参数资料
型号: ST72621L4M1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO34
封装: 0.300 INCH, LEAD FREE, SHRINK, PLASTIC, SOP-34
文件页数: 21/139页
文件大小: 1264K
代理商: ST72621L4M1
117/139
Doc ID 6996 Rev 5
12.11 COMMUNICATION INTERFACE CHARACTERISTICS
12.11.1 USB - Universal Bus Interface
(Operating conditions T
A = 0 to +70°C, V
DD = 4.0 to 5.25V unless otherwise specified)
Notes
1. RL is the load connected on the USB drivers.
2. All the voltages are measured from the local ground potential.
3. Not tested in production, guaranteed by design.
4. To improve EMC performance (noise immunity), it is recommended to connect a 100nF capacitor to the
USBVCC pin.
Figure 77. USB: Data Signal Rise and Fall Time
Table 26. USB: Low-speed Electrical Characteristics
Note 1: Measured from 10% to 90% of the data signal. For more detailed informations, please refer to Chapter 7 (Elec-
trical) of the USB specification (version 1.1).
USB DC Electrical Characteristics
Parameter
Symbol
Conditions 2)
Min.
Max.
Unit
Differential Input Sensitivity
VDI
I(D+, D-)
0.2 3)
V
Differential Common Mode Range
VCM
Includes VDI range
0.8 3)
2.5 3)
V
Single Ended Receiver Threshold
VSE
0.8 3)
2.0 3)
V
Static Output Low
VOL
RL of 1.5K ohms to 3.6V 1)
0.3
V
Static Output High
VOH
RL of 15K ohms to VSS
1)
2.8
3.6
V
USBVCC: voltage level 4)
USBV
VDD=5V
3.00
3.60
V
Differential
Data Lines
VSS
tf
tr
Crossover
points
VCRS
Parameter
Symbol
Conditions
Min
Max
Unit
Driver characteristics:
Rise time
tr
CL=50 pF 1)
75
ns
CL=600 pF 1)
300
ns
Fall Time
tf
CL=50 pF 1)
75
ns
CL=600 pF 1)
300
ns
Rise/ Fall Time matching
trfm
tr/tf
80
120
%
Output signal Crossover
Voltage
VCRS
1.3
2.0
V
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