TXS0108EPWR - 8-Bit Bidirectional Level Shifter 60Mbps | TI
MPN: TXS0108EPWR ✓ Hoạt độngTXS0108EPWR Tóm tắt
A voltage-level translator, also called a level shifter, is an integrated circuit that enables digital communication between systems operating at different voltage domains. Within the logic-translation hierarchy, bidirectional auto-direction translators such as the TXS0108E sit alongside direction-controlled families like the SN74LVC8T245 and TXB0108, providing mixed-voltage interfacing for microcontrollers, peripherals, and buses.
Key features include automatic direction sensing, which eliminates a direction-control pin, and a VCC isolation feature: if either supply rail is at GND, all I/Os enter high impedance, preventing back-powering during partial power-down. Quiescent current is low at 620 uA, and the one-shot accelerator architecture speeds low-to-high transitions for high-speed push-pull operation. The device is specified from -40C to +85C, is RoHS compliant, and carries MSL 1 (260C unlimited floor life).
Architecturally, the TXS0108E combines a pull-up based open-drain translation path with edge-accelerating one-shots, making it equally suitable for I2C-style open-drain buses and push-pull SPI/UART links. This auto-direction design trades output drive strength for bidirectionality, so it excels on lightly loaded point-to-point links rather than heavily bused systems.
Typical applications include interfacing 1.8V or 3.3V microcontrollers with 5V sensors, SD/MMC memory-card interfaces, UART/SPI/I2C bus translation, and mixed-voltage communication in consumer, industrial, and IoT systems.
Design tip: for open-drain use, external pull-up resistors are required on both sides; keep them sized per datasheet recommendations to avoid rise-time degradation at target data rates. Pricing as of 2026-08-29.
Bộ thay thế dễ dàng lắp đặt cho TXS0108EPWR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với TXS0108EPWR (cùng hình factor và footprint) — khác nhau ở Direction Control, Output Type, Translator Type, Operating Temperature, Package.
TXS0108EQPWRQ1
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TXB0108PWR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →TXB0108QPWRQ1
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →NXB0108PW
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TXS0108EPWR Tỷ lệ tối đa & tính chất điện
| Chức năng | 8-bit bidirectional voltage-level translator |
| Translator Type | Voltage Level Translator, Bidirectional, 1 Circuit, 8 Channel |
| Signal Type | Open-drain and push-pull |
| VCCA Supply Range (A Port) | 1.2 V to 3.6 V |
| VCCB Supply Range (B Port) | 1.65 V to 5.5 V |
| Max Data Rate (Push-Pull) | 60 Mbps |
| Max Data Rate (Open-Drain) | 2 Mbps |
| Propagation Delay | 4.8 ns |
| Điện áp yên tĩnh | 620 uA |
| Direction Control | Automatic direction sensing |
| VCC Isolation | Yes - outputs high impedance if either VCC at GND |
| Nhiệt độ hoạt động | -40C to +85C |
| Hộp | TSSOP (PW), 20 pins |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (260C unlimited floor life) |
| Trạng thái RoHS | Compliant |
| OE Pin | Yes - output enable, three-state outputs |
Cấu hình chân TXS0108EPWR
| Chân 1 | A1 — A-port data I/O 1 |
| Chân 2 | VCCA — A-port supply, 1.2V to 3.6V |
| Chân 3 | A2 — A-port data I/O 2 |
| Chân 4 | A3 — A-port data I/O 3 |
| Chân 5 | A4 — A-port data I/O 4 |
| Chân 6 | GND — Ground |
| Chân 7 | A5 — A-port data I/O 5 |
| Chân 8 | A6 — A-port data I/O 6 |
| Chân 9 | A7 — A-port data I/O 7 |
| Chân 10 | A8 — A-port data I/O 8 |
| Chân 11 | B8 — B-port data I/O 8 |
| Chân 12 | B7 — B-port data I/O 7 |
| Chân 13 | B6 — B-port data I/O 6 |
| Chân 14 | B5 — B-port data I/O 5 |
| Chân 15 | B4 — B-port data I/O 4 |
| Chân 16 | B3 — B-port data I/O 3 |
| Chân 17 | B2 — B-port data I/O 2 |
| Chân 18 | VCCB — B-port supply, 1.65V to 5.5V |
| Chân 19 | B1 — B-port data I/O 1 |
| Chân 20 | OE — Output enable; low = three-state outputs |
Ứng dụng tiêu biểu
TXS0108EPWR phù hợp cho 6 Áp dụngs: Mixed-Voltage MCU-to-Peripheral Interface, SD/MMC Memory Card Interface, I2C Bus Level Translation, UART and SPI Serial Link Translation, Industrial Control and PLC I/O, IoT and Consumer Mixed-Voltage Systems.
Mixed-Voltage MCU-to-Peripheral Interface
The TXS0108EPWR interfaces 1.8V or 3.3V microcontroller GPIO ports with 5V sensors and peripherals. Its auto-direction sensing eliminates direction pins, and the 1.2V-3.6V VCCA / 1.65V-5.5V VCCB ranges cover the most common mixed-domain combinations. Placed directly on the 8-bit parallel or serial bus between MCU and peripheral, the 4.8 ns propagation delay is negligible at typical GPIO speeds, while VCC isolation prevents back-powering the 5V peripheral during MCU partial power-down sequences.
