Datasheet > ICS650-21

ICS650-21

更新时间： 2022-12-01 12:20:15

品牌	Logo	应用领域
矽成 - ICSI		时钟
页数	文件大小	规格书
4页	66K
描述
System Peripheral Clock Source

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ICS650-21 数据手册

PRELIMINARY INFORMATION

ICS650-21

System Peripheral Clock Source

Pin Assignment

Processor Clock (MHz)

PSEL1 PSEL0

PCLK1

25.00

37.5

66.66

40.00

33.3334

20.00

PCLK2,3

50.00

75.00

133.33

80.00

66.6667

40.00

PSEL1

USEL

19 PSEL0

18 PCLK2

X1/ICLK

VDD

PCLK3

VDD

33.3334

66.6667

VDD

100

GND

ASEL

USB Clock (MHz)

USEL

UCLK

Audio Clock (MHz)

GND

ASEL

ACLK

49.152

24.576

14.318

UCLK

20M

ACLK

25M

OFF/14.318M

PCLK1

0 = connect directly to ground, 1 = connect directly

to VDD, M=leave unconnected (floating)

20 pin (150 mil) SSOP

Pin Descriptions

Pin #

Name

USEL

X1/ICLK

VDD

GND

UCLK

20M

ACLK

25M

Type Description

UCLK Select pin. Determines frequency of USB clock per table above.

Crystal connection. Connect to parallel mode 25 MHz crystal. Leave open for clock.

Crystal connection. Connect to parallel mode 25 MHz crystal, or clock.

Connect to VDD. Must be same value as other VDD. Decouple with pin 6.

Connect to VDD. Must be same value as other VDD.

Connect to ground.

USB clock output per table above.

Fixed 20 MHz output for Ethernet.

AC97 Audio clock output per table above.

Fixed 25 MHz reference output for Fast Ethernet.

Output Enable. Tri-states all outputs when low.

PCLK1

OFF/14.318M

GND

PCLK output number 1 per table above.

14.31818 MHz clock output only when ASEL=VDD.

Connect to ground.

ASEL

VDD

PCLK3

PCLK2

PSEL0

PSEL1

ACLK Select pin. Determines frequency of Audio clock per table above.

Connect to VDD. Must be same value as other VDD. Decouple with pin 14.

PCLK output number 3 per table above.

PCLK output number 2 per table above.

Processor Select pin #0. Determines frequencies on PCLKs 1-3 per table above.

Processor Select pin #1. Determines frequencies on PCLKs 1-3 per table above.

Key: I = Input; XO/XI = crystal connections; O = output; P = power supply connection

MDS 650-21 A

Revision 010301

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126• (408) 295-9800tel • www.icst.com

123 4

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