SP3244EER1-L - 3V-5.5V RS-232 Transceiver with Auto On-Line Plus | MaxLinear
Артикул: SP3244EER1-L ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $4.76 | $4,76 |
| 10 | $4.28 | $42,80 |
| 100 | $3.81 | $381,00 |
| 500 | $3.43 | $1.715,00 |
| 1.000 | $3.05 | $3.050,00 |
SP3244EER1-L Обзор
An RS-232 transceiver is a type of line driver/receiver IC that converts logic-level UART signals (typically 0V to VCC) into bipolar RS-232 voltage levels (typically +/-5V to +/-8V) required by the legacy EIA/TIA-232-F standard. Within the broader hierarchy of interface ICs, the SP3244EER1-L sits in the line transceiver family, which itself belongs to the wired communication interface category. These devices are essential bridges between modern low-voltage microcontrollers and the ubiquitous RS-232 world of industrial equipment, point-of-sale terminals, and legacy instrumentation. The integrated charge pump generates the required bipolar rails from a single supply, simplifying PCB design.
Key features include the 250 kbps slew-limited data rate, which minimizes EMI by controlling edge rates below the RS-232 standard's 30 V/us limit. The Auto On-Line Plus mode draws only microamps of supply current when cable is disconnected, making it suitable for battery-powered or thermally constrained designs. The receiver outputs remain active in shutdown, allowing ring-indicator monitoring and wake-on-ring functionality. ESD protection exceeds +/-15 kV HBM on the driver outputs and receiver inputs per IEC 61000-4-2 air discharge. Logic inputs include 5V-tolerant design when operating from a 3.3V supply, simplifying connection to 5V MCUs without level shifters.
The SP3244EER1-L leverages a proprietary charge pump architecture with four external 0.1 uF flying capacitors and four reservoir capacitors, achieving true bipolar RS-232 compliance from a single +3.3V rail. This eliminates bulky dual-rail DC-DC converters or boost topologies. The 5x5 mm QFN-32 footprint with thermal pad enables compact PCB layouts suitable for handheld and embedded designs, while the industrial temperature range of -40C to +85C supports harsh-environment deployment. Designers can leverage the SP3243E compatibility for firmware and PCB drop-in upgrades.
Typical applications include industrial RS-232 ports, point-of-sale (POS) terminals, handheld barcode scanners, embedded computing modules, factory automation controllers, and any MCU-based product needing a TIA/EIA-232-F compliant serial port. Auto On-Line Plus makes the SP3244EER1-L particularly attractive for battery-powered handheld devices where standby current budget is critical.
When designing with this part, observe the charge pump capacitor layout guidelines - place all eight 0.1 uF capacitors as close to the IC pins as possible with short, wide traces to minimize ripple on the generated bipolar rails. Note that the part number suffix '-L' designates lead-free (RoHS-compliant) packaging; the '-L/TR' variant ships on tape-and-reel. Verify maximum cable capacitance of 2500 pF for compliance with TIA/EIA-232-F at 250 kbps.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для SP3244EER1-L — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
SP3244EER1-L/TR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SP3244ECR1-L
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
SP3244EER1-L/MTR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX3244EEAI+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX3243EEAI+
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SP3244EER1-L Характеристики
| Функция | RS-232 Transceiver (3 drivers / 5 receivers) |
| Напряжение питания | 3.0 V to 5.5 V (single supply) |
| Скорость передачи данных | 250 kbps (slew-limited) |
| Driver Count | 3 |
| Receiver Count | 5 |
| Protocol | TIA/EIA-232-F, V.28, V.24 |
| Auto Shutdown Feature | Auto On-Line Plus (cable-detect) |
| Рабочая температура | -40 C to +85 C |
| Корпус | QFN-32 (5x5 mm) with thermal pad |
| Тип монтажа | Surface Mount |
| Lead-Free / RoHS | Yes (suffix -L) |
| Pin Compatibility | Drop-in with SP3243E / SP3243EB |
| Charge Pump Capacitors | 4 x 0.1 uF flying + 4 x 0.1 uF reservoir (external) |
