Rainbow Electronics MAX3345E - Manual (Page 12)

MAX3344E/MAX3345E
±15kV ESD-Protected USB Transceivers
in UCSP with USB Detect
12 ______________________________________________________________________________________
t PHL(RCV) t PLH(RCV)
t PHL(SE) t PLH(SE)
t PLH(SE) t PHL(SE)
D+
D-
RCV
VPI
VMI
D+/D- RISE/FALL TIMES ≤ 8ns, V
L
= 1.65V, 2.5V, 3.3V
3V
0V
V L
V L /2
V L /2
V L /2
0V
V
L
0V
V L
0V
Figure 5. D+/D- to RCV, VPI, VMI Propagation Delays
(c) LOAD FOR ENABLE AND DISABLE TIME, D+/D-
(a) LOAD FOR VPI, VMI, AND RCV
VMI OR VPI OR RCV
MAX3344E
MAX3345E
25pF
TEST POINT
D+ OR D-
200Ω 23.7Ω
MAX3344E
MAX3345E
50pF GND
OR V
CC
+
-
TEST POINT
D+
D-
USB_DET
23.7Ω
C L = 50pF
C L = 50pF
15kΩ
1.5kΩ
3.3V
MAX3344E
MAX3345E
TEST POINT
(b) LOAD FOR D+, D-, AND USB_DET
23.7Ω
15kΩ
TEST POINT
25pF
Figure 6. Test Circuits