Cypress Semiconductor CY7B9910 Manuale utente

CY7B9910

CY7B9920

Low Skew Clock Buffer

Cypress Semiconductor Corporation • 198 Champion Court • San Jose,CA 95134-1709 • 408-943-2600

Document Number: 38-07135 Rev. *B Revised August 07, 2007

Features

■All outputs skew <100 ps typical (250 max.)

■15 to 80 MHz output operation

■Zero input to output delay

■50% duty cycle outputs

■Outputs drive 50Ωterminated lines

■Low operating current

■24-pin SOIC package

■Jitter:<200 ps peak to peak, <25 ps RMS

Functional Description

The CY7B9910 and CY7B9920 Low Skew Clock Buffers offer

low skew system clock distribution. These multiple output clock

drivers optimize the timing of high performance computer

systems.Eachoftheeightindividualdriverscandriveterminated

transmission lines with impedances as low as 50Ω. They deliver

minimal and specified output skews and full swing logic levels

(CY7B9910 TTL or CY7B9920 CMOS).

The completely integrated PLL enables “zero delay” capability.

External divide capability, combined with the internal PLL, allows

distribution of a low frequency clock that is multiplied by virtually

any factor at the clock destination. This facility minimizes clock

distribution difficulty while allowing maximum system clock

speed and flexibility.

Block Diagram Description

Phase Frequency Detector and Filter

The Phase Frequency Detector and Filter blocks accept inputs

from the reference frequency (REF) input and the feedback (FB)

input and generate correction information to control the

frequency of the Voltage Controlled Oscillator (VCO). These

blocks, along with the VCO, form a Phase Locked Loop (PLL)

that tracks the incoming REF signal.

VCO

The VCO accepts analog control inputs from the PLL filter block

and generates a frequency. The operational range of the VCO is

determined by the FS control pin.

TEST

REF

VOLTAGE

CONTROLLED

OSCILLATOR

FS Q0

FILTER

PHASE

FREQ

DET

Logic Block Diagram

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 2 of 11

Pin Configuration

Test Mode

The TEST input is a three level input. In normal system operation, this pin is connected to ground, allowing the CY7B9910 and

CY7B9920 to operate as described in Block Diagram Description. For testing purposes, any of the three level inputs can have a

removable jumper to ground or be tied LOW through a 100W resistor. This enables an external tester to change the state of these pins.

If the TEST input is forced to its MID or HIGH state, the device operates with its internal phase locked loop disconnected and input

levels supplied to REF directly control all outputs. Relative output-to-output functions are the same as in normal mode.

Pin Definitions

Signal Name IO Description

REF IReferencefrequencyinput.Thisinputsuppliesthefrequencyandtiming againstwhichallfunctional

variations are measured.

FB IPLL feedback input (typically connected to one of the eight outputs).

FS[1,2,3] IThree level frequency range select.

TEST IThree level select. See TEST MODE.

Q[0..7] OClock outputs.

VCCN PWR Power supply for output drivers.

VCCQ PWR Power supply for internal circuitry.

GND PWR Ground.

REF

VCCQ

VCCN

GND

VCCN

GND

TEST

GND

VCCN

GND

VCCN

SOIC

Top View

7B9910

7B9920

Notes

1. For all three state inputs, HIGH indicates a connection to VCC, LOW indicates a connection to GND, and MID indicates an open connection. Internal termination

circuitry holds an unconnected input to VCC/2.

2. The level to be set on FS is determined by the “normal” operating frequency (fNOM) of the VCO (see Logic Block Diagram). The frequency appearing at the REF

and FB inputs are fNOM when the output connected to FB is undivided. The frequency of the REF and FB inputs are fNOM/X when the device is configured for a

frequency multiplication by using external division in the feedback path of value X.

3. When the FS pin is selected HIGH, the REF input must not transition upon power up until VCC reached 4.3V.

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 3 of 11

Maximum Ratings

Operating outside these boundaries may affect the performance

and life of the device. These user guidelines are not tested.

Storage Temperature .................................–65°C to +150°C

Ambient Temperature with

Power Applied ............................................–55°C to +125°C

Supply Voltage to Ground Potential................–0.5V to +7.0V

DC Input Voltage ............................................–0.5V to +7.0V

Output Current into Outputs (LOW).............................64 mA

Static Discharge Voltage............................................>2001V

(MIL-STD-883, Method 3015)

