ST7554 Ver la hoja de datos (PDF) - STMicroelectronics
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ST7554 Datasheet PDF : 11 Pages
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ST7554
UNIVERSAL SERIAL BUS INTERFACE
(see Chapter 7 of USB rev 1.0 for complete Electrical Specification)
Nominal DC Characteristics (D+, D-)
Symbol
Parameter
Min. Typ. Max. Unit
VDI
VCM
VSE
VOH
VOL
ILO
CIN
RD (2)
Differential Input Sensitivity [(D+) - (D-)]
Differential Common Mode Range
Single Ended Receiver Threshold
High Level Output Static Voltage (RL of 15kΩ to GND)
Low Level Output Static Voltage (RL of 1.5kΩ to 3.6V)
Hi-Z State Data Line Leakage Current (0V < VIN < 3.3V)
Transceiver Capacitance (Pin to GND)
Driver Output Resistance (steady state drive)
0.2
0.8
0.8
2.8
TBD
V
2.5
V
2
V
3.6
V
0.3
V
±10
µA
20
pF
TBD
Ω
Note 2 : Excludes external resistor. In order to comply with USB Specifications 1.0, external series resistors of 27Ω ±1% each on D+ and D-
are recommended
AC Characteristics (D+, D-) (see Figure 5 for test scheme)
Symbol
Parameter
tDR
tR
tF
VCRS
Average bit rate (12 M/s ± 0.05%)
Rise Time between 10% and 90% (see Figure 6)
Fall Time 10% and 90% (see Figure 6)
Output Signal Crossover Voltage
Min.
11.97
4
4
1.3
Typ.
Max.
12.03
20
20
2
Unit
Mbps
ns
ns
V
Figure 5 : Test Scheme for D+/D-
VREGD
Figure 6 : Rise and Fall Time Measures
D+ 2
D- 1
1.5kW
Test
27W
Test
27W
50pF
15kW 50pF
15kW
tR
90%
10%
tF
90%
10%
7/11
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