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| 型號： | MC68HC05JB4DW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 111/134頁 |
| 文件大?。?/td> | 2440K |
| 代理商： | MC68HC05JB4DW |
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GENERAL RELEASE SPECIFICATION
February 24, 1999
UNIVERSAL SERIAL BUS MODULE
REV
with respect to local ground reference without damage.
10.4.2.2 Low Speed (1.5 Mbs) Driver Characteristics
The rise and fall time of the signals on this cable are greater than 75 ns to keep
RFI emissions under FCC class B limits, and less than 300 ns to limit timing
delays and signaling skews and distortions. The driver reaches the specied static
signal levels with smooth rise and fall times, and minimal reections and ringing
when driving the cable. This driver is used only on network segments between low
speed devices and the ports to which they are connected.
Figure 10-12. Low Speed Driver Signal Waveforms
10.4.3 Receiver Characteristics
USB data transmission is done with differential signals. A differential input receiver
is used to accept the USB data signal. A differential 1 on the bus is represented by
D+ being at least 200 mV more positive than D– as seen at the receiver, and a
differential 0 is represented by D– being at least 200 mV more positive than D+ as
seen at the receiver. The signal cross over point must be between 1.3V and 2.0V.
The receiver features an input sensitivity of 200 mV when both differential data
inputs are in the range of 0.8 V to 2.5 V with respect to the local ground reference.
This is called the common mode input voltage range. Proper data reception is also
achieved when the differential data lines are outside the common mode range, as
shown in Figure 10-13. The receiver can tolerate static input voltages between
–0.5V to 3.8 V with respect to its local ground reference without damage. In
addition to the differential receiver, there is a single-ended receiver (schmitt
trigger) for each of the two data lines.
ONE BIT
TIME
(1.5 Mb/s)
SIGNAL PINS
PASS OUTPUT SPEC
LEVELS WITH MINIMAL
REFLECTIONS AND RINGING
VSE (min)
VSE (max)
VSS
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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