CDCR83

DIRECT RAMBUS CLOCK GENERATOR

SCAS632B − APRIL 2001 − REVISED OCTOBER 2005

7

POST OFFICE BOX 655303

switching characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

UNIT

tc(out)

Clock output cycle time

2.5

3.75

ns

Total cycle jitter over 1, 2,

Infinite and

267 MHz

80

t(jitter)

Total cycle jitter over 1, 2,

3, 4, 5, or 6 clock cycles

Infinite and

stopped phase

300 MHz

See Figure 3

70

ps

t(jitter)

3, 4, 5, or 6 clock cycles

stopped phase

alignment

356 MHz

See Figure 3

60

ps

alignment

400 MHz

50

t(phase)

Phase detector phase error for distributed loop

Static phase error}

−100

100

ps

t(phase, SSC)

PLL output phase error when tracking SSC

Dynamic phase error}

−100

100

ps

t(DC)

Output duty cycle over 10,000 cycles

See Figure 4

45%

55%

Infinite and

267 MHz

80

t(DC, err)

Output cycle-to-cycle

Infinite and

stopped phase

300 MHz

See Figure 5

70

ps

t(DC, err)

Output cycle-to-cycle

duty cycle error

stopped phase

alignment

356 MHz

See Figure 5

60

ps

duty cycle error

alignment

400 MHz

50

tr, tf

Output rise and fall times (measured at 20%−80% of

output voltage)

See Figure 7

160

400

ps

∆t

Difference between rise and fall times on a single device

(20%−80%) |tf − tr|

See Figure 7

100

ps

† All typical values are at VDD = 3.3 V, TA = 25°C.

‡ Assured by design

state transition latency specifications

PARAMETER

FROM

TO

TEST

CONDITIONS

MIN

TYP†

MAX

UNIT

t(powerup)

Delay time, PWRDNB

↑ to CLK/CLKB output

settled (excluding t(DISTLOCK))

Powerdown

Normal

See Figure 8

3

ms

t(powerup)

Delay time, PWRDNB

↑ to internal PLL and

clock are on and settled

Powerdown

Normal

3

ms

Delay time, power up to CLK/CLKB output

settled

VDD

Normal

See Figure 8

3

ms

Delay time, power up to internal PLL and

clock are on and settled

VDD

Normal

3

ms

t(MULT)

MULT0 and MULT1 change to CLK/CLKB

output resettled (excluding t(DISTLOCK))

Normal

Normal

See Figure 9

1

ms

t(CLKON)

STOPB

↑ to CLK/CLKB glitch-free clock

edges

CLK Stop

Normal

See Figure 10

10

ns

t(CLKSETL)

STOPB

↑ to CLK/CLKB output settled to

within 50 ps of the phase before STOPB was

disabled

CLK Stop

Normal

See Figure 10

20

cycles

t(CLKOFF)

STOPB

↓ to CLK/CLKB output disabled

Normal

CLK

Stop

See Figure 10

5

ns

† All typical values are at VDD = 3.3 V, TA = 25°C.