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74LVC240-74LVC240AD-74LVC240ADB-74LVC240APW
Octal buffer/line driver with 5-volt tolerant inputs/outputs; inverting 3-State
Product specification
IC24 Data Handbook
1998 May 20
Philips Semiconductors Product specification
74LVC240AOctal buffer/line driver with 5-volt
tolerant inputs/outputs; inverting (3-State)
FEATURES 5-volt tolerant inputs/outputs, for interfacing with 5-volt logic Supply voltage range of 1.2V to 3.6V Complies with JEDEC standard no. 8-1A CMOS low power consumption Direct interface with TTL levels High impedance when VCC = 0V
DESCRIPTIONThe 74LVC240A is a high-performance, low-power, low-voltage,
Si-gate CMOS device, superior to most advanced CMOS
compatible TTL families.
Inputs can be driven from either 3.3V or 5V devices. In 3-State
operation, outputs can handle 5V. These features allow the use of
these devices as translators in a mixed 3.3V/5V environment.
The ‘240A is an octal non-inverting buffer/line driver with 3-State
outputs. The 3-State outputs are controlled by the output enable
inputs 1OE and 2OE. A HIGH on nOE causes the outputs to
assume a high impedance OFF-state. Schmitt-trigger action at all
inputs makes the circuit highly tolerant for slower input rise and fall
times.
The ’240’ is functionally identical to the ’244’, but the ’244’ has
inverting outputs.
QUICK REFERENCE DATAGND = 0 V; Tamb = 25°C; tr = tf 2.5 ns
NOTE: CPD is used to determine the dynamic power dissipation (PD in W):
PD = CPD x VCC2 x fi + (CL x VCC2 x fo) where:
fi = input frequency in MHz; CL = output load capacity in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
(CL x VCC2 x fo) = sum of outputs. The condition is VI = GND to VCC
ORDERING INFORMATION
Philips Semiconductors Product specification
74LVC240AOctal buffer/line driver with 5-volt
tolerant inputs/outputs; inverting (3-State)
PIN DESCRIPTION
PIN CONFIGURATION
LOGIC SYMBOL (IEEE/IEC)
FUNCTION TABLE = HIGH voltage level = LOW voltage level = Don’t care = High impedance OFF-state
LOGIC SYMBOL
FUNCTIONAL DIAGRAM
Philips Semiconductors Product specification
74LVC240AOctal buffer/line driver with 5-volt
tolerant inputs/outputs; inverting (3-State)
RECOMMENDED OPERATING CONDITIONS
ABSOLUTE MAXIMUM RATINGS1In accordance with the Absolute Maximum Rating System (IEC 134)
Voltages are referenced to GND (ground = 0V)
NOTES: Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
Philips Semiconductors Product specification
74LVC240AOctal buffer/line driver with 5-volt
tolerant inputs/outputs; inverting (3-State)
DC ELECTRICAL CHARACTERISTICSOver recommended operating conditions voltages are referenced to GND (ground = 0V)
NOTES: All typical values are at VCC = 3.3V and Tamb = 25°C. The specified overdrive current at the data input forces the data input to the opposite logic input state.
AC CHARACTERISTICSGND = 0V; tr = tf � 2.5ns; CL = 50pF; RL = 500Ω; Tamb = –40°C to +85°C.
NOTE: Unless otherwise stated, all typical values are at VCC = 3.3V and Tamb = 25°C.
Philips Semiconductors Product specification
74LVC240AOctal buffer/line driver with 5-volt
tolerant inputs/outputs; inverting (3-State)
AC WAVEFORMSVM = 1.5V at VCC � 2.7V; VM = 0.5 VCC at VCC � 2.7V.
VOL and VOH are the typical output voltage drop that occur with the
output load.
VX = VOL + 0.3V at VCC � 2.7V; VX = VOL + 0.1 VCC at VCC �2.7V
VY = VOH –0.3V at VCC �2.7V; VY = VOH – 0.1 VCC at VCC �2.7V
Waveform 1. Inputs (1An, 2An) to outputs (1Yn, 2Yn)
propagation delays.
Waveform 2. 3-State enable and disable times.
TEST CIRCUIT
Waveform 3. Load circuitry for switching times.
