Cypress Semiconductor Z9973 Manuel utilisateur

3.3V,125-MHz,Multi-OutputZeroDelayBuffer

Z9973

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

Document #: 38-07089 Rev. *D Revised December 21, 2002

Features

• Output frequency up to 125 MHz

• 12 clock outputs: frequency configurable

• 350 ps max output-to-output skew

• Configurable output disable

• Two reference clock inputs for dynamic toggling

• Oscillator or PECL reference input

• Spread spectrum-compatible

• Glitch-free output clocks transitioning

• 3.3V power supply

• Pin-compatible with MPC973

• Industrial temperature range: –40°C to +85°C

• 52-pin TQFP package

Note:

1. x = the reference input frequency, 200 MHz < FVCO < 480 MHz.

Table 1. Frequency Table[1]

VC0_SEL FB_SEL2 FB_SEL1 FB_SEL0 FVC0

00008x

000112x

001016x

001120x

010016x

010124x

011032x

011140x

10004x

10016x

10108x

101110x

11008x

110112x

111016x

111120x

Block Diagram Pin Configuration

REF_SEL

Phase

Detector VCO

LPF

Sync

Frz

DQQA0

Sync

Frz

Sync

Frz

Sync

Frz

Sync

Frz

Sync

Frz

Power-On

Reset

Output Disable

Circuitry

Data Generator

/4, /6, /8, /12

/4, /6, /8, /10

/2, /4, /6, /8

/4, /6, /8, /10

Sync Pulse

PECL_CLK

PECL_CLK#

TCLK0

TCLK1

TCLK_SEL

FB_IN

FB_SEL2

MR#/OE

SELA(0,1) 2

SELB(0,1) 2

SELC(0,1) 2

FB_SEL(0,1) 2

SCLK

SDATA

INV_CLK

QA1

QA2

QA3

QB0

QB1

QB2

QB3

QC0

QC1

QC2

QC3

FB_OUT

SYNC

VCO_SEL

PLL_EN

VSS

MR#/OE

SCLK

SDATA

FB_SEL2

PLL_EN

REF_SEL

TCLK_SEL

TCLK0

TCLK1

PECL_CLK

PECL_CLK#

VDD

FB_SEL1

SYNC

VSS

QC0

VDDC

QC1

SELC0

SELC1

QC2

VDDC

QC3

VSS

INV_CLK

SELB1

SELB0

SELA1

SELA0

QA3

VDDC

QA2

VSS

QA1

VDDC

QA0

VSS

VCO_SEL

VSS

QB0

VDDC

QB1

VSS

QB2

VDDC

QB3

FB_IN

VSS

FB_OUT

VDDC

FB_SEL0

14 15 16 17 18 19 20 21 22 23 24 25 26

52 51 50 49 48 47 46 45 44 43 42 41 40

Z9973

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Z9973

Document #: 38-07089 Rev. *D Page 2 of 9

Pin Description [2]

Pin Number Pin Name PWR I/O Type Pin Description

11 PECL_CLK I PU PECL Clock Input.

12 PECL_CLK# I PD PECL Clock Input.

9TCLK0 IPUExternal Reference/Test Clock Input.

10 TCLK1 I PU External Reference/Test Clock Input.

44, 46, 48, 50 QA(3:0) VDDC O Clock Outputs. See Table 2 for frequency selections.

32, 34, 36, 38 QB(3:0) VDDC O Clock Outputs. See Table 2 for frequency selections.

16, 18, 21, 23 QC(3:0) VDDC O Clock Outputs. See Table 2 for frequency selections.

29 FB_OUT VDDC O Feedback Clock Output. Connect to FB_IN for normal operation. The

divider ratio for this output is set by FB_SEL(0:2). See Table 1. A bypass

delay capacitor at this output will control Input Reference/ Output Banks

phase relationships.

25 SYNC VDDC O Synchronous Pulse Output. This output is used for system synchroni-

zation. The rising edge of the output pulse is in sync with both the rising

edgesofQA(0:3)andQC(0:3)outputclocksregardlessofthedividerratios

selected.

42, 43 SELA(1,0) I PU Frequency Select Inputs. These inputs select the divider ratio at QA(0:3)

outputs. See Table 2.

40, 41 SELB(1,0) I PU Frequency Select Inputs. These inputs select the divider ratio at QB(0:3)

outputs. See Table 2.

19, 20 SELC(1,0) I PU Frequency Select Inputs. These inputs select the divider ratio at QC(0:3)

outputs. See Table 2.