Конфигурация выводов SP3244EER1-L
| Контакт 1 | DIN1 — TTL/CMOS driver 1 input |
| Контакт 2 | DIN2 — TTL/CMOS driver 2 input |
| Контакт 3 | DIN3 — TTL/CMOS driver 3 input |
| Контакт 4 | DOUT1 — RS-232 driver 1 output |
| Контакт 5 | DOUT2 — RS-232 driver 2 output |
| Контакт 6 | DOUT3 — RS-232 driver 3 output |
| Контакт 7 | RIN1 — RS-232 receiver 1 input |
| Контакт 8 | RIN2 — RS-232 receiver 2 input |
| Контакт 9 | RIN3 — RS-232 receiver 3 input |
| Контакт 10 | ROUT1 — TTL/CMOS receiver 1 output |
| Контакт 11 | C1+ — Charge pump flying capacitor 1 positive |
| Контакт 12 | V+ — Charge pump generated +5.5V (VCC x 2 nominal) |
| Контакт 13 | C1- — Charge pump flying capacitor 1 negative |
| Контакт 14 | C2+ — Charge pump flying capacitor 2 positive |
| Контакт 15 | C2- — Charge pump flying capacitor 2 negative |
| Контакт 16 | V- — Charge pump generated -5.5V (VCC x -2 nominal) |
| Контакт 17 | NC — Not connected (per datasheet) |
| Контакт 18 | INVALID — Invalid signal indicator (active low when all RIN inactive) |
| Контакт 19 | FORCEOFF — Force driver shutdown input (active low) |
| Контакт 20 | FORCEON — Force drivers on input (active high) |
| Контакт 21 | GND — Ground |
| Контакт 22 | VCC — +3.0V to +5.5V supply input |
| Контакт 23 | SHDN — Shutdown control (active low) |
| Контакт 24 | EN — Enable input |
| Контакт 25 | RIN4 — RS-232 receiver 4 input |
| Контакт 26 | RIN5 — RS-232 receiver 5 input |
| Контакт 27 | ROUT2 — TTL/CMOS receiver 2 output |
| Контакт 28 | ROUT3 — TTL/CMOS receiver 3 output |
| Контакт 29 | ROUT4 — TTL/CMOS receiver 4 output |
| Контакт 30 | ROUT5 — TTL/CMOS receiver 5 output |
| Контакт 31 | NC — Not connected (per datasheet) |
| Контакт 32 | NC — Not connected (per datasheet) |
Типичное применение
SP3244EER1-L подходит для 7 применениеs: Industrial RS-232 Serial Port, Point-of-Sale (POS) Terminals, Handheld Barcode Scanner, Embedded Computing Modules, Medical Device Connectivity, Test and Measurement Instrumentation, Legacy Equipment Modernization.
Industrial RS-232 Serial Port
The SP3244EER1-L's 3.0V to 5.5V supply range and TIA/EIA-232-F compliance make it a direct fit for industrial serial ports connecting microcontrollers to PLCs, HMIs, and legacy programmable logic controllers. Its integrated charge pump eliminates external bipolar power rails, while Auto On-Line Plus drops standby current to microamps when the cable is disconnected, ideal for factory-floor nodes with intermittent connectivity. The -40C to +85C industrial temperature range withstands cabinet environments without derating.
Рекомендуется
Point-of-Sale (POS) Terminals
The SP3244EER1-L's 3-driver/5-receiver configuration directly supports the full DTE-side serial port requirements of POS terminals, including TX, RX, RTS, CTS, DTR, DSR, and RI handshake lines. According to MaxLinear's datasheet, the Auto On-Line Plus feature wakes the terminal on cable connection, while the low standby current extends battery life in mobile POS units. The compact 5x5 mm QFN-32 footprint suits the small PCB area typical of handheld card readers and receipt printers.
Рекомендуется
Handheld Barcode Scanner
Battery-powered handheld barcode scanners benefit from the SP3244EER1-L's Auto On-Line Plus standby, which drops quiescent current to microamps when the scanner is cradled and no host cable is connected. According to the manufacturer datasheet, the integrated charge pump generates the bipolar RS-232 rails from a single Li-ion cell voltage, eliminating the cost and PCB area of a boost converter. The 250 kbps slew-limited data rate handles typical UPC/EAN scanner data streams without EMI issues on the cable.
Рекомендуется
Embedded Computing Modules
SOMs and embedded Linux modules that expose a legacy DB-9 RS-232 port use the SP3244EER1-L as the level translator between the SoC's 3.3V UART and the bipolar TIA/EIA-232-F interface. According to MaxLinear's datasheet, the part's 5V-tolerant logic inputs allow direct connection to 5V-tolerant SoC UART pins without level shifters. The QFN-32 footprint fits standard 0.8 mm pitch module PCBs, and the device is rated for continuous operation at full 250 kbps under industrial temperature conditions.
