HD74AC244/HD74ACT244 Octal Buffer/Line Driver with 3-State Output Description The HD74AC244/HD74ACT244 is an octal buffer and line driver designed to be employed as a memory address driver, clock driver and bus-oriented transmitter/receive which provides improved PC board density. Features • 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers • Outputs Source/Sink 24 mA • HD74ACT244 has TTL-Compatible Inputs Pin Arrangement OE1 1 20 VCC 2 19 OE2 3 18 4 17 5 16 6 15 7 14 8 13 9 12 GND 10 11 (Top view) HD74AC244/HD74ACT244 Truth Tables Inputs OE1 D Outputs (Pins 12, 14, 16, 18) L L L L H H H X Z OE2 D Outputs (Pins 3, 5, 7, 9) L L L L H H H X Z Inputs H L X Z : : : : High Voltage Level Low Voltage Level Immaterial High Impedance DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current I CC 80 µA VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current I CC 8.0 µA VIN = VCC or ground, VCC = 5.5 V, Ta = 25°C Maximum additional ICC/input (HD74ACT244) I CCT 1.5 mA VIN = VCC – 2.1 V, VCC = 5.5 V, Ta = Worst case 2 HD74AC244/HD74ACT244 AC Characteristics: HD74AC244 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay t PLH 3.3 1.0 6.5 9.0 1.0 10.0 ns 5.0 1.0 5.0 7.0 1.0 7.5 3.3 1.0 6.5 9.0 1.0 10.0 5.0 1.0 5.0 7.0 1.0 7.5 3.3 1.0 6.0 10.5 1.0 11.0 5.0 1.0 5.0 7.0 1.0 8.0 3.3 1.0 7.5 10.0 1.0 11.0 5.0 1.0 5.5 8.0 1.0 8.5 3.3 1.0 7.0 10.0 1.0 10.5 5.0 1.0 6.5 9.0 1.0 9.5 3.3 1.0 7.5 10.5 1.0 11.5 5.0 1.0 6.5 9.0 1.0 9.5 Data to output Propagation delay t PHL Data to output Output enable time Output enable time Output disable time Output disable time Note: t PZH t PZL t PHZ t PLZ ns ns ns ns ns 1. Voltage Range 3.3 is 3.3 V ± 0.3 V Voltage Range 5.0 is 5.0 V ± 0.5 V AC Characteristics: HD74ACT244 Ta = +25°C CL = 50 pF Ta = –40°C to +85°C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay Data to output t PLH 5.0 1.0 6.5 9.0 1.0 10.0 ns Propagation delay Data to output t PHL 5.0 1.0 7.0 9.0 1.0 10.0 ns Output enable time t PZH 5.0 1.0 6.0 8.5 1.0 9.5 ns Output enable time t PZL 5.0 1.0 7.0 9.5 1.0 10.5 ns Output disable time t PHZ 5.0 1.0 7.0 9.5 1.0 10.5 ns Output disable time t PLZ 5.0 1.0 7.5 10.0 1.0 10.5 ns Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V 3 HD74AC244/HD74ACT244 Capacitance Item Symbol Typ Unit Condition Input capacitance CIN 4.5 pF VCC = 5.5 V Power dissipation capacitance CPD 45.0 pF VCC = 5.0 V 4 Unit: mm 24.50 25.40 Max 6.30 11 1 7.00 Max 20 10 1.30 2.54 ± 0.25 0.48 ± 0.10 0.51 Min 1.27 Max 2.54 Min 5.08 Max 0.89 7.62 + 0.11 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (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 Hitachi Code JEDEC EIAJ Weight (reference value) FP-20DA — Conforms 0.31 g 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 Weight (reference value) FP-20DB Conforms — 0.52 g Unit: mm 6.50 6.80 Max 11 1 10 4.40 20 0.65 *0.22+0.08 –0.07 0.20 ± 0.06 1.0 0.13 M 6.40 ± 0.20 *Dimension including the plating thickness Base material dimension 0.07 +0.03 –0.04 0.10 *0.17 ± 0.05 0.15 ± 0.04 1.10 Max 0.65 Max 0° – 8° 0.50 ± 0.10 Hitachi Code JEDEC EIAJ Weight (reference value) TTP-20DA — — 0.07 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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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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