Specifications
| Type | Description |
|---|---|
| Part Number | SN74AVC20T245_Bus |
| Manufacturer | Texas Instruments |
| Product Type | I2C Switch |
| Category | Signal Chain |
| Component Type | Other |
| Package / Case | DGG 56-pin TSSOP; DGV 56-pin TVSOP; GQL/ZQL VFBGA |
| Function | 20-bit noninverting bus transceiver with configurable voltage translation and 3-state outputs; general device description |
| Data Direction Control | DIR controls transfer direction; DIR=L: B data to A bus; DIR=H: A data to B bus when OE=L |
| Output Enable Function | OE disables outputs for bus isolation; OE=H, DIR=X: isolation |
| Number of Sections | 2 independent 10-bit sections; function table specified for each 10-bit section |
| A-Port Supply Range | 1.2 to 3.6 V; VCCA recommended operating condition |
| B-Port Supply Range | 1.2 to 3.6 V; VCCB recommended operating condition |
| Optimized Operating Supply Range | 1.4 to 3.6 V; VCCA/VCCB optimized operation |
| Minimum Operational Supply | 1.2 V; VCCA/VCCB operational as low as 1.2 V |
| Control-Input Reference Supply | VCCA; 1DIR, 2DIR, 1OE, and 2OE supplied/referenced by VCCA |
| Power-Off Isolation | Both ports high impedance if either VCC input is at GND; VCC isolation feature |
| Partial-Power-Down Support | Ioff circuitry disables outputs to prevent damaging backflow; powered-down operation |
| I/O Overvoltage Tolerance | 4.6 V tolerant; inputs/outputs and I/Os feature list |
| Maximum Data Rate | 380 Mbps; 1.8-V to 3.3-V translation |
| Maximum Data Rate | 260 Mbps; <1.8-V to 3.3-V translation |
| Maximum Data Rate | 260 Mbps; translation to 2.5 V |
| Maximum Data Rate | 210 Mbps; translation to 1.8 V |
| Maximum Data Rate | 120 Mbps; translation to 1.5 V |
| Maximum Data Rate | 100 Mbps; translation to 1.2 V |
| Supply Voltage Absolute Maximum | -0.5 to 4.6 V; VCCA and VCCB over operating free-air temperature range |
| Input Voltage Absolute Maximum | -0.5 to 4.6 V; A-port I/O, B-port I/O, and control inputs |
| High-Impedance or Power-Off Output Voltage Absolute Maximum | -0.5 to 4.6 V; A port or B port output in high-impedance or power-off state |
| Active A-Port Output Voltage Absolute Maximum | -0.5 to VCCA + 0.5 V; A-port output in high or low state |
| Active B-Port Output Voltage Absolute Maximum | -0.5 to VCCB + 0.5 V; B-port output in high or low state |
| Input Clamp Current | -50 mA; VI < 0 |
| Output Clamp Current | -50 mA; VO < 0 |
| Continuous Output Current | ±50 mA; any output |
| Continuous Supply/Ground Current | ±100 mA; through each VCCA, VCCB, and GND |
| Package Thermal Impedance | 64 °C/W; DGG package, JESD 51-7 |
| Package Thermal Impedance | 48 °C/W; DGV package, JESD 51-7 |
| Package Thermal Impedance | 42 °C/W; GQL/ZQL package, JESD 51-7 |
| Storage Temperature Range | -65 to 150 °C; absolute maximum rating |
| High-Level Input Voltage | 0.65 × VCCI min; data inputs, VCCI=1.2 to 1.95 V |
| High-Level Input Voltage | 1.6 V min; data inputs, VCCI=1.95 to 2.7 V |
| High-Level Input Voltage | 2.0 V min; data inputs, VCCI=2.7 to 3.6 V |
| Low-Level Input Voltage | 0.35 × VCCI max; data inputs, VCCI=1.2 to 1.95 V |
| Low-Level Input Voltage | 0.7 V max; data inputs, VCCI=1.95 to 2.7 V |
| Low-Level Input Voltage | 0.8 V max; data inputs, VCCI=2.7 to 3.6 V |
| High-Level DIR Input Voltage | 0.65 × VCCA min; DIR referenced to VCCA, VCCA=1.2 to 1.95 V |
| High-Level DIR Input Voltage | 1.6 V min; DIR referenced to VCCA, VCCA=1.95 to 2.7 V |
