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Data Sheet, Rev. 4

June 2001

USS-820D

USB Device Controller

Features

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New Features After Revision B

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Full compliance with the

Universal Serial Bus

Specification Revision 1.1.

Backward compatible with USS-820B and

USS-820C revisions.

Self-powered or bus-powered USB device. Meets

USB power specifications for bus-powered

devices.

Full-speed USB device (12 Mbits/s).

USB device controller with protocol control and

administration for up to 16 USB endpoints.

Supports control, interrupt, bulk, and isochronous

transfers for all 16 endpoints.

Programmable endpoint types and FIFO sizes and

internal 1120-byte logical (2240-byte physical for

dual-packet mode) shared FIFO storage allow a

wide variety of configurations.

Dual-packet mode of FIFOs reduces latency.

Supports USB remote wake-up feature.

On-chip crystal oscillator allows external 12 MHz

crystal or 3 V/5 V clock source.

On-chip analog PLL creates 48 MHz clock from

internal 12 MHz clock.

Integrated USB transceivers.

5 V tolerant I/O buffers allow operation in 3 V or 5

V system environments for 0 擄C to 70 擄C tempera-

ture range.

5 V tolerant I/O buffers allow operation in 3 V only

system environments for 鈥?0 擄C to +85 擄C temper-

ature range.

Implemented in Agere Systems Inc. 0.25

碌m,

3 V

standard-cell library.

44-pin MQFP (USS-820D).

48-pin TQFP (USS-820TD).

Evaluation kit available.

New, centralized FIFO status bits and interrupt out-

put pin reduce firmware load.

New, additional nonisochronous transmit mode

allows NAK response to cause interrupt.

Isochronous behavior enhancements simplify firm-

ware control.

Additional FIFO sizes for nonisochronous end-

points.

USB reset can be programmed to clear device

address.

USB reset output status pin.

Firmware ability to wake up and reset a suspended

device.

Lower power.

5 V supply no longer required for 5 V tolerant oper-

ation.

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Applications

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Suitable for peripherals with embedded micropro-

cessors.

Glueless interface to microprocessor buses.

Support of multifunction USB implementations,

such as printer/scanner and integrated multimedia

applications.

Suitable for a broad range of device class periph-

erals in the USB standard.

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Note:

Advisories are issued as needed to update product information. When using this data sheet for design purposes, please contact

your Agere Systems Account Manager to obtain the latest advisory on this product.

next

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