HD74HC682/HD74HC684 8-bit Magnitude Comparator ADE-205-528 (Z) 1st. Edition Sep. 2000 Description These magnitude comparators perform comparisons of two eight-bit binary or BCD words. All types provide P=Q outputs and provide P>Q outputs. The HD74HC682 features 20 k pullup termination resistors on the Q inputs for analog or switch data. Type P=Q P>Q Output Enable 20 kΩ Pullup HD74HC682 Yes Yes No Yes HD74HC684 Yes Yes No No Features • • • • • High Speed Operation High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Input Data Outputs P, Q P=Q P>Q P=Q L H P>Q H L H H P<Q Note: 1. The P<Q function can be generated by applying the P=Q and P>Q Outputs to a 2-input NAND gate. HD74HC682/HD74HC684 Pin Arrangement HD74HC682/HD74HC684 P>Q 1 20 VCC P0 2 19 P=Q Q0 3 18 Q7 P1 4 17 P7 Q1 5 16 Q6 P2 6 15 P6 Q2 7 14 Q5 P3 8 13 P5 Q3 9 12 Q4 GND 10 11 P4 (Top view) 2 HD74HC682/HD74HC684 Logic Diagram HD74HC682/HD74HC684 P0 P=Q Q0 P1 Q1 VCC P2 Q2 P>Q P3 Q3 P4 Q4 VCC P5 Q5 P6 Q6 P7 Q7 VCC 3 HD74HC682/HD74HC684 DC Characteristics Ta = –40 to +85°C Ta = 25°C Item Symbol VCC (V) Min Typ Max Min Max Unit Input voltage VIH 2.0 1.5 — — 1.5 — V 4.5 3.15 — — 3.15 — 6.0 4.2 — — 4.2 — 2.0 — — 0.5 — 0.5 4.5 — — 1.35 — 1.35 6.0 — — 1.8 — 1.8 2.0 1.9 2.0 — 1.9 — 4.5 4.4 4.5 — 4.4 — 6.0 5.9 6.0 — 5.9 — 4.5 4.18 — — 4.13 — I OH = –4 mA 6.0 5.68 — — 5.63 — I OH = –5.2 mA 2.0 — 0.0 0.1 — 0.1 4.5 — 0.0 0.1 — 0.1 6.0 — 0.0 0.1 — 0.1 4.5 — — 0.26 — 0.33 I OL = 4 mA 6.0 — — 0.26 — 0.33 I OL = 5.2 mA VIL Output voltage VOH VOL Test Conditions V V V Vin = VIH or VIL I OH = –20 µA Vin = VIH or VIL I OL = 20 µA Input current (HC684) Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND Quiescent supply current (HC684) I CC 6.0 — — 4.0 40 µA Vin = VCC or GND, Iout = 0 µA Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC –0.6 –0.7 mA Iin = GND (HD682) Quescent supply current (HC682) 4 I CC 6.0 — — — 4.8 — 5.6 mA Qn = GND, other inputs = V CC or GND Iout = 0 µA — — 4.0 — 40 µA Qn = VCC, other inputs = V CC or GND Iout = 0 µA HD74HC682/HD74HC684 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = –40 to +85°C Ta = 25°C VCC (V) Min Typ Max Min Max Unit Test Conditions Propagation delay t PLH 2.0 — — 175 — 220 ns P or Q to P=Q time 4.5 — — 35 — 44 6.0 — — 30 — 37 t PLH 2.0 — — 200 — 250 ns P or Q to P>Q t PHL 4.5 — — 40 — 50 6.0 — — 34 — 43 Item Symbol t PHL Output rise/fall t TLH 2.0 — — 60 — 75 time t THL 4.5 — — 12 — 15 6.0 — — 10 — 13 — — 5 10 — 10 Input capacitance Cin ns pF 5 HD74HC682/HD74HC684 Package Dimensions Unit: mm 24.50 25.40 Max 1 7.00 Max 11 6.30 20 10 1.30 2.54 ± 0.25 0.48 ± 0.10 0.51 Min 1.27 Max 7.62 2.54 Min 5.08 Max 0.89 + 0.11 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Mass (reference value) DP-20N — Conforms 1.26 g Unit: mm 12.6 13 Max 11 1 10 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.10 ± 0.10 0.80 Max *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 5.5 20 0.20 7.80 +– 0.30 1.15 0° – 8° 0.70 ± 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension 6 Hitachi Code JEDEC EIAJ Mass (reference value) FP-20DA — Conforms 0.31 g HD74HC682/HD74HC684 Unit: mm 12.8 13.2 Max 11 1 10 0.20 ± 0.10 0.935 Max 1.27 *0.42 ± 0.08 0.40 ± 0.06 *0.27 ± 0.05 0.25 ± 0.04 2.65 Max 7.50 20 0.25 10.40 +– 0.40 1.45 0° – 8° 0.57 0.70 +– 0.30 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Mass (reference value) FP-20DB Conforms — 0.52 g 7 HD74HC682/HD74HC684 Cautions 1. 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Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor products. Hitachi, Ltd. Semiconductor & Integrated Circuits. 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