USB251xB/xBi USB 2.0 Hi-Speed Hub Controller PRODUCT FEATURES Datasheet General Description Features The SMSC USB251xB/xBi hub is a family of low-power, configurable, MTT (multi transaction translator) hub controller IC products for embedded USB solutions. The x in the part number indicates the number of downstream ports available, while the B indicates battery charging support.
USB 2.0 Hi-Speed Hub Controller Datasheet Order Numbers: ORDER NUMBERS* USB2512B-AEZG USB2513B-AEZC USB2514B-AEZC USB2512Bi-AEZG USB2513Bi-AEZG USB2514Bi-AEZG LEAD-FREE ROHS COMPLIANT PACKAGE PACKAGE SIZE (MM) TEMPERATURE RANGE 0ºC to 85ºC 36-QFN 6x6x0.5 -40ºC to 85ºC * Add -TR to the end of any QFN order number to order tape and reel (36-pin packages only). Reel size is 3,000 pieces.
USB 2.0 Hi-Speed Hub Controller Datasheet Conventions Within this manual, the following abbreviations and symbols are used to improve readability. Example BIT FIELD.
USB 2.0 Hi-Speed Hub Controller Datasheet Table of Contents Chapter 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.1 Configurable Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Chapter 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Chapter 3 Pin Information.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.29 Register FAh: Port Swap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1.30 Register FBh: PortMap 12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1.31 Register FCh: PortMap 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1.32 Register FFh: Status/Command . . . . . . . . . . . . . . . . . .
USB 2.0 Hi-Speed Hub Controller Datasheet List of Figures Figure 2.1 Figure 3.1 Figure 3.2 Figure 3.3 Figure 3.4 Figure 3.5 Figure 3.6 Figure 4.1 Figure 5.1 Figure 5.2 Figure 5.3 Figure 5.4 Figure 5.5 Figure 6.1 Figure 7.1 Figure 7.2 Figure 8.1 Figure 8.2 Figure 8.3 USB251xB/xBi Hub Family Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-Port 36-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
USB 2.0 Hi-Speed Hub Controller Datasheet List of Tables Table 1.1 Table 3.1 Table 3.2 Table 3.3 Table 3.4 Table 3.5 Table 5.1 Table 6.1 Table 6.2 Table 6.3 Table 6.4 Table 6.5 Table 6.6 Table 6.7 Table 6.8 Table 6.9 Table 6.10 Table 6.11 Table 7.1 Summary of Compatibilities between USB251xB/xBi and USB251x/xi/xA/xAi Products . . . . 9 USB251xB/xBi Pin List (Alphabetical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 USB251xB/xBi Pin List (Alphabetical) . . . . . . .
USB 2.0 Hi-Speed Hub Controller Datasheet Chapter 1 Overview The SMSC USB251xB/xBi hub family is a group of low-power, configurable, MTT (multi transaction translator) hub controller ICs. The hub provides downstream ports for embedded USB solutions and is fully compliant with the USB 2.0 Specification [1]. Each of the SMSC hub controllers can attach to an upstream port as a full-speed or full-/hi-speed hub.
USB 2.
USB 2.0 Hi-Speed Hub Controller Datasheet Chapter 2 Block Diagram To upstream VBUS Upstream USB data To I2C EEPROM or SMBus master 24 MHz crystal SDA SCK 3.3 V VDDA Buspower detect/ Vbus pulse Upstream PHY 1.2 V reg Serial interface PLL Serial interface engine Repeater ... 3.3 V TT #1 1.2 V reg Controller TT #x Port controller VDDCR Routing and port re-ordering logic Port #1 PHY#1 USB data downstream OC sense switch driver/ LED drivers ...
USB 2.0 Hi-Speed Hub Controller Datasheet Chapter 3 Pin Information This chapter outlines the pinning configurations for each package type available, followed by a corresponding pin list organized alphabetically. The detailed pin descriptions are listed then outlined by function in Section 3.3: Pin Descriptions (Grouped by Function) on page 19. 3.
USB 2.
