STPCINDUSTRIAL datasheet(34/55 Pages) STMICROELECTRONICS

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ELECTRICAL SPECIFICATIONS

34/55

Issue 1.1

4 ELECTRICAL SPECIFICATIONS

4.1 INTRODUCTION

The electrical specifications in this chapter are

valid for the STPC Industrial.

4.2 ELECTRICAL CONNECTIONS

4.2.1 Power/Ground Connections/Decoupling

Due to the high frequency of operation of the

STPC Industrial, it is necessary to install and test

this

device

using

standard

high

frequency

techniques. The high clock frequencies used in

the STPC Industrial and its output buffer circuits

can cause transient power surges when several

output buffers switch output levels simultaneously.

These effects can be minimized by filtering the

DC power leads with low-inductance decoupling

capacitors, using low impedance wiring, and by

utilizing all of the VSS and VDD pins.

4.2.2 Unused Input Pins

All inputs not used by the designer and not listed

in the table of pin connections in Section 3 should

be connected either to VDD or to VSS. Connect

active-high inputs to VDD through a 20 k

Ω

(

±10%) pull-down resistor and active-low inputs to

VSS and connect active-low inputs to VCC

through a 20 k

Ω (±10%) pull-up resistor to prevent

spurious operation.

4.2.3 Reserved Designated Pins

Pins

designated

reserved

should

left

disconnected. Connecting a reserved pin to a

pull-up resistor, pull-down resistor, or an active

signal could cause unexpected results

and

possible circuit malfunctions.

4.3 ABSOLUTE MAXIMUM RATINGS

The following table lists the absolute maximum

ratings for the STPC Industrial device. Stresses

beyond those listed under Table 4-1 limits may

cause permanent damage to the device. These

are stress ratings only and do not imply that

operation under any conditions other than those

specified in section ”Operating Conditions”.

Exposure to conditions beyond those outlined in

Table 4-1 may (1) reduce device reliability and (2)

result in premature failure even when there is no

immediately apparent sign of failure. Prolonged

exposure to conditions at or near the absolute

maximum ratings (Table 4-1) may also result in

reduced useful life and reliability.

4.3.1 5V Tolerance

The STPC is capable of running with I/O systems

that operate at 5V such as PCI and ISA devices.

Certain pins of the STPC tolerate inputs up to

5.5V. Above this limit thecomponent is likely to

sustain permanent damage.

All the pin that are V5T have been denoted with a

* besides the Signal Name in Table 3-1 .

Table 4-1. Absolute Maximum Ratings

Symbol

Parameter

Minimum

Maximum

Units

VDDx

DC Supply Voltage

-0.3

4.0

VI,VO

Digital Input and Output Voltage

-0.3

VDD + 0.3

V5T

5Volt Tolerance

2.5

5.5

TSTG

Storage Temperature

-40

+150

°C

TOPER

Operating Temperature

+70

°C

PTOT

Maximum Power Dissipation

4.8

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