HD74HC678 16-bit Address Comparator Description The HD74HC678 address comparator simplifies addressing of memory boards and/or other peripheral devices. The four P inputs are normally hard wired with a preprogrammed address. An internal decoder determines what input information applied to the 16 A inputs must be low or high to cause a low state at the output (Y). For example, a positive-logic bit combination of 0111 (decimal 7) at the P input determines that inputs A1 through A7 must be low and that inputs A8 through A16 must be high to cause the output to go low. Equality of the address applied at the A inputs to the preprogrammed address is indicated by the output being low. The HD74HC678 features a transparent latch and a latch enabled input (C). When C is high, the device is in the transparent mode. When C is low, the previous logic state of Y is latched. 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) HD74HC678 Function Table Inputs C P3 P2 P1 P0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 Output Y H L L L L H H H H H H H H H H H H H H H H L H L L L H L H H H H H H H H H H H H H H H L H L L H L L L H H H H H H H H H H H H H H L H L L H H L L L H H H H H H H H H H H H H L H L H L L L L L L H H H H H H H H H H H H L H L H L H L L L L L H H H H H H H H H H H L H L H H L L L L L L L H H H H H H H H H H L H L H H H L L L L L L L H H H H H H H H H L H H L L L L L L L L L L L H H H H H H H H L H H L L H L L L L L L L L L H H H H H H H L H H L H L L L L L L L L L L L H H H H H H L H H L H H L L L L L L L L L L L H H H H H L H H H L L L L L L L L L L L L L L H H H H L H H H L H L L L L L L L L L L L L L H H H L H H H H L L L L L L L L L L L L L L L H H L H H H H H L L L L L L L L L L L L L L L H L H All other combinations H L Any combination Latched 2 HD74HC678 Pin Arrangement A1 1 24 VCC A2 2 23 C A3 3 22 Y A4 4 21 P3 A5 5 20 P2 A6 6 19 P1 A7 7 18 P0 A8 8 17 A16 A9 9 16 A15 A10 10 15 A14 A11 11 14 A13 GND 12 13 A12 (Top view) 3 HD74HC678 Logic Diagram C A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 CK A12 IN A13 A14 A15 A16 P0 P1 P2 P3 4 Q Y HD74HC678 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 Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND Quiescent supply current I CC 6.0 — — 4.0 40 µA Vin = VCC or GND, Iout = 0 µA — 5 HD74HC678 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 — — 330 — 410 ns P to Y time 4.5 — 30 66 — 82 6.0 — — 56 — 70 t PLH 2.0 — — 210 — 265 ns A to Y t PHL 4.5 — 21 42 — 53 6.0 — — 36 — 45 t PLH 2.0 — — 150 — 190 ns C to Y t PHL 4.5 — 13 30 — 38 6.0 — — 26 — 33 2.0 100 — — 125 — ns A to C 4.5 20 12 — 25 — 6.0 17 — — 21 — Item Setup time Symbol t PHL t su Output rise/fall t TLH 2.0 — — 75 — 95 time t THL 4.5 — — 15 — 19 6.0 — — 13 — 16 — — 5 10 — 10 Input capacitance 6 Cin ns pF Unit: mm 13 13.4 15.0 Max 24 31.6 32.5 Max 12 1.2 15.24 0.48 ± 0.10 0.51 Min 2.54 ± 0.25 5.70 Max 2.13 Max 2.54 Min 1 + 0.11 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-24 Conforms Conforms 3.1 g Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. 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