SN74LVT244APWR - 3.3V ABT Octal Buffer/Line Driver | TI
料号： SN74LVT244APWR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.75 | $0.75 |
| 10 | $0.62 | $6.20 |
| 100 | $0.45 | $45.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.29 | $290.00 |
SN74LVT244APWR 概述
A buffer and line driver is a digital logic IC that increases the drive current of a weak signal source so it can fan out to multiple loads or drive long bus lines. Within the semiconductor hierarchy, the SN74LVT244APWR belongs to the logic IC family, specifically buffers, drivers and receivers, under the broad category of integrated circuits. Line drivers sit between a microcontroller or FPGA bus and memory, peripherals, or backplanes, restoring signal integrity and isolating capacitive loading.
Key features include non-inverting 3-state outputs that enter high impedance when disabled, allowing multiple devices to share a common bus; separate OE control for each 4-bit element, enabling half-width bus operation; LVT-speed propagation delays suited for address/data buffering; and 5V-tolerant TTL-level input logic so a 3.3V device can interface with legacy 5V systems.
Technically, the ABT/LVT BiCMOS process combines the low static power of CMOS inputs with the high output drive of bipolar transistors, delivering strong sink and source current with fast edge rates while keeping supply current low in the static state.
Typical applications include 8-bit address/data bus buffering in embedded systems, memory interface isolation, backplane line driving in industrial control, and 3.3V-to-5V TTL signal translation in mixed-voltage designs.
Design consideration: tie unused OE inputs to VCC to guarantee outputs are enabled, and use short ground returns to limit ground bounce from fast bipolar output edges.
This page synthesizes distributor availability, drop-in alternatives, pinout, and practical design notes not consolidated in the manufacturer datasheet.
直接替换替代料： SN74LVT244APWR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SN74LVT244APWR （相同外形与封装尺寸） ——差异在于 Output Enable, Output Type, Package, Supply Voltage Range.
快速对比工具——选择替代料号进行并排对比：
SN74LVTH244APWR
✅ 直接替换📋 参考替代料（不在目录中）
SN74LVC244APWR
✅ 直接替换✓ 有现货
$0.21 / 个
查看数据手册 →SN74LVCH244APWR
✅ 直接替换📋 参考替代料（不在目录中）
SN74LV244APWR
✅ 直接替换📋 参考替代料（不在目录中）
SN74HC244APWR
✅ 直接替换📋 参考替代料（不在目录中）
74LVTH244MTC
✅ 直接替换📋 参考替代料（不在目录中）
SN74LVT244APWR 最大额定值与电气特性
| Logic Function | Octal buffer / line driver, non-inverting |
| Technology Family | LVT (ABT, 3.3V BiCMOS) |
| Supply Voltage Range | 2.7 V to 3.6 V |
| Input Type | TTL-compatible CMOS inputs |
| 输出类型 | 3-state, non-inverting |
| 通道数 | 8 (2 elements x 4 bit) |
| Output Enable | 2 separate active-low OE inputs |
| 特性 | Bus-hold capable family (per TI product page) |
| 封装 | 20-TSSOP (PW) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Pricing (1 pc) | See tiers; as of 2026-09-14 |
SN74LVT244APWR 引脚配置
| 引脚 1 | OE1 — Output-enable input 1 (active low) |
| 引脚 2 | 1A1 — Data input, element 1 bit 1 |
| 引脚 3 | 1Y1 — 3-state output, element 1 bit 1 |
| 引脚 4 | 1A2 — Data input, element 1 bit 2 |
| 引脚 5 | 1Y2 — 3-state output, element 1 bit 2 |
| 引脚 6 | 1A3 — Data input, element 1 bit 3 |
| 引脚 7 | 1Y3 — 3-state output, element 1 bit 3 |
| 引脚 8 | 1A4 — Data input, element 1 bit 4 |
| 引脚 9 | 1Y4 — 3-state output, element 1 bit 4 |
| 引脚 10 | GND — Ground |
| 引脚 11 | 2Y1 — 3-state output, element 2 bit 1 |
| 引脚 12 | 2A1 — Data input, element 2 bit 1 |
| 引脚 13 | 2Y2 — 3-state output, element 2 bit 2 |
| 引脚 14 | 2A2 — Data input, element 2 bit 2 |
| 引脚 15 | 2Y3 — 3-state output, element 2 bit 3 |
| 引脚 16 | 2A3 — Data input, element 2 bit 3 |
| 引脚 17 | 2Y4 — 3-state output, element 2 bit 4 |
| 引脚 18 | 2A4 — Data input, element 2 bit 4 |
| 引脚 19 | OE2 — Output-enable input 2 (active low) |
| 引脚 20 | VCC — Power supply, 2.7V to 3.6V |
典型应用
SN74LVT244APWR 适用于 6 应用s: Microprocessor Address/Data Bus Buffering, Memory Interface Isolation, Industrial Control Backplane Line Driving, 3.3V to 5V TTL Signal Translation, Shared Peripheral Module Buses, LED Status and Display Segment Driving.
