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FS6159-01

Auxiliary Motherboard Clock Generator/Buffer IC

AMI Semiconductor 

FS6159-01

Auxiliary Motherboard Clock Generator/Buffer IC

Table 19: Serial Interface Timing Specifications

Unless otherwise stated, all power supplies = 3.3V ± 5%, no load on any output, and ambient temperature range TA = 0°C to 70°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 from typical.

PARAMETER

SYMBOL

CONDITIONS/DESCRIPTION

STANDARD MODE

MIN.

MAX.

UNITS

Clock frequency

fSCL

SCL

0

100

kHz

Bus free time between STOP and START

tBUF

4.7

µs

Set up time, START (repeated)

tsu:STA

4.7

µs

Hold time, START

thd:STA

4.0

µs

Set up time, data input

tsu:DAT

SDA

250

ns

Hold time, data input

thd:DAT

SDA

0

µs

Output data valid from clock

tAA

Minimum delay to bridge undefined region of the fall-

ing edge of SCL to avoid unintended START or STOP

3.5

µs

Rise time, data and clock

tR

SDA, SCL

1000

ns

Fall time, data and clock

tF

SDA, SCL

300

ns

High time, clock

tHI

SCL

4.0

µs

Low time, clock

tLO

SCL

4.7

µs

Set up time, STOP

tsu:STO

4.0

µs

Figure 7: Bus Timing Data

SCL

SDA

tsu:STA

thd:STA

START

ADDRESS OR

DATA VALID

DATA CAN

CHANGE

Figure 8: Data Transfer Sequence

SCL

tF

tLO

tsu:STA

thd:STA

SDA

IN

tAA

SDA

OUT

tHI

thd:DAT

tAA

tsu:DAT

tsu:STO

STOP

tR

tsu:STO

tBUF

ISO9001

2.27.02

11

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