MAX14978 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – SuperSpeed USB Passive Switch (Low/Full/Hi/SuperSpeed)

19-5573; Rev 1; 4/11
SuperSpeed USB Passive Switch
(Low/Full/Hi/SuperSpeed)
General Description
The MAX14978 high-performance, passive analog switch
is ideal for switching Hi-Speed USB and SuperSpeed USB
data between one source and two loads, or vice versa. The
device can be used in desktop and notebook applications
where SuperSpeed USB ports are in limited supply. The
device consists of two sets of analog switches with one
set used for USB low-speed, full-speed, and Hi-Speed
signals and the second set used for USB SuperSpeed.
The device operates from a single +3.3V supply.
The device features low insertion loss for all speeds. It
has Q6kV Human Body Model (HBM) ESD protection
on all I/O pins. In addition, the low/full/Hi-Speed COM_
ports have ESD protection to Q15kV HBM and Q8kV IEC
61000-4-2 contact.
The device is available in a small, 3.5mm x 9.0mm,
42-pin TQFN package and is specified over the extend-
ed -40NC to +85NC temperature range.
Desktop PCs
Laptop PCs
Industrial USB Switching
Applications
Features
S Designed for SuperSpeed USB Applications:
Low/Full/Hi-Speed (1.5/12/480Mbps)
SuperSpeed (5.0Gbps)
S Superior Return Loss and Insertion Loss for
SuperSpeed Analog Switches
S Low Quiescent Current: 36µA (typ)
S All Link Training is Preserved (SuperSpeed)
S LVCMOS Control (1.4V P VIH P 3.6V)
S Operation from a Single +3.3V Power Supply
S Small, 3.5mm x 9.0mm, 42-Pin TQFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX14978ETO+
-40NC to +85NC
42 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
USB SWITCH
CONTROLLER
D+
D-
SUPERSPEED _Tx+
USB
CONTROLLER Tx-
Rx+
Rx-
+3.3V
0.1µF
SEL1 SEL2 VCC
COMD+
COMD-
VDD
NCD+
NCD-
NOD+
NOD-
COM0+
COM0-
COM1+
COM1-
MAX14978
EN
GND
NC0+
NC0-
NC1+
NC1-
NO0+
NO0-
NO1+
NO1-
D+
D-
SUPERSPEED
Tx+
USB
Tx- _PORT1
Rx+
Rx-
D+
D-
Tx+ ^SUPERSPEED
Tx-
USB
PORT2
Rx+
Rx-
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.