High Speed USB 2.0 Switch with ESD Protection and Low
Standby Current
Features
• High Speed USB Mux for multiplexing the USB
lanes between different functions
- Switch the USB connector between two dif-
ferent functions
- Up to 1GHz Bandwidth
• USB Port ESD Protection (DP/DM)
- ±15kV (air discharge)
- ±15kV (contact discharge)
- IEC 61000-4-2 level 4 ESD protection without
external devices
• flexPWR
TM
Technology
- 30nA Active/Standby Current
- Extremely low power design ideal for battery
powered applications
• Control inputs accommodate 1.8V to 5V inputs
• DP/DM tolerate up to 5.5V
• Industrial Operating Temperature -40°C to +85°C
• 10 pin, QFN, RoHS compliant package;
(1.3mm x 1.8mm x 0.55mm height, 0.4mm pitch)
• 10 pin, QFN, RoHS compliant package;
(1.6mm x 2.1mm x 0.55mm height, 0.5mm pitch)
Block Diagram
USB3740B
DP_2
USB Connector
ESD Protection
ESD Protection
DP
DM
DP
DM
DM_2
USB 2.0 PHY,
Processor, or
Accessory
HS USB
Switch
DP_1
DM_1
DP
DM
USB 2.0 PHY,
Processor, or
Accessory
VDD
VDD
OE_N
GND
S
Processor
2011 - 2014 Microchip Technology Inc.
DS00001725B-page 1
USB3740B
TO OUR VALUED CUSTOMERS
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. We welcome your feedback.
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You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-
rent devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the
revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
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When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are
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DS00001725B-page 2
2011 - 2014 Microchip Technology Inc.
USB3740B
Table of Contents
1.0 General Description ........................................................................................................................................................................ 4
4.0 General Operation .......................................................................................................................................................................... 7
The Microchip Web Site ...................................................................................................................................................................... 12
Customer Change Notification Service ............................................................................................................................................... 12
Customer Support ............................................................................................................................................................................... 12
Product Identification System ............................................................................................................................................................. 13
2011 - 2014 Microchip Technology Inc.
DS00001725B-page 3
USB3740B
1.0
GENERAL DESCRIPTION
The USB3740B is a USB 2.0 compliant High Speed switch that provides robust ESD protection to the interface in an
extremely small package. Outstanding ESD robustness eliminates the need for external ESD protection devices to save
eBOM cost and PCB area.
The high bandwidth capabilities of the USB3740B enable extremely low high frequency loss and an exceptionally clean
USB 2.0 High Speed eye diagram.
FIGURE 1-1:
USB3740B USB 2.0 HIGH SPEED EYE DIAGRAM
Input to Switch
Output of Switch
1.1
Reference Document
Universal Serial Bus Specification, Revision 2.0
DS00001725B-page 4
2011 - 2014 Microchip Technology Inc.
USB3740B
2.0
2.1
PIN LAYOUT
Pin Diagram
The USB3740B is available in both a 0.4mm pitch QFN (1.3mm x 1.8mm) and 0.5mm pitch QFN (1.55mm x 2.05mm)
package.
FIGURE 2-1:
USB3740B PACKAGE DIAGRAM
OE_N
S
VDD
DM_1
DP_1
3
4
10
9
DP
DM
GND
2
6
5
7
DM_2
1
8
2.2
Ball/Pin Definitions
The following table details the ball/pin definitions for the package diagram above.
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