HCS08 datasheet(173/198 Pages) NXP

173 / 198 page

MC9S08QD4 Series MCU Data Sheet, Rev. 6

Freescale Semiconductor

173

Appendix A

Electrical Characteristics

A.1

Introduction

This chapter contains electrical and timing specifications.

A.2

Absolute Maximum Ratings

Absolute maximum ratings are stress ratings only, and functional operation at the maxima is not

guaranteed. Stress beyond the limits specified in Table A-1 may affect 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

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 instance, either VSS or VDD) or the programmable

pull-up resistor associated with the pin is enabled.

Table A-1. Absolute Maximum Ratings

Rating

Symbol

Value

Unit

Supply voltage

VDD

–0.3 to +5.8

Maximum current into VDD

IDD

120

Digital input voltage

VIn

–0.3 to VDD +0.3

Instantaneous maximum current

Single pin limit (applies to all port pins)1, 2, 3

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 V

SS and VDD.

3 Power supply must maintain regulation within operating V

DD range during instantaneous and

operating maximum current conditions. If positive injection current (VIn > VDD) is greater than

IDD, the injection current may flow out of VDD and could result in external power supply going

out of regulation. Ensure external VDD load will shunt current greater than maximum injection

current. This will be the greatest risk when the MCU is not consuming power. Examples are: if

no system clock is present, or if the clock rate is very low (which would reduce overall power

consumption).

±25

Storage temperature range

Tstg

–55 to 150

°C

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