Tisha Campbell-Martin Wants Custody Deal with Estranged Husband in Writing

"Martin" star Tisha Campbell-Martin says her estranged hubby has gone rogue on their verbal custody deal, and wants a judge to hammer out an official one and force him to stick to it.

The actress -- who played Martin Lawrence's wife on the hit '90s sitcom -- filed new court docs in her divorce case claiming Duane Martin has been terrible at communicating about their 2 boys. The exes currently have 50-50 custody.

In the docs, obtained by TMZ, she says Duane will often not respond to her nor cooperate on previously agreed upon swap times for the kids -- adding that he also threatens to keep their sons beyond his allotted dad time.

Tisha is asking a judge to put a 50-50 custody deal in writing with an alternating weekly schedule and a neutral exchange location ... like a police station, she suggests.