5, 26, 27 FB_SEL(2:0) I PU Feedback Select Inputs. These inputs select the divide ratio at FB_OUT

output. See Table 1.

52 VCO_SEL I PU VCO Divider Select Input. When set LOW, the VCO output is divided by

2. When set HIGH, the divider is bypassed. See Table 1.

31 FB_IN I PU Feedback Clock Input. Connect to FB_OUT for accessing the

phase-locked loop (PLL).

6 PLL_EN I PU PLL Enable Input. When asserted HIGH, PLL is enabled. And when LOW,

PLL is bypassed.

7 REF_SEL I PU ReferenceSelectInput.WhenHIGH,thecrystaloscillatorisselected.And

when LOW, TCLK (0,1) is the reference clock.

8 TCLK_SEL I PU TCLKSelectInput.WhenLOW,TCLK0isselectedandwhenHIGHTCLK1

is selected.

2MR#/OE IPUMaster Reset/Output Enable Input.When assertedLOW, resetsallof the

internal flip-flops and also disables all of the outputs. When pulled HIGH,

releases the internal flip-flops from reset and enables all of the outputs.

14 INV_CLK I PU InvertedClockInput.WhensetHIGH,QC(2,3)outputsareinverted.When

set LOW, the inverter is bypassed.

3SCLK IPUSerial Clock Input. Clocks data at SDATA into the internal register.

4SDATA IPUSerial Data Input. Input data is clocked to the internal register to

enable/disable individual outputs. This provides flexibility in power

management.

17, 22, 28,

33,37, 45, 49 VDDC 3.3V Power Supply for Output Clock Buffers.

13 VDD 3.3V Supply for PLL.

1, 15, 24, 30,

35, 39, 47, 51 VSS Common Ground.

Note:

2. A bypass capacitor (0.1 µF) should be placed as close as possible to each positive power (< 0.2”). If these bypass capacitors are not close to the pins, their

high-frequency filtering characteristics will be cancelled by the lead inductance of the traces.

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Z9973

Document #: 38-07089 Rev. *D Page 3 of 9

Functional Description

The Z9973 has an integrated PLL that provides low-skew and

low-jitter clock outputs for high-performance microprocessors.

Three independent banks of four outputs as well as an

independent PLL feedback output, FB_OUT, provide excep-

tional flexibility for possible output configurations. The PLL is

ensured stable operation given that the VCO is configured to

run between 200 MHz to 480 MHz. This allows a wide range

of output frequencies up to125 MHz.

The phase detector compares the input reference clock to the

external feedback input. For normal operation, the external

feedback input, FB_IN, is connected to the feedback output,

FB_OUT. The internal VCO is running at multiples of the input

reference clock set by FB_SEL(0:2) and VCO_SEL select

inputs (see Table 1). The VCO frequency is then divided to

provide the required output frequencies. These dividers are

set by SELA(0,1), SELB(0,1), SELC(0,1) select inputs (see

Table 2). For situations in which the VCO needs to run at

relatively low frequencies and hence might not be stable,

assert VCO_SEL LOW to divide the VCO frequency by 2. This

will maintain the desired output relationships, but will provide

an enhanced PLL lock range.

The Z9973 is also capable of providing inverted output clocks.

When INV_CLK is asserted HIGH, QC2 and QC3 output

clocks are inverted. These clocks could be used as feedback

outputs to the Z9973 or a second PLL device to generate early

or late clocks for a specific design. This inversion does not

affect the output to output skew.

Zero Delay Buffer

When used as a zero delay buffer, the Z9973 will likely be in a

nested clock tree application. For these applications the

Z9973 offers a low-voltage PECL clock input as a PLL

reference. This allows the user to use LVPECL as the primary

clock distribution device to take advantage of its far superior

skew performance. The Z9973can thenlock ontothe LVPECL

reference and translate with near-zero delay to low-skew

outputs.

By using one of the outputs as a feedback to the PLL, the

propagation delay through the device is eliminated. The PLL

works to align the output edge with the input reference edge

thus producing near-zero delay. The reference frequency

affects the static phase offset of the PLL and thus the relative

delay between inputs and outputs. Because the static phase

offset is a function of the reference clock, the Tpd of the Z9973

is a function of the configuration used.

Glitch-Free Output Frequency Transitions

Customarily, when output buffers have their internal counters

changed “on the fly,”their output clock periods will:

1. containshortor“runt”clockperiods.Theseareclockcycles

in which the cycle(s) are shorter in period than either the

old or new frequency to which it is being transitioned.