| High-Level DIR Input Voltage | 2.0 V min; DIR referenced to VCCA, VCCA=2.7 to 3.6 V |
| Low-Level DIR Input Voltage | 0.35 × VCCA max; DIR referenced to VCCA, VCCA=1.2 to 1.95 V |
| Low-Level DIR Input Voltage | 0.7 V max; DIR referenced to VCCA, VCCA=1.95 to 2.7 V |
| Low-Level DIR Input Voltage | 0.8 V max; DIR referenced to VCCA, VCCA=2.7 to 3.6 V |
| Input Voltage Recommended Range | 0 to 3.6 V; VI recommended operating condition |
| Output Voltage Recommended Range | 0 to VCCO; active state |
| Output Voltage Recommended Range | 0 to 3.6 V; 3-state condition |
| High-Level Output Current | -3 mA; VCCO=1.2 V |
| High-Level Output Current | -6 mA; VCCO=1.4 to 1.6 V |
| High-Level Output Current | -8 mA; VCCO=1.65 to 1.95 V |
| High-Level Output Current | -9 mA; VCCO=2.3 to 2.7 V |
| High-Level Output Current | -12 mA; VCCO=3.0 to 3.6 V |
| Low-Level Output Current | 3 mA; VCCO=1.2 V |
| Low-Level Output Current | 6 mA; VCCO=1.4 to 1.6 V |
| Low-Level Output Current | 8 mA; VCCO=1.65 to 1.95 V |
| Low-Level Output Current | 9 mA; VCCO=2.3 to 2.7 V |
| Low-Level Output Current | 12 mA; VCCO=3.0 to 3.6 V |
| Input Transition Rise/Fall Rate | 5 ns/V max; recommended operating condition |
| Operating Free-Air Temperature | -40 to 85 °C; recommended operating condition |
| High-Level Output Voltage | VCCO - 0.2 V min; IOH=-100 µA, VCCA=1.2 to 3.6 V, VCCB=1.2 to 3.6 V |
| High-Level Output Voltage | 0.95 V min; IOH=-3 mA, VCCA=1.2 V, VCCB=1.2 V |
| High-Level Output Voltage | 1.05 V min; IOH=-6 mA, VCCA=1.4 V, VCCB=1.4 V |
| High-Level Output Voltage | 1.2 V min; IOH=-8 mA, VCCA=1.65 V, VCCB=1.65 V |
| High-Level Output Voltage | 1.75 V min; IOH=-9 mA, VCCA=2.3 V, VCCB=2.3 V |
| High-Level Output Voltage | 2.3 V min; IOH=-12 mA, VCCA=3 V, VCCB=3 V |
| Low-Level Output Voltage | 0.2 V max; IOL=100 µA, VCCA=1.2 to 3.6 V, VCCB=1.2 to 3.6 V |
| Low-Level Output Voltage | 0.15 V max; IOL=3 mA, VCCA=1.2 V, VCCB=1.2 V |
| Low-Level Output Voltage | 0.35 V max; IOL=6 mA, VCCA=1.4 V, VCCB=1.4 V |
| Low-Level Output Voltage | 0.45 V max; IOL=8 mA, VCCA=1.65 V, VCCB=1.65 V |
| Low-Level Output Voltage | 0.55 V max; IOL=9 mA, VCCA=2.3 V, VCCB=2.3 V |
| Low-Level Output Voltage | 0.7 V max; IOL=12 mA, VCCA=3 V, VCCB=3 V |
| Control Input Leakage Current | ±0.025 µA typ, ±0.25 µA max at 25°C, ±1 µA max over -40 to 85°C; VI=VCCA or GND, VCCA=1.2 to 3.6 V, VCCB=1.2 to 3.6 V |
| Power-Off Leakage Current | ±0.1 µA typ, ±1 µA max at 25°C, ±5 µA max over -40 to 85°C; A or B port, VI or VO=0 to 3.6 V, VCCA=0 V, VCCB=0 to 3.6 V |
| Power-Off Leakage Current | ±0.1 µA typ, ±1 µA max at 25°C, ±5 µA max over -40 to 85°C; A or B port, VI or VO=0 to 3.6 V, VCCA=0 to 3.6 V, VCCB=0 V |
| Latch-Up Performance | >100 mA; per JESD 78, Class II |
| ESD Human-Body Model | 8000 V; JESD 22 A114-A |
| ESD Machine Model | 200 V; JESD 22 A115-A |
| ESD Charged-Device Model | 1000 V; JESD 22 C101 |
| Datasheet Status | request_only |
Product Overview
The SN74AVC20T245_Bus is a Texas Instruments 20-bit dual-supply bus transceiver for Interface designs requiring noninverting bidirectional transfer, voltage translation, and 3-state output control. It is divided into two independent 10-bit sections, each controlled by DIR and OE logic. When OE is low, DIR selects B-to-A transfer with DIR low or A-to-B transfer with DIR high; when OE is high, outputs are disabled for bus isolation.
