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FS6232-01

Two-Way MP Motherboard Clock Generator IC

AMI Semiconductor 

AMERICAN MICROSYSTEMS, INC.

FS6232-01

Two-Way MP Motherboard Clock Generator IC

September 2000

Table 14: AC Timing Specifications

Unless otherwise stated, all power supplies = 3.3V, no load on any output, and ambient temperature TA = 25°C. Parameters denoted with an asterisk ( * ) represent nominal characterization data and

are not currently production tested to any specific limits. MIN and MAX characterization data are ± 3σ f rom typical. Spread spectrum modulation is disabled except for Rise/Fall time measurements.

PARAMETER

SYMBOL

CONDITIONS/DESCRIPTION

MIN.

TYP. MAX. UNITS

Overall

Spread Spectrum Modulation

Frequency *

Spread Spectrum Modulation

Index *

fm

SS_EN# low

δm

SS_EN# low

Clock Offset

tpd

CK66 leads @ 1.5V, CL=30pF to PCI @ 1.5V,

CL = 30pF (measured on rising edges)

1.5

Output Tristate Enable Delay *

tDZL, tDZH SEL_A:B = 00, SEL133/100# = 0

1.0

Output Tristate Disable Delay *

tDLZ, tDHZ SEL_A:B = 11, SEL133/100# = 0

1.0

Power-up PLL Lock Time

tL

via PWR_DWN#

HOST_P1:4, HOST_N1:4 Clock Outputs

Clock Skew *

Duty Cycle *

Jitter, Period (peak-peak) *

Rise Time *

Rise/Fall Time Matching*

tsk(o)

HOST pair to HOST pair @ VX, RIREF = 475Ω,

IOH = 6 × IREF, RS = 33.2Ω, RP = 49.9Ω

dt

Ratio of high pulse width to one clock period at VX,

RIREF = 475Ω, IOH = 6 × IREF, RS=33.2Ω, RP=49.9Ω

45

tj(∆P)

Rising edge to rising edge at VX, RIREF = 475Ω,

IOH = 6 × IREF RS = 33.2Ω, RP = 49.9Ω

tr

Measured at 20% – 80% of VOH; RIREF = 475Ω,

IOH = 6 × IREF RS = 33.2Ω, RP = 49.9Ω

175

Measured at 20% – 80% of VOH; RIREF = 475Ω,

IOH = 6 × IREF RS = 33.2Ω, RP = 49.9Ω

MREF_P, MREF_N Clock Outputs

Duty Cycle *

Jitter, Period (peak-peak) *

Rise Time *

Fall Time *

dt

Ratio of high pulse width to one clock period,

measured at 1.5V

45

tj(∆P)

From rising edge to rising edge at 1.5V, CL=30pF

tr min

Measured @ 0.4V – 2.4V; CL=10pF

0.4

tr max

Measured @ 0.4V – 2.4V; CL=30pF

tf min

Measured @ 2.4V – 0.4V; CL=10pF

0.4

tf max

Measured @ 2.4V – 0.4V; CL=30pF

31.5

kHz

-0.5

%

3.5

ns

10

ns

10

ns

3.0

ms

150

ps

55

%

200

ps

450

ps

20

%

55

%

250

ps

ns

1.6

ns

1.6

ISO9001

9

9.18.00

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