FS6232-01 datasheet(9/14 Pages) ETC

9 / 14 page

AMERICAN MICROSYSTEMS, INC.

September 2000

9.18.00

FS6232-01

Two-Way MP Motherboard Clock Generator IC

ISO9001

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

± 3σfrom 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 *

SS_EN# low

31.5

kHz

Spread Spectrum Modulation

Index *

δm

SS_EN# low

-0.5

Clock Offset

tpd

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

CL = 30pF (measured on rising edges)

1.5

3.5

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

via PWR_DWN#

3.0

HOST_P1:4, HOST_N1:4 Clock Outputs

Clock Skew *

tsk(o)

HOST pair to HOST pair @ VX, RIREF = 475

Ω,

IOH = 6

× IREF, RS = 33.2Ω, RP = 49.9Ω

150

Duty Cycle *

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

RIREF = 475

Ω, IOH = 6 × IREF, RS=33.2Ω, RP=49.9Ω

Jitter, Period (peak-peak) *

tj(∆P)

Rising edge to rising edge at VX, RIREF = 475

Ω,

IOH = 6

× IREF RS = 33.2Ω, RP = 49.9Ω

200

Rise Time *

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

Ω,

IOH = 6

× IREF RS = 33.2Ω, RP = 49.9Ω

175

450

Rise/Fall Time Matching*

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

Ω,

IOH = 6

× IREF RS = 33.2Ω, RP = 49.9Ω

MREF_P, MREF_N Clock Outputs

Duty Cycle *

Ratio of high pulse width to one clock period,

measured at 1.5V

Jitter, Period (peak-peak) *

tj(∆P)

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

250

tr min

Measured @ 0.4V – 2.4V; CL=10pF

0.4

Rise Time *

tr max

Measured @ 0.4V – 2.4V; CL=30pF

1.6

tf min

Measured @ 2.4V – 0.4V; CL=10pF

0.4

Fall Time *

tf max

Measured @ 2.4V – 0.4V; CL=30pF

1.6

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