Let p, q be two distinct odd primes, and let m, n be non-negative integers. We consider a family of binary sequences defined by generalized cyclotomic classes modulo p^(m+1) q^(n+1). The first contribution is to determine their linear complexity, which improves certain results of Hu, Yue and Wang. The second contribution is to compute the autocorrelation values. Results obtained indicate that such sequences are 'good' from the viewpoint of cryptography.