The HP / Agilent 16557D is a 68 Channel State / Timing Analysis Card for 16500x / 1660xx / 16700x series analyzers. Maximum Clock: 135 MHz state, 500 MHz timing, Memory: 2M/channel, Misc: Up to 5 cards can be connected together for 340 channels. In half channel mode, memory can be interlaced for 4M/channel. Application may require preprocessor.