VSC8658 datasheet(88/95 Pages) MICROSEMI

88 / 95 page

Pin Descriptions

VMDS-10242 VSC8658 Datasheet Revision 4.1

7.2.8

Miscellaneous

The following table lists pins not associated with a particular interface or facility on the device.

Table 90 •

Miscellaneous Pins

Name

Type

Description

H25

J24

J25

J26

K24

K25

K26

L24

CMODE7

CMODE6

CMODE5

CMODE4

CMODE3

CMODE2

CMODE1

CMODE0

Configuration mode (CMODE) pins. For more

information, see CMODE, page 55.

XTAL1/REFCLK I

Crystal oscillator input. If OSCEN=high then a

25 MHz parallel resonant crystal with +/–50 ppm

frequency tolerance should be connected across

XTAL1 and XTAL2. A 33 pF capacitor should also

tie the XTAL1 pin to ground.

Reference clock input. If OSCEN=low, the clock

input frequency can either be 25 MHz

(PLLMODE=0) or 125 MHZ (PLLMODE is high).

XTAL2

OCRYST Crystal oscillator output. The crystal should be

connected across XTAL1 and XTAL2. A 33 pF

capacitor should also tie the XTAL2 pin to ground.

If not using a crystal oscillator, this output pin can

be left floating if driving XTAL1/REFCLK with a

reference clock.

OSCEN

IPD

Oscillator enable. This pin is sampled on the rising

edge of NRESET. If HIGH, then the on-chip

oscillator circuit is enabled. If low (or left floating),

the oscillator circuit is disabled and the device

must be supplied with a 25 MHz or 125 MHz

reference clock to the REFCLK pin

PLLMODE

IPD

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.

J3 J4 K3 K4

L1 L2 M1 M2

L3 L4 M3 M4

P3 P4 R3 R4

T23 T24 R23 R24

P23 P24 N23 N24

P25 P26 N25 N26

M25 M26 L25 L26

LED[3:0]_7

LED[3:0]_6

LED[3:0]_5

LED[3:0]_4

LED[3:0]_3

LED[3:0]_2

LED[3:0]_1

LED[3:0]_0

LED direct-drive outputs. All LEDs pins are active-

low. A serial LED stream can also be

implemented. For more information about LED

operation, see LED Mode Select, page 43.

F23

REF_REXT_A

ABIAS

Reference external connects to an external 2 K

Ω

(1%) resistor to analog ground.

E23

REF_FILT_A

ABIAS

Reference filter connects to an external 1 µF

capacitor to analog ground.

REF_REXT_B

ABIAS

Reference external connects to an external 2 K

Ω

(1%) resistor to analog ground.

VSC8658 bảng dữ liệu(PDF) 88 Page - Microsemi Corporation

VSC8658 bảng dữ liệu(HTML) 88 Page - Microsemi Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95

bảng dữ liệu tải về

Link URL