SN74AVC2T245RSWR - 2-Bit Dual-Supply Level Shifter | Texas Instruments
MPN: SN74AVC2T245RSWR ✓ Hoạt độngSN74AVC2T245RSWR Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho SN74AVC2T245RSWR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
SN74AXC2T245RSWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN74AVCH2T245RSWR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
SN74AVC2T45RSWR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
SN74LVC2T45RSWR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
74AVC2T245GU-Q100X
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
SN74AVC2T245RSWR Thông số kỹ thuật
| 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 |
| Kiểu đầu ra | 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) |
| Nhiệt độ hoạt động | -40C to +85C |
| Hộp | 10-UQFN (RSW) 1.8 mm x 1.4 mm |
| Kiểu lắp đặt | Surface Mount |
| Marking Code | TQ7 / VCx family codes |
| Trạng thái RoHS | Compliant |
Cấu hình chân SN74AVC2T245RSWR
| Chân 1 | A1 — Port A data 1 (VCCA domain) |
| Chân 2 | VCCA — Supply voltage A, 1.2 V to 3.6 V |
| Chân 3 | DIR1 — Direction control channel 1 |
| Chân 4 | A2 — Port A data 2 (VCCA domain) |
| Chân 5 | GND — Ground |
| Chân 6 | B2 — Port B data 2 (VCCB domain) |
| Chân 7 | DIR2 — Direction control channel 2 |
| Chân 8 | VCCB — Supply voltage B, 1.2 V to 3.6 V |
| Chân 9 | B1 — Port B data 1 (VCCB domain) |
| Chân 10 | OE — Output enable (active high; 3-state when low) |
Ứng dụng tiêu biểu
SN74AVC2T245RSWR phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SN74AVC2T245RSWR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Independent per-channel direction control (vsSN74LVC2T45RSWR)
- Lower minimum supply voltage family option (vsSN74AXC2T245RSWR)
- High speed in tiny footprint (vsSN74LVC2T45RSWR)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
