be careful there. Several points to keep in mind
(1) DV is a deportable offense as long as it meet the defnition in section 16 of title 18, United States Code)
(2) If (1) is there, sentence does not matter. Unlike the immigration laws requireing at least 1 year maximum sentence to be deportabel for CIMT, there is no minimum sentence reruiredment for DV top be deportable
(3) For the deportation purpose, plead guilty/no contest will be teh same as conviction even if the case is dimissed later
(4) If deportable based on DV is really in-evitable, the offenders can re-immigrate as long as no CIMT or aggravated felony
is not attached to DV since in this case DV is only deportable offense not an inadmissible offense.
So you should avoid falling into deportable category. This is most important. If the charge is not deportable or reduced to
non-deportable, then a conviction can still affect citizenship for 5 years but will not make your husband deportable.
http://www.uscis.gov/ilink/docView/SLB/HTML/SLB/0-0-0-1/0-0-0-29/0-0-0-5667.html
(i) Domestic violence, stalking, and child abuse.-Any alien who at any time after admission is convicted of a crime of domestic violence, a crime of stalking, or a crime of child abuse, child neglect, or child abandonment is deportable. For purposes of this clause, the term "crime of domestic violence" means any crime of violence (as defined in section 16 of title 18, United States Code) against a person committed by a current or former spouse of the person, by an individual with whom the person shares a child in common, by an individual who is cohabiting with or has cohabited with the person as a spouse, by an individual similarly situated to a spouse of the person under the domestic or family violence laws of the jurisdiction where the offense occurs, or by any other individual against a person who is protected from that individual's acts under the domestic or family violence laws of the United States or any State, Indian tribal government, or unit of local government.