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74LVCH32245AEC
32-bit bus transceiver with direction pin; 5 V tolerant; 3-state
Philips Semiconductors Product specification
32-bit bus transceiver with direction pin; V tolerant; 3-state
74L VC32245A;
74LVCH32245A
FEATURES5 V tolerant inputs/outputs for interfacing with 5 V logic Wide supply voltage range of 1.2to 3.6V Complies with JEDEC standard no. 8-1A CMOS low power consumption MULTIBYTE flow-trough standard pin-out architecture Low inductance multiple power and ground pins for
minimum noise and ground bounce Direct interface with TTL levels Bus hold on data inputs (74LVCH32245A only) Typical output ground bounce voltage:
VOLP <0.8VatVCC= 3.3 V; Tamb =25°C Typical output VOH undershoot voltage:
VOHV >2VatVCC= 3.3 V; Tamb =25°C Power-off disabled outputs, permitting live insertion Plastic fine-pitch ball grid array package.
DESCRIPTIONThe 74LVC(H)32245Aisa high-performance, low-power,
low-voltage, Si-gate CMOS device, superior to most
advanced CMOS compatible TTL families. Inputs can be
driven from either 3.3or5V devices.In 3-state operation,
outputs can handle 5 V. These features allow the use of
these devices in a mixed 3.3 and5 V environment.
The 74LVC(H)32245A is a 32-bit transceiver featuring
non-inverting 3-state bus compatible outputsin both send
and receive directions. The 74LVC(H)32245A features two
output enable (nOE) inputs for easy cascading and two
send or receive (nDIR) inputs for direction control. nOE
controls the outputs so that the buses are effectively
isolated.
To ensure the high-impedance state during power-up or
power-down, input nOE should be tied to VCC through a
pull-up resistor; the minimum value of the resistor is
determined by the current-sinking capability of the driver.
The 74LVCH32245A bus hold data inputs eliminates the
need for external pull-up resistors to hold unused or
floating data inputs at a valid logic level (see Fig.2).
QUICK REFERENCE DATAGround=0 V; Tamb =25 °C; tr =tf≤ 2.5 ns.
Note CPD is used to determine the dynamic power dissipation (PDin μW). =CPD× VCC2×fi+ Σ(CL× VCC2×fo) where:= input frequency in MHz;= output frequency in MHz;= output load capacitance in pF;
VCC= supply voltage in Volts;
Σ(CL× VCC2×fo)= sum of the outputs.
Philips Semiconductors Product specification
32-bit bus transceiver with direction pin; V tolerant; 3-state
74LVC32245A;
74LVCH32245A
FUNCTION TABLESee note1.
Note H= HIGH voltage level;= LOW voltage level;= don’t care;= high-impedance OFF-state.
ORDERING INFORMATION
PINNING
Philips Semiconductors Product specification
32-bit bus transceiver with direction pin; V tolerant; 3-state
74LVC32245A;
74LVCH32245A
Philips Semiconductors Product specification
32-bit bus transceiver with direction pin; V tolerant; 3-state
74LVC32245A;
74LVCH32245A
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Philips Semiconductors Product specification
32-bit bus transceiver with direction pin; V tolerant; 3-state
74LVC32245A;
74LVCH32245A
RECOMMENDED OPERATING CONDITIONS
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134); voltages are referenced to GND (ground=0V).
Notes The input and output voltage ratings may be exceeded if the input and output current ratings are observed. Above70 °C the value of PD derates linearly with 1.8 mW/K.
Philips Semiconductors Product specification
32-bit bus transceiver with direction pin; V tolerant; 3-state
74LVC32245A;
74LVCH32245A
DC CHARACTERISTICSOver recommended operating conditions; voltage are referenced to GND (ground=0V).
Notes All typical values are at VCC= 3.3 V and Tamb =25 °C. For bus hold parts the bus hold circuit is switched off when VI exceeds VCC allowing 5.5 V on the input terminal. Valid for data inputs of bus hold parts only (LVCH32xxx-A). For data inputs only. Control inputs do not have a bus hold 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 level.
Philips Semiconductors Product specification
32-bit bus transceiver with direction pin; V tolerant; 3-state
74LVC32245A;
74LVCH32245A
AC CHARACTERISTICSGround=0 V; tr =tf≤ 2.5 ns; CL=50 pF; RL= 500Ω.
Note All typical values are measured at VCC= 3.3 V and Tamb =25 °C.
AC WAVEFORMS
