MAX3387EEUG+ - 3V RS-232 Transceiver, 250kbps, ±15kV ESD | Maxim
N.º da peça: MAX3387EEUG+ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.42 | $8,42 |
| 10 | $7.55 | $75,50 |
| 100 | $6.18 | $618,00 |
| 500 | $5.42 | $2.710,00 |
| 1.000 | $4.85 | $4.850,00 |
MAX3387EEUG+ Visão geral
An RS-232 transceiver is a line driver/receiver IC that translates between TTL/CMOS logic levels (0-3.3V) on the UART side and the bipolar ±5V to ±15V signal levels required by the legacy RS-232 standard on the cable side. RS-232 transceivers sit at the physical layer of serial communication and remain ubiquitous in point-of-sale terminals, industrial equipment, legacy PC peripherals, and embedded debug ports despite being superseded by USB and Ethernet in many consumer applications.
Key features include ±15kV ESD protection on the RS-232 bus pins (IEC 61000-4-2 Air Gap), an integrated dual charge pump requiring only four small 0.1µF external capacitors, and an AutoShutdown Plus mode that automatically disables the charge pump and receivers when the cable is disconnected. The device operates from a single 3.0V to 5.5V supply and includes three active-low INVALID outputs for system monitoring.
The MAX3387EEUG+ uses a proprietary low-power charge pump architecture combined with Maxim's AutoShutdown Plus logic, achieving 1 µA typical supply current in shutdown while still supporting 250 kbps data rates. The dual charge pump generates +7V and -7V from the input rail using only flying capacitors, eliminating the need for a ±12V system supply.
Typical applications include PDA and cell phone data cables, palmtop computers, battery-powered equipment, embedded industrial controllers, GPS receivers, and point-of-sale (POS) terminals. Its single-supply 3V operation makes it ideal for portable, battery-powered designs where ±12V rails are unavailable.
When designing with this device, place the four charge-pump capacitors (typically 0.1µF ceramic) as close as possible to the C1+, C1-, C2+, and V+ pins. Ensure the ESD-protected bus traces are kept short and routed away from sensitive analog signals. For systems that can tolerate a slightly larger TSSOP, the MAX3387ECUG+ offers a commercial 0°C to +70°C temperature range as an alternative.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para MAX3387EEUG+ — 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:
MAX3387ECUG+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3387EEUG+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3387EEUG-T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3387EIPW
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MAX3386EIPW
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADM3312EARUZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3387EEUG+ Especificações
| Função | Transceiver |
| Protocol | RS-232 |
| Number of Drivers/Receivers | 3/3 |
| Duplex | Full |
| Taxa de dados | 250 kbps |
| Tensão de alimentação | 3.0 V to 5.5 V |
| ESD Protection (RS-232 pins) | ±15 kV (HBM); ±15 kV IEC 61000-4-2 Air Gap |
| Temperatura de operação | -40 °C to +85 °C |
| Encapsulamento | 24-TSSOP (4.40 mm) |
| Tipo de montagem | Surface Mount |
| Shutdown Current (AutoShutdown Plus) | 1 µA typical |
| External Capacitors | 4 × 0.1 µF |
| INVALID Output | Active-low, three drivers |
| Standards Compliance | EIA/TIA-232, V.28/V.24 |
| Status RoHS | Compliant |
| Lead-Free | Yes |
Configuração de pinos do MAX3387EEUG+
| Pino 1 | C1+ — Charge pump flying capacitor positive terminal |
| Pino 2 | V+ — Charge pump +5.5 V output (decoupling cap to GND) |
| Pino 3 | C1- — Charge pump flying capacitor negative terminal |
| Pino 4 | C2+ — Charge pump flying capacitor positive terminal |
| Pino 5 | C2- — Charge pump flying capacitor negative terminal |
| Pino 6 | V- — Charge pump -5.5 V output (decoupling cap to GND) |
| Pino 7 | T1OUT — RS-232 driver 1 output |
| Pino 8 | T2OUT — RS-232 driver 2 output |
| Pino 9 | T3OUT — RS-232 driver 3 output |
| Pino 10 | R1IN — RS-232 receiver 1 input |
| Pino 11 | R2IN — RS-232 receiver 2 input |
| Pino 12 | R3IN — RS-232 receiver 3 input |
| Pino 13 | R1OUT — TTL/CMOS receiver 1 output |
| Pino 14 | R2OUT — TTL/CMOS receiver 2 output |
| Pino 15 | R3OUT — TTL/CMOS receiver 3 output |
| Pino 16 | INVALID — Active-low invalid signal indicator (open-drain) |
| Pino 17 | SHDN — Active-low shutdown control input |
| Pino 18 | EN — Receiver enable input |
| Pino 19 | GND — Ground |
| Pino 20 | VCC — +3.0 V to +5.5 V supply input |
| Pino 21 | T1IN — TTL/CMOS driver 1 input |
| Pino 22 | T2IN — TTL/CMOS driver 2 input |
| Pino 23 | T3IN — TTL/CMOS driver 3 input |
| Pino 24 | FORCEON — Force-on control input (AutoShutdown Plus) |
Aplicações típicas
MAX3387EEUG+ é adequado para 6 aplicaçãos: PDA and Cell Phone Data Cables, Industrial RS-232 Port Extension, Point-of-Sale (POS) Terminals, GPS Receiver Modules, Embedded System Debug Ports, Battery-Powered Data Loggers.