USB 2.
USB 2.0 Hi-Speed Hub Controller Datasheet 3.2 Pin List (Alphabetical) Table 3.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 3.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 3.1 USB251xB/xBi Pin List (Alphabetical) (continued) PIN NUMBERS VBUS_DET Upstream VBUS Power Detection 27 3.3 V Power VDD33 5 VDD33 10 VDD33 15 VDD33 23 VDD33 29 VDD33 36 XTALIN XTALOUT USB2514B USB2514Bi NAME USB2513B USB2513Bi SYMBOL USB2512B USB2512Bi 36 QFN Crystal Input 33 Crystal Output 32 Table 3.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 3.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 3.2 USB251xB/xBi Pin List (Alphabetical) (continued) PIN NUMBERS SMBCLK System Management Bus Clock 24 SMBDATA Server Message Block Data Signal 22 SUSP_IND Active/Suspend Status Indicator 28 TEST USBDM_UP Test Pin 11 USB Bus Data 30 31 USBDP_UP USBDM_DN1 Hi-Speed USB Data 1 3 USBDM_DN2 - USBDM_DN3 6 - USBDM_DN4 4 USBDP_DN2 - USBDP_DN3 9 Upstream VBUS Power Detection 27 3.
USB 2.0 Hi-Speed Hub Controller Datasheet 3.3 Pin Descriptions (Grouped by Function) An N at the end of a signal name indicates that the active (asserted) state occurs when the signal is at a low voltage level. When the N is not present, the signal is asserted when it is at a high voltage level. The terms assertion and negation are used exclusively in order to avoid confusion when working with a mixture of active low and active high signals.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 3.3 USB251xB/xBi Pin Descriptions (continued) SYMBOL BUFFER TYPE DESCRIPTION SERIAL PORT INTERFACES SDA/ I/OSD12 Serial Data Signal SMBDATA/ System Management Bus Signal NON_REM1 Non-Removable Port 1 Strap Option: when enabled by package and configuration options (see Table 5.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 3.3 USB251xB/xBi Pin Descriptions (continued) SYMBOL BUFFER TYPE SUSP_IND/ I/O DESCRIPTION Active/Suspend Status LED: indicates USB state of the hub. Negated = unconfigured; or configured and in USB suspend Asserted = hub is configured and is active (i.e., not in suspend) Local Power: detects availability of local self-power source. LOCAL_PWR/ Low = self/local power source is NOT available (i.e.
USB 2.0 Hi-Speed Hub Controller Datasheet 3.3.1 Configuring the Strap Pins If a pin's strap function is enabled thru the hub configuration selection, (Table 5.1: Initial Interface/Configuration Options on page 26) the strap pins must be pulled either high or low using the values provided in Table 3.4. Each strap option is dependent on the pin’s buffer type, as outlined in the sections that follow. Table 3.
USB 2.0 Hi-Speed Hub Controller Datasheet 3.3.1.3 LED If a strap pin’s buffer type is I/O and shares functionality with an LED, the hardware configuration outlined below must be implemented. The internal logic will drive the LED appropriately (active high or low) depending on the sampled strap option. Use the Strap High configuration to set the strap option value to 1 and Strap Low to set the strap option to 0. +V LED/ Strap High R kΩ Strap Pin Strap Pin HUB HUB R kΩ LED/ Strap Low Figure 3.
USB 2.0 Hi-Speed Hub Controller Datasheet Chapter 4 Battery Charging Support The USB251xB/xBi SMSC hub provides support for battery charging devices on a per port basis in compliance with the USB Battery Charging Specification, Revision 1.1. The hub can be configured to individually enable each downstream port for battery charging support either via pin strapping as illustrated in Figure 4.1 or by setting the corresponding configuration bits via I2C EEPROM or SMBus (Section 5.1 on page 27). 3.3 V 5.
