74HC688D,652
8-Bit Magnitude Comparator, SO20, –40 °C to +125 °C, T&R
Nexperia

1. Ordering Code Break-down• Full part number: 74HC688D,652• Device: 74HC688 (high-speed CMOS 8-bit comparator)• Package: D = SO20 (7.5 mm body width, SOT163-1)• Suffix “,652” indicates 1 000-piece 13-inch tape-and-reel (dry pack, Pb-free, RoHS)
2. General DescriptionCompares two 8-bit binary/BCD words and delivers a single “P=Q” output.Includes enable input (active-Low) and internal input-clamp diodes for easy interfacing to buses or higher-voltage drivers.
3. Key Features• Wide supply 2.0 V – 6.0 V (1.8 V input logic compatible at 3.3 V VCC)• CMOS low power: ICC typ 3.5 µA @ 25 °C, 6 V• High noise margin: 0.7 × VCC / 0.3 × VCC switching thresholds• Latch-up immunity > 100 mA per JESD 78 Class II Level B• ESD protection: HBM 2 kV, CDM 1 kV• Operating ambient –40 °C to +125 °C (automotive/industrial)• Propagation delay 29 ns max (6 V, 50 pF, –40 °C…+125 °C)• Power dissipation capacitance CPD 30 pF typical (used for dynamic-power estimate)
4. Pin Configuration (SO20 top view)1 E (enable, active-Low)2 P03 Q04 P15 Q16 P27 Q28 P39 Q310 GND11 P412 Q413 P514 Q515 P616 Q617 P718 Q719 P=Q (open-drain/comparator output)20 VCC
5. Functional Table (abridged)E=L, P[0:7]=Q[0:7] → P=Q=L (match)E=L, P≠Q → P=Q=H (no match)E=H → P=Q=H (disabled, high output)
6. Absolute Maximum Ratings• Supply voltage VCC –0.5 V … +7.0 V• Input voltage –0.5 V … VCC+0.5 V (±20 mA clamp current)• Output current ±25 mA per pin, ±50 mA total supply/ground• Power dissipation 500 mW @ Tamb=40 °C; derates 12.3 mW/K above 109 °C (SO20)• Storage temperature –65 °C … +150 °C
7. Recommended Operating Conditions• VCC 2.0 V … 6.0 V• Input rise/fall rate 625 ns/V max @ 2 V, 83 ns/V max @ 6 V• Tamb –40 °C … +125 °C
8. Static Characteristics (VCC=4.5 V unless noted)• VIH 3.15 V min; VIL 1.35 V max• VOH 4.4 V min @ –20 µA, 3.7 V min @ –4 mA• VOL 0.1 V max @ 20 µA, 0.4 V max @ 4 mA• Input leakage ±1 µA max• ICC 80 µA max (6 V, 25 °C), 160 µA max (125 °C)
9. Dynamic Characteristics (CL=50 pF)• tPD (Pn,Qn→P=Q) 43 ns max @ 4.5 V, –40…+85 °C• tPD (E→P=Q) 30 ns max under same conditions• Output transition time 22 ns max @ 4.5 V
10. Package & Shipping Details• 20-pin SO, 7.5 mm body, 2.65 mm max height, 1.27 mm pitch• MSL-1, 260 °C peak reflow, Pb-free, RoHS & REACH compliant• Reel Ø 330 mm, 1 000 pcs/reel, antistatic dry pack
11. Applications• Address recognition in memory modules• Board-ID / plug-in card detection• Micro-controller port comparison• Security-key comparison• Cascadable to 16-, 24-, 32-bit etc. (use P=Q outputs to drive next E pin)
12. Handling & Shelf-Life• Store ≤ 30 °C / ≤ 70 %RH, factory floor-life unlimited (MSL-1)• ESD sensitivity: handle at static-safe workstation