MAX4999
USB 2.0 Hi-Speed Differential
8:1 Multiplexer
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Detailed Description
The MAX4999 differential Hi-Speed USB analog multi-
plexer features low on-capacitance (C
ON
) and low on-
resistance (R
ON
) necessary for high-performance
switching applications. The low C
ON
is designed for
USB server/mass storage devices. This device is ideal
for USB 2.0 Hi-Speed applications at 480Mbps, while
also meeting the requirements for USB low-/full-speed
applications.
Digital Control Inputs (C0, C1, C2)
The MAX4999 provides three digital control inputs (C0,
C1, C2) to select the analog signal path between the
COM_ and D-/D+ channels. The truth table for the
MAX4999 is shown in the
Functional Diagram/Truth
Table.
Driving the control inputs rail-to-rail minimizes
power consumption.
Enable Input (EN)
The MAX4999 features an enable input that when driven
low, places the device in standby mode. In standby
mode, all channels are high impedance and the internal
charge pump is disabled, thus minimizing the quiescent
supply current. For normal operation, drive EN high.
Analog Signal Levels
Signals applied to COM1 are routed to D_ _1 terminals.
Signals applied to COM0 are routed to D_ _0 terminals.
This multiplexer is bidirectional, allowing COM_ and
D-/D+ terminals to be configured as either inputs or
outputs. Additionally, the MAX4999 can be used for
non-USB signals if the signals fall within the normal
operating range.
The MAX4999 features an internal charge pump that
allows signal levels greater than the supply voltage.
Limit the analog input/output signal level to no more
than the
Absolute Maximum Ratings
.
Pin Description
PIN NAME FUNCTION
1, 11, 14, 17,
21, 24, 27, 30
GND Ground
2, 20 V
CC
Power-Supply Input. Bypass V
CC
to GND with a 0.1µF capacitor placed as close to V
CC
as possible.
3 EN Enable Input
4 COM0 Analog Switch Common D- Terminal
5 COM1 Analog Switch Common D+ Terminal
6 C0 Control Input 0
7 C1 Control Input 1
8 C2 Control Input 2
9 D0_0 Analog Switch 0 D- Terminal
10 D0_1 Analog Switch 0 D+ Terminal
12 D1_0 Analog Switch 1 D- Terminal
13 D1_1 Analog Switch 1 D+ Terminal
15 D2_0 Analog Switch 2 D- Terminal
16 D2_1 Analog Switch 2 D+ Terminal
18 D3_0 Analog Switch 3 D- Terminal
19 D3_1 Analog Switch 3 D+ Terminal
22 D4_1 Analog Switch 4 D+ Terminal
23 D4_0 Analog Switch 4 D- Terminal
25 D5_1 Analog Switch 5 D+ Terminal
26 D5_0 Analog Switch 5 D- Terminal
28 D6_1 Analog Switch 6 D+ Terminal
29 D6_0 Analog Switch 6 D- Terminal
31 D7_1 Analog Switch 7 D+ Terminal
32 D7_0 Analog Switch 7 D- Terminal
— EP Exposed Pad. Connect EP to GND or leave unconnected.
