SN74LVC2244APWR - 8-Bit Buffer/Driver 26Ω 3-State | Texas Instruments
N.º da peça: SN74LVC2244APWR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.95 | $0,95 |
| 10 | $0.84 | $8,40 |
| 100 | $0.71 | $71,00 |
| 500 | $0.58 | $290,00 |
| 1.000 | $0.46 | $460,00 |
SN74LVC2244APWR Visão geral
What is an octal buffer with 3-state outputs? An octal buffer is a non-inverting digital driver that replicates a logic signal on its inputs to its outputs while providing increased drive strength; the 3-state feature lets each output be placed in a high-impedance state under the control of an output-enable pin so that multiple devices can share a bus without contention. Buffers belong to the larger family of Logic ICs > Buffers, Drivers, Receivers and serve as building blocks alongside latches, transceivers, and registered drivers in modern digital systems.
Key differentiating features of the SN74LVC2244A include bus-hold free I/O, partial-power-down support through Ioff circuitry that prevents back-drive current when VCC is removed, and ESD protection exceeding 2000 V (HBM) per the JESD22-A114 standard. The device is specified across the -40 °C to +85 °C industrial temperature range and is rated for a typical VOLP (output ground bounce) of less than 0.8 V at VCC = 3.3 V, making it well suited for mixed-voltage systems that interface 5 V legacy peripherals with 3.3 V controllers.
Architecturally, the SN74LVC2244A splits its eight channels into two banks of four, each bank gated by its own active-low output-enable pin (1OE and 2OE), so two independent sub-systems can be controlled from one IC. The 26 Ω on-chip damping, combined with typical VOLV/VOHV undershoot figures well below 1 V, allows the device to be inserted directly onto unterminated PCB traces of moderate length without external resistor packs. The PW (TSSOP-20) footprint is one of the most common surface-mount logic footprints and pairs naturally with TI's broad LVC, LVCH, and LVC1G families for multi-rail designs.
Typical applications include memory and address bus buffering on motherboards and DSP systems, isolation between hot-swap controllers and backplanes, level translation between 3.3 V ASICs and 5 V peripherals, and I/O expansion for microcontrollers that lack sufficient drive strength on shared buses. Designers of portable instruments and industrial PLCs particularly value the wide 1.65-3.6 V supply range, which simplifies battery and 3.3 V/2.5 V/1.8 V mixed-voltage designs.
When laying out the SN74LVC2244APWR, place bypass capacitors (typically 0.1 µF ceramic) within 2-3 mm of the VCC and GND pins, and keep the two 4-bit banks' enable traces well separated to avoid coupling. Verify that the driven trace length does not exceed the 5.5 ns propagation budget - for traces shorter than ~30 cm on FR-4 the 26 Ω internal resistance is sufficient to suppress reflections.
This page synthesizes distributor pricing across multiple regions, datasheet-anchored specifications, drop-in TSSOP-20 alternatives, and practical design notes that are not collected in a single location on the manufacturer product page, giving procurement and design engineers a one-stop reference for the SN74LVC2244APWR.
Alternativas drop-in para SN74LVC2244APWR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SN74LVC2244APW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74LVC2244APWRG4
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74LVC2244APWT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74LVCH2244APWR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
74LCX2244MTC
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC74LCX2244DTG
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SN74LVC2244APWR Classificações máximas e características elétricas
| Função | Octal Buffer / Line Driver with 3-State Outputs |
| Number of Channels | 8 (2 elements of 4 bits per element) |
| Logic Family | LVC (Low-Voltage CMOS) |
| Polarity | Non-Inverting |
| Supply Voltage (VCC) | 1.65 V to 3.6 V |
| Input Voltage Tolerance | Up to 5.5 V (5 V tolerant inputs) |
| Propagation Delay (tpd) | 5.5 ns max at 3.3 V VCC |
| Output Drive | ±24 mA at 3.3 V |
| Output Series Resistance | 26 Ω equivalent (built-in) |
| Tipo de saída | 3-State (per bank via 1OE / 2OE) |
| Temperatura de operação | -40 °C to +85 °C |
| Ioff / Partial Power Down | Yes (supports live insertion) |
| ESD Protection (HBM) | ≥ 2000 V per JESD22-A114 |
| Quiescent Current (ICC) | 10 µA max |
| Encapsulamento | TSSOP-20 (PW) 6.5 mm x 4.4 mm |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 (per JEDEC J-STD-020) |
| Lead Free / RoHS | Yes / Compliant |
Configuração de pinos do SN74LVC2244APWR
| Pino 1 | 1OE- — Output enable for bank 1, active low |
| Pino 2 | 1A1 — Bank 1 data input 1 |
| Pino 3 | 1Y4 — Bank 1 data output 4 (with 26 Ω series damping) |
| Pino 4 | 1A2 — Bank 1 data input 2 |
| Pino 5 | 1Y3 — Bank 1 data output 3 (with 26 Ω series damping) |
| Pino 6 | 1A3 — Bank 1 data input 3 |
| Pino 7 | 1Y2 — Bank 1 data output 2 (with 26 Ω series damping) |
| Pino 8 | 1A4 — Bank 1 data input 4 |
| Pino 9 | 1Y1 — Bank 1 data output 1 (with 26 Ω series damping) |
| Pino 10 | GND — Ground reference |
| Pino 11 | 2Y1 — Bank 2 data output 1 (with 26 Ω series damping) |
| Pino 12 | 2A4 — Bank 2 data input 4 |
| Pino 13 | 2Y2 — Bank 2 data output 2 (with 26 Ω series damping) |
| Pino 14 | 2A3 — Bank 2 data input 3 |
| Pino 15 | 2Y3 — Bank 2 data output 3 (with 26 Ω series damping) |
| Pino 16 | 2A2 — Bank 2 data input 2 |
| Pino 17 | 2Y4 — Bank 2 data output 4 (with 26 Ω series damping) |
| Pino 18 | 2A1 — Bank 2 data input 1 |
| Pino 19 | 2OE- — Output enable for bank 2, active low |
| Pino 20 | VCC — Supply voltage (1.65 V to 3.6 V) |
Aplicações típicas
SN74LVC2244APWR é adequado para 7 aplicaçãos: Memory and Address Bus Buffering, Level Translation Between 3.3 V and 5 V Logic, FPGA and CPLD I/O Bank Expansion, Hot-Swap and Live Insertion Cards, Industrial PLC and Control Module I/O, Portable and Battery-Powered Instruments, Server and Storage Backplane Fan-out.
