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參數(shù)資料
| 型號： | USS820D-DB |
| 英文描述： | USS-820D USB Device Controller |
| 中文描述： | 號- 820D USB設(shè)備控制器 |
| 文件頁數(shù)： | 47/58頁 |
| 文件大小： | 868K |
| 代理商： | USS820D-DB |
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Agere Systems Inc.
47
Data Sheet, Rev. 4
June 2001
USB Device Controller
USS-820D
Application Notes
1. The RESET input must remain asserted for a minimum period of time after power is stable. If internal oscillator
clocking mode is used, this time is t
OSC
, the amount of time required to allow the internal oscillator output to
become stable. If external oscillator clocking mode is used, this time is t
RST
. The USS-820D WRN and RWUPN
pins must not both be active (low) at the time that the RESET input is deasserted.
2. After changing the size (RXFFSZ/TXFFSZ), type (isochronous vs. nonisochronous), enabled status (RXEPEN/
TXEPEN) of a FIFO/endpoint or chip features (FEAT, BDFEAT), firmware must guarantee that at least 16 t
CLK
periods have elapsed before attempting to access the FIFO data. This is required to allow the internal FIFO
RAM to be reallocated.
3. Register writes are triggered by the rising edge of either WRN or IOCSN, whichever comes first, and are syn-
chronized to the internal 12 MHz clock. Therefore, the actual write may not occur until as much as t
CLK
ns after
that first rising edge. This latency must be taken into account when performing subsequent register reads or
writes.
4. The IRQN and SOFN pins require external pull-ups or pull-downs if the external controller will be powered off
during suspend. In that situation, those pins will be 3-stated until the USS-820D has fully resumed. The pull-up
or pull-down is needed to establish the desired level at the controller for the time interval from when the control-
ler is powered on to the time when the USS-820D has completed the resume. The same requirements hold for
the USBR and DSA outputs if they are connected to devices that will be powered off during suspend.
5. In applications where the external controller is powered off during suspend (firmware has set SSR.SUSPPO),
the SOFN pin must be connected to an external pull-down even if the pin is not functionally required. The pin is
actually bidirectional, where the input mode is only used in chip test modes. The pull-down is required to avoid
excessive power consumption by the input stage when the device is suspended.
1394 Application Support Contact Information
E-mail: 1394support@agere.com
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operations sections of this data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Table 41. Absolute Maximum Ratings
Table 42. Absolute Maximum Voltage Ratings
(0 °C
≤
T
A
≤
85 °C)
Table 43. Absolute Maximum Voltage Ratings
(–20 °C
≤
T
A
≤
0 °C)
Parameter
Symbol
T
A
T
stg
V
DD
Min
–20
40
—
Max
85
125
4.2
Unit
°
C
°
C
V
Ambient Operating Temperature Range
Storage Temperature
Power Supply Voltage with Respect to Ground
Parameter
Symbol
—
Min
Max
5.5
Unit
V
Voltage on Any Non-USB Pin with Respect to Ground
V
SS
0.3
Parameter
Symbol
—
Min
Max
3.6
Unit
V
Persistent* Voltage on Any Non-USB Pin with Respect
to Ground
Non-persistent* Voltage on Any Non-USB Pin with
Respect to Ground
* A persistent voltage level is considered to be one which lasts for more than 25 ns.
V
SS
0.3
—
V
SS
0.3
5.5
V
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