PDA and Cell Phone Data Cables
The MAX3387EEUG+ is purpose-designed for PDA docking stations and cell phone data cables that draw power from a 3.3 V or 5 V host rail. Its AutoShutdown Plus feature reduces supply current to 1 µA typical when the cable is unplugged, directly extending the battery life of the handheld device. ±15 kV ESD protection on the bus pins shields the host UART from cable discharge events, eliminating the need for external TVS diode arrays. At 250 kbps, the part handles the full RS-232 throughput required for high-speed data sync. The 24-TSSOP package measures only 4.40 mm wide, fitting into the tight mechanical envelope of retractable cable assemblies.
Recomendado
Industrial RS-232 Port Extension
Embedded industrial controllers, programmable logic controllers (PLCs), and human-machine interface (HMI) terminals rely on the MAX3387EEUG+ to add RS-232 ports without requiring a ±12 V supply rail. The integrated charge pump generates ±5.5 V from a single 3.0-5.5 V rail using only four 0.1 µF capacitors, simplifying the power tree. The -40 °C to +85 °C industrial temperature rating ensures reliable operation in factory automation cabinets and outdoor enclosures. The three-driver/three-receiver configuration supports the full DB9 signal set (TX, RX, RTS, CTS plus one auxiliary) used for legacy serial protocols like Modbus RTU.
Recomendado
Point-of-Sale (POS) Terminals
POS terminals in retail environments connect to barcode scanners, receipt printers, and cash drawers via legacy DB9 RS-232 ports, where the MAX3387EEUG+ provides robust signal translation. The ±15 kV ESD rating meets the IEC 61000-4-2 air-discharge requirements for retail equipment handling frequent cable insertions by customers and cashiers. The 3.3 V single-supply operation allows the terminal's main processor to power the transceiver directly without an auxiliary regulator. Active-low INVALID outputs feed back to the processor for cable-presence detection and intelligent power management.
Recomendado
GPS Receiver Modules
Handheld GPS receivers output NMEA 0183 sentences over RS-232 at 4800 to 115200 baud, and the MAX3387EEUG+ converts the 3.3 V CMOS UART to the ±5 V levels required by the DB9 connector. The 250 kbps data rate comfortably exceeds the NMEA 4800-115200 baud requirement, providing margin for higher-rate binary GPS protocols. AutoShutdown Plus drops quiescent current to 1 µA when the GPS receiver is idle, critical for multi-day battery life on backpacking and marine applications. The 24-TSSOP footprint fits inside the compact enclosure of handheld GPS units.
Recomendado
Embedded System Debug Ports
Many embedded development boards retain a 3.3 V RS-232 debug port for legacy terminal access, and the MAX3387EEUG+ provides the level translation from 3.3 V CMOS UART to RS-232 levels. The integrated charge pump simplifies the schematic and reduces BOM count compared to discrete transistor level shifters. Three drivers and three receivers support hardware flow control (RTS/CTS) needed for high-speed firmware upload via bootloaders. The -40 °C to +85 °C industrial temperature grade allows the same debug hardware to be used for both development and production test fixtures.