Latch Up Current.....................................................>200 mA

Operating Range

Range Ambient

Temperature VCC

Commercial 0°C to +70°C 5V ±10%

Industrial –40°C to +85°C 5V ±10%

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 4 of 11

Electrical Characteristics Over the Operating Range

CY7B9910 CY7B9920

Parameter Description Test Conditions Min Max Min Max Unit

VOH Output HIGH Voltage VCC = Min, IOH = –16 mA 2.4 V

VCC = Min, IOH =–40 mA VCC–0.75

VOL Output LOW Voltage VCC = Min, IOL = 46 mA 0.45 V

VCC = Min, IOL = 46 mA 0.45

VIH Input HIGH Voltage

(REF and FB inputs only) 2.0 VCC VCC –

1.35 VCC V

VIL Input LOW Voltage

(REF and FB inputs only) –0.5 0.8 –0.5 1.35 V

VIHH Three Level Input HIGH

Voltage (Test, FS)[4] Min ≤VCC ≤Max VCC – 1V VCC VCC – 1V VCC V

VIMM Three Level Input MID

Voltage (Test, FS)[4] Min ≤VCC ≤Max VCC/2 –

500 mV VCC/2 +

500 mV VCC/2 –

500 mV VCC/2 +

500 mV V

VILL Three Level Input LOW

Voltage (Test, FS)[4] Min ≤VCC ≤Max 0.0 1.0 0.0 1.0 V

IIH Input HIGH Leakage Current

(REF and FB inputs only) VCC = Max, VIN = Max 10 10 μA

IIL Input LOW Leakage Current

(REF and FB inputs only) VCC = Max, VIN = 0.4V –500 –500 μA

IIHH Input HIGH Current

(Test, FS) VIN = VCC 200 200 μA

IIMM Input MID Current

(Test, FS) VIN = VCC/2 –50 50 –50 50 μA

IILL Input LOW Current

(Test, FS) VIN = GND –200 –200 μA

IOS Output Short Circuit

Current[5] VCC = Max, VOUT

= GND (25°C only) –250 N/A mA

ICCQ Operating Current Used by

Internal Circuitry VCCN = VCCQ = Max All

Input

Selects Open

Com’l 85 85 mA

Mil/Ind 90 90

ICCN Output Buffer Current per

Output Pair[6] VCCN = VCCQ = Max

IOUT = 0 mA

Input Selects Open, fMAX

14 19 mA

PD Power Dissipation per

Output Pair[7] VCCN = VCCQ = Max

IOUT = 0 mA

Input Selects Open, fMAX

78 104[5] mW

Notes

4. These inputs are normally wired to VCC, GND, or left unconnected (actual threshold voltages vary as a percentage of VCC). Internal termination resistors hold

unconnected inputs at VCC/2. If these inputs are switched, the function and timing of the outputs may glitch and the PLL may require an additional tLOCK time

before all data sheet limits are achieved.

5. Tested one output at a time, output shorted for less than one second, less than 10% duty cycle. Room temperature only. CY7B9920 outputs are not short circuit

protected.

6. Total output current per output pair is approximated by the following expression that includes device current plus load current:

CY7B9910:

ICCN = [(4 + 0.11F) + [((835 – 3F)/Z) + (.0022FC)]N] x 1.1

CY7B9920:

ICCN = [(3.5+.17F) + [((1160 – 2.8F)/Z) + (.0025FC)]N] x 1.1

Where

F = frequency in MHz

C = capacitive load in pF

Z = line impedance in ohms

N = number of loaded outputs; 0, 1, or 2

FC = F < C.

7. Totalpowerdissipationperoutputpairis approximatedbythefollowingexpression thatincludesdevice powerdissipationpluspowerdissipationduetotheloadcircuit:

CY7B9910:

PD = [(22 + 0.61F) + [((1550 – 2.7F)/Z) + (.0125FC)]N] x 1.1

CY7B9920:

PD = [(19.25+ 0.94F) + [((700 + 6F)/Z) + (.017FC)]N] x 1.1.See note 3 for variable definition.

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 5 of 11

AC Test Loads and Waveforms

Capacitance

Tested initially and after any design or process changes that may affect these parameters.

Parameter Description Test Conditions Max Unit

CIN Input Capacitance TA= 25°C, f = 1 MHz, VCC = 5.0V 10 pF

7B9910–3 7B9910–4

TTL AC Test Load (CY7B9910) TTL Input Test Waveform (Cy7B9910)

7B9910–5

CMOS AC Test Load (CY7B9920)

3.0V

2.0V

Vth =1.5V

0.8V

0.0V

≤1ns ≤1ns

2.0V

0.8V

Vth =1.5V

80%

Vth =V

CC/2

20%

0.0V

≤ 3ns ≤3ns

80%

20%

Vth =V

CC/2

7B9910–6

CMOS Input Test Waveform (CY7B9920)

VCC

R1=130

R2=91

CL=50pF(C

L= 30pF for –5 and – 2 devices)

(Includes fixture and probe capacitance)

R1=100

R2=100

CL=50pF(C

L=30 pF for –5 and – 2devices)

(Includes fixture and probe capacitance)

