High-speed comparator for clock-distribution and threshold-detection paths
The ADCMP551BRQZ-REEL7 is a dual comparator with latch from Analog Devices, built for applications where propagation delay and output logic family determine the signal-chain timing budget. Its 0.625 ns max propagation delay makes it suitable for clock-recovery circuits, oversampling threshold detectors, and high-speed line receivers where the decision window is measured in hundreds of picoseconds. The outputs are complementary, differential LVPECL and open-emitter PECL, which interface directly with PECL/LVPECL logic families without external level translation.
Timing margin and signal integrity at the comparator node
The 0.625 ns propagation delay is the time from the input crossing the threshold to the output crossing the PECL switching point. In a clock-distribution tree, this delay adds to the total skew budget; the dual-channel package keeps the delay matched between channels to within a few picoseconds, which matters for differential clock fan-out. Typical CMRR is 76 dB and PSRR is 75 dB, meaning the comparator rejects common-mode noise and supply ripple well enough to maintain threshold accuracy in noisy digital environments. The 10 mV max input offset voltage sets the DC accuracy floor — for a 100 mV reference threshold, the offset contributes 10 % uncertainty, so the reference should be scaled accordingly. The latch function (Type: with Latch) holds the output state on the latch-enable signal, which is useful in sampled-data systems where the comparator decision must be captured at a specific clock edge. The 17 mA max quiescent current per package is moderate for a dual PECL-output comparator — the LVPECL output stage draws most of that current, so the thermal rise in the 16-QSOP package stays manageable at room temperature.
Package and board integration for the 16-QSOP footprint
The QSOP is a narrower body than the standard SSOP — the 0.154-inch width means the footprint is tighter, so the decoupling capacitors should be placed on the back side or within the pad ring to keep the supply bypass loop short. Surface-mount assembly with Tape & Reel packaging (REEL7 suffix) is standard for automated pick-and-place.
Active lifecycle and compliance posture
For a procurement desk sourcing this part, the active status means the authorized channel is the normal route. The REEL7 suffix indicates Tape & Reel packaging — the same die in tube packaging is available as ADCMP551BRQZ, which is the identical device in a different shipping format. Both share the same electrical specifications and footprint.