Рекомендуется
Medical Device Connectivity
Medical instruments that communicate over RS-232 (patient monitors, infusion pumps, diagnostic readers) use the SP3244EER1-L to provide isolated, ESD-protected serial connectivity to host computers. According to MaxLinear's datasheet, the integrated +/-15 kV HBM ESD protection on the RS-232 pins shields the downstream MCU from electrostatic discharge events typical of hospital environments. The 3.0V to 5.5V supply simplifies power tree design in battery-backed medical devices with strict leakage budgets.
Рекомендуется
Test and Measurement Instrumentation
Bench-top instruments (oscilloscopes, spectrum analyzers, signal generators) historically use RS-232 for SCPI command interfaces, and the SP3244EER1-L provides a 3.3V-compatible upgrade from legacy +/-12V discrete designs. According to MaxLinear's datasheet, the device's 250 kbps data rate accommodates the typical SCPI command throughput, while its single-supply operation reduces the instrument's internal power tree complexity. Auto On-Line Plus allows front-panel ports to enter low-power standby when not connected to a host PC.
Рекомендуется
Legacy Equipment Modernization
When modernizing equipment originally designed with +/-12V RS-232 interfaces, the SP3244EER1-L allows designers to drop in a single-supply 3.3V/5V solution without redesigning the cable interface. According to MaxLinear's datasheet, the pin-compatible SP3243E footprint enables drop-in upgrades with the added benefit of Auto On-Line Plus power savings. This is ideal for industrial customers who need to extend product life without disrupting legacy host software drivers.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для SP3244EER1-L — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | SP3244EER1-L/TR | SP3244ECR1-L | SP3244EER1-L/MTR | MAX3244EEAI+ | MAX3243EEAI+ |
|---|---|---|---|---|---|---|
| Package | QFN-32 (5x5 mm) | QFN-32 (5x5 mm) - same | QFN-32 (5x5 mm) - same | QFN-32 (5x5 mm) - same | SSOP-28 - different footprint | SSOP-28 - different footprint |
| Brand | MaxLinear | MaxLinear | MaxLinear | MaxLinear | Analog Devices (formerly Maxim) | Analog Devices (formerly Maxim) |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Data Rate | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps |
| Drivers / Receivers | 3 / 5 | 3 / 5 | 3 / 5 | 3 / 5 | 3 / 5 | 3 / 5 |
| Auto Shutdown Feature | Auto On-Line Plus | Auto On-Line Plus | None (manual SHDN only) | Auto On-Line Plus | AutoShutdown Plus | Manual SHDN |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Ключевые отличия
- Lower standby current than MAX3244E equivalent (против MAX3244EEAI+)
- Better price-performance at 32-QFN (против MAX3243EEAI+)
- Industrial temperature range as standard (против SP3244ECR1-L)
Заметки по проектированию
Place all eight charge pump capacitors (four 0.1 uF flying capacitors on C1+, C1-, C2+, C2- and four 0.1 uF reservoir capacitors on V+, V-, VCC, and one extra reservoir per datasheet) as close to the IC pins as possible. Use short, wide traces and a ground plane on the top layer to minimize ripple on the generated bipolar rails. Per MaxLinear's reference layout, place the exposed thermal pad directly over a continuous ground copper pour with at least 4 thermal vias to the inner ground plane for heat dissipation.
Limit RS-232 cable capacitance to the standard 2500 pF maximum for compliance with TIA/EIA-232-F at the 250 kbps slew-limited data rate. For longer cables (over 15 m), reduce the data rate or add a line driver in the middle. The slew-limited edge rate of approximately 30 V/us is well below the RS-232 standard maximum, reducing EMI on the cable and improving coexistence with sensitive analog circuits in the same enclosure.
Decouple the VCC pin with a 0.1 uF ceramic capacitor as close to the pin as possible, plus a 1 uF bulk capacitor for transient load steps from the charge pump. According to MaxLinear's datasheet, the supply current can spike to 30 mA during charge pump switching phases; the bulk capacitor prevents supply droop. In Auto On-Line Plus shutdown, expect a quiescent current of microamp-level, which can be measured with a 6.5-digit DMM on the VCC rail.
Do not leave the FORCEON pin floating - tie it to VCC through a 100 kohm pull-up if not driven by the MCU, otherwise the device may enter unintended shutdown. Similarly, FORCEOFF should be tied high to VCC through a pull-up to keep drivers enabled by default. The INVALID output is an open-drain signal and requires an external pull-up resistor to VCC (typically 100 kohm) to read logic-high when all receivers are active.
Информация о соответствии
RoHS compliance indicated by '-L' suffix in part number per MaxLinear product marking convention. Halogen-free status not explicitly stated in distributor data; request material declaration from MaxLinear for confirmation.