Both A-port and B-port supplies support recommended operation from 1.2 to 3.6 V, with optimized operation from 1.4 to 3.6 V. Control inputs 1DIR, 2DIR, 1OE, and 2OE are supplied and referenced by VCCA. The device includes high-impedance behavior when either VCC input is at GND, plus Ioff circuitry for partial-power-down conditions.
Package options include DGG 56-pin TSSOP, DGV 56-pin TVSOP, and GQL/ZQL VFBGA. Documented use cases include voltage-translated parallel bus connections, isolated bidirectional bus interfaces, and mixed-voltage systems operating across 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V domains.
Key Features
- 20-bit noninverting bus transceiver with 3-state outputs
- Two independent 10-bit sections for bus control
- DIR selects B-to-A or A-to-B transfer direction
- OE disables outputs for bus isolation
- A and B ports operate from 1.2 to 3.6 V
- Optimized operation specified from 1.4 to 3.6 V
- Control inputs are supplied and referenced by VCCA
- Ports remain high impedance if either VCC is grounded
- Ioff circuitry supports partial-power-down operation
- I/O pins are 4.6 V tolerant
- Maximum 380 Mbps for 1.8 V to 3.3 V translation
- -40 to 85 °C recommended free-air operating range
Typical Applications
- Mixed-voltage parallel bus interfaces
- Bidirectional voltage translation buses
- 1.2 V to 3.3 V logic translation
- Bus isolation with 3-state outputs
- Two-section 10-bit data path designs
- Partial-power-down interface connections
- High-density VFBGA interface assemblies
Procurement Notes
When requesting a quote for SN74AVC20T245_Bus, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What function does SN74AVC20T245_Bus provide?
SN74AVC20T245_Bus is a 20-bit noninverting bus transceiver with configurable voltage translation and 3-state outputs. It uses two independent 10-bit sections and supports bidirectional transfer controlled by DIR and OE inputs.
What supply ranges are supported on the A and B ports?
The recommended operating range for both VCCA and VCCB is 1.2 to 3.6 V. The datasheet specifies optimized operation from 1.4 to 3.6 V and operation as low as 1.2 V.
How is bus isolation controlled on this device?
OE disables the outputs for bus isolation. The function table specifies isolation when OE is high, regardless of DIR. When OE is low, DIR selects either B-to-A or A-to-B data transfer.
What happens if either supply is at ground?
The VCC isolation feature places both ports in a high-impedance state if either VCC input is at GND. Ioff circuitry also disables outputs during powered-down operation to help prevent damaging backflow.
What package options are listed for SN74AVC20T245_Bus?
The listed package options are DGG 56-pin TSSOP, DGV 56-pin TVSOP, and GQL/ZQL VFBGA. Package thermal impedance values are 64 °C/W for DGG, 48 °C/W for DGV, and 42 °C/W for GQL/ZQL.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.