MAX232ECDR - Dual RS-232 Driver/Receiver, ESD-Protected | TI
Référence : MAX232ECDR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.62 | $1,62 |
| 10 | $1.42 | $14,20 |
| 100 | $1.18 | $118,00 |
| 500 | $0.96 | $480,00 |
| 1 000 | $0.82 | $820,00 |
MAX232ECDR Présentation
What is an RS-232 transceiver? An RS-232 transceiver is a type of serial interface IC that translates logic-level (0 V/5 V or 0 V/3.3 V) signals on the TTL/CMOS side to bipolar RS-232 voltage levels (typically ±5 V to ±15 V) required by the TIA/EIA-232-F standard. RS-232 transceivers sit inside the interface ICs family, between UART/SCI controllers and external DB9/DB25 connectors, enabling legacy PC and industrial serial communication. The MAX232 family historically integrated charge-pump doublers/inverters to generate ±10 V from a single +5 V rail, eliminating the need for a dual supply.
Key features of the MAX232ECDR include on-chip ±10 V generation from a single 5 V supply via four external 1.0 µF charge-pump capacitors, ±30 V receiver input tolerance that exceeds the TIA/RS-232-F specification, low supply current (typically 8 mA), and TTL/CMOS-compatible logic I/O. The integrated IEC 61000-4-2 ESD protection on the RS-232 lines eliminates external TVS arrays in most designs, reducing BOM cost and PCB area. The device operates across the commercial 0 °C to 70 °C temperature range.
The MAX232ECDR uses a CMOS charge-pump voltage doubler/inverter architecture: an internal oscillator drives an external capacitor network that produces V+ (≈ +10 V) and V− (≈ −10 V) rails from the +5 V supply. Drivers translate TTL inputs to RS-232 levels (5 V → +10 V for a mark, 0 V → −10 V for a space); receivers invert and level-shift incoming RS-232 signals back to TTL. The 120 kbit/s data rate supports standard serial links including legacy modems, point-of-sale terminals, and industrial PLC links.
Typical applications include factory automation PLCs and industrial control RS-232 ports, point-of-sale (POS) terminals, legacy PC COM ports and peripherals (mice, barcode scanners), embedded microcontroller UART bridges, and instrumentation serial links. The integrated ESD protection makes it especially suitable for handheld and field-exposed equipment where IEC 61000-4-2 air-discharge events are routine.
When designing with this part, place the four 1.0 µF charge-pump capacitors as close as possible to the C1+, C1−, C2+, C2− pins to minimize ripple and EMI. Note that VCC must rise monotonically and quickly to ensure proper charge-pump startup; an RC delay on VCC is not recommended. Receiver inputs tolerate ±30 V even when VCC = 0 V (true fail-safe), simplifying hot-plug and powered-down interfaces.
This page synthesizes distributor stock and pricing, drop-in same-package alternatives, IEC 61000-4-2 design guidance, and comparator pinout notes not consolidated on the manufacturer datasheet front page.
Alternatives de remplacement direct pour MAX232ECDR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MAX232ECDR (même facteur de forme et même empreinte) — différant par Function, RS-232 Output Voltage Swing.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX232EIDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232ECDRG4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232ECD
✅ Remplacement direct✓ En stock
$0.65 / unité
Voir la fiche technique →MAX3232ECDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SP232EEN-L
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232ECDR Spécifications
| Fonction | Dual RS-232 Driver/Receiver |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Débit de données | 120 kbit/s |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Courant d'alimentation | 8 mA (typ) |
| Receiver Input Voltage Range | ±30 V |
| RS-232 Output Voltage Swing | ±5 V min, ±10 V typ (from charge pump) |
| ESD Protection (HBM) | ±15 kV (per datasheet) |
| ESD Protection (IEC 61000-4-2) | Contact ±8 kV, Air ±15 kV |
| Charge-Pump Capacitors | 4 x 1.0 µF external |
| Plage de température de fonctionnement | 0 °C to 70 °C (commercial) |
| Boîtier | 16-pin SOIC (D) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Standards Compliance | TIA/EIA-232-F, ITU-T V.28 |
Configuration des broches de MAX232ECDR
| Broche 1 | C1+ — Charge-pump flying capacitor 1 positive terminal |
| Broche 2 | V+ — Charge-pump generated +10 V supply (driver VCC) |
| Broche 3 | C1- — Charge-pump flying capacitor 1 negative terminal |
| Broche 4 | C2+ — Charge-pump flying capacitor 2 positive terminal |
| Broche 5 | C2- — Charge-pump flying capacitor 2 negative terminal |
| Broche 6 | V- — Charge-pump generated -10 V supply (driver VEE) |
| Broche 7 | T2OUT — RS-232 driver 2 output (to DB-9) |
| Broche 8 | R2IN — RS-232 receiver 2 input (from DB-9) |
| Broche 9 | R2OUT — TTL/CMOS receiver 2 output (to UART) |
| Broche 10 | T2IN — TTL/CMOS driver 2 input (from UART) |
| Broche 11 | T1IN — TTL/CMOS driver 1 input (from UART) |
| Broche 12 | R1OUT — TTL/CMOS receiver 1 output (to UART) |
| Broche 13 | R1IN — RS-232 receiver 1 input (from DB-9) |
| Broche 14 | T1OUT — RS-232 driver 1 output (to DB-9) |
| Broche 15 | GND — Ground |
| Broche 