SN74AVC2T245RSWR - 2-Bit Dual-Supply Level Shifter | Texas Instruments
料号： SN74AVC2T245RSWR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.56 | $5.60 |
| 100 | $0.42 | $42.00 |
| 500 | $0.35 | $175.00 |
| 1,000 | $0.29 | $290.00 |
SN74AVC2T245RSWR 概述
A dual-supply bus transceiver is a logic device that transfers data bidirectionally between two ICs operating at different logic levels, such as a 1.8 V microcontroller and a 3.3 V peripheral. It belongs to the broader hierarchy of voltage translators within interface logic ICs, and the SN74AVC2T245 is a member of TI's AVC (Advanced Very-low-voltage CMOS) family, optimized for high speed and low static power.
Key features include independent direction control for each channel (DIR1 and DIR2), an output-enable (OE) pin for 3-state bus isolation, and a VCC isolation feature that forces all I/O ports to high impedance when either supply is at GND. The device achieves data rates up to 380 Mbps with a typical propagation delay of 2.4 ns and delivers 12 mA output drive at 3.3 V.
The AVC architecture uses configurable level shifting: output levels are set automatically by VCCA and VCCB with no direction-strapping constraints. Ioff circuitry supports partial power-down operation by blocking backflow current when either rail collapses, and quiescent current is approximately 20 uA for battery-friendly designs.
Typical applications include level shifting for I2C, SPI, UART, and GPIO buses in personal electronics, industrial control, and networking equipment. The 1.8 mm x 1.4 mm UQFN footprint suits space-constrained portable and wearable designs.
Design consideration: keep both supplies within 1.2 V to 3.6 V at all times, and use the OE pin with a pull-down so the bus stays tri-stated during power-up to avoid contention.
直接替换替代料： SN74AVC2T245RSWR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
SN74AXC2T245RSWR
✅ 直接替换📋 参考替代料（不在目录中）
SN74AVCH2T245RSWR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN74AVC2T45RSWR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN74LVC2T45RSWR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
74AVC2T245GU-Q100X
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
SN74AVC2T245RSWR 规格参数
| Logic Function | Dual-bit dual-supply bus transceiver with configurable voltage translation |
| Bits per Element | 2 |
| Supply Voltage Range (VCCA and VCCB) | 1.2 V to 3.6 V |
| 输出类型 | 3-State |
| Direction Control | Independent per channel (DIR1, DIR2) |
| Output Drive | +/-12 mA at 3.3 V |
| Propagation Delay (typ) | 2.4 ns |
| Max Data Rate | 380 Mbps |
| Quiescent Current (typ) | 20 uA |
| Ioff Partial Power-Down | Yes |
| VCC Isolation Feature | Yes (I/O high-Z if either rail at GND) |
| 工作温度 | -40C to +85C |
| 封装 | 10-UQFN (RSW) 1.8 mm x 1.4 mm |
| 安装类型 | Surface Mount |
| Marking Code | TQ7 / VCx family codes |
| RoHS 状态 | Compliant |
SN74AVC2T245RSWR 引脚配置
| 引脚 1 | A1 — Port A data 1 (VCCA domain) |
| 引脚 2 | VCCA — Supply voltage A, 1.2 V to 3.6 V |
| 引脚 3 | DIR1 — Direction control channel 1 |
| 引脚 4 | A2 — Port A data 2 (VCCA domain) |
| 引脚 5 | GND — Ground |
| 引脚 6 | B2 — Port B data 2 (VCCB domain) |
| 引脚 7 | DIR2 — Direction control channel 2 |
| 引脚 8 | VCCB — Supply voltage B, 1.2 V to 3.6 V |
| 引脚 9 | B1 — Port B data 1 (VCCB domain) |
| 引脚 10 | OE — Output enable (active high; 3-state when low) |
典型应用
SN74AVC2T245RSWR 适用于 6 应用s: MCU-to-Peripheral Level Shifting, Portable and Wearable Electronics, Industrial Control and Automation, Networking and Communication Equipment, Automotive Infotainment and Clusters, Test and Measurement Instrumentation.
MCU-to-Peripheral Level Shifting
Bridges a 1.8 V microcontroller (e.g., MSP430) GPIO bank to 3.3 V peripherals or vice versa. The SN74AVC2T245RSWR fits because both rails independently span 1.2 V to 3.6 V and translation direction is configured by DIR1/DIR2 without external pull-ups. With 2.4 ns propagation delay and 380 Mbps capability, timing margins on fast SPI or parallel buses are preserved. The VCC isolation feature keeps I/O high-Z during sequencing, protecting the low-voltage MCU from back-drive.
推荐
Portable and Wearable Electronics
In phones, wearables, and personal electronics, board space and battery life dominate. The 1.8 mm x 1.4 mm 10-UQFN package minimizes footprint, while ~20 uA quiescent current and Ioff partial power-down protection prevent battery drain and bus contention when a subsystem rail collapses. Typical use is translating sensor or display interfaces between 1.8 V application processors and 3.3 V codecs, where 380 Mbps easily exceeds interface requirements and the small package fits dense flexible PCBs.
