USB2SER Data Sheet, Rev. 0

Electrical Characteristics

Freescale Semiconductor

14

Appendix A Electrical Characteristics

This chapter contains electrical and timing specifications.

A.1

Parameter Classification

The electrical parameters shown in this supplement are guaranteed by various methods. To give the customer a better

understanding, the following classification is used and the parameters are tagged accordingly in the tables where appropriate:

NOTE

The above classifications are used in the column labeled C in applicable tables of this data

sheet.

A.2

Absolute Maximum Ratings

Absolute maximum ratings are only stress ratings. Functional operation at maximum is not guaranteed. Stress beyond the limits

specified in Table A-2 may affect the device reliability or cause permanent damage to the device. For functional operating

conditions, refer to the remaining tables in this section.

This device contains circuitry protecting against damage due to high static voltage or electrical fields. However, it is advised

that normal precautions be taken to avoid application of any voltages higher than the maximum-rated voltages to this high-

impedance circuit. Reliability of operation is enhanced if unused inputs are tied to an appropriate logic voltage level (for

1. Input must be current limited to the value specified. To determine the value of the required current-limiting resistor, calculate

resistance values for positive (VDD) and negative (VSS) clamp voltages, then use the larger of the two resistance values.

2. All functional non-supply pins are internally clamped to VSS and VDD.

Table A-1. Parameter classifications

P

Those parameters are guaranteed during production testing on each individual device.

C

Those parameters are achieved by the design characterization by measuring a statistically

relevant sample size across process variations.

T

Those parameters are achieved by design characterization on a small sample size from

typical devices under typical conditions unless otherwise noted. All values shown in the

typical column are within this category.

D Those parameters are derived mainly from simulations.

Table A-2. Absolute maximum ratings

Rating

Symbol

Value

Unit

Supply voltage

2.7 to 5.5

V

Input voltage

–0.3 to V

V

Instantaneous maximum current Single pin

I

D

± 25

mA

I

mA

Storage temperature

–55 to 150 ｰ

C

Maximum junction temperature

T

J

150 ｰ

C