USB 2.0 Hi-Speed Hub Controller Datasheet behaviors provide battery charging even when the hub is not enumerated and protect the hub from sustained short circuit conditions. If the short circuit condition persists when the hub is plugged into a host system the user is notified that a port has an over-current condition. Otherwise PRTPWR turned on by the host system and the ports operate normally. 4.2 Battery Charging Configuration The battery charging option can be configured in one of two ways: 4.
USB 2.0 Hi-Speed Hub Controller Datasheet Chapter 5 Initial Interface/Configuration Options The hub must be configured in order to correctly function when attached to a USB host controller. The hub can be configured either internally or externally by setting the CFG_SEL[1:0] pins (immediately after RESET_N negation) as outlined in the table below. Note: See Chapter 11 (Hub Specification) of the USB specification for general details regarding hub operation and functionality.
USB 2.0 Hi-Speed Hub Controller Datasheet Internal Register Set (Common to I2C EEPROM and SMBus) 5.1 The register set available when configuring the hub to interface over I2C or SMBus is outlined in the table below. Each register has R/W capability, where EEPROM reset values are 0x00. Reserved registers should be written to 0 unless otherwise specified. Contents read from unavailable registers should be ignored.
USB 2.0 Hi-Speed Hub Controller Datasheet 54h-91h Product String 00 92h-CFh Serial String 00 D0h Battery Charging Enable 00 E0h rsvd 00 F5h rsvd 00 F6h Boost_Up 00 F7h rsvd 00 F8h Boost_x:0 00 F9h rsvd 00 FAh Port Swap 00 FBh Port Map 12 00 FCh Port Map 34 FD-FEh rsvd 00 FFh Status/Command Note: SMBus register only 00 5.1.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.3 Register 02h: Product ID (LSB) BIT NUMBER BIT NAME DESCRIPTION 7:0 PID_LSB Least Significant Byte of the Product ID: a 16-bit value that uniquely identifies the Product ID of the user device. Set this field using either the SMBus or I2C EEPROM interface options. 5.1.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.7 Register 06h: CONFIG_BYTE_1 BIT NUMBER BIT NAME 7 SELF_BUS_PWR DESCRIPTION Self or Bus Power: selects between self- and bus-powered operation. The hub is either self-powered (draws less than 2 mA of upstream bus power) or bus-powered (limited to a 100 mA maximum of upstream power prior to being configured by the host controller). When configured as a bus-powered device, the SMSC hub consumes less than 100 mA of current prior to being configured.
USB 2.0 Hi-Speed Hub Controller Datasheet BIT NUMBER BIT NAME 0 PORT_PWR DESCRIPTION Port Power Switching: enables power switching on all ports (ganged) or a port-by-port basis (individual). The ability to support power enabling on a ganged or port-by-port basis is hardware implementation dependent. 0 : ganged switching 1 : individual switching 5.1.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.9 Register 08h: Configuration Data Byte 3 BIT NUMBER BIT NAME 7:4 rsvd 3 PRTMAP_EN DESCRIPTION Port Mapping Enable: selects the method used by the hub to assign port numbers and disable ports. 0 : standard mode 1 : port mapping mode 2:1 rsvd 0 STRING_EN Enables String Descriptor Support 0 : string support disabled 1 : string support enabled 5.1.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.11 Register 0Ah: Port Disable For Self-Powered Operation BIT NUMBER BIT NAME 7:0 PORT_DIS_SP DESCRIPTION Port Disable Self-Powered: disables one or more ports.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.13 Register 0Ch: Max Power For Self-Powered Operation BIT NUMBER BIT NAME DESCRIPTION 7:0 MAX_PWR_SP Max Power Self-Powered: the value in 2 mA increments that the hub consumes from an upstream port (VBUS) when operating as a self-powered hub. This value includes the hub silicon along with the combined power consumption (from VBUS) of all associated circuitry on the board.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.16 Register 0Fh: Hub Controller Max Current For Bus-Powered Operation BIT NUMBER BIT NAME DESCRIPTION 7:0 HC_MAX_C_BP Hub Controller Max Current Bus-Powered: the value in 2 mA increments that the hub consumes from an upstream port (VBUS) when operating as a buspowered hub. This value will include the hub silicon along with the combined power consumption (from VBUS) of all associated circuitry on the board.