Datasheet

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