VCC

Switching Characteristics

Over the Operating Range [11]

CY7B9910–2[8] CY7B9920–2[8]

Parameter Description Min Typ Max Min Typ Max Unit

fNOM Operating Clock

Frequency in MHz FS = LOW[1, 2] 15 30 15 30 MHz

FS = MID[1, 2] 25 50 25 50

FS = HIGH[1, 2, 3] 40 80 40 80[12]

tRPWH REF Pulse Width HIGH 5.0 5.0 ns

tRPWL REF Pulse Width LOW 5.0 5.0 ns

tSKEW Zero Output Skew (All Outputs)[13, 14] 0.1 0.25 0.1 0.25 ns

tDEV Device-to-Device Skew[14, 15] 0.75 0.75 ns

tPD Propagation Delay, REF Rise to FB Rise –0.25 0.0 +0.25 –0.25 0.0 +0.25 ns

tODCV Output Duty Cycle Variation[16] –0.65 0.0 +0.65 –0.65 0.0 +0.65 ns

tORISE Output Rise Time[17, 18] 0.15 1.0 1.2 0.5 2.0 2.5 ns

tOFALL Output Fall Time[17, 18] 0.15 1.0 1.2 0.5 2.0 2.5 ns

tLOCK PLL Lock Time[19] 0.5 0.5 ms

tJR Cycle-to-Cycle Output Jitter Peak to Peak 200 200 ps

RMS 25 25 ps

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 6 of 11

CY7B9910–5 CY7B9920–5

Parameter Description Min Typ Max Min Typ Max Unit

fNOM Operating Clock

Frequency in MHz FS = LOW[1, 2] 15 30 15 30 MHz

FS = MID[1, 2] 25 50 25 50

FS = HIGH[1, 2, 3] 40 80 40 80[12]

tRPWH REF Pulse Width HIGH 5.0 5.0 ns

tRPWL REF Pulse Width LOW 5.0 5.0 ns

tSKEW Zero Output Skew (All Outputs)[13, 14] 0.25 0.5 0.25 0.5 ns

tDEV Device-to-Device Skew[8,15] 1.0 1.0 ns

tPD Propagation Delay, REF Rise to FB Rise –0.5 0.0 +0.5 –0.5 0.0 +0.5 ns

tODCV Output Duty Cycle Variation[16] –1.0 0.0 +1.0 –1.0 0.0 +1.0 ns

tORISE Output Rise Time[17, 18 0.15 1.0 1.5 0.5 2.0 3.0 ns

tOFALL Output Fall Time[17, 18] 0.15 1.0 1.5 0.5 2.0 3.0 ns

tLOCK PLL Lock Time[19] 0.5 0.5 ms

tJR Cycle-to-Cycle Output Jitter Peak to Peak[8] 200 200 ps

RMS[8] 25 25 ps

Notes

8. Guaranteed by statistical correlation. Tested initially and after any design or process changes that may affect these parameters.

9. CMOS output buffer current and power dissipation specified at 50 MHz reference frequency.

10.Applies to REF and FB inputs only.

11. Test measurement levels for the CY7B9910 are TTL levels (1.5V to 1.5V). Test measurement levels for the CY7B9920 are CMOS levels (VCC/2 to VCC/2). Test

conditions assume signal transition times of 2ns or less and output loading as shown in the AC Test Loads and Waveforms unless otherwise specified.

12.Except as noted, all CY7B9920–2 and –5 timing parameters are specified to 80 MHz with a 30 pF load.

13.tSKEW is defined as the time between the earliest and the latest output transition among all outputs when all are loaded with 50 pF and terminated with 50Ωto

2.06V (CY7B9910) or VCC/2 (CY7B9920).

14.tSKEW is defined as the skew between outputs.

15.tDEV is the output-to-output skew between any two outputs on separate devices operating under the same conditions (VCC, ambient temperature, air flow, and

so on).

16.tODCV is the deviation of the output from a 50% duty cycle.

17.Specified with outputs loaded with 30 pF for the CY7B99X0–2 and –5 devices and 50 pF for the CY7B99X0–7 devices. Devices are terminated through 50Ωto

2.06V (CY7B9910) or VCC/2 (CY7B9920).

18.tORISE and tOFALL measured between 0.8V and 2.0V for the CY7B9910 or 0.8VCC and 0.2VCC for the CY7B9920.

19.tLOCK is the time that is required before synchronization is achieved. This specification is valid only after VCC is stable and within normal operating limits. This

parameter is measured from the application of a new signal or frequency at REF or FB until tPD is within specified limits.

