参数资料
型号: ST72621J2T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封装: 0.300 INCH, PLASTIC, SO-20
文件页数: 21/136页
文件大小: 2475K
代理商: ST72621J2T1
117/136
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)
Note 1: RL is the load connected on the USB drivers.
Note 2: All the voltages are measured from the local ground potential.
Note 3: Not tested in production, guaranteed by design.
Note 4: To improve EMC performance (noise immunity), it is recommended to connect a 100nF capacitor
to the USBVCC pin.
Figure 78. USB: Data Signal Rise and Fall Time
Table 27. 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
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
0.3
V
Static Output High
VOH
RL of 15K ohms to VSS
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
Note 1,CL=50 pF
75
ns
Note 1, CL=600 pF
300
ns
Fall Time
tf
Note 1, CL=50 pF
75
ns
Note 1, CL=600 pF
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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