375 ps — what that delay means for your signal chain
The ADCMP565BPZ is Analog Devices' dual ultra-fast comparator with a maximum propagation delay of 0.375 ns (375 ps). That places it in the class of comparators used for time-of-flight measurements, high-speed line receivers, and pulse-width discriminator front-ends where a few hundred picoseconds of skew can flip a bit. The 375 ps figure is the max over temperature and supply, not a typical — the 20-PLCC package adds about 50 ps of trace delay per side from the bond wire, so factor that into your timing budget if the output drives a distant line.
ECL outputs — termination is not optional
The output type is complementary, differential, ECL, open-emitter. That means the outputs are emitter-follower stages that need a pull-down resistor to the negative supply rail (typically -2 V or ground-referenced with a Thevenin termination). No internal pull-up exists — leave the emitter open and the output floats high. The 30 mA typical output current drives 50 Ω loads into -2 V cleanly. If your design expects a TTL or LVCMOS level, this part requires a translator or a PECL termination network to shift the levels. The latch input holds the state on the rising edge of the latch-enable pin; leave it unconnected or tie high for transparent mode.
Supply rails and quiescent budget
The quiescent current splits into two rails: 18 mA on one, 80 mA on the other (the ECL output stage draws the larger share). Total around 98 mA worst-case, which is modest for a dual 375 ps comparator but not a low-power part. The ±1 mV hysteresis is built in, so you do not need external positive feedback resistors to clean up noisy edges. Input offset voltage maxes at 6 mV at 5 V supply, and input bias current at 40 µA — both typical for a high-speed bipolar comparator. CMRR is 69 dB typical.
Package and rework profile
The 20-PLCC (J-lead) package is a known quantity — no BGA reball or hot-air profile guesswork. The leads are on the perimeter, visible for inspection, and the J-lead form is forgiving of board flex. The 9x9 mm body in the supplier device package field matches the industry-standard PLCC-20 footprint. The mounting type is surface mount, and the shipping medium is tube, not tape and reel.