July 20 (Reuters) - U.S. stock index futures rose slightly on Monday, following last week's chip-stocks-led pullback, as investors awaited a key slate of earnings that could test Wall Street's AI-driven rally, while caution prevailed due to escalating tensions in the Middle East.

The second-quarter earnings season will pick up pace this week, with reports due from several major companies, including Alphabet, Tesla, Intel ( INTC ) and IBM ( IBM ).

Alphabet, one of the "Magnificent Seven" megacap stocks, is also a major AI hyperscaler, spending billions of dollars on data centers and related infrastructure.

That surge in AI capital spending has been a major driver behind this year's market gains, lifting semiconductor stocks and other companies that are seen as the beneficiaries of the buildout, and helping the major U.S. indexes hit record highs.

Earnings from Intel ( INTC ) and Texas Instruments ( TXN ) will be closely watched after a powerful rally in chip stocks gave way to a sharp reversal.

The Philadelphia SE Semiconductor Index ended Friday more than 20% below its late-June record high, confirming a bear-market decline.

"If earnings reports in the coming weeks suggest that we remain in the spend phase of the AI buildout, investors are likely to get more impatient, and the sell-off could drag on over the summer months," said Kathleen Brooks, research director at XTB.

At 05:18 a.m. ET, Dow E-minis were up 106 points, or 0.2%, and S&P 500 E-minis were up 16.5 points, or 0.22%. Nasdaq 100 E-minis were up 111.75 points, or 0.39%.

The three main U.S. indexes fell sharply last week, pressured by a steep pullback in high-flying semiconductor shares. The declines came even as benign inflation data eased some fears of a Federal Reserve rate increase later this month, while major U.S. banks kicked off earnings season on a positive note.

Markets are pricing in about a 12% chance of a quarter-point rate hike at the Fed's July meeting and a roughly 53% chance of another hike in September, according to CME's FedWatch tool.

Investors were closely watching the development in the U.S.-Israeli war with Iran after a recent escalation in the nearly five-month-old conflict.

U.S. forces struck Iran for a ninth consecutive day on Monday, raising concerns over shipping through the Strait of Hormuz.

The renewed tensions have fueled worries that energy prices could climb back toward levels seen at the start of the war, reviving inflation concerns.

Earlier in the day, Brent crude rose above $90 a barrel for the first time since early June.

"The escalations have also eroded the assumption that the crisis in the Middle East is over and energy prices would normalize," Brooks said.

(Reporting by Ragini Mathur in Bengaluru)