Datasheet

MAX4899E/MAX4899AE
USB 2.0 High-Speed, Fault-Tolerant 3:1, 4:1
Multiplexers
______________________________________________________________________________________ 11
ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
The COM
A
+ and COM
A
- lines have extra protection
against static electricity. Maxim’s engineers have devel-
oped state-of-the-art structures to protect these pins
against ESD of ±15kV without damage. The ESD struc-
tures withstand high ESD in all states: normal operation,
tri-state output mode, and powered down. After an ESD
event, Maxim’s E-versions keep working without latch-
up, whereas competing products can latch and must be
powered down to remove latch-up.
Human Body Model
The MAX4899E/MAX4899AE COM
A
+ and COM
A
- pins
are characterized for ±15kV ESD protection using the
Human Body Model (MIL-STD-883, Method 3015).
Figure 9a shows the Human Body Model and Figure 9b
shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the device through a
1.5kΩ resistor.
COM
A
+
COM
A
-
USB0+
USB0-
USB2-
USB2+
USB1-
USB1+
USB3+ USB3-
USB
CONNECTOR
V
BUS
D+
D-
GND
USB
TRANSCEIVER
AUDIO
HEADPHONE
AUXILIARY
INPUT
SERIAL DATA LINK
MAX4899AE
Figure 8. MAX4899AE Multiplexing Four Data Types
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
100pF
R
C
1MΩ R
D
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 9a. Human Body ESD Test Model
I
P
100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPERES
Figure 9b. Human Body Model Current Waveform
Chip Information
PROCESS: BiCMOS