UM3221E/UM3222E/UM3232E Fail-Safe, Single Supply .
Union Semiconductor
UM3232E - Single Supply RS-232 Transceivers
UM3221E/UM3222E/UM3232E Fail-Safe, Single Supply RS-232 Transceivers UM3221E/UM3222E/UM3232E General Description The UM3221E/UM3222E/UM3232E series.