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Texas Instruments MAX3237EIDBR
- Part No.:
- MAX3237EIDBR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX3237EIDBR.pdf
- Description:
- IC TRANSCEIVER FULL 5/3 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,517
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Product details
Overview
MAX3237EIDBR from Texas Instruments is a 3-V to 5.5-V multichannel RS-232 line driver/receiver IC featuring five drivers, three receivers, ±15-kV IEC61000-4-2 ESD protection, 1-Mbit/s data rate (MBAUD = VCC), and low 1-mA standby current. It operates across –40°C to 85°C and uses four 0.1-µF external capacitors for charge-pump voltage generation - deployed in industrial portable equipment requiring robust serial interface with minimal external components.
For engineers reviewing the MAX3237EIDBR datasheet, MAX3237EIDBR pinout, MAX3237EIDBR application, or MAX3237EIDBR equivalent, this device delivers verified TIA/EIA-232-F and ITU v.28 compliance, high-impedance control via EN/SHDN pins, and dual-mode slew-rate control (6–150 V/µs) for noise-sensitive embedded serial links.
Technical Context
The MAX3237EIDBR integrates a dual charge-pump circuit enabling ±15-V RS-232 output levels from a single 3-V to 5.5-V supply. Its five drivers support independent enable/disable via SHDN (global shutdown) and EN (receiver output tri-state), while ROUT1B remains always active regardless of control states.
It supports two data-rate modes: 250 kbit/s (MBAUD = GND) and 1 Mbit/s (MBAUD = VCC), with driver slew rate programmable between 6 V/µs and 150 V/µs. Receiver input thresholds are temperature-stable (VIT+ = 1.5–2.4 V, VIT– = 0.6–1.5 V), and hysteresis is fixed at 0.5 V for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V - enables direct integration with 3.3-V or 5-V logic systems without level-shifting. |
| Data Rate | Up to 1 Mbit/s - supports high-speed UART communication when MBAUD = VCC; 250 kbit/s default mode reduces EMI. |
| ESD Protection | ±15 kV HBM, ±8 kV IEC61000-4-2 contact, ±15 kV air-gap - eliminates need for external TVS diodes on RS-232 I/O lines. |
| Driver Outputs | 5 channels (DOUT1–DOUT5) - provides full RS-232 port expansion (TX, RTS, DTR, DSR, CD) from one IC. |
| Receiver Inputs | 3 channels (RIN1–RIN3) plus always-active ROUT1B - supports standard 3-wire or extended 5-wire RS-232 configurations. |
| Standby Current | 1 mA typical - extends battery life in handheld devices during idle or sleep states. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment in harsh thermal environments. |
Pinout & Package
MAX3237EIDBR is housed in a 28-pin SSOP (DB) package, 8.45 mm × 10.55 mm, 1.0 mm max height, RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28 | Physical pin numbers (SSOP-28) | Exact mapping per TI DB0028A outline; pin 1 index area located at top-left corner with notch orientation. |
| C1+, C1−, C2+, C2− | Charge-pump capacitor terminals | Connect four 0.1-µF ceramic capacitors to generate ±15-V RS-232 compliant outputs from single supply. |
| DIN1–DIN5 | Logic-level input to drivers | Accept 3.3-V or 5-V CMOS/TTL inputs directly - no level translation required even at 3.3-V VCC. |
| DOUT1–DOUT5 | RS-232 driver outputs | Deliver true ±15-V swing (±5.4 V min) into 3-kΩ load - meets TIA/EIA-232-F output voltage spec. |
| RIN1–RIN3 | RS-232 receiver inputs | Accept ±25-V input range with 3–7 kΩ input resistance - tolerant of cable-induced transients and ground offsets. |
| ROUT1, ROUT2, ROUT3 | Receiver logic outputs | CMOS-compatible outputs (VOH ≥ VCC–0.6 V, VOL ≤ 0.4 V) - interface directly with UART controllers. |
| ROUT1B | Always-active receiver output | Remains enabled regardless of EN or SHDN state - used for critical status monitoring (e.g., DCD detection). |
| EN | Receiver output enable | High = tri-state all receiver outputs except ROUT1B; low = normal operation - enables bus sharing. |
| SHDN | Global shutdown control | Low = disable all drivers, disable charge pump, reduce ICC to <10 nA - essential for ultra-low-power sleep modes. |