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.21 Register 14h: Product String Length BIT NUMBER BIT NAME DESCRIPTION 7:0 PRD_STR_LEN Product String Length: with a maximum string length of 31 characters (when supported). 5.1.22 Register 15h: Serial String Length BIT NUMBER BIT NAME DESCRIPTION 7:0 SER_STR_LEN Serial String Length: with a maximum string length of 31 characters (when supported). 5.1.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.25 Register 92h-CFh: Serial String BIT NUMBER BIT NAME 7:0 SER_STR DESCRIPTION Serial String: UNICODE UTF-16LE per USB 2.0 specification When supported, the maximum string length is 31 characters (62 bytes). The string consists of individual 16-bit UNICODE UTF-16LE characters. The characters will be stored starting with the LSB at the least significant address and the MSB at the next 8-bit location.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.28 Register F8h: Boost_4:0 BIT NUMBER BIT NAME 7:6 BOOST_IOUT_4 DESCRIPTION USB electrical signaling drive strength boost bit for downstream port 4.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.30 Register FBh: PortMap 12 BIT NUMBER BIT NAME DESCRIPTION 7:0 PRTR12 PortMap Register for Ports 1 and 2: When a hub is enumerated by a USB host controller, the hub is only permitted to report how many ports it has; the hub is not permitted to select a numerical range or assignment. The host controller will number the downstream ports of the hub starting with the number 1, up to the number of ports that the hub reports having.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.31 Register FCh: PortMap 34 BIT NUMBER BIT NAME DESCRIPTION 7:0 PRTR34 PortMap Register for Ports 3 and 4: When a hub is enumerated by a USB host controller, the hub is only permitted to report how many ports it has; the hub is not permitted to select a numerical range or assignment. The host controller will number the downstream ports of the hub starting with the number 1, up to the number of ports that the hub reports having.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.1.32 Register FFh: Status/Command BIT NUMBER BIT NAME 7:3 rsvd 2 INTF_PW_DN DESCRIPTION SMBus Interface Power Down: 0 : interface is active 1 : interface power down after ACK has completed 1 RESET Reset the SMBus interface and internal memory back to RESET_N assertion default settings.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.2.3 Pull-Up Resistor The circuit board designer is required to place external pull-up resistors (10 kΩ recommended) on the SDA/SMBDATA and SCL/SMBCLK/CFG_SEL[0] lines (per SMBus 1.0 Specification [3], and EEPROM manufacturer guidelines) to VDD33 in order to assure proper operation. 5.2.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.3.2.1 Block Write/Read The block write begins with a slave address and a write condition. After the command code, the host issues a byte count which describes how many more bytes will follow in the message. If a slave had 20 bytes to send, the first byte would be the number 20 (14h), followed by the 20 bytes of data. The byte count may not be zero. A block write or read allows a transfer maximum of 32 data bytes.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.3.4 Stretching the SCLK Signal The hub supports stretching of the SCLK by other devices on the SMBus. However, the hub does not stretch the SCLK. 5.3.5 SMBus Timing The SMBus slave interface complies with the SMBus Specification Revision 1.0 [3]. See Section 2.1, AC Specifications on page 3 for more information. 5.3.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.5.1.1 RESET_N for Strapping Option Configuration Hardware reset asserted Drive strap outputs to Attach USB inactive levels upstream Read CFG_SEL[1:0] t1 USB reset recovery t7 t6 t5 Start completion request response Idle t8 t2 t3 RESET_N VSS t4 CFG_SEL[2:0] don’t care valid driven by hub if strap is an output don’t care VSS Figure 5.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.5.1.2 RESET_N for EEPROM Configuration Hardware reset asserted Read CFG_SEL[1:0] Read I2C EEPROM t1 Attach USB upstream t6 USB reset recovery t7 Start completion request response Idle t8 t9 t5 t2 t3 RESET_N t4 VSS CFG_SEL[2:0] don’t care valid don’t care VSS Figure 5.4 Reset_N Timing for EEPROM Mode NAME DESCRIPTION MIN TYP MAX UNITS 1 μs CFG_SEL[1:0] setup time 16.7 ns t3 CFG_SEL[1:0] hold time 16.
USB 2.0 Hi-Speed Hub Controller Datasheet RESET_N for SMBus Slave Configuration 5.5.1.3 Hardware reset asserted Read SMBus code Hub PHY Attach USB stabilization upstream CFG_SEL[1:0] load t1 t6 t5 USB reset recovery t7 Start completion request response Idle t8 t9 t2 t3 RESET_N t4 VSS CFG_SEL[2:0] don’t care valid don’t care VSS Figure 5.5 Reset_N Timing for SMBus Mode NAME DESCRIPTION MIN TYP MAX UNITS 1 μs CFG_SEL[1:0] setup time 16.7 ns t3 CFG_SEL[1:0] hold time 16.
USB 2.0 Hi-Speed Hub Controller Datasheet 5.5.2 USB Bus Reset In response to the upstream port signaling a reset to the hub, the hub does the following: 1. Sets default internal USB address to 0 2. Sets configuration to: unconfigured 3. Negates PRTPWR[x:1] to all downstream ports unless battery charging (BC_EN[x:1]) is enabled 4. Clears all TT buffers 5. Moves device from suspended to active (if suspended) 6. Complies with Section 11.10 of the USB 2.
USB 2.0 Hi-Speed Hub Controller Datasheet Chapter 6 DC Parameters 6.1 Maximum Guaranteed Ratings PARAMETER SYMBOL Storage Temperature TSTOR MIN MAX -55 UNITS 150 COMMENTS °C Lead Temperature Refer to JEDEC Specification J-STD020D [5] 3.3 V supply voltage VDD33 VDDA33 4.6 V Voltage on any I/O pin -0.5 5.5 V Voltage on XTALIN -0.5 4.0 V Voltage on XTALOUT -0.5 2.5 V Applies to all packages Notes: 6.
USB 2.0 Hi-Speed Hub Controller Datasheet PARAMETER SYMBOL Voltage on any I/O pin MIN MAX UNITS COMMENTS -0.3 5.5 V If any 3.3 V supply voltage drops below 3.0 V, then the MAX becomes: (3.3 V supply voltage) + 0.5 Voltage on XTALIN -0.3 Voltage VDD33 V tRT33 VDD33 3.3 V 100% 90% VSS 10% t90% t10% Time Figure 6.1 Supply Rise Time Model Table 6.1 DC Electrical Characteristics PARAMETER SYMBOL MIN TYP MAX UNITS 0.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 6.1 DC Electrical Characteristics (continued) PARAMETER SYMBOL MIN TYP MAX UNITS 0.8 V COMMENTS Input Buffer with Pull-Down (IPD) Low Input Level VILI TTL Levels High Input Level VIHI 2.0 Low Input Leakage IILL +10 -10 μA VIN = 0 High Input Leakage IIHL -35 -90 μA VIN = VDD33 0.3 V V USB251xB/xBi ICLK Input Buffer Low Input Level VILCK High Input Level VIHCK 0.9 Input Leakage IIL -10 V +10 μA VIN = 0 to VDD33 0.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 6.3 Supply Current Unconfigured: Full-Speed Host (ICCINTFS) PART MIN TYP MAX UNITS USB2512B/12Bi 35 40 mA USB2513B/13Bi 35 40 mA USB2514B/14Bi 35 40 mA COMMENTS Table 6.
USB 2.0 Hi-Speed Hub Controller Datasheet Table 6.6 Supply Current Suspend (ICSBY) PART MIN TYP MAX UNITS USB2512B 475 1000 μA USB2512Bi 475 1200 μA USB2513B 500 1100 μA USB2513Bi 500 1300 μA USB2514B 550 1200 μA USB2514Bi 550 1500 μA COMMENTS All supplies combined Table 6.
USB 2.0 Hi-Speed Hub Controller Datasheet 6.2.1 Package Thermal Specifications Thermal parameters are measured or estimated for devices with the exposed pad soldered to thermal vias in a multilayer 2S2P PCB per JESD51. Thermal resistance is measured from the die to the ambient air. The values provided are based on the package body, die size, maximum power consumption, 85°C ambient temperature, and 125°C junction temperature of the die.
USB 2.0 Hi-Speed Hub Controller Datasheet TJ = P x ΘJC + TC Max Power Supported = (TJ Max. Spec. x TAmb.)/ ΘJA Table 6.11 Legend SYMBOL SMSC USB251xB/xBi DESCRIPTION TJ Junction temperature P Power dissipated ΘJA Junction-to-ambient-temperature ΘJC Junction-to-top-of-package ΨJT Junction-to-bottom-of-case TA Ambient temperature TC Temperature of the bottom of the case TT Temperature of the top of the case 55 DATASHEET Revision 2.
USB 2.0 Hi-Speed Hub Controller Datasheet Chapter 7 AC Specifications 7.1 Oscillator/Crystal Crystal: Parallel resonant, fundamental mode, 24 MHz ±350 ppm XTAL1 (CS1 = CB1 + CXTAL1 ) C1 C0 Crystal 1M CL C2 XTAL2 (CS2 = CB2 + CXTAL2 ) Figure 7.1 Typical Crystal Circuit Table 7.
USB 2.0 Hi-Speed Hub Controller Datasheet 7.2 External Clock 50% duty cycle ± 10%, 24 MHz ± 350 ppm, jitter < 100 ps rms. The external clock is recommended to conform to the signaling level designated in the JESD76-2 Specification [5] on 1.2 V CMOS Logic. XTALOUT should be treated as a weak (<1mA) buffer output. 7.2.1 SMBus Interface The SMSC hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the SMBus 1.
USB 2.0 Hi-Speed Hub Controller 58 DATASHEET SMSC USB251xB/xBi Figure 8.1 36-Pin QFN, 6x6 mm Body, 0.5 mm Pitch Datasheet Revision 2.
USB 2.0 Hi-Speed Hub Controller Datasheet 8.1 Tape and Reel Specifications Figure 8.2 36-Pin Package Tape Specifications SMSC USB251xB/xBi 59 DATASHEET Revision 2.
USB 2.0 Hi-Speed Hub Controller Datasheet Figure 8.3 36-Pin Package Reel Specifications Revision 2.
USB 2.0 Hi-Speed Hub Controller Datasheet Appendix A (Acronyms) I2C®: Inter-Integrated Circuit1 OCS: Over-Current Sense PCB: Printed Circuit Board PHY: Physical Layer PLL: Phase-Locked Loop QFN: Quad Flat No Leads RoHS: Restriction of Hazardous Substances Directive SCL: Serial Clock SIE: Serial Interface Engine SMBus: System Management Bus TT: Transaction Translator 1.I2C is a registered trademark of Philips Corporation. SMSC USB251xB/xBi 61 DATASHEET Revision 2.
USB 2.0 Hi-Speed Hub Controller Datasheet Appendix B (References) [1] Universal Serial Bus Specification, Version 2.0, April 27, 2000 (12/7/2000 and 5/28/2002 Errata) USB Implementers Forum, Inc. http://www.usb.org [2] I2C-Bus Specification Version 1.1 NXP (formerly a division of Philips). http://www.nxp.com [3] System Management Bus Specification, version 1.0 SMBus. http://smbus.org/specs/ [4] MicroChip 24AA02/24LC02B (Revision C) Microchip Technology Inc. http://www.microchip.
USB 2.0 Hi-Speed Hub Controller Datasheet Datasheet Revision History Customer Revision History REVISION LEVEL & DATE Rev. 2.2 (02-17-12) SECTION/FIGURE/ENTRY CORRECTION Cover Updated clock bullet to remove reference to 48MHz clock support. Section 1.1: Configurable Features on page 8 Updated bulleted lists.