Datasheet > 840NT4-01

840NT4-01

更新时间： 2024-01-15 20:07:40

品牌	Logo	应用领域
艾迪悌 - IDT		/
页数	文件大小	规格书
24页	622K
描述
nullEthernet & USB Clock Generator for Freescale B4/T4-based Systems

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840NT4-01 数据手册

Ethernet & USB Clock Generator for

Freescale B4/T4-based Systems

840NT4-01

DATA SHEET

General Description

Features

The 840NT4-01 is clock generator designed to provide ethernet and

USB clocks for Freescale B4/ T4-based systems. The 840NT4-01

utilizes IDT’s FemtoClock NG^®PLL technology to synthesize eight

low phase-jitter Ethernet reference clocks. The clock generator also

provides a 24MHz USB reference clock and a 25MHz reference

output.

• Ten LVCMOS clock outputs: 

Five LVCMOS 125MHz Ethernet outputs

Three LVCMOS 25MHz /125MHz Ethernet outputs

One LVCMOS 24MHz USB output

One LVCMOS 25MHz REF output

• QREF output can be used to drive other clock drivers, saving a

crystal

Recommended Application:

• Selectable crystal or differential LVPECL input

• Freescale B4/ T4 Ethernet /USB clock generator

• RMS Phase Jitter, 125MHz, integration range 12kHz - 20MHz:

0.60ps (typical)

Output Features:

• Five LVCMOS 125MHz Ethernet outputs

• Cycle-to-Cycle jitter: 20ps (typical)

• Three LVCMOS 25MHz/ 125MHz Ethernet outputs

• One LVCMOS 24MHz USB output

• Flexible voltage supply modes; supports legacy and future system

requirements, minimizes power consumption

Core voltage: V_DD, V_{DD_XTAL}, V_DDA

• One LVCMOS 25MHz REF output

Output voltage: V_{DDO_A}, V_{DDO_B}, V_{DDO_C,}V_{DDO_REF}

Core / Output

3.3V / 3.3V

3.3V / 2.5V

3.3V / 1.8V

2.5V / 2.5V

2.5V / 1.8V

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

• Lead-free (RoHS 6) packaging

Pin Assignment

Table 1. Output Frequency Table

(MHz)

OUT

PD* PLL_ PLL_

(MHz) PSELB SELA SELB QA[4:0] QB[2:0] QC QREF

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

125

VDD

GND_QB

VDDO_B

QB0

PSELB

PLL_SELA

PLL_SELB

GNDA

QB1

QB2

840NT4-01

VDDA

VDDO_B

OE_B

*PD = Phase Detector input frequency.

GND

VDD

VDDO_C

RESERVED

VDD

GND_QC

OE_C

XTAL_SEL

GND_XTAL

GND_REF

2 3 4 5 6 7 8 9 10 11 12

48-lead, 7.0mm x 7.0mm VFQFN

REVISION 2 05/18/15

12 3 4 5 6 7...24

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