AC244 ACT244 54AC/74AC244 54ACTI74ACT244 Octal Buffer/Line Driver With 3-State Outputs Description The ACPACT244 is an octal buffer and line driver designed to be employed as a memory address driver, clock driver and bus-oriented transmitter/receiver which provides improved PC board density. 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers * Outputs Source/Sink 24 mA "ACT244 has TTL-Compatible Inputs Truth Tables Connection Diagrams OE GND Inputs Outputs OE; D (Pins 12, 14, 16, 18) Pin Assignment L L L for DIP, Flatpak and SOIC | L H H i) H x zZ Sew = Inputs Outputs , : {3] & OE2 D (Pins 3, 5, 7, 9) ~ GND {10) 4 [2 L L L fr] [it GE: L H H aq 20 Vec H Xx z w fig Gez H=HIGH Voltage Level PUA L=LOW Voltage Level m4 ff 6 7 3B X = Immaterial Z=High Impedance Pin Assignment for LCC DC Characteristics (unless otherwise specified) Symbol Parameter 54AC/IACT 74ACIACT Units Conditions Vin = Vcc or Maximum Quiescent Ground, loc Supply Current 160 80 HA Vec=5.5 V, Ta=Worst Case Vin = Vcc or Maximum Quiescent Ground, Ice Supply Current 8.0 8.0 HA Voc = 5.5 V, Ta = 25C . oa: VIN = Vcc-2.1 V Ico eolnput (ACT244) 16 15 mA | Voc=5.5V, cerinpu Ta = Worst Case 5-115 AC244 ACT244 AC Characteristics 74AC 54AC 74AC Ta= 55C | Ta= ~ 40C _ a, Symbol Parameter Vec* Oates to +125C | to +85C | Units | Fig. (Vv) =ouP CL.=50 pF | CL=50 pF No. Min Typ Max | Min Max | Min Max tPLH Propagation Delay 3.3 1.0 6.5 9.0 1.0 12.5 1.0 10.0 ns 3.5 Data to Output 5.0] 1.0 5.0 7.0 | 1.0 95 | 1.0 7.5 teu Propagation Delay 3.3 1.0 6.5 9.0 1.0 12.0 1.0 10.0 ns 3.5 Data to Output 50] 1.0 5.0 7.0 | 1.0 9.0 | 1.0 7.5 . 33/10 60 105] 10 115/10 11.0 tPzH Output Enable Time 50} 10 50 70/10 90/10 #80] | 7 . 33] 10 75 100/10 130] 10 110 trzt Output Enable Time 50| 10 55 80/10 105/10 285| | 38 . . 33 | 10 70 100] 10 125] 10 105 tpHz Output Disable Time 50} 10 65 90] 10 105] 10 95] | 37 . . 33 | 10 75 105] 10 130] 10 115 triz Output Disable Time 50/10 65 90/10 110/10 o95| "S | 38 *Voltage Range 3.3 is 3.3 V+0.3 V Voltage Range 5.0 is 50 V+0.5 V AC Characteristics 74ACT 54ACT 74ACT Ta= 55C | Ta= 40C _ o Symbol Parameter Vec* oat to +125C | to +85C | Units | Fig. (Vv) =oue CL=50 pF | CL=50 pF No. Min Typ Max | Min Max | Min Max Propagation Delay tPLH Data to Output 5.0 | 1.0 6.5 9.0 1.0 10.0 1.0 10.0 ns 3-5 tPHL Date te Output 50 | 10 70 90/140 100110 100] ns | 36 tPzH Output Enable Time 5.0 1.0 6.0 8.5 1.0 9.5 1.0 9.5 ns 3-7 tpze Output Enable Time 5.0 1.0 7.0 9.5 1.0 11.0 1.0 10.5 ns 3-8 tPHz Output Disable Time 5.0 1.0 7.0 9.5 1.0 11.0 1.0 10.5 ns 3-7 tPLz Output Disable Time 5.0 1.0 7.5 10.0 1.0 11.5 | 1.0 10.5 ns 3-8 *Voltage Range 5.0 is 5.0 V+0.5V Military parameters given herein are for general references only. For current military specifications and subgroup testing information please request Fairchild's Table | data sheet from your Fairchild saies engineer or account representative. ee 5-116 AC244 ACT244 Capacitance 54/74AC/ACT Symbol Parameter Units Conditions Typ Cin Input Capacitance 4.5 pF Vcc =5.5 V Power Dissipation _ Cpp Capacitance 45.0 pF Vec=5.5 V 5-117