Memory and Address Bus Buffering
The SN74LVC2244APWR is widely used to buffer microprocessor address and data buses on motherboards, DSP cards, and FPGA development platforms. Its 26 Ω on-chip output series resistors suppress transmission-line reflections on unterminated address/data traces, eliminating the need for external resistor packs that would otherwise clutter the PCB and consume board area. The 5.5 ns tpd at 3.3 V is well below the cycle time of most 32-bit microcontrollers operating below 100 MHz, and the ±24 mA drive strength easily handles 8-10 loads per bus segment. Located between the CPU and SDRAM/flash, the SN74LVC2244A also provides isolation so that hot-swap insertion does not disturb live memory contents.
Recomendado
Level Translation Between 3.3 V and 5 V Logic
The SN74LVC2244APWR serves as a unidirectional 3.3 V-to-5 V level translator for legacy peripherals in mixed-voltage systems. Because its inputs accept voltages up to 5.5 V even when VCC is only 1.65 V-3.6 V, the part can receive 5 V CMOS signals safely while running from a lower-voltage rail. The 26 Ω output damping and 3-state control allow multiple translated buses to share a common connector without contention. This is particularly valuable when modern low-voltage controllers must interface with older 5 V peripherals such as industrial sensors, character LCDs, or legacy memory-mapped I/O devices. The Ioff partial-power-down feature is critical here because it blocks back-drive current through the SN74LVC2244A when a downstream subsystem is unpowered.
Recomendado
FPGA and CPLD I/O Bank Expansion
FPGAs and CPLDs often run out of user I/O when driving multi-bank memory or expansion headers, and the SN74LVC2244APWR provides an inexpensive fan-out solution. The TSSOP-20 (PW) footprint fits easily on the periphery of any BGA-484 / QFP-176 FPGA footprint, adding eight high-drive non-inverting outputs with 3-state control per chip. Designers use the device to replicate low-current FPGA outputs to off-board ribbon cables without exceeding the FPGA's 4-12 mA per-pin drive limit. The 5 V input tolerance also lets the SN74LVC2244APWR receive signals from 5 V peripheral cards while the FPGA itself runs from a 3.3 V I/O bank. Each of the two 4-bit banks can be independently enabled for selective bus isolation during partial reconfiguration.
Recomendado
Hot-Swap and Live Insertion Cards
When CompactPCI, VME, or ATCA cards must be inserted into a powered backplane, the SN74LVC2244APWR's Ioff partial-power-down feature guarantees that no current flows through the device's I/O pins before VCC has stabilized. The built-in 26 Ω series resistors damp the inrush transients that occur when long PCB stubs momentarily become stubs during insertion. Both 1OE- and 2OE- active-low enables allow the system controller to keep outputs in high-impedance until the card has enumerated and been granted bus access. This makes the SN74LVC2244APWR a common choice for industrial backplane designs where maintenance is performed on energized racks.
Recomendado
Industrial PLC and Control Module I/O
In industrial programmable logic controllers (PLCs), the SN74LVC2244APWR provides bidirectional bus isolation between the backplane logic and the field wiring terminals. Its 5 V input tolerance and -40 °C to +85 °C industrial temperature grade support the wide operating ranges required by IEC 61131-2 industrial control standards. The 26 Ω output damping allows direct drive of 24 V logic inputs downstream via simple resistive divider networks, while the 3-state enables let the CPU scan I/O banks sequentially without bus contention. Wide VCC operation (1.65 V-3.6 V) also permits the same IC to be used across 2.5 V and 3.3 V PLC variants, simplifying inventory for module families.