2. contain stretched clock periods. These are clock cycles in

which the cycle(s) are longer in period than either the old

or new frequency to which it is being transitioned.

This device specifically includes logic to guarantee that runt

and stretched clock pulses do not occur if the device logic

levels of any or all of the following pins changed “on the fly”

while it is operating: SELA, SELB, SELC, and VCO_SEL.

SYNC Output

In situations where output frequency relationships are not

integer multiples of each other, the SYNC output provides a

signal for system synchronization. The Z9973 monitors the

relationship between the QA and the QC output clocks. It

provides a low-going pulse, one period in duration, one period

prior to the coincident rising edges of the QA and QC outputs.

The duration and the placement of the pulse depend on the

higher of the QA and QC output frequencies. The following

timing diagram illustrates various waveforms for the SYNC

output (see Figure 1). Note. The SYNC output is defined for

all possible combinations of the QA and QC outputs even

though under some relationships the lower frequency clock

could be used as a synchronizing signal.

Table 2. Frequency Select Inputs

VCO_SEL SELA1 SELA0 QA SELB1 SELB0 QB SELC1 SELC0 QC

0 0 0VCO/80 0VCO/80 0VCO/4

0 0 1VCO/120 1VCO/120 1 VCO/8

0 1 0VCO/161 0VCO/161 0VCO/12

0 1 1VCO/241 1VCO/201 1VCO/16

1 0 0VCO/40 0VCO/40 0VCO/2

1 0 1VCO/60 1VCO/60 1VCO/4

1 1 0VCO/81 0VCO/81 0VCO/6

1 1 1VCO/121 1VCO/101 1 VCO/8

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Z9973

Document #: 38-07089 Rev. *D Page 4 of 9

SYNC

VCO

1:1 Mode

2:1 Mode

3:1 Mode

3:2 Mode

4:1 Mode

4:3 Mode

6:1 Mode

Figure 1. Sync Output Waveforms

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Z9973

Document #: 38-07089 Rev. *D Page 5 of 9

Power Management

The individual output enable/freeze control of the Z9973

allows the user to implement unique power management

schemes into the design. The outputs are stopped in the logic

“0”state when the freeze control bits are activated. The serial

input register containsone programmable freeze enable bit for

12 of the 14 output clocks. The QC0 and FB_OUT outputs

cannot be frozen with the serial port, which avoids any

potential lock-up situation should an error occur in loading the

serialdata. Anoutputis frozen when a logic “0”is programmed

and enabled when a logic “1”is written. The enabling and

freezing of individual outputs is done in such a manner as to

eliminate the possibility of partial “runt”clocks.

The serial input register is programmed through the SDATA

input by writing a logic “0”start bit followed by 12 NRZ freeze

enable bits (see Figure 2). The period of each SDATA bit

equals the period of the free-running SCLK signal. The SDATA

is sampled on the rising edge of SCLK.

D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11

D0-D3 are the control bits for QA0-QA3, respectively

D4-D7 are the control bits for QB0-QB3, respectively

D8-D10 are the control bits for QC1-QC3, respectively

D11 is the control bit for SYNC

Start

Bit

Figure 2. SDATA Input Register

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Z9973

Document #: 38-07089 Rev. *D Page 6 of 9

Maximum Ratings[3]

Maximum Input Voltage Relative to VSS:............ VSS –0.3V

Maximum Input Voltage Relative to VDD:.............VDD + 0.3V

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

Operating Temperature:................................–40°C to +85°C

Maximum ESD protection...............................................2 kV

Maximum Power Supply:................................................5.5V

Maximum Input Current:..................................................±20 mA

This device contains circuitry to protect the inputs against

damage due to high static voltages or electric field; however,

precautions should be taken to avoid application of any

voltage higher than the maximum rated voltages to this circuit.

For proper operation, VIN and VOUT should be constrained to

the range:

VSS < (VIN or VOUT) < VDD .

Unused inputs must always be tied to an appropriate logic

voltage level (either VSS or VDD).

