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74LVC245APW
Octal bus transceiver with direction pin with 5-volt tolerant inputs/outputs 3-State
Product specification
Supersedes data of 1997 Dec 19
IC24 Data Handbook
1998 May 20
Philips Semiconductors Product specification
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
FEATURES 5-volt tolerant inputs/outputs, for interfacing with 5-volt logic Supply voltage range of 2.7V to 3.6V Complies with JEDEC standard no. 8-1A CMOS low power consumption Direct interface with TTL levels High impedance when VCC = 0V Bushold on all data inputs (74LVCH245A only)
DESCRIPTIONThe 74LVC245A/74LVCH245A 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 74LVC245A/74LVCH245A is an octal transceiver featuring
non-inverting 3-State bus compatible outputs in both send and
receive directions. The ’245’ features an output enable (OE) input for
easy cascading and a send/receive (DIR) input for direction control.
OE controls the outputs so that the buses are effectively isolated.
The ’245’ is functionally identical to the ’640’, but the ’640’ has true
(non-inverting) outputs.
QUICK REFERENCE DATA
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
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
PIN CONFIGURATION
PIN DESCRIPTION
FUNCTION TABLE = HIGH voltage level = LOW voltage level = Don’t care = High impedance OFF-state
LOGIC SYMBOL
LOGIC SYMBOL (IEEE/IEC)
Philips Semiconductors Product specification
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (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
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (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. Valid for data inputs of bushold parts (LVCH-A) only. For data inputs only, control inputs do not have a bushold circuit. The specified sustaining current at the data input holds the input below the specified VI level. The specified overdrive current at the data input forces the data input to the opposite logic input state. For bushold parts, the bushold circuit is switched off when VI exceeds VCC allowing 5.5V on the input terminal. For I/O ports the parameter IOZ includes the input leakage current.
Philips Semiconductors Product specification
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-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.
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. Input (Dn) to output (Qn) propagation delays.
TEST CIRCUIT
Waveform 3. Load circuitry for switching times.