Recomendado
Portable and Battery-Powered Instruments
The 1.65 V-3.6 V wide-supply range of the SN74LVC2244APWR matches the voltage range of single-cell Li-ion (3.0-4.2 V), two-cell alkaline (2.0-3.4 V), and energy-harvested supplies used in portable measurement instruments. The 10 µA max quiescent current minimizes battery drain when logic rails are gated off during sleep cycles, and the Ioff feature ensures no parasitic current flows through the device when VCC is removed. Designers of handheld oscilloscope probes, data loggers, and field-service tools rely on the SN74LVC2244APWR to buffer display and sensor buses without adding a voltage regulator. The TSSOP-20 (PW) package weighs only 0.05 grams, an important consideration for wearable test equipment.
Recomendado
Server and Storage Backplane Fan-out
Inside 1U/2U servers and JBOD storage enclosures, the SN74LVC2244APWR buffers SAS/SATA backplane signals, SMBus sidebands, and front-panel LED scan chains. Its industrial -40 °C to +85 °C temperature range is rated for the 70 °C internal chassis environments typical of hot-aisle datacenter deployments. The 26 Ω output series damping matches the 85 Ω / 100 Ω differential impedances commonly used on backplane striplines, eliminating the need for 0402 resistor arrays that would complicate reflow. Two independent 4-bit banks map cleanly to the SAS data lanes (4 lanes per bank) that fan out from a single expander chip to multiple drive bays.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SN74LVC2244APWR — comparação, orientação de projeto e informações de conformidade.
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Comparação com alternativas
| Parâmetro | Este produto | SN74LVC2244APW | SN74LVC2244APWRG4 | SN74LVCH2244APWR | 74LCX2244MTC | MC74LCX2244DTG |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | onsemi |
| Package | TSSOP-20 (PW) | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (PW) - same | TSSOP-20 (MTC) - same | TSSOP-20 (DTG) - same |
| VCC Operating Range | 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 | 2.0 V to 3.6 V |
| Propagation Delay (max @ 3.3 V) | 5.5 ns | 5.5 ns | 5.5 ns | 5.5 ns | 6.5 ns | 6.5 ns |
| Output Series Resistance | 26 Ω equivalent | 26 Ω | 26 Ω | 26 Ω | 26 Ω | 26 Ω |
| Bus-Hold on Inputs | No | No | No | Yes (~50 µA typical) | No | No |
| Output Drive (±) at 3.3 V | 24 mA | 24 mA | 24 mA | 24 mA | 24 mA | 24 mA |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Approximate Unit Price (cut tape, as of 2026-10-10) | $0.95 | $0.95 | $0.95 | $1.05 | $0.85 | $0.90 |
Principais diferenciais
- Built-in 26 Ω output series damping eliminates external termination (vs SN74LVC244A)
- 5 V input tolerance with 3.3 V VCC operation (vs 74LCX2244MTC)
- TSSOP-20 (PW) package with same footprint across LVC and LVCH families (vs MC74LCX2244DTG)
Notas de projeto
Place a 0.1 µF X7R ceramic decoupling capacitor within 3 mm of the SN74LVC2244APWR's VCC pin (pin 20) and a bulk 1 µF-10 µF tantalum or polymer capacitor on the same VCC node near the device. The TSSOP-20 (PW) thermal pad is not present on this package, so all thermal dissipation goes through the GND pin (pin 10); ensure pin 10 is tied to a flooded ground plane of at least 25 mm² to keep junction temperature within the -40 °C to +85 °C industrial range under heavy switching loads.
The 26 Ω output series resistors inside the SN74LVC2244APWR are designed to damp reflections on traces with a characteristic impedance of approximately 50 Ω, so use controlled-impedance PCB traces of 45-55 Ω impedance for point-to-point and lightly-loaded multi-drop connections. For high-fanout buses (>4 loads) add a 33 Ω series resistor at each receiver input to provide additional damping; relying solely on the internal 26 Ω damping may not be sufficient when stubs exceed 25 mm.
Do not confuse the SN74LVC2244APWR with the SN74LVC244A - although both share the TSSOP-20 (PW) footprint, the 244A lacks the 26 Ω output damping that the 2244A provides. Substituting a 244A onto a 2244A layout will result in ringing on unterminated buses above ~50 MHz. Also verify output-enable polarity (active-low 1OE- / 2OE-, pins 1 and 19) at design review - some competing octal buffers use active-high enables, which would deadlock the bus if substituted.
Estimated supply-current budget: with eight outputs switching simultaneously at 10 MHz and a 15 pF load per output, the SN74LVC2244APWR will draw approximately 1.5 mA of dynamic supply current (CV²f × N) on top of the 10 µA quiescent ICC, so a 2.5 mA budget per IC is reasonable for power-rail sizing. Note this is a derivation, not a guaranteed datasheet figure - consult the TI Dynamic Supply Current graph in the SN74LVC2244A datasheet for the rated worst case.
Informações de conformidade
TSSOP-20 (PW) package is JEDEC MS-153-compliant, Pb-free (RoHS), halogen-free per TI material declaration. Not AEC-Q100 qualified - choose the SN74LVC2244APWR-Q1 for automotive systems; the standard PW part is graded for industrial -40 °C to +85 °C use only.
