PIC18F2455_09 Datasheet, PDF (385/438 Pages) Microchip Technology – 28/40/44-Pin,High-Performance,Enhanced Flash,USB Microcontrollers with nanoWatt Technology

PIC18F2455/2550/4455/4550
TABLE 28-4: USB MODULE SPECIFICATIONS
Operating Conditions: -40°C < TA < +85°C (unless otherwise stated).
Param
No.
Sym
Characteristic
Min Typ Max
D313 VUSB USB Voltage
3.0
—
3.6
D314 IIL
Input Leakage on D+ and D- —
—
±1
pins
D315 VILUSB Input Low Voltage for USB
—
—
0.8
Buffer
D316 VIHUSB Input High Voltage for USB
2.0
—
—
Buffer
D317 VCRS Crossover Voltage
1.3
2.0
D318 VDIFS Differential Input Sensitivity
—
—
0.2
D319 VCM Differential Common Mode
0.8
—
2.5
Range
D320 ZOUT Driver Output Impedance
28
—
44
D321 VOL Voltage Output Low
0.0
—
0.3
D322 VOH Voltage Output High
2.8
—
3.6
Units
Comments
V Voltage on pin must be in this
range for proper USB
operation
μA VSS ≤ VPIN ≤ VDD;
pin at high-impedance
V For VUSB range
V For VUSB range
V Voltage range for D+ and D-
crossover to occur
V The difference between D+
and D- must exceed this value
while VCM is met
V
Ω
V 1.5 kΩ load connected to 3.6V
V 15 kΩ load connected to
ground
TABLE 28-5: USB INTERNAL VOLTAGE REGULATOR SPECIFICATIONS
Operating Conditions: -40°C < TA < +85°C (unless otherwise stated).
Param
No.
Sym
Characteristics
Min Typ Max Units
Comments
D323
D324
VUSBANA Regulator Output Voltage
CUSB
External Filter Capacitor
Value (VUSB to VSS)
3.0
0.22
—
0.47
3.6
12⁽²⁾
V VDD > 4.0V⁽¹⁾
μF Ceramic or other low-ESR
capacitor recommended
Note 1:
2:
If device VDD is less than 4.0V, the internal USB voltage regulator should be disabled and an external
3.0-3.6V supply should be provided on VUSB if the USB module is used.
This is a recommended maximum for start-up time and in-rush considerations. When the USB regulator is
disabled, there is no maximum.
© 2009 Microchip Technology Inc.
DS39632E-page 383