ICS8701CYIT 查看數據表（PDF） - Integrated Device Technology

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ICS8701CYIT

LOW SKEW, ÷1, ÷2 CLOCK GENERATOR

Integrated Device Technology 

ICS8701I

LOW SKEW, ÷1, ÷2

CLOCK GENERATOR

GENERAL DESCRIPTION

The ICS8701I is a low skew, ÷1, ÷2 Clock Generator. The

low impedance LVCMOS outputs are designed to drive 50Ω

series or parallel terminated transmission lines. The

effective fanout can be increased from 20 to 40 by utilizing

the ability of the outputs to drive two series terminated lines.

The divide select inputs, DIV_SELx, control the output

frequency of each bank. The outputs can be utilized in the ÷1,

÷2 or a combination of ÷1 and ÷2 modes. The bank enable

inputs, BANK_EN0:1, support enabling and disabling each

bank of outputs individually. The master reset input, nMR/OE,

resets the internal frequency dividers and also controls the

active and high impedance states of all outputs.

The ICS8701I is characterized at 3.3V and mixed 3.3V input

supply, and 2.5V output supply operating modes. Guaranteed

bank, output and part-to-part skew characteristics make the

ICS8701I ideal for those clock distribution applications de-

manding well defined performance and repeatability.

FEATURES

• Twenty LVCMOS outputs, 7Ω typical output impedance

• LVCMOS / LVTTL clock input

• Maximum input frequency: 250MHz

• Bank enable logic allows unused banks to be disabled

in reduced fanout applications

• Bank skew: 200ps

• Output skew: 250ps

• Multiple frequency skew: 300ps

• Part-to-part skew: 600ps

• 3.3V or mixed 3.3V input, 2.5V output operating supply

• -40°C to 85°C ambient operating temperature

• Other divide values available on request

• Available in both standard and lead-free RoHS compliant

packages

BLOCK DIAGRAM

÷1

CLK

÷2

DIV_SELA

DIV_SELB

DIV_SELC

DIV_SELD

nMR/OE

BANK_EN0

BANK_EN1

1

QA0:QA4

0

1

QB0:QB4

0

1

QC0:QC4

0

1

QD0:QD4

0

Bank Enable

Logic

PIN ASSIGNMENT

QC3

VDDO

QC4

QD0

VDDO

QD1

GND

QD2

GND

QD3

VDDO

QD4

48 47 46 45 44 43 42 41 40 39 38 37

1

36

2

35

3

34

4

33

5

32

6

ICS8701I

31

7

30

8

29

9

28

10

27

11

26

12

25

13 14 15 16 17 18 19 20 21 22 23 24

QB1

VDDO

QB0

QA4

VDDO

QA3

GND

QA2

GND

QA1

VDDO

QA0

48-Pin LQFP

7mm x 7mm x 1.4mm package body

Y Package

Top View

8701CYI

www.idt.com

1

REV. C JULY 27, 2010

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