PIC18F2455T-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2455T-I/ML

28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

Microchip 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

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