Datasheet > 40002A01

40002A01

更新时间： 2022-09-19 00:08:56

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
12页	197K
描述
FEMTOCLOCKS? CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

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40002A01 数据手册

ICS840002-01

FEMTOCLOCKS™ CRYSTAL-TO-

LVCMOS/LVTTL FREQUENCY SYNTHESIZER

Integrated

Circuit

Systems, Inc.

TABLE 1. PIN DESCRIPTIONS

Number

Name

Type

Description

F_SEL0

Input

Pullup

Frequency select pin. LVCMOS/LVTTL interface levels.

Selects between the crystal or TEST_CLK inputs as the PLL reference

nXTAL_SEL

Pulldown source. When HIGH, selects TEST_CLK. When LOW, selects XTAL

inputs. LVCMOS/LVTTL interface levels.

TEST_CLK

Input

Pulldown Single-ended LVCMOS/LVTTL clock input.

Output enable pin. When HIGH, the outputs are active. When LOW, the

Pullup

outputs are in a high impedance state. LVCMOS/LVTTL interface levels.

Active HIGH Master Reset. When logic HIGH, the internal dividers are

Pulldown reset causing active outputs to go low. When logic LOW, the internal

dividers and the outputs are enabled. LVCMOS/LVTTL interface levels.

PLL Bypass. When LOW, the output is driven from the VCO output.

Input

When HIGH, the PLL is bypassed and the output frequency =

nPLL_SEL

Pulldown

reference clock frequency/N output divider.

LVCMOS/LVTTL interface levels.

V_DDA

V_DD

Power

Analog supply pin.

Core supply pin.

XTAL_OUT,

XTAL_IN

Crystal oscillator interface. XTAL_OUT is the output.

XTAL_IN is the input.

Input

12, 13

14, 15

V_DDO

Power

Output

Power

Input

Output supply pin.

Q1, Q0

GND

Single-ended clock outputs. LVCMOS/LVTTL interface levels.

Power supply ground.

F_SEL1

Pullup

Frequency select pin. LVCMOS/LVTTL interface levels.

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

TABLE 2. PIN CHARACTERISTICS

Symbol Parameter

Test Conditions

Minimum Typical Maximum Units

C_IN

Input Capacitance

kΩ

C_PD

Power Dissipation Capacitance

Input Pullup Resistor

R_PULLUP

R_PULLDOWNInput Pulldown Resistor

3.3V 5%

2.5V 5%

R_OUT

Output Impedance

840002AG-01

www.icst.com/products/hiperclocks.html

REV.B JANUARY 13, 2006

123 4 5 6 7...12

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