  The Cherenkov Imaging Telescope Integrated Read Out Chip, CITIROC, is a chip
adopted as the front-end of the camera at the focal plane of the imaging
Cherenkov ASTRI dual-mirror small size telescope (ASTRI SST-2M) prototype. This
paper presents the results of the measurements performed to characterize
CITIROC tailored for the ASTRI SST-2M focal plane requirements. In particular,
we investigated the trigger linearity and efficiency, as a function of the
pulse amplitude. Moreover, we tested its response by performing a set of
measurements using a silicon photomultiplier (SiPM) in dark conditions and
under light pulse illumination. The CITIROC output signal is found to vary
linearly as a function of the input pulse amplitude. Our results show that it
is suitable for the ASTRI SST-2M camera.

Instrumentation and Detectors