Được đề xuất
SD/MMC Memory Card Interface
SD/MMC card interfaces require translation between a 1.8V or 3.3V host controller and card I/O. The TXS0108EPWR's 60 Mbps push-pull data rate supports high-speed SD modes, and its open-drain capability handles the card's open-drain initialization phase without a separate translator. Internal 10 kOhm pull-ups aid the CMD/DATA lines, though external pull-ups may be added for heavy bus capacitance. VCC isolation keeps card rails high-impedance when the host controller powers down the slot.
Được đề xuất
I2C Bus Level Translation
For I2C buses spanning 1.8V and 3.3V or 5V domains, the TXS0108EPWR supports open-drain signaling at up to 2 Mbps, exceeding Fast-mode Plus (1 Mbps). Its internal 10 kOhm pull-ups form part of the pull-up network on SDA/SCL channels, and external resistors are sized per datasheet recommendations to meet rise times at the bus capacitance. Two channels of the 8-bit device can serve SDA/SCL while remaining channels translate other mixed-voltage control lines on the same footprint.
Được đề xuất
UART and SPI Serial Link Translation
UART and SPI links between a 1.8V microcontroller and 3.3V or 5V peripherals use the TXS0108EPWR's push-pull mode at 60 Mbps, far above typical UART and SPI clock rates. The one-shot accelerator sharpens slow rising edges from the internal pull-up path, maintaining signal integrity across the 8 channels. Dedicated TX (A-to-B) and RX (B-to-A) channels coexist on the same device because auto-direction sensing resolves traffic direction per channel without a DIR pin.
Được đề xuất
Industrial Control and PLC I/O
Industrial controllers mix legacy 5V logic with modern 3.3V or 1.8V processors. The TXS0108EPWR bridges these domains on 8 parallel lines simultaneously, and its -40C to +85C operating range suits factory-floor temperature extremes. VCC isolation ensures that when either rail collapses, all outputs go high-impedance, protecting both sides during power sequencing faults. The TSSOP-20 package supports standard industrial PCB assembly with MSL 1 handling.
Được đề xuất
IoT and Consumer Mixed-Voltage Systems
Battery-powered IoT nodes frequently pair 1.8V low-power MCUs with 3.3V radios or sensors. The TXS0108EPWR's 620 uA quiescent current and low standby behavior fit power-constrained designs, while the 60 Mbps capability covers high-throughput sensor and display buses. The auto-direction architecture simplifies firmware since no GPIO direction control is needed, and the OE pin allows complete three-stating of the bus during deep-sleep modes to eliminate translation-path leakage.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TXS0108EPWR — 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 | TXS0108EQPWRQ1 | TXB0108PWR | NXB0108PW |
|---|---|---|---|---|
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors |
| VCCA Range | 1.2V to 3.6V | 1.2V to 3.6V | 1.2V to 3.6V | 1.2V to 3.6V |
| VCCB Range | 1.65V to 5.5V | 1.65V to 5.5V | 1.65V to 5.5V | 1.65V to 5.5V |
| Max Data Rate (Push-Pull) | 60 Mbps | 60 Mbps | 100 Mbps | 100 Mbps |
| Open-Drain Support | Yes (2 Mbps) | Yes (2 Mbps) | No | Limited |
| Automotive Grade | No | Yes (AEC-Q100) | No | No |
| Quiescent Current | 620 uA | 620 uA | 4 uA | 6 uA |
| Internal Pull-Ups | 10 kOhm on all I/O | 10 kOhm | Weak (one-shot only) | Weak |
Bảo phân biệt quan trọng
- Open-drain and push-pull capability in one device (vsTXB0108PWR)
- Automotive drop-in upgrade available (vsTXS0108EQPWRQ1)
- One-shot edge acceleration (vsNXB0108PW)
Ghi chú thiết kế
The TXS0108E's internal 10 kOhm pull-ups combine with external pull-up resistors on open-drain buses; the effective resistance is the parallel combination, which increases static current on I2C lines pulled low. Do not use the TXS0108E in heavily loaded or multi-drop buses where bus contention can exceed its weak output drive - use a direction-controlled translator such as SN74LVC8T245 for those topologies.
Tie OE through a pull-down resistor (about 10 kOhm) to GND so outputs remain three-stated during power-up until both VCCA and VCCB are stable. The VCC isolation feature protects against back-powering when one rail is at GND, but sequencing OE after both rails prevents transient glitches on the bus during startup.
Place 0.1 uF ceramic decoupling capacitors within 2 mm of both VCCA and VCCB pins to ground. Because the one-shot accelerator drives fast edges, keep series traces short (<50 mm) and maintain a solid ground plane to control ringing on 60 Mbps push-pull channels. For open-drain channels, compute external pull-up values from total bus capacitance to meet rise-time targets at 2 Mbps.
Thông tin tuân thủ
RoHS compliant per PartGenie compliance data (RoHS Yes, MSL 1-260C-UNLIM). Not AEC-Q100 qualified; use TXS0108EQPWRQ1 for automotive.
