does this affect global ranking

Geotargetable domains

Generic top-level domains (gTLDs) don't target specific countries. If your site has a generic top-level domain, such as .com, .org, or any of the domains listed below, and targets users in a particular geographic location, you can provide us with information that will help us determine how your site appears in our search results. More information about geotargeting URLs.

Google treats the following as gTLDs that can be geotargeted in Webmaster Tools.

Generic Top Level Domains (gTLDs)

.aero
.biz
.cat
.com
.coop
.edu
.gov
.info
.int
.jobs
.mil
.mobi
.museum
.name
.net
.org
.pro
.tel
.travel
Regional top-level domains

Although these domains are associated with a geographical region, they are generally treated as generic top-level domains (much like .com or .org).

.eu
.asia
Generic Country Code Top Level Domains

Google treats some ccTLDs (such as .tv, .me, etc.) as gTLDs, as we've found that users and webmasters frequently see these more generic than country-targeted. Here is a list of those ccTLDs (note that this list may change over time).

.ad
.as
.bz
.cc
.cd
.co
.dj
.fm
.io
.la
.me
.ms
.nu
.sc
.sr
.su
.tv
.tk
.ws

Source
https://support.google.com/webmaster.../1347922?hl=en

If its not one of these, then yes it will.

Its always better go with gTLD, if you use ccTLD . Your ccTLD and rank well only if the site is having good PR,Authority etc. having backlinks at global level. Eg. "bulk backlink" check in google.com will give a .in domain - backlinks. in @ Rank 5