Features: ` Control Inputs VIH/VIL Levels Are Referenced to VCCA Voltage Operation
` Ioff Supports Partial-Power-Down Mode
` VCC Isolation Feature If Either VCC Input Is at GND, All Outputs Are in the High-Impedance State
` Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
` I/Os Are 4.6-V Tolerant
` Overvoltage-Tolerant Inputs/Outputs Allow Mixed-Voltage-Mode Data Communications
` ESD Protection Exceeds JESD 22
8000-V Human-Body Model (A114-A)
200-V Machine Model (A115-A)
1000-V Charged-Device Model (C101)
` Fully Configurable Dual-Rail Design Allows Each Port to Operate Over Full 1.2-V to 3.6-V Power-Supply Range
Specifications
|
|
|
MIN |
MAX |
UNIT |
VCCA
V
|
Supply voltage range |
0.5 |
4.6 |
V |
| VI |
Input voltge range(2) |
I/O ports (A port) |
0.5 |
4.6 |
V |
| I/O ports (B port) |
0.5 |
4.6 |
| Control inputs |
0.5 |
4.6 |
| VO |
Voltage range applied to any output A port 0.5 4.6 VO in the high-impedance or power-off state(2) |
A port |
0.5 |
4.6 |
V |
| B port |
0.5 |
4.6 |
| VO |
Voltage range applied to any output in the high or low state(2) (3) |
A port |
0.5 |
VCCA + 0.5 |
V |
| B port |
0.5 |
VCCB + 0.5 |
| IIK |
Input clamp current |
VI < 0 |
|
50 |
mA |
| IOK |
Output clamp current |
VO < 0 |
|
50 |
mA |
| IO |
Continuous output current |
|
±50 |
mA |
|
Continuous current through each VCCA, VCCB, and GND |
|
±100 |
mA |
| JA |
Package thermal impedance(4) |
GRG/ZRG package |
|
50 |
°C/W |
| Tstg |
Storage temperature range |
|
65 |
150 |
°C |
(1) Stresses beyond those listed under "absolute maximum ratings" 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.
(2) The input voltage and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
(3) The output positive-voltage rating may be exceeded up to 4.6 V maximum if the output current rating is observed.
(4) The package thermal impedance is calculated in accordance with JESD 51-7.
DescriptionThis SN74AVC24T245 24-bit noninverting bus transceiver uses two separate configurable power-supply rails. The SN74AVC24T245 is optimized to operate with VCCA/VCCB set at 1.4 V to 3.6 V. It is operational with VCCA/VCCB as low as 1.2 V. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.2 V to 3.6 V. This allows for universal low-voltage bidirectional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.
The SN74AVC24T245 is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the outputs so the buses are effectively isolated.
The SN74AVC24T245 is designed so that the control pins (1DIR, 2DIR, 3DIR, 4DIR, 5DIR, 6DIR, 1OE, 2OE,3OE, 4OE, 5OE, and 6OE) are supplied by VCCA.
This SN74AVC24T245 device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,preventing damaging current backflow through the device when it is powered down.The VCC isolation feature ensures that if either VCC input is at GND, then both ports are in the high-impedance state.
To ensure the SN74AVC24T245 high-impedance state during power up or power down, OE should be tied to VCCA through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
SN74AVC24T245 Data Sheet
