PT7V2727中文资料

Product Features

? 3.3v/5.0v operating voltage

? Uses an inexpensive external crystal

? On-chip VCXO with pull range of 240ppm ? VCXO tuning voltage from 0 to 3.3V ? 10mA output driver at CMOS levels ? Available in SOIC package

Ordering Information

Ordering code Package type Operating Range PT7V2727W 8-Pin SOIC Industrial PT7V3727W 8-Pin SOIC Industrial

Logic Block Diagram

Pin Configuration

Pin Description

Pin Number

2727 3727 Pin Name Type Description

1, 8 1, 8 X1, X2 I Crystal Connection, Connect to a pullable 27MHz crystal 2, 7 6 NC No Connect, Can be float or connected to V CC or GND 3 3 V IN I Voltage Input to VCXO 4 4, 7 GND PWR Ground 5 5 CLKOUT O Clock Output 6 2 V CC PWR Power Supply +3.3v/5.0v

General Description

The PT7V2727/3727 are low-cost, high-performance 3.3V /5.0v VCXO, designed to replace expensive VCXO modules. The on-chip voltage causes clocks to vary by ±120ppm.

They use an inexpensive external pullable crystal at 27MHz to produce the same output frequency.

Applications

z Set-Top Box z

xDSL

1234

5

678

X1VIN

GND

NC X2NC Vcc PT7V2727

SOIC 8 package

CLKOUT

1234

5

678

X1VIN GND

Vcc X2GND NC CLKOUT

PT7V3727

SOIC 8 package

Maximum Ratings

(Above which the useful life may be impaired. For user

guidelines, not tested.)

DC Electrical Characteristics

(Unless otherwise specified, V CC = 3.3V, f O = 27MHz, V IN = 1.65V, Load = 15pF, T A = 25o C)

Sym. Parameter Test

Condition

Pin

Min.

Typ.

Max.Unit

V CC Supply

Voltage V CC 3.153 3.3 3.465V

I CC Supply

Current OE = 3.3V,

C L = 15pF

V CC 5 mA

I OH High-level output voltage V OH = V CC-0.5V CLKOUT -11 -4

I OL Low-level output voltage V OL = 0.5V CLKOUT 4 12

mA

R S *Negative Resistance V IN = 0V X1, X2 -150 ?

f Input Frequency X1, X2 20 27 30 MHz

C L Output Capacitance CLKOUT 15 30 pF

* Note: only reference for design.

AC Electrical Characteristics

(Unless otherwise specified, f O = 27MHz, Load = 15pF, T A = 25o C)

Sym. Parameter Test

Condition

Pin

Min.

Typ.

Max.Unit

t r / t f Rise / Fall time 0.1V CC to 0.9V CC CLKOUT 1.5 6 ns

Duty Output clock duty cycle At V CC/2 CLKOUT45

50

55

% ?f Output frequency pull range V IN from 0V to V CC±120 ppm

t j Cycle to cycle jitter 50 ps Linearity V IN from 0.1 to 0.9V CC±10 %

Oscillator start time Trigger at 0.9V CC 1.5 10 ms

Recommended Crystal Specifications

Description Crystal

Mode of Oscillation Fundamental

Frequency Range 27.000MHz

Frequency Tolerance ±30ppm

Temperature plus Aging Stability ±50ppm

Operating Temperature -20oC to + 70oC

C0/C1 240(max.) Load Capacitance(C L) 18pF

Equivalent Series Resistance(ESR) 35ohms(max.)

Plastic 8-pin SOIC (W) Package

Notes

Pericom Technology Inc.

Email: support@https://www.wendangku.net/doc/6010133730.html, Web Site: https://www.wendangku.net/doc/6010133730.html,, https://www.wendangku.net/doc/6010133730.html,

China: No. 20 Building, 3/F, 481 Guiping Road, Shanghai, 200233, China

Tel: (86)-21-6485 0576 Fax: (86)-21-6485 2181

Asia Pacific: Unit 1517, 15/F, Chevalier Commercial Centre, 8 Wang Hoi Rd, Kowloon Bay, Hongkong Tel: (852)-2243 3660 Fax: (852)- 2243 3667

U.S.A.: 3545 North First Street, San Jose, California 95134, USA

Tel: (1)-408-435 0800 Fax: (1)-408-435 1100

Pericom Technology Incorporation reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom Technology does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom Technology product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom Technology Incorporation.