Recomendado
Battery-Powered Data Loggers
Remote data loggers for environmental monitoring and asset tracking use the MAX3387EEUG+ for the configuration and retrieval port, drawing power from lithium primary cells or rechargeable Li-ion packs. The AutoShutdown Plus feature reduces quiescent current to 1 µA between log retrieval sessions, dramatically extending battery life for remote deployments. The ±15 kV ESD protection survives field handling and cable abuse in outdoor installations. The 3.0 V minimum supply enables direct operation from two AA alkaline cells (3.0 V nominal), eliminating boost regulators in low-duty-cycle loggers.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX3387EEUG+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX3387ECUG+ | MAX3387EEUG+T | MAX3387EEUG-T | MAX3387EIPW | MAX3386EIPW | ADM3312EARUZ |
|---|---|---|---|---|---|---|---|
| Package | 24-TSSOP (4.40 mm) | 24-TSSOP - same | 24-TSSOP - same | 24-TSSOP - same | 24-TSSOP - same | 24-TSSOP - same | 24-TSSOP - same |
| Brand | Analog Devices (formerly Maxim Integrated) | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Function | 3-driver / 3-receiver RS-232 transceiver | 3/3 RS-232 transceiver | 3/3 RS-232 transceiver | 3/3 RS-232 transceiver | 3/3 RS-232 transceiver | 3-driver / 2-receiver RS-232 transceiver | 3-driver / 3-receiver RS-232 transceiver |
| Data Rate | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 250 kbps | 460 kbps |
| 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 | 2.7 V to 3.6 V |
| ESD Protection (Bus Pins) | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV |
| AutoShutdown Plus | Yes (1 µA typical shutdown current) | Yes | Yes | Yes | Yes | Yes | No (manual shutdown only) |
| Operating Temperature | -40 °C to +85 °C (E grade) | 0 °C to +70 °C (C grade) | -40 °C to +85 °C (E grade) | -40 °C to +85 °C (E grade) | -40 °C to +85 °C (E grade, automotive) | -40 °C to +85 °C (E grade) | -40 °C to +85 °C |
Principais diferenciais
- AutoShutdown Plus with 1 µA typical quiescent current (vs ADM3312EARUZ)
- Extended -40°C to +85°C industrial temperature range (vs MAX3387ECUG+)
- ±15 kV IEC 61000-4-2 ESD protection on bus pins (vs MAX3232)
Notas de projeto
Place the four 0.1 µF charge-pump capacitors (on C1+, C1-, C2+, V+) as close as possible to their respective pins using short, wide traces to minimize parasitic inductance and ESR. Use X7R or X5R ceramic dielectric capacitors rated for at least 10 V to provide adequate margin over the ±5.5 V charge pump outputs. Keep RS-232 bus traces (T1OUT-T3OUT, R1IN-R3IN) short and routed away from noisy switching nodes and sensitive analog circuitry to preserve signal integrity and ESD immunity. The exposed thermal pad (if any) should be soldered to a ground copper pour for mechanical stability and thermal dissipation.
The MAX3387EEUG+ generates the ±5.5 V RS-232 levels internally from a single 3.0 V to 5.5 V supply rail via its dual charge pump, requiring only four 0.1 µF external capacitors - no ±12 V supply is required, simplifying the system power tree. Add a 0.1 µF ceramic bypass capacitor directly on the VCC supply pin and a 10 µF bulk capacitor on the supply rail near the IC to suppress transient currents drawn by the charge pump during high-speed data transmission, which can momentarily draw 10-20 mA peaks.
Do not connect the V+ and V- pins together or short them to VCC or GND - the charge pump generates bipolar rails that must be decoupled separately. When using AutoShutdown Plus mode, ensure the FORCEON and EN control pins are tied to valid logic states (FORCEON high for always-on, or controlled by a GPIO) to prevent undefined shutdown behavior. The INVALID output is open-drain and requires an external pull-up resistor (typically 100 kΩ to VCC) to read a logic-high level. Do not exceed the absolute maximum VCC rating of 6.0 V or ESD ratings may be compromised.
Informações de conformidade
RoHS compliant per Analog Devices product page. Industrial -40C to +85C operating range (E suffix). Lead-free and halogen-free per Maxim Integrated materials disclosure. AEC-Q100 not qualified for automotive - select MAX3387EIPW for automotive PPAP.