| MBAUD | Data rate mode select | GND = 250 kbit/s (low EMI); VCC = 1 Mbit/s (high throughput) - software-configurable via host GPIO. |
| VCC, V+, V−, GND | Power rails | VCC supplies core logic; V+/V− generated internally for RS-232 signaling - no external ±12-V supplies needed. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual charge pump | Generates ±15-V RS-232 levels from single 3.3-V/5-V supply - eliminates need for external DC/DC converters. |
| Five-driver / three-receiver architecture | Supports full RS-232 port (TX/RX/RTS/CTS/DTR/DSR/CD) with only one IC - reduces BOM count and PCB footprint. |
| Programmable slew rate | 6–150 V/µs range via MBAUD pin - balances signal integrity and EMI reduction across varying cable lengths. |
| Independent EN and SHDN controls | EN disables receiver outputs selectively; SHDN powers down entire IC - enables fine-grained power management. |
| Always-active ROUT1B output | Provides uninterrupted status feedback (e.g., carrier detect) during system sleep - critical for modem wake-up functionality. |
| Industrial temperature grade | –40°C to +85°C operation - validated for use in automotive infotainment, industrial HMIs, and outdoor telemetry units. |
Applications
| Industrial Handheld Terminals | Medical Point-of-Care Devices |
|---|---|
Use Scenario: Ruggedized barcode scanners and asset trackers operating in warehouses with long RS-232 cables and variable ground potentials. IC Role / Device Role / Timing Role: RS-232 physical layer transceiver providing ESD-hardened, slew-rate-controlled serial interface between microcontroller UART and legacy peripherals. Use Value: ±15-kV ESD protection prevents field failures; 1-Mbit/s mode enables fast firmware updates over serial; low 1-mA standby extends battery runtime beyond 72 hours. |
Use Scenario: Portable ECG monitors and infusion pumps requiring certified, low-noise serial communication to PC-based diagnostic software. IC Role / Device Role / Timing Role: Isolated RS-232 interface IC ensuring signal integrity and patient-safety compliance via controlled slew and stable thresholds. Use Value: 0.5-V input hysteresis rejects EMI from nearby RF sources; –40°C to +85°C rating supports sterilization cycles and cold-chain transport. |
| Smart Energy Meters | Factory Automation Gateways |
Use Scenario: DIN-rail mounted electricity meters with optical or RS-232 ports for utility technician configuration and firmware upgrades. IC Role / Device Role / Timing Role: Robust line driver/receiver handling long-distance RS-232 links under high-voltage transients induced by switching loads. Use Value: ±25-V receiver input range tolerates ground loop voltages; latch-up immunity >100 mA per JESD78 Class II ensures reliability in noisy substations. |
Use Scenario: PLC-to-PC gateways converting Modbus RTU over RS-232 to Ethernet, deployed in high-EMI factory floors. IC Role / Device Role / Timing Role: High-integrity serial interface IC managing multiple RS-232 signals (TX/RX/RTS/CTS) with precise timing and low skew. Use Value: Pulse skew <100 ns ensures deterministic timing for hardware flow control; 5-driver capability supports multi-port gateway designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3232ECDWR | 2-driver/2-receiver, SOIC-20, no MBAUD pin, fixed 250 kbit/s max | Limited to basic 3-wire UART; lacks ROUT1B and slew-rate control | Select when cost and footprint are prioritized over multi-channel or high-speed requirements. |
| SP3232EEN-L | 2-driver/2-receiver, SOIC-20, ±15-kV ESD, 250 kbit/s, no shutdown | No SHDN/EN control; no industrial temp grade (0°C to 70°C only) | Choose for commercial-grade consumer devices where ultra-low power and extended temperature are not required. |
Compared with MAX3232ECDWR and SP3232EEN-L, the MAX3237EIDBR offers unique 5-driver/3-receiver density, programmable 1-Mbit/s data rate, always-active ROUT1B, and industrial –40°C to +85°C operation - making it the only option supporting full RS-232 port expansion with advanced power and EMI control in demanding environments.
