97CFDC Datasheet, PDF (17/20 Pages) SMSC Corporation – USB FLOPPY DISK CONTROLLER

Table 2 - Full Speed (12Mbps) Source Electrical Characteristics
CONDITIONS
PARAMETER
SYM
(NOTE 1, 2, 3)
MIN TYP
MAX
Driver Characteristics
Transition Time:
Note 4,5 and
FIGURE 7
Rise Time
TR
CL = 50 pF
4
20
Fall Time
Rise/Fall Time Matching
Output Signal
Crossover Voltage
Drive Output
Resistance
Data Source Timing
Full Speed Data Rate
Frame Interval
Source Differential
Driver Jitter
To next Transition
For Paired Transitions
Source EOP Width
Differential to EOP
transition Skew
Receiver Data Jitter
Tolerance
TF
TRFM
VCRS
ZDRV
TDRATE
TFRAME
TDJ1
TDJ2
TEOPT
TDEOP
CL = 50 pF
(TR/TF)
Steady State Drive
Ave. Bit Rate
(12 Mb/s +/-
0.25%) Note 8
1.0 ms +/- 0.05%
Note 6, 7 and
FIGURE 8
Note 7 and
FIGURE 9
Note 7 and
FIGURE 9
Note 7 and
FIGURE 10
4
90
1.3
28
11.95
0.999
5
-3.5
-4.0
160
-2
20
110
2.0
43
12.03
1.0005
3.5
4.0
175
5
To next Transition
For Paired Transitions
EOP Width at receiver
TJR1
TJR2
Must reject as EOP
Must Accept
TEOPR1
TEOPR2
Cable Impedance and Timing
Cable Impedance (Full
ZO
Speed)
Cable Delay (One Way) TCBL
Note 7 and
FIGURE 9
(45 Ω +/- 15%)
-18.5
-9
40
82
38.75
18.5
9.0
51.75
30
Note 1: All voltages are measured from the local ground potential, unless otherwise specified.
Note 2: All timing use a capacitive load (CL) to ground of 50pF, unless otherwise specified.
Note 3: Full speed timings have a 1.5KΩ pull-up to 2.8 V on the D+ data line.
Note 4: Measured from 10% to 90% of the data signals.
Note 5: The rising and falling edges should be smoothly transiting (monotonic).
Note 6: Timing differences between the differential data signals.
Note 7: Measured at crossover point of differential data signals.
Note 8: These are relative to the 14.318 MHz crystal.
UNIT
ns
ns
%
V
Ω
Mbs
ms
ns
ns
ns
ns
ns
ns
ns
ns
Ω
ns
SMSC DS – USB97CFDC
Page 17
Rev. 12/15/2000