推荐
Industrial Control and Automation
Industrial controllers mix 3.3 V logic with 2.5 V or 1.8 V FPGAs and DSPs. The SN74AVC2T245RSWR provides robust +/-12 mA drive at 3.3 V, sufficient for noisy backplane runs, and -40C to +85C operation covers cabinet environments. Using the OE pin, a supervisor can isolate buses during brownouts; the VCC isolation feature automatically tri-states all ports if either rail fails, preventing latch-up. SPI and parallel configuration buses between DSPs (e.g., C2000) and translation are common roles.
推荐
Networking and Communication Equipment
Switch, router, and optical module boards translate between 1.8 V ASIC control planes and 3.3 V PHYs or microcontrollers. The 380 Mbps data rate and 2.4 ns delay support management MDIO-style and high-speed parallel status links, while 3-state outputs allow sharing of status buses among multiple line cards. Low dynamic power keeps line-card thermal budgets intact, and tape-and-reel packaging (RSWR, 3000 units) supports automated SMT assembly in volume.
推荐
Automotive Infotainment and Clusters
Although the standard grade is not AEC-Q100 qualified, the AVC2T245 topology is commonly evaluated for non-safety automotive cabin electronics operating -40C to +85C, such as display serial-link GPIO expansion and touch-controller interfaces between 1.8 V SoCs and 3.3 V peripherals. For formally qualified designs, migrate to the pin-compatible AXC2T245 -Q1 variants. The configurable translation removes direction-strapping errors, and OE-based isolation simplifies power sequencing across cluster sleep/wake states.
推荐
Test and Measurement Instrumentation
Bench instruments and logic analyzers frequently interface to DUTs running at 1.2 V, 1.5 V, 1.8 V, or 3.3 V. The AVC2T245's wide 1.2 V to 3.6 V dual-rail range lets one hardware design adapt to multiple logic standards by changing VCCA/VCCB, reducing SKU proliferation. Fast 2.4 ns propagation with low channel-to-channel skew preserves timing measurements, and 3-state outputs let the instrument disconnect from the DUT via OE without mechanical relays.
推荐
推荐产品汇总
工程参考数据： SN74AVC2T245RSWR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SN74AXC2T245RSWR | SN74AVCH2T245RSWR | SN74LVC2T45RSWR |
|---|---|---|---|---|
| Package | 10-UQFN (RSW) 1.8x1.4 mm | 10-UQFN (RSW) - same | 10-UQFN (RSW) - same | 10-UQFN (RSW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Supply Voltage Range | 1.2 V to 3.6 V | 0.65 V to 3.6 V | 1.2 V to 3.6 V | 1.65 V to 3.6 V |
| Bits | 2 | 2 | 2 | 2 |
| Direction Control | Independent DIR1/DIR2 | Independent DIR1/DIR2 | Independent DIR1/DIR2 | Single DIR |
| Max Data Rate | 380 Mbps | 400 Mbps (approx) | 380 Mbps | Lower (approx 100 Mbps class) |
| Output Drive | +/-12 mA at 3.3 V | +/-12 mA at 3.3 V | +/-12 mA at 3.3 V | +/-24 mA |
| Automotive Grade Option | No (standard grade, -40C to +85C) | No (Q1 variants exist separately) | Yes (AEC-Q100, different package) | Yes (AEC-Q100) |
关键差异点
- Independent per-channel direction control （对比 SN74LVC2T45RSWR)
- Lower minimum supply voltage family option （对比 SN74AXC2T245RSWR)
- High speed in tiny footprint （对比 SN74LVC2T45RSWR)
设计说明
Tie the OE pin to GND with a 10 kOhm pull-down so the bus stays 3-stated during power-up; only assert OE after both VCCA and VCCB are stable. Both supplies must stay within 1.2 V to 3.6 V. The VCC isolation feature tri-states all I/O if either rail is at GND, but sequencing glitches above GND are not fully covered, so add RC delay on OE if rails ramp slowly.
Place 0.1 uF ceramic decoupling capacitors within 1 mm of both VCCA and VCCB pins, each with a solid via to the ground plane. The 1.8 mm x 1.4 mm UQFN has a 0.4 mm pitch; use solder-mask-defined pads per TI's QFN layout guideline to prevent bridging. Keep A-side and B-side traces short (< 50 mm) to preserve signal integrity at 380 Mbps.
DIR1/DIR2 must not change state while data is being transmitted on the corresponding channel, or the output can momentarily drive into contention. Change direction only when the bus is idle, per TI AVC-family application guidance. For shared multidrop buses, control OE from a decoded chip-select so only one transceiver drives at any time.
合规信息
RoHS compliance per TI standard AVC family production. REACH and MSL classifications not populated in retrieved data - confirm on TI product page. Standard grade is -40C to +85C; not AEC-Q100 qualified.
