Datasheet

MAX14978
SuperSpeed USB Passive Switch
(Low/Full/Hi/SuperSpeed)
6
Test Circuits/Timing Diagrams
Figure 1. Off-Isolation, On-Loss, and Crosstalk
Figure 2. Switching Time
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED BETWEEN ANY TWO PAIRS.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
V
DD
V
OUT
V
DD
SEL_
NC_
COM_
NO_
V
IN
V
CC
V
CC
OFF-ISOLATION = 20log
V
OUT
V
IN
ON-LOSS = 20log
V
OUT
V
IN
CROSSTALK = 20log
V
OUT
V
IN
NETWORK
ANALYZER
50Ω
50Ω 50Ω
50Ω
MEAS REF
0.1
µ
F0.1
µ
F
0V OR V
DD
50Ω
GND
MAX14978
t
r
< 5ns
t
f
< 5ns
50%
V
IL
LOGIC
INPUT
V
N_
= V
NO_
OR V
NC_
R
L
COM_
GND
SEL_
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
V
N_
V
IH
t
OFF
0V
NO_
OR NC_
0.9 x V
0UT
0.9 x V
OUT
t
ON
V
OUT
SWITCH
OUTPUT
LOGIC
INPUT
C
L
V
OUT
= V
N_
( )
R
L
R
L
+ R
ON
V
OUT
MAX14978
V
CC
V
CC
V
DD
V
DD
0.1
µ
F0.1
µ
F