SN74LVC244QAPWRQ1 - Auto 8-Bit 3-State Buffer | TI
MPN: SN74LVC244QAPWRQ1 ✓ Hoạt độngSN74LVC244QAPWRQ1 Tóm tắt
An octal buffer is a digital logic device that strengthens (buffers) eight signal lines at once, providing higher output drive and isolation between a controller and a load. Within the logic hierarchy, it belongs to the buffer/driver family of CMOS logic ICs, positioned above single-gate buffers and below bus transceivers, which add bidirectional capability.
Key features include fully 3-state outputs for shared-bus connections, individual OE control for each 4-bit half, LVC-family CMOS technology supporting partial-power-down operation with Ioff protection, and an operating temperature range of -40C to +125C suitable for automotive and industrial environments. According to the TI SN74LVC244A-Q1 datasheet (Rev. D), the device performs the non-inverting buffer function Y = A for each channel.
The LVC process provides low quiescent current, TTL-compatible input thresholds at 3.3 V operation, and balanced output drive for typical 24 mA-class loads at 3.3 V, making it suitable for address/data bus driving, clock distribution, and level-stable signal buffering between a microcontroller and peripherals.
Typical applications include automotive body control modules, gateways and infotainment buses, industrial PLC I/O isolation, and memory or peripheral chip-select driving in embedded systems.
Design tip: tie unused OE inputs to VCC through a pull-up resistor so outputs stay in the high-impedance state during power-up, and decouple the VCC pin with a 0.1 uF ceramic capacitor placed within 2 mm of the pin to suppress transient currents during simultaneous switching.
Bộ thay thế dễ dàng lắp đặt cho SN74LVC244QAPWRQ1 — 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 SN74LVC244QAPWRQ1 (cùng hình factor và footprint) — khác nhau ở Output Enable, Output Type, Package, Bits per Element, Function.
SN74LVC244AQPWRQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN74LVC244APWR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SN74LVC244APWLE
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
CLVC244AQPWRG4Q1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
74LVC244APW,118
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
74ALVC244PW,118
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN74LVC244QAPWRQ1 Tỷ lệ tối đa & tính chất điện
| Logic Function | Octal buffer/driver, non-inverting, 3-state |
| Bits per Element | 2 elements x 4 bit (8 total) |
| Supply Voltage Range | 1.65 V to 3.6 V |
| Kiểu đầu ra | 3-State, non-inverting |
| Output Enable | 2 independent OE inputs (one per 4-bit section) |
| Nhiệt độ hoạt động | -40C to +125C |
| Qualification | AEC-Q100 automotive grade |
| Technology | LVC CMOS |
| Input Type | CMOS/TTL-compatible |
| Kiểu lắp đặt | Surface Mount |
| Hộp | 20-TSSOP (PW) |
| Packing | Tape & Reel |
| Trạng thái RoHS | Compliant |
| Series | 74LVC (LVC-Q1) |
Cấu hình chân SN74LVC244QAPWRQ1
| Chân 1 | OE1 — Output enable 1 (low = outputs active) |
| Chân 2 | 1A1 — Data input A1 |
| Chân 3 | 2Y4 — 3-state output Y4 of section 2 |
| Chân 4 | 1A2 — Data input A2 |
| Chân 5 | 2Y3 — 3-state output Y3 of section 2 |
| Chân 6 | 1A3 — Data input A3 |
| Chân 7 | 2Y2 — 3-state output Y2 of section 2 |
| Chân 8 | 1A4 — Data input A4 |
| Chân 9 | 2Y1 — 3-state output Y1 of section 2 |
| Chân 10 | GND — Ground |
| Chân 11 | 2A1 — Data input A1 of section 2 |
| Chân 12 | 1Y4 — 3-state output Y4 of section 1 |
| Chân 13 | 2A2 — Data input A2 of section 2 |
| Chân 14 | 1Y3 — 3-state output Y3 of section 1 |
| Chân 15 | 2A3 — Data input A3 of section 2 |
| Chân 16 | 1Y2 — 3-state output Y2 of section 1 |
| Chân 17 | 2A4 — Data input A4 of section 2 |
| Chân 18 | 1Y1 — 3-state output Y1 of section 1 |
| Chân 19 | OE2 — Output enable 2 (low = outputs active) |
| Chân 20 | VCC — Power supply, 1.65 V to 3.6 V |
Ứng dụng tiêu biểu
SN74LVC244QAPWRQ1 phù hợp cho 6 Áp dụngs: Automotive Body Control Module, Industrial PLC I/O Buffering, Automotive Gateway Module, Infotainment Display Control, Battery Management System, Test and Measurement Instrumentation.
Automotive Body Control Module
In automotive body control modules, the SN74LVC244QAPWRQ1 buffers GPIO outputs from the microcontroller driving relays, lamps, and door actuators. Its AEC-Q100 qualification and -40C to +125C range guarantee reliability across harsh under-hood and cabin environments. The 3-state outputs let multiple modules share diagnostic bus lines, while Ioff partial-power-down protection prevents back-powering the MCU rail during sleep modes, preserving quiescent-current budgets critical for battery drain compliance.
