Datasheet > 840NT4

840NT4

更新时间： 2024-02-01 23:07:52

品牌	Logo	应用领域
艾迪悌 - IDT		双倍数据速率
页数	文件大小	规格书
30页	611K
描述
System & DDR Clocks for Freescale B4/T4 Processor Systems

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840NT4 数据手册

System & DDR Clocks for Freescale

B4/T4 Processor Systems

840NT4

DATA SHEET

General Description

Features

The 840NT4 is a PLL-based clock generator designed to interface

with Freescale B4/T4 Processor systems. The clock generator offers

low jitter, low-skew clock outputs, frequency margining (0.025 -

0.312MHz step granularity), and spread spectrum clocking that

meets the ever-growing demands of Freescale’s next generation

processors.

• Ten LVCMOS clock outputs: four system clocks, four DDR clocks,

one RTC output, and one 25MHz reference clock

• Selectable input reference: crystal oscillator interface or

differential LVPECL input

• Output Frequency Range: 25MHz - 200MHz

• Serial Interface: I²C programmable

• Frequency Margining in <0.312MHz steps

• Spread spectrum for EMI reduction

• VCO range: 2GHz – 2.4GHz

• Voltage supply modes:

Core (V_DD, V_DDXTAL, V_DDA) all core voltages must be identical

Output (V_{DDO_A},V_{DDO_B}, V_{DDO_C,}V_{DDO_REF0}, V_{DDO_REF1}

)

Core / Output

3.3V / 3.3V

3.3V / 2.5V

3.3V / 1.8V

2.5V / 2.5V

2.5V / 1.8V

• Output voltage levels are independently selectable

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

• Lead-free (RoHS 6) packaging

Output Frequency Reference Table

Pin Assignment

SYSCLK

DDRCLK

QC (MHz)

XTAL (MHz)

FSEL[3:0]

QA & QB (MHz)

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

66.67

100

66.67

100

36 35 34 33 32 31 30 29 28 27 26 25

FSEL3

FSEL2

FSEL1

FSEL0

GNDA

OE_C

125

23 GND_QB

133.33

66.67

100

QB2

QB1

20 QB0

100

V_DDA

840NT4

19 V_{DDO_B}

100

125

GND

V_{DDO_A}

100

133.33

66.67

100

V_DD

125

OE_A

OE_B

PLL_SEL

REF_SEL

GND_XTAL

125

14 GND_QA

REFOUT_SEL

125

2 3 4 5 6 7 8 9 10 11 12

125

133.33

66.67

100

133.33

125

133.33

840NT4

48-lead, 7.0mm x 7.0mm VFQFN

REVISION 1 6/16/14

12 3 4 5 6 7...30

中文翻译

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与840NT4相关器件

型号	品牌	获取价格	描述	数据表
840NT4-01	IDT	获取价格	nullEthernet & USB Clock Generator for Freescale B4/T4-based Systems
840NT4-01NLGI	IDT	获取价格	nullEthernet & USB Clock Generator for Freescale B4/T4-based Systems
840NT4-01NLGI8	IDT	获取价格	nullEthernet & USB Clock Generator for Freescale B4/T4-based Systems
840NT4NLGI	IDT	获取价格	System & DDR Clocks for Freescale B4/T4 Processor Systems
840NT4NLGI8	IDT	获取价格	System & DDR Clocks for Freescale B4/T4 Processor Systems
840S05AYILF	IDT	获取价格	Crystal-to-LVCMOS/LVTTL Frequency Synthesizer
840S05AYILFT	IDT	获取价格	Clock Generator, 200MHz, PQFP32, 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, MS-026ABA-HD, TQFP
840S05I	IDT	获取价格	Crystal-to-LVCMOS/LVTTL Frequency Synthesizer
840S06AKILF	IDT	获取价格	CLOCK GENERATOR FOR CAVIUM PROCESSORS
840S06AKILFT	IDT	获取价格	CLOCK GENERATOR FOR CAVIUM PROCESSORS