 AC21 AC22 AC23 AD4 AD6 AD9

AD10 AD13 AD15 AD16 AD18 AD22

AD23 AD24 AE1 AE26

VSS

0 V

General device ground

Table 89 •

Power Supply and Associated Function Pins

Nominal

Voltage

Associated Functional Pins

VDD33

3.3 V

LED[3:0]_n, GPIO[15:0], EECLK, EEDAT, JTAG (5), XTAL1,

XTAL2, CMODE, TXVP_n, TXVN_n, REF_FILT, REF_REXT

VDDIO

1.8 V, 2.5 V,

3.3 V

MDC, MDIO, MDINT_n, nRESET, CLKOUT

VDD12A

1.2 V

MAC_RDP/N_n, MAC_TDP/N_n

VDD12

1.2 V

N/A (Internal Core Voltage)

Table 88 •

Power Supply Pins (continued)

Name

Type

Description

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