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| OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS The SN54 / 74LS240, 241 and 244 are Octal Buffers and Line Drivers designed to be employed as memory address drivers, clock drivers and bus-oriented transmitters/receivers which provide improved PC board density. SN54/74LS240 SN54/74LS241 SN54/74LS244 OCTAL BUFFER / LINE DRIVER WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY * Hysteresis at Inputs to Improve Noise Margins * 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers * Input Clamp Diodes Limit High-Speed Termination Effects LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) SN54 / 74LS240 VCC 2G 20 19 1Y1 18 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1 17 16 15 14 13 12 11 20 1 J SUFFIX CERAMIC CASE 732-03 20 1 N SUFFIX PLASTIC CASE 738-03 1 1G 2 1A1 3 4 5 2Y4 1A2 2Y3 6 8 9 10 7 1A3 2Y2 1A4 2Y1 GND 20 1 SN54 / 74LS241 VCC 2G 20 19 1Y1 18 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1 17 16 15 14 13 12 11 DW SUFFIX SOIC CASE 751D-03 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC 1 1G 2 1A1 3 4 5 2Y4 1A2 2Y3 6 8 9 10 7 1A3 2Y2 1A4 2Y1 GND SN54 / 74LS244 VCC 2G 20 19 1Y1 18 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1 17 16 15 14 13 12 11 1 1G 2 1A1 3 4 5 2Y4 1A2 2Y3 8 9 10 6 7 1A3 2Y2 1A4 2Y1 GND FAST AND LS TTL DATA 5-1 SN54/74LS240 * SN54/74LS241 * SN54/74LS244 TRUTH TABLES SN54 / 74LS240 INPUTS OUTPUT 1G, 2G L L H D L H X H L (Z) 1G, 2G L L H D L H X L H (Z) SN54 / 74LS244 INPUTS OUTPUT SN54 / 74LS241 INPUTS 1G L L H D L H X OUTPUT 2G L H (Z) H H L D L H X L H (Z) INPUTS OUTPUT H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = HIGH Impedance GUARANTEED OPERATING RANGES Symbol VCC TA IOH Supply Voltage Operating Ambient Temperature Range Output Current -- High Parameter 54 74 54 74 54, 74 54 74 IOL Output Current -- Low 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 3.0 - 12 - 15 12 24 Unit V C mA mA mA FAST AND LS TTL DATA 5-2 SN54/74LS240 * SN54/74LS241 * SN54/74LS244 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VT+-VT- VIK VOH Parameter P Input HIGH Voltage 54 Input LOW Voltage 74 Hysteresis Input Clamp Diode Voltage 54, 74 Output HIGH Voltage 54, 74 54, 74 VOL IOZH IOZL IIH IIL IOS Output LOW Voltage 74 Output Off Current HIGH Output Off Current LOW Input HIGH Current 0.1 Input LOW Current Output Short Circuit Current (Note 1) Power Supply Current Total, Output HIGH Total, Output LOW ICC Total at HIGH Z LS240 LS241/244 LS240 LS241/244 - 40 - 0.2 - 225 27 44 46 50 54 A mA VCC = MAX 0.35 0.5 20 - 20 20 V A A A mA mA mA 2.0 0.25 0.4 V V 2.4 0.2 0.4 - 0.65 3.4 - 1.5 0.8 V V V Min 2.0 0.7 V Typ Max Unit Ui V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = - 3.0 mA VCC = MIN, IOH = MAX IOL = 12 mA IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VOUT = 2.7 V VCC = MAX, VOUT = 0.4 V VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) Limits Symbol S bl tPLH tPHL tPLH tPHL tPZH tPZL tPLZ tPHZ Parameter P Propagation Delay, Data to Output LS240 Propagation Delay, Data to Output LS241 / 244 Output Enable Time to HIGH Level Output Enable Time to LOW Level Output Disable Time from LOW Level Output Disable Time from HIGH Level Min Typ 9.0 12 12 12 15 20 15 10 Max 14 18 18 18 23 30 25 18 Unit Ui ns ns ns ns ns ns CL = 5.0 p , pF, RL = 667 CL = 45 pF, F RL = 667 Test C di i T Conditions FAST AND LS TTL DATA 5-3 SN54/74LS240 * SN54/74LS241 * SN54/74LS244 AC WAVEFORMS VIN 1.3 V tPLH 1.3 V tPHL 1.3 V VCC RL SW1 VOUT 1.3 V Figure 1 TO OUTPUT UNDER TEST VIN 1.3 V tPHL VOUT 1.3 V 1.3 V tPLH 1.3 V CL* 5 k SW2 Figure 2 VE VE VOUT 1.3 V tPZL 1.3 V 1.3 V tPLZ 1.3 V VOL 0.5 V SYMBOL tPZH tPZL tPLZ tPHZ SWITCH POSITIONS SW1 Open Closed Closed Closed SW2 Closed Open Closed Closed Figure 3 Figure 5 VE 1.3 V VE VOUT tPZH 1.3 V 1.3 V tPHZ VOH 1.3 V 0.5 V Figure 4 FAST AND LS TTL DATA 5-4 |
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