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 7 of 11

Switching Characteristics

Over the Operating Range[11] (continued)

CY7B9910–7 CY7B9920–7

Parameter Description Min Typ Max Min Typ Max Unit

fNOM Operating Clock

Frequency in MHz FS = LOW[1, 2] 15 30 15 30 MHz

FS = MID[1, 2] 25 50 25 50

FS = HIGH1, 2, 3] 40 80 40 80[12]

tRPWH REF Pulse Width HIGH 5.0 5.0 ns

tRPWL REF Pulse Width LOW 5.0 5.0 ns

tSKEW Zero Output Skew (All Outputs)[13, 14] 0.3 0.75 0.3 0.75 ns

tDEV Device-to-Device Skew[8, 15] 1.5 1.5 ns

tPD Propagation Delay, REF Rise to FB Rise –0.7 0.0 +0.7 –0.7 0.0 +0.7 ns

tODCV Output Duty Cycle Variation[16] –1.2 0.0 +1.2 –1.2 0.0 +1.2 ns

tORISE Output Rise Time[17, 18] 0.15 1.5 2.5 0.5 3.0 5.0 ns

tOFALL Output Fall Time17, 18] 0.15 1.5 2.5 0.5 3.0 5.0 ns

tLOCK PLL Lock Time[19] 0.5 0.5 ms

tJR Cycle-to-Cycle Output

Jitter Peak to Peak[8] 200 200 ps

tJR RMS[8] 25 25 ps

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 8 of 11

AC Timing Diagrams

Figure 1. AC Timing Diagrams

Figure 2. Zero Skew and Zero Delay Clock Driver

tODCV

tREF

REF

OTHER Q

tRPWH

tRPWL

tPD

tSKEW tSKEW tJR

SYSTEM

CLOCK

REF

TEST

LOAD

REF

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 9 of 11

Operational Mode Descriptions

Figure 2 shows the device configured as a zero skew clock

buffer. In this mode the 7B9910/9920 is used as the basis for a

lowskew clock distribution tree. The outputsarealigned andmay

each drive a terminated transmission line to an independent

load. The FB input is tied to any output and the operating

frequency range is selected with the FS pin. The low skew speci-

fication, coupled with the ability to drive terminated transmission

lines (with impedances as low as 50 ohms), enables efficient

printed circuit board design.

Figure 1 shows the CY7B9910/9920 connected in series to

construct a zero skew clock distribution tree between boards.

Cascaded clock buffers accumulates low frequency jitter

because of the non-ideal filtering characteristics of the PLL filter.

Do not connect more than two clock buffers in series.

Figure 3. Board-to-Board Clock Distribution

SYSTEM

CLOCK

REF

TEST

REF

LOAD

TEST

[+] Feedback[+] Feedback

CY7B9910

CY7B9920

Document Number: 38-07135 Rev. *B Page 10 of 11

Ordering Information

Accuracy

(ps) Ordering Code Package Type Operating

Range

250 CY7B9910–2SC 24-Pb Small Outline IC Commercial

CY7B9910–2SCT 24-Pb Small Outline IC - Tape and Reel Commercial

CY7B9920–2SC[20] 24-Pb Small Outline IC Commercial

500 CY7B9910–5SC 24-Pb Small Outline IC Commercial

CY7B9910–5SCT 24-Pb Small Outline IC - Tape and Reel Commercial

CY7B9910–5SI 24-Pb Small Outline IC Industrial

CY7B9910–5SIT 24-Pb Small Outline IC - Tape and Reel Industrial

CY7B9920–5SC 24-Pb Small Outline IC Commercial

CY7B9920–5SCT 24-Pb Small Outline IC - Tape and Reel Commercial

CY7B9920–5SI 24-Pb Small Outline IC Industrial

750 CY7B9910–7SC 24-Pb Small Outline IC Commercial

CY7B9910–7SI[20] 24-Pb Small Outline IC Industrial

CY7B9920–7SC[20] 24-Pb Small Outline IC Commercial

CY7B9920–7SI[20] 24-Pb Small Outline IC Industrial

Pb-Free

250 CY7B9910–2SXC 24-Pb Small Outline IC Commercial

CY7B9910–2SXCT 24-Pb Small Outline IC - Tape and Reel Commercial

500 CY7B9910–5SXC 24-Pb Small Outline IC Commercial

CY7B9910–5SXCT 24-Pb Small Outline IC - Tape and Reel Commercial

CY7B9910–5SXI 24-Pb Small Outline IC Industrial

CY7B9910–5SXIT 24-Pb Small Outline IC - Tape and Reel Industrial

750 CY7B9910–7SXC 24-Pb Small Outline IC Commercial

CY7B9910–7SXCT 24-Pb Small Outline IC - Tape and Reel Commercial

Package Diagram

Figure 4. 24-Pin (300 Mil) Molded SOIC S13

51-85025-*C

Note

20.Not recommended for new design.

[+] Feedback[+] Feedback

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