Microprocessor Address/Data Bus Buffering
The SN74LVT244APWR is a natural fit for 8-bit address or data bus buffering in 3.3V embedded systems because its ABT BiCMOS output stage provides strong sink and source drive that restores signal integrity on heavily loaded buses, while its two independent 4-bit elements each with a separate active-low output enable allow half-bus control for shared resources. In a typical layout the microcontroller bus drives the A inputs, and the regenerated Y outputs drive memory chips or peripheral devices. Because inputs are TTL-compatible at a 2.7V to 3.6V supply, the buffer also bridges legacy 5V TTL control signals into the 3.3V domain. The trade-off versus pure CMOS buffers is slightly higher static supply current, accepted in exchange for superior drive and edge quality on capacitive loads.
推荐
Memory Interface Isolation
Flash, SRAM, and SDRAM buses place large capacitive loads on controller outputs; inserting the SN74LVT244APWR between controller and memory isolates that loading and preserves edge rates. The 3-state outputs are essential here: when OE is driven high, the buffer releases the bus so memory can drive the data lines during reads or so another master can take ownership. Operating from 2.7V to 3.6V matches standard 3.3V memory rails, and TTL-compatible thresholds tolerate slow or degraded input edges from long traces. Placing the buffer close to the controller with short ground returns minimizes ground bounce from the fast bipolar edges. Designers should verify propagation delay budgeting, since the buffer adds delay to both address and data paths in synchronous memory interfaces.
推荐
Industrial Control Backplane Line Driving
Industrial PLC backplanes and I/O racks benefit from the SN74LVT244APWR's combination of robust bipolar drive, 3-state bus sharing, and TTL input compatibility, which tolerate the noisy, slow-edged signals common on field wiring interfaces. The two 4-bit elements with separate output enables allow one device to buffer two independent control groups, such as a 4-bit status output and a 4-bit command output, each gated by a different controller signal. The 2.7V to 3.6V supply range absorbs regulation variation on distributed 3.3V backplanes. Compared with the CMOS SN74LV244APWR, the LVT part sustains heavier fan-out per channel, an advantage when one buffer drives multiple slave cards. Recommended products include TI isolation and driver companions from the same logic family.
推荐
3.3V to 5V TTL Signal Translation
Many legacy boards still mix 5V TTL subsystems with modern 3.3V controllers; the SN74LVT244APWR was designed specifically for this scenario, operating its core from a 2.7V to 3.6V supply while accepting TTL-level inputs that interface cleanly with 5V system environments, as documented in the FindIC product overview. Outputs driven from the 3.3V rail produce logic levels recognized as valid TTL HIGH, so a single device both buffers and logically translates the domain. Engineers must still confirm that no 5V source exceeds the recommended output voltage limits on the Y pins, using series resistors or a direction-controlled transceiver where 5V drive is present. This approach is lower cost and lower delay than dedicated level-shifter ICs in purely unidirectional paths.
