We present a 3-D range map acquisition system using a gray-encoded time-multiplexing structured pattern. In this method the only information needed to reconstruct 3-D range map is whether the pixel is bright or not for the exposed structured patterns. A dedicated image sensor to capture the pattern consists of pixel parallel 1-bit A/D converter, in-pixel pattern address memory and column parallel digital pattern address readout circuit. This in-pixel memory and digital bit-parallel pattern address readout eliminate unnecessary readout of pattern data to enhance 3-D acquisition speed. We fabricated the image sensor in 0.18 µm CMOS and demonstrated up to 122 range map per second 3-D range map acquisition performance for 7 patterns with the average error of 3.2 mm under the condition of 10% pattern recognition error.