  We present a time-over-threshold readout technique to count the number of
activated pixels from an array of superconducting nanowire single photon
detectors (SNSPDs). This technique maintains the intrinsic timing jitter of the
individual pixels, places no additional heatload on the cryostat, and retains
the intrinsic count rate of the time-tagger. We demonstrate proof-of-principle
operation with respect to a four-pixel device. Furthermore, we show that, given
some permissible error threshold, the number of pixels that can be reliably
read out scales linearly with the intrinsic signal-to-noise ratio of the
individual pixel response.