推荐
Shared Peripheral Module Buses
When several peripheral modules share one processor bus, the SN74LVT244APWR provides the arbitration-friendly 3-state outputs needed for bus mastership handoff: each card buffers its drive onto the common bus, and a controller disables a card's four outputs via OE before another card enables its own. The BiCMOS output drive keeps rise and fall times fast despite the distributed capacitance of a multidrop backplane, and TTL-compatible inputs remain reliable with varying drive strengths from different cards. The 2.7V to 3.6V operating range tolerates bus-supply sag under peak module load. Designers should enforce a one-hot enable scheme in firmware to prevent bus contention, since simultaneous enabled outputs cause crowbar currents that stress the device.
推荐
LED Status and Display Segment Driving
Although intended as a line driver, the SN74LVT244APWR's bipolar output stage is well suited to driving LED status indicators and display segment lines from a 3.3V logic source, since it sinks and sources significantly more current than a standard CMOS gate output. The 3-state outputs let a supervisor disable all indicators during brownout or test modes, and the two independently enabled 4-bit banks allow separate control of, for example, four front-panel LEDs and four backlight segments. Series resistors sized to the LED forward current keep the output within recommended ratings, and the 2.7V to 3.6V supply accommodates battery-fed indicator rails. Thermal considerations are minor at indicator currents but should be checked for dense LED banks.
推荐
推荐产品汇总
工程参考数据： SN74LVT244APWR ——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 | SN74LVTH244APWR | SN74LVC244APWR | SN74LVCH244APWR | SN74LV244APWR | 74LVTH244MTC |
|---|---|---|---|---|---|---|
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (MTC) - equivalent |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi (Fairchild) |
| Technology | LVT (ABT BiCMOS, 3.3V) | LVTH (ABT BiCMOS, 3.3V) | LVC (CMOS) | LVCH (CMOS + bus hold) | LV (CMOS) | LVTH (BiCMOS, 3.3V) |
| Supply Voltage | 2.7V to 3.6V | 2.7V to 3.6V | 1.65V to 3.6V | 2.3V to 3.6V | 2.3V to 3.6V | 2.7V to 3.6V |
| Input Thresholds | TTL-compatible (5V interfacing) | TTL-compatible | CMOS (VIH = 2V at 3.3V) | TTL-compatible with bus hold | CMOS | TTL-compatible |
| Outputs | 8 x non-inverting 3-state | 8 x non-inverting 3-state | 8 x non-inverting 3-state | 8 x non-inverting 3-state | 8 x non-inverting 3-state | 8 x non-inverting 3-state |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
| Sourcing Channel | Rochester Electronics (DigiKey) | TI primary (DigiKey, Mouser) | TI primary | TI primary | TI primary | onsemi channel |
关键差异点
- TTL-compatible input thresholds for 5V system interfacing （对比 SN74LVC244APWR)
- Bipolar BiCMOS output drive （对比 SN74LV244APWR)
- Actively manufactured primary-source equivalent （对比 SN74LVTH244APWR)
设计说明
Place a 0.1uF ceramic decoupling capacitor within 2 mm of the VCC pin (pin 20) and GND (pin 10). The bipolar output stage of LVT technology draws transient currents with fast edges, so add a 4.7uF bulk capacitor per eight buffers on shared supply planes. Route the GND return of driven loads back to pin 10 with short, wide traces to limit ground bounce, which on LVT parts can cause spurious output glitches on neighboring channels.
Never leave OE1 (pin 1) or OE2 (pin 19) floating; an undetermined enable state causes bus contention and excess current. Tie unused OE pins to GND (enabled) or VCC (disabled) with a 10k resistor. Also do not exceed the 3.6V supply maximum - 5V tolerance applies to TTL logic levels at the inputs, not to VCC or the outputs. Verify absolute-maximum output voltage limits before connecting the Y outputs to any 5V rail.
For bus lines longer than roughly 15 cm, add 22-33 ohm series resistors at the Y outputs to damp reflections caused by the fast bipolar edge rates of LVT technology. Where multiple drivers share a bus, enforce one-hot output-enable sequencing in firmware, allowing one transition period (high-Z to active) before the next driver enables, to prevent simultaneous-drive crowbar currents that stress the devices.
合规信息
RoHS compliance per distributor listings for TI 244-type logic in PW package. REACH and conflict-minerals status not stated in provided data; verify with TI quality portal.
