74LS540-1 SYC | Alldatasheet

Document overview

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Technical content

The SN54/74LS540 and SN54/74LS541 are octal buffers and line drivers with the same functions as the LS240 and LS241, but with pinouts on the opposite side of the package. These device types are designed to be used as memory address drivers, clock drivers and bus-oriented transmitters/receivers. These devices are especially useful as output ports for the microprocessors, allowing ease of layout and greater PC board density.

  • Hysteresis at Inputs to Improve Noise Margin
  • PNP Inputs Reduce Loading
  • 3-State Outputs Drive Bus Lines
  • Inputs and Outputs Opposite Side of Package, Allowing Easier Interface to Microprocessors
  • Input Clamp Diodes Limit High-Speed Termination Effects LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) 18 17 16 15 14 13 1234 56 7 20 19 VCC 91 0 GND 12 11 SN54/74LS540 SN54/74LS541 18 17 16 15 14 13 1234 56 7 20 19 VCC 91 0 GND 12 11 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 –55 125 IOH Output Current — High 54 –12 –15 mA IOL Output Current — Low 54 mA 74LS540 74LS541 OCTAL BUFFER/LINE DRIVER WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY

ORDERING INFORMATION

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(1) (19) (2) (3) (4) (5) (6) (7) (8) (9) (11) (12) (13) (14) (15) (16) (17) (18) D 1 D 2 D 3 D 4 D 5 D 6 D 7 D 8 Y8 (1) (19) (2) (3) (4) (5) (6) (7) (8) (9) (11) (12) (13) (14) (15) (16) (17) (18) SN54/74LS540 • SN54/74LS541 INPUTS OUTPUTS E1 E2 D LS540 LS541 L L H L H H X X Z Z X H X Z Z L L L H L L = LOW Voltage Level H = HIGH Voltage Level X = Immaterial Z = High Impedance DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Sb l P Limits Ui T C di iSymbol Parameter Min Typ Max Unit Test Conditions VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for All Inputs VIL Input LOW Voltage 54 0.7 V Guaranteed Input LOW Voltage forVIL Input LOW Voltage 74 0.8 V pg All Inputs VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA VOH Output HIGH Voltage 54, 74 2.4 3.4 V VCC = MIN, IOH = –3.0 mA VOH O utput HIGH Voltage 54, 74 2.0 V VCC = MIN, IOH = MAX, VIL = 0.5 V VOL Output LOW Voltage 54, 74 0.25 0.4 V IOL = 12 mA VCC = VCC MIN, VIN =V ILor VIHVOL O utput LOW Voltage 74 0.35 0.5 V IOL = 24 mA VIN = VIL or VIH per Truth Table VT+–VT– Hysteresis 0.2 0.4 V VCC = MIN IOZH Output Off Current HIGH 20 µA VCC = MAX, VOUT = 2.7 V IOZL Output Off Current LOW –20 µA VCC = MAX, VOUT = 0.4 V IIH Input HIGH Current 20 µA VCC = MAX, VIN = 2.7 V IIH Input HIGH C urrent 0.1 mA VCC = MAX, VIN = 7.0 V IIL Input LOW Current –0.2 mA VCC = MAX, VIN = 0.4 V IOS Short Circuit Current (Note 1) –40 –225 mA VCC = MAX I Power Supply Current Total, Output HIGH LS540 25 mA V MAXI LS541 32 mA V MAXICC Total Output LOW LS540 45 mA VCC = MAXCC Total, O utput LOW LS541 52 mA CC Total Output 3-State LS540 52 mA Total O utput 3-State LS541 55 mA Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. www.sycelectronica.com.ar