X9221A Datasheet, PDF (11/15 Pages) Intersil Corporation – 64 Taps, 2-Wire Serial Bus

X9221A
A.C. CONDITIONS OF TEST
Input pulse levels
Input rise and fall times
Input and output timing levels
V_CC x 0.1 to V_CC x 0.9
10ns
V_CC x 0.5
SYMBOL TABLE
WAVEFORM INPUTS
OUTPUTS
Must be
steady
May change
from LOW
to HIGH
May change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
N/A
Will be
steady
Will change
from LOW
to HIGH
Will change
from HIGH
to LOW
Changing:
State Not
Known
Center Line
is High
Impedance
Equivalent A.C. Test Circuit
5V
1533Ω
SDA Output
100pF
Circuit #3 SPICE Macro Model
Macro Model
R_TOTAL
R_H
R_L
C_H
C_L
10pF
C_W ^10pF
25pF
R_W
Guidelines for Calculating Typical Values of Bus
Pull-Up Resistors
120
100
R_MIN
=
V_{CC MAX}
I_{OL MIN}
=1.8kΩ
80
R_MAX
= ^tR
C_BUS
60
Max.
Resistance
40
20 _Min.
Resistance
0
0 ^{20 40 60}
80 ₁₀₀ 120
Bus Capacitance (pF)
11
FN8163.1
September 14, 2005