Availability
MAX3237EIDBR is available at Aetrix Electronics and suitable for industrial handheld terminals, medical point-of-care devices, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX3237EIDBR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in RS-232 interface solutions.
The MAX3237E series was designed specifically for industrial and portable applications needing high-density, ESD-hardened, single-supply RS-232 communication - addressing the demand for reduced external components and extended temperature operation.
FAQ
What is the maximum data rate supported by the MAX3237EIDBR?
The MAX3237EIDBR supports up to 1 Mbit/s when the MBAUD pin is tied to VCC. In default mode (MBAUD = GND), it operates at up to 250 kbit/s. This dual-mode capability allows system designers to optimize for either speed or EMI reduction depending on cable length and noise environment - both modes are fully specified across the –40°C to +85°C temperature range for the MAX3237EIDBR.
Does the MAX3237EIDBR require external charge-pump capacitors?
Yes, the MAX3237EIDBR requires four 0.1-µF external ceramic capacitors (C1+, C1−, C2+, C2−) to operate its internal dual charge pump. These capacitors generate the ±15-V RS-232 compliant output levels from a single 3-V to 5.5-V supply. The MAX3237EIDBR datasheet specifies exact placement and type (non-polarized ceramic preferred), and omitting or mis-sizing them will prevent proper RS-232 voltage generation.
How does the EN pin function on the MAX3237EIDBR?
The EN (Enable) pin on the MAX3237EIDBR places the three main receiver outputs (ROUT1–ROUT3) into high-impedance state when driven high, while ROUT1B remains active regardless of EN state. This allows selective disabling of receiver outputs for bus sharing or power savings without affecting critical always-on functions like carrier detect. The MAX3237EIDBR's EN pin is CMOS-compatible and accepts 3.3-V or 5-V logic levels.
What is the purpose of the ROUT1B pin on the MAX3237EIDBR?
ROUT1B is an always-active receiver output on the MAX3237EIDBR that remains enabled regardless of the states of EN or SHDN. It is typically used for critical status signals such as Data Carrier Detect (DCD), which must remain monitored even during low-power or shutdown modes. This feature ensures reliable wake-up capability in battery-powered applications - a design distinction confirmed in the MAX3237EIDBR functional table and logic diagram.
Is the MAX3237EIDBR pin-compatible with earlier MAX3237 variants?
Yes, the MAX3237EIDBR is pin-compatible with other SSOP-28 variants in the MAX3237E family, including MAX3237ECDBR and MAX3237EIDBRG4.A. All share identical pinout, package dimensions (DB0028A), and electrical behavior - differing only in temperature grade (–40°C to +85°C for MAX3237EIDBR) and packaging markings. This allows drop-in replacement in existing designs without layout changes.
MAX3237EIDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 5/3
- Duplex:
- Full
- Receiver Hysteresis:
- 500 mV
- Data Rate:
- 1Mbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
MAX3237EIDBR FAQ
1.How can I place an order for MAX3237EIDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX3237EIDBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX3237EIDBR reliable?
The price and inventory of MAX3237EIDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX3237EIDBR is usually 5 days.
3.What payment methods are accepted for MAX3237EIDBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX3237EIDBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX3237EIDBR?
MAX3237EIDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX3237EIDBR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX3237EIDBR?
For technical support, including MAX3237EIDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX3237EIDBR requirements.
6.How does Aetrix verify that MAX3237EIDBR is sourced from the original manufacturer or authorized distributors?
All MAX3237EIDBR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX3237EIDBR meets industry standards.
7.What is the process for return or replacement of MAX3237EIDBR?
All MAX3237EIDBR units undergo pre-shipment inspection (PSI). If there is an issue with MAX3237EIDBR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX3237EIDBR part is unused and in its original packaging.
Return procedure for MAX3237EIDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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