USB3500-ABZJ Standard Microsystems (SMSC), USB3500-ABZJ Datasheet - Page 25

• Manufacturer Part Number: USB3500-ABZJ
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB3500-ABZJ

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Package Type: QFN
• Rad Hardened: No
• Lead Free Status / Rohs Status: Compliant

Hi-Speed USB Host, Device or OTG PHY With UTMI+ Interface
Datasheet
SMSC USB3500
6.4
6.4.1
6.4.2
USB 2.0 Transceiver
The SMSC Hi-Speed USB 2.0 Transceiver consists of four blocks in the lower left corner of
on page
High Speed and Full Speed Transceivers
The USB3500 transceiver meets all requirements in the USB 2.0 specification.
The receivers connect directly to the USB cable. This block contains a separate differential receiver
for HS and FS mode. Depending on the mode, the selected receiver provides the serial data stream
through the multiplexer to the RX Logic block. The FS mode section of the FS/HS RX block also
consists of a single-ended receiver on each of the data lines to determine the correct FS linestate. For
HS mode support, the FS/HS RX block contains a squelch circuit to insure that noise is never
interpreted as data.
The transmitters connect directly to the USB cable. The block contains a separate differential FS and
HS transmitter which receive encoded, bit stuffed, serialized data from the TX Logic block and transmit
it on the USB cable.
Termination Resistors
The USB3500 transceiver fully integrates all of the USB termination resistors. The USB3500 includes
two 1.5kΩ pull-up resistors on DP and DM and a 15kΩ pull-down resistor on both DP and DM. In
addition the 45Ω high speed termination resistors are also integrated. These integrated resistors
require no tuning or trimming by the Link. The state of the resistors is determined by the operating
mode of the PHY. The possible valid resistor combinations are shown in
SETTINGS signals shown in the table are internal to the USB3500.
RPU_DP_EN activates the 1.5kΩ DP pull-up resistor
RPU_DM_EN activates the 1.5kΩ DM pull-up resistor
RPD_DP_EN activates the 15kΩ DP pull-down resistor
RPD_DM_EN activates the 15kΩ DM pull-down resistor
9. These four blocks are labeled HS XCVR, FS/LS XCVR, Resistors, and Bias Gen.
Figure 6.7 Receive Timing for Data Packet (with CRC-16)
DATASHEET
25
Table
6.1. The RESISTOR
Revision 1.0 (06-05-08)
Figure 2.1