ICS843252 Ver la hoja de datos (PDF) - Integrated Circuit Systems

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componentes Descripción

Fabricante

ICS843252

FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated Circuit Systems 

Integrated

Circuit

Systems, Inc.

PRELIMINARY

ICS843252

FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL

FREQUENCY SYNTHESIZER

TABLE 1. PIN DESCRIPTIONS

Νυμ βε ρ Ναμ ε

Τψπε

Δ ε σχριπτιον

1, 2

nQB, QB Output

Differential clock outputs. LVPECL interface levels.

3

VCCO_B

Power

Output supply pin for QB, nQB outputs.

4,

5

SELB1,

SELB0

Input

Pullup

Division select pins for Bank B. Default = High.

LVCMOS/LVTTL interface levels.

6

VCCO_A

Power

Output supply pin for QA output.

7, 8

QA, nQA Output

Differential clock outputs. LVPECL interface levels.

Feedback divide select. When Low (default), the feedback divider is set

9

FB_SEL Input Pulldown for ÷25. When HIGH, the feedback divider is set for ÷32.

LVCMOS/LVTTL interface levels.

10

VCCA

Power

Analog supply pin.

11

VCC

Power

Core supply pin.

12,

13

SELA0,

SELA1

Input

Pullup

Division select pins for Bank A. Default = HIGH.

LVCMOS/LVTTL interface levels.

14

15, 16

VEE

XTAL_OUT,

XTAL_IN

Power

Input

Negative supply pin.

Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.

NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.

TABLE 2. PIN CHARACTERISTICS

Symbol

CIN

RPULLDOWN

R

PULLUP

Parameter

Input Capacitance

Input Pulldown Resistor

Input Pullup Resistor

Test Conditions

Minimum

Typical

4

51

51

Maximum

Units

pF

kΩ

kΩ

843252AG

www.icst.com/products/hiperclocks.html

2

REV. A NOVEMBER 9, 2005

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