Cypress CY2048WAF Manuale utente

Flash Programmable Capacitor Tuning Array Die

for Crystal Oscillator(XO)

CY2048WAF

Cypress Semiconductor Corporation • 3901 North First Street • San Jose,CA 95134 • 408-943-2600

Document #: 38-07738 Rev. *A Revised December 12, 2005

Features

• Flash-programmable capacitor tuning array for low

ppm initial frequency clock output

• Low clock output jitter

— 4 ps typ. RMS period jitter

— ±30 ps typ. peak-to-peak period jitter

• Flash-programmable dividers

• Two-pin programming interface

• On-chip oscillator runs from 10–48-MHz crystal

• Five selectable post-divide options, using reference

oscillator output

• Programmable asynchronous or synchronous OE and

PWR_DWN modes

• 2.7V to 3.6V operation

• Controlled rise and fall times and output slew rate

Benefits

• Enables fine-tuning of output clock frequency by

adjusting CLoad of the crystal

• Allows multiple programming opportunities to correct

errors, and control excess inventory

• Enables programming of output frequency after

packaging

• PPM clock output error can be adjusted in package

• Provides flexibility inoutputconfigurationsandtesting

• Enables low-power operation or output enable function

• Provides flexibility for system applications through

selectable instantaneous or synchronous change in

outputs

•Enables encapsulation in small-size, surface-mount

packages

Block Diagram

Die Pad Description

Horizontal Scribe

Vertical

Scribe

Y (max)

X(max)

OUT

VDD

XIN

PD#/OE 5

7C80330A

XOUT

die#/rev

VSS

Notes:

X(max): 980 µm, Y(max): 988 µm

Bond pad opening: 85 µm x 85 µm

Pad pitch: 175 µm (min.)

Scribe: X = 70 µm, Y = 86 µm

Wafer thickness: 11 mils (Typ.)

PD#/OE

VSS

VDD

(SDATA/VPP)

XIN

XOUT

CRYSTAL

OUT

/ 1, 2, 4, 8, 16

OSCILLATOR

CONFIGURATION

(SCL)

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CY2048WAF

Document #: 38-07738 Rev. *A Page 2 of 7

Die Pad Summary (Pad coordinates are referenced from the center of the die (X = 0, Y = 0))

Name PadNumber Description X coordinate (µm) Y coordinate (µm)

VDD 1Voltage Supply –360.8 353.7

XOUT 2Oscillator Drain –360.8 134.1

XIN 3Oscillator Gate –360.8 –42.6

PD#/OE 4Programmable power-down or output enable pin –360.8 –275.9

VPP High voltage for programming NV memory

SDATA Serial data pin used for programming in test mode

OUT 6Clock output 360.0 353.7

SCL Serial clock for programming in test mode

VSS 5Ground 360.0 –354.5

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CY2048WAF

Document #: 38-07738 Rev. *A Page 3 of 7

Absolute Maximum Conditions

(Above which the useful life may be impaired.

For user guidelines, not tested.)

Supply Voltage (VDD)........................................–0.5 to +7.0V

DC Input Voltage......................................–0.5V to VDD + 0.5

Output Short Circuit Current.....................................± 50 mA

Storage Temperature (Non-condensing) .... –55°C to +125°C

Junction Temperature................................ –40°C to +125°C

Data Retention @ Tj = 125°C................................> 10 years

ESD (Human Body Model) MIL-STD-883.................> 2000V

Note:

1. Not 100% tested.

Crystal Specifications[1]

Parameter Description Comments Min. Typ. Max. Unit

FNOM Nominal crystal frequency Fundamental mode, AT cut 10 – 48 MHz

R1Equivalent series resistance (ESR) Fundamental mode – – 40 Ω

R3/R1Ratio of third overtone mode ESR to

fundamental mode ESR Ratio used because typical R1values are

much less than the maximum spec 4.5 – – –

C0Crystal shunt capacitance – – 5 pF

C1Crystal motional capacitance 2 – – fF

Operating Conditions

Parameter Description Min. Typ. Max. Unit

VDD Operating Voltage 2.7 – 3.6 V

TJJunction Temperature –40 – 125 °C

CXIN Capacitance XIN, all tuning caps OFF – 10 – pF

CXOUT Capacitance XOUT, all tuning caps OFF – 10 – pF

CLAll tuning Caps OFF 4 5 6 pF

All tuning Caps ON 9.2 10 11.4 pF

COUT Output Load Capacitance – – 15 pF

tRAMP Power-up time for VDD to reach minimum specified

voltage (power ramps must be monotonic) 0.05 – 500 ms

TSStart up time, 90% VDD to valid frequency on output – – 10 ms

DC Electrical Specifications TJ = –40 to 125°C over the operating range

Parameter Description Condition Min. Typ. Max. Unit

VIL Input Low Voltage CMOS Levels – – 20 %VDD

VIH Input High Voltage CMOS Levels 80 – – %VDD

VOL Output Low Voltage VDD = 2.7V–3.6V, IOL = 8 mA – – 0.4 V

VOH Output High Voltage VDD = 2.7V–3.6V, IOL = –8 mA VDD–0.4 – – V

IIL Input Low Current Input = VSS –110µA

IIH Input High Current Input = VDD –110µA

IOZL Output Leakage Current Output = VSS –110µA

IOZH Output Leakage Current Output = VDD ––50µA

IDD Power Supply Current No Load, VDD = 3.3V, 48 MHz – – 20 mA

IPD Power Down Current PD# = 0V – – 25 µA

RUP Input Pull-up resistor VIN = VSS 136MΩ

VIN> = 0.8VDD 80 120 150 kΩ

RDN Output Pull-down resistor VIN = 0.5VDD 500 900 1500 kΩ

CIN Input Pin Capacitance PD#/OE pin – – 7 pF

RFCrystal Feedback R XIN = 0 300 – 800 kΩ

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CY2048WAF

Document #: 38-07738 Rev. *A Page 4 of 7

Notes:

2. TPJ2 measured using DTS-2075, # of events set to 10, 000.

AC Electrical Specifications[1] over the operating range, except as noted

Parameter[1] Description Condition Min. Typ. Max. Unit

FOUT Output Frequency 0.625 – 48 MHz

DC Output Duty Cycle XTAL Buffered or Divided 45 50 55 %

TR Rise Time OutputClockRise Time,Measuredfrom 20%to

80% of VDD, COUT = 15 pF. 2.5 ns

TFFall Time Output Clock Fall Time, Measured from 80% to

20% of VDD, COUT = 15 pF. 2.5 ns

tPJ1 RMS Period Jitter XIN = 10–48 MHz. Measured at VDD/2 – 4 15 ps

tPJ2[2] Peak-to-peak Period Jitter XIN = 10–48 MHz. Measured at VDD/2 – 30 80 ps

DL Crystal drive level 48-MHz crystal, CL= 7 pF, C0= 2 pF,

R1 = 10 Ohms, Temp. = 25°C, VDD = 3.6V 350–400 µW

–R Negative Resistance Measured at 48 MHz, CL= 10 pF, C0= 5 pF – – –150 Ω

FDRIFT Output Frequency Drift 3.0V ± 10%, 3.3V ± 10% for Temp. = 25°C –2 – 2 ppm

Phase Noise, Temp = 25°C, VDD = 3.3V,

FNOM = 10MHz, XCAP = 7F (Hex)

Offset dBc/Hz (Typ)

10 Hz –90

100 Hz –115

1 kHz –130

10 kHz –140

100 kHz –140

1 MHz –140

Crystal Oscillator Tuning Capacitor Values

Capacitor Bit Capacitance (pF) per Side

C75.000

C62.500

C51.250

C40.625

C30.313

C20.156

C10.078

C00.039

XOUT

C0C1C2C3C4C5C6C7 C7C6C5C4C3C2C1C0

XIN

CXIN CXOUT

Figure 1. Programmable Load Capacitance

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CY2048WAF

Document #: 38-07738 Rev. *A Page 5 of 7

Timing Parameters over the operating range

Parameter Description Min. Max. Unit

TSTP,SYNC Time from falling edge on PD# to stopped output, synchronous mode, T=1/Fout 1.5T + 350 ns

TSTP,ASYNC Time from falling edge on PD# to stopped output, asynchronous mode 350 ns

TPU,SYNC Time from rising edge on PD# to output at valid frequency, synchronous mode,

T=1/F

out 3ms

TPU,ASYNC Time from rising edge on PD# to output at valid frequency, asynchronous mode 3 ms

TPZX,SYNC Time from rising edge on OE to running output, synchronous mode, T=1/Fout 1.5T + 350 ns

TPZX,ASYNC Time from rising edge on OE to running output, asynchronous mode 350 ns

TPXZ,SYNC Time from falling edge on OE to high impedance output, synchronous mode,

T=1/F

out 1.5T + 350 ns

TPXZ,ASYNC Time from falling edge on OE to high impedance output, asynchronous mode 350 ns

Figure 2. Power-down Timing

CLOC

ASYN

CLOC

SYNC

TSTP

TPU

TSTP

Weakly pulled LOW

CLOCK

SYNC

CLOCK

SYNC

T T

PZX

Weakly pulled LOW

PXZ

Figure 3. Output Enable Timing

tRAMP

VDD - 10%

POWER

OUT

Figure 4. VDD Power-up Timing

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CY2048WAF

Document #: 38-07738 Rev. *A Page 6 of 7

of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be

used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its

products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress

products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

Voltage and Timing Definitions

All product or company names mentioned in this document may be the trademarks of their respective holders.

Test and Measurement Set-up

0.1 µF

VDD Output

CLOAD

GND

DUT

Ordering Information

Ordering Code Package Type Operating Range (TJ)

CY2048WAF[3] Wafer Industrial,–40 °C to 125°C

Note:

3. The product is offered as tested die-on-wafer form. Contact Cypress Sales for additional programming information and support.

Clock

Output

VDD

50% of VDD

Figure 5. Duty Cycle Definition

Clock

Output

tRtF

VDD

80% of V

20% of V

Figure 6.

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CY2048WAF

Document #: 38-07738 Rev. *A Page 7 of 7

Document History Page

Document Title: CY2048WAF Flash Programmable Capacitor Tuning Array Die

for Crystal Oscillator(XO)

Document Number: 38-07738

REV. ECN NO. Issue Date Orig. of

Change Description of Change

** 319840 See ECN RGL New data sheet

*A 413511 See ECN RGL Minor Change: Pls. post in the web

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