USB2514B-AEZG

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1. Description

The Microchip USB2514B-AEZG 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 hub controllers can attach to an upstream port as a full-speed or full-/hi-speed hub. The hub can support low-speed, full-speed, and hi-speed downstream devices when operating as a hi-speed hub. All required resistors on the USB ports are integrated into the hub. This includes all series termination resistors and all required pull-down and pull-up resistors on D+ and D- pins. The over-current sense inputs for the downstream facing ports have internal pull-up resistors. 

2. Features

    1. USB251xB/xBi products are fully footprint compatible with USB251x/xi/xA/xAi products as direct drop-in replacements

        - Cost savings include using the same PCB components and application of USB-IF Compliance by Similarity

    2. Full power management with individual or ganged power control of each downstream port

    3. Fully integrated USB termination and pull-up/pulldown resistors

    4. Supports a single external 3.3 V supply source; internal regulators provide 1.2 V internal core voltage

    5. Onboard 24 MHz crystal driver or external 24 MHz clock input

    6. Customizable vendor ID, product ID, and device ID

    7. 4 kilovolts of HBM JESD22-A114F ESD protection

    8. Supports self- or bus-powered operation

    9. Supports the USB Battery Charging specification Rev. 1.1 for Charging Downstream Ports (CDP)

  10. The USB251xB/xBi offers the following packages:

        - 36-pin SQFN (6x6 mm) (Preferred)

        - 36-pin QFN (6x6 mm) (Legacy)

  11. USB251xBi products support the industrial temperature range of -40ºC to +85ºC

  12. USB251xB products support the extended commercial temperature range of 0ºC to +85ºC

3. Applications

    1. LCD monitors and TVs

    2. Multi-function USB peripherals

    3. PC motherboards

    4. Set-top boxes, DVD players, DVR/PVR

    5. Printers and scanners

    6. PC media drive bay

    7. Portable hub boxes

    8. Mobile PC docking

    9. Embedded systems

4. The USB251xB/xBi hub family includes programmable features

    1. MultiTRAKTM Technology: 

        - Implements a dedicated Transaction Translator (TT) for each port.

    2. PortMap: 

        - Provides flexible port mapping and disable sequence.

    3. PortSwap: 

        - Allows direct alignment of USB signals (D+/D-) to connectors to avoid uneven trace lengths on the PCB or crossover of USB differential signals.

    4. PHYBoost:

        - Enables 4 programmable USB signal drive strength levels in the downstream port transceiver.

5. Emphasize

    1. High performance, low power, small form factor hub Controller IC with 2, 3 or 4 downstream ports

    2. Fully compliant with the USB 2.0 specification

    3. Provides enhanced OEM configuration options via a single serial I2C EEPROM, or SMBus slave port

    4. MultiTRAKTM

        - High performance multi-transaction translator, one transaction translator per port

    5. Port Mapping

        - Flexible port mapping and disable ordering

    6. Port switching

        - Programmable USB differential pair pin locations simplify PCB design by aligning USB signal lines directly to connectors

    7. Physical boost

        - Programmable USB signal drive strength with 4 levels of drive strength resolution to restore signal integrity

6. Configurable Features

    1. Downstream non-removable ports, the hub will automatically report as a composite device

    2. Downstream disabled ports

    3. Enable battery charging option on each port

    4. The USB251xB/xBi hub controller can also be configured as an SMBus slave via an external I2C EEPROM or microcontroller.

    5. Support for port-by-port composite devices

    6. Selectable overcurrent detection and port power control, either individually or in groups to match board Component selection

    7. Customizable Vendor ID, Product ID and Device ID

    8. Configurable USB signal drive strength

    9. Configurable USB differential pair pin locations

  10. Configurable delay time for filtering overcurrent detection input

  11. Reports configurable downstream port up time to the host

  12. Indicates the maximum current drawn by the hub from the USB upstream port

  13. Indicates the maximum current required by the hub controller

  14. Custom string descriptor (up to 31 characters):

        - product

        - manufacturer

        - serial number

  15. Battery charging USB251xB/xBi products are fully compatible with USB251x/xi/xA/xAi products:

        - Pin compatible

        - direct replacement

        - Use the same PCB components

7. Pin configuration