SCES584B JUNE 2005 – November 2014 SN74LVC8T245
The SN74LVC8T245 is an 8-bit, dual supply non-inverting voltage level translation. Pin Ax and direction control pin are support by VCCA and pin Bx is support by VCCB. The A port is able to accept I/O voltages ranging from 1.65 V to 5.5 V, while the B port can accept I/O voltages from 1.65 V to 5.5 V. The high on DIR allows data transmission from A to B and a low on DIR allows data transmission from B to A.
Both VCCA and VCCB can be supplied at any voltage between 1.65 V and 5.5 V making the device suitable for translating between any of the voltage nodes (1.8 V, 2.5 V, 3.3 V and 5 V).
Ioff prevents backflow current by disabling I/O output circuits when device is in partial-power-down mode.
The SN74LVC8T245 is voltage level translator that can operate from 1.65 V to 5.5 V (VCCA) and 1.65 V to 5.5 V (VCCB). The signal translation between 1.65 V and 5.5 V requires direction control and output enable control. When OE is low and DIR is high, data transmission is from A to B. When OE is low and DIR is low, data transmission is from B to A. When OE is high, both output ports will be high-impedance.
|CONTROL INPUTS||OUTPUT CIRCUITS||OPERATION|
|OE||DIR||A PORT||B PORT|
|L||L||Enabled||Hi-Z||B data to A bus|
|L||H||Hi-Z||Enabled||A data to B bus|