Được đề xuất
Industrial PLC I/O Buffering
In programmable logic controllers, the SN74LVC244QAPWRQ1 strengthens 3.3 V MCU signals before they drive opto-isolators or line receivers on the I/O backplane. The wide -40C to +125C rating suits unconditioned industrial cabinets, and the two independent OE pins allow one half of the buffer to be tri-stated during configuration while the other remains active. At 3.3 V the LVC CMOS technology delivers low quiescent current, reducing heat inside sealed enclosures with passive cooling.
Được đề xuất
Automotive Gateway Module
Gateway modules that bridge CAN, LIN, and Ethernet domains use the SN74LVC244QAPWRQ1 to buffer chip-select, interrupt, and reset lines between host processors and network transceivers. The octal organization covers a full byte-width control bus in one TSSOP-20 footprint, and 3-state outputs permit sharing boot-configuration straps between the MCU and JTAG/debug connectors. According to TI datasheet Rev. D, the device maintains 3-state outputs across the full 1.65 V to 3.6 V VCC range, simplifying multi-rail designs.
Được đề xuất
Infotainment Display Control
Head-unit and cluster display boards use the SN74LVC244QAPWRQ1 to buffer backlight enable, panel reset, and fan-control signals from the graphics SoC. Because display boards mix 1.8 V, 3.3 V, and 5 V domains, the 3-state outputs allow shared control lines to be released during boot until the SoC firmware claims them. The AEC-Q100 rating covers the elevated ambient temperatures inside sealed dashboards, where 85C-rated commercial parts would lose margin.
Được đề xuất
Battery Management System
In BMS slave boards, the SN74LVC244QAPWRQ1 buffers cell-monitor chip-select and balance-control signals from the pack controller. Its Ioff circuitry ensures the buffer does not leak current into the MCU rail when the section is powered down for low-power standby, protecting the precision of pack-current leakage measurements. The -40C to +125C range covers cell-contact environments, and the TSSOP-20 package fits the dense stacked PCBs typical of module-level BMS designs.
Được đề xuất
Test and Measurement Instrumentation
Bench instruments and automated test equipment use the SN74LVC244QAPWRQ1 to buffer relay-drive and multiplexer-select lines from a controller FPGA or MCU. The 3-state outputs let multiple controller cards share a common backplane signal set without bus contention, and pin-for-pin LVC244 interchangeability across TI, NXP, and TI commercial grades simplifies sourcing during supply disruptions. Low propagation delay at 3.3 V keeps control timing deterministic across channel counts.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SN74LVC244QAPWRQ1 — 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 | SN74LVC244AQPWRQ1 | SN74LVC244APWR | 74LVC244APW,118 | 74ALVC244PW,118 |
|---|---|---|---|---|---|
| Package | 20-TSSOP (PW) | 20-TSSOP (PW) - same | 20-TSSOP (PW) - same | 20-TSSOP (SOT360-1) - same footprint | 20-TSSOP (SOT360-1) - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | NXP Semiconductors |
| Supply Voltage | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V |
| AEC-Q100 Qualified | Yes | Yes | No | No (standard grade) | No (standard grade) |
| Output Type | 3-State, non-inverting | 3-State, non-inverting | 3-State, non-inverting | 3-State, non-inverting | 3-State, non-inverting |
| Output Enable | 2 independent OE pins | 2 OE pins | 2 OE pins | 2 OE pins | 2 OE pins |
Bảo phân biệt quan trọng
- AEC-Q100 automotive qualification (vsSN74LVC244APWR)
- Same footprint as standard grade (vsSN74LVC244APWLE)
- Second-source availability (vs74LVC244APW,118)
Ghi chú thiết kế
Decouple VCC (pin 20) with a 0.1 uF ceramic capacitor placed within 2 mm of the pin, plus a bulk 4.7 uF capacitor per octal buffer cluster. Simultaneous switching of eight outputs causes transient supply currents; insufficient decoupling shows up as glitches on neighboring logic. Per TI CMOS logic application guidance, keep the ground return path short and use a solid ground plane.
OE pins must never float. During power-up, undriven OE can leave outputs in an indeterminate state, causing bus contention on shared lines. Use a 10 k-ohm pull-up to VCC on both OE1 and OE2 so outputs default to 3-state, then drive OE low from firmware once VCC and the bus are stable. Also confirm unused inputs are tied to VCC or GND, not left floating, per standard CMOS practice.
LVC buffers dissipate negligible power at moderate switching rates, but at heavy capacitive loads (for example, eight outputs driving 100 pF each at 50 MHz) dynamic power P = C*V^2*f can approach several hundred milliwatts. The TSSOP-20 theta_JA is roughly 100 C/W, so verify junction temperature stays below 125C in high-switching-rate designs; a short ground pour under the package provides adequate spreading.
Thông tin tuân thủ
AEC-Q100 qualification per TI SN74LVC244A-Q1 datasheet Rev. D. RoHS compliance per standard TI 74LVC-Q1 offering; REACH and halogen details not stated in provided data.