DC Parameters (VDD = 2.9V to 3.6V, VDDC = 3.3V ±10%, TA= –40°C to +85°C)

Parameter Description Conditions Min. Typ. Max. Unit

VIL Input LOW Voltage VSS 0.8 V

VIH Input HIGH Voltage 2.0 VDD V

VPP Peak-to-Peak Input Voltage

PECL_CLK 300 1000 mV

VCMR CommonMode Range PECL_CLK[9] VDD –2.0 VDD –0.6 V

IIL Input Low Current[10] –120 µA

IIH Input High Current[10] 120 µA

VOL Output Low Voltage[11] IOL = 20 mA 0.5 V

VOH Output High Voltage[11] IOH = –20 mA 2.4 V

IDDQ Quiescent Supply Current 10 15 mA

IDDA PLL Supply Current VDD only 15 20 mA

IDD Dynamic Supply Current QA and QB @ 60 MHz,

QC @ 120 MHz, CL= 30 pF 225 mA

QA and QB @ 25 MHz,

QC @ 50 MHz, CL= 30 pF 125

CIN Input Pin Capacitance 4 pF

AC Parameters (VDD = 2.9V to 3.6V, VDDC = 3.3V ±10%, TA= –40°C to +85°C) [4]

Parameter Description Conditions Min. Typ. Max. Units

Tr / Tf TCLK Input Rise / Fall 3.0 ns

Fref Reference Input Frequency Note 5 Note 5 MHz

FrefDC Reference Input Duty Cycle 25 75 %

Fvco PLL VCO Lock Range 200 480 MHz

Tlock Maximum PLL Lock Time 10 ms

Tr / Tf Output Clocks Rise/Fall Time[6] 0.8V to 2.0V 0.15 1.2 ns

Notes:

3. The voltage on any input or I/O pic cannot exceed the power pin during power-up. Power supply sequencing is NOT required.

4. Parameters are guaranteed by design and characterization. Not 100% tested in production.

5. Maximum and minimum input reference is limited by VC0 lock range.

6. Outputs loaded with 30 pF each.

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Z9973

Document #: 38-07089 Rev. *D Page 7 of 9

Notes:

7. 50Ωtransmission line terminated into VDD/2.

8. Tpd is specified for a 50-MHz input reference. Tpd does not include jitter.

9. The VCMR is the difference from the most positive side of the differential input signal. Normal operation is obtained when the “High”input is within the VCMR

range and the input lies within the VPP specification.

10. Inputs have pull-up/pull-down resistors that effect input current.

11. Driving series or parallel terminated 50Ω(or 50Ωto VDD/2) transmission lines.

Fout Maximum Output Frequency Q (÷2) 125 MHz

Q (÷4) 120

Q (÷6) 80

Q (÷8) 60

FoutDC Output Duty Cycle[6] TCYCLE

/2 –750 TCYCLE

/2 + 750 ps

tpZL, tpZH Output Enable Time[6](all outputs) 2 10 ns

tpLZ, tpHZ Output Disable Time[6](all outputs) 2 8 ns

TCCJ Cycle to Cycle Jitter(peak to peak)[6] ± 100 ps

TSKEW Any Output to Any Output Skew[6,7] 250 350 ps

Propagation Delay[7,8] –225 –25 175 ps

Tpd QFB = (÷8) –70 130 330

–130 70 270

Ordering Information

Part Number Package Type Production Flow

IMIZ9973BA 52-pin TQFP Industrial, –40°C to +85°C

IMIZ9973BAT 52-pin TQFP–Tape and Reel Industrial, –40°C to +85°C

AC Parameters (VDD = 2.9V to 3.6V, VDDC = 3.3V ±10%, TA= –40°C to +85°C) (Continued)[4]

Parameter Description Conditions Min. Typ. Max. Units

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Z9973

Document #: 38-07089 Rev. *D Page 8 of 9

of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nordoes it convey or implyany license under patent or otherrights. Cypress Semiconductor 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

Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doi

ng so indemnifies Cypress Semiconductor against all charges.

Package Drawing and Dimensions

All product and company names mentioned in this document are the trademarks of their respective holders.

52-lead Thin Plastic Quad Flat Pack (10 ×10 ×1.4 mm) A52

51-85131-**

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Z9973

Document #: 38-07089 Rev. *D Page 9 of 9

Document Title: Z9973 3.3V, 125 MHz Multi-Output Zero Delay Buffer

Document Number: 38-07089

Rev. ECN No. Issue Date Orig. of

Change Description of Change

** 107125 06/06/01 IKA Convert from IMI to Cypress

*A 108067 07/03/01 NDP Changed Commercial to Industrial

*B 111799 02/06/02 BRK Convert from Word Doc to Adobe Framemaker Cypress Format

Changed the Timing Diagram and the operating voltage condition

*C 116452 07/30/02 HWT Corrected the Ordering Information to match the DevMaster.

*D 122774 12/21/02 RBI Add power up requirements to maximum ratings information.

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