HD74LVCR2245A

HD74LVCR2245A Octal Bidirectional Transceivers with 3–state Outputs ADE-205-235A (Z) Preliminary 2nd. Edition January 1999 Description The HD74LVCR2245A has eight buffers with three state outputs in a 20 pin package. When (T / R ) is high, data flows from the A inputs to the B outputs, and when (T / R ) is low, data flows from the B inputs to the A outputs. A and B bus are separated by making enable input (OE) high level. All outputs, which are designed to sink up to 12 mA, include equivalent 26 Ω resistors to reduce overshoot and undreshoot. When VCC is between 0 and 1.5 V, the device is in the high impedance state during power up or power down. Low voltage and high speed operation is suitable at battery drive product (note type personal computer) and low power consumption extends the life of a battery for long time operation. Features VCC = 1.65 to 5.5 V All inputs VIH (Max) = 5.5 V (@VCC = 0 to 5.5 V) All inputs / outputs V I / O (Max) = 5.5 V (@V CC = 0 V or output off state) Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C) Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C) High output current ±12 mA (@V CC = 3.0 to 5.5 V) All outputs have equivalent 26 Ω series resistors, so no external resistors are required HD74LVCR2245A Function Table Inputs OE L L H H : High level L : Low level X : Immaterial Z : High impedance T/R L H X B data to A bus A data to B bus Z Operation Pin Arrangement T/R A0 A1 1 2 3 20 VCC 19 OE 18 B0 17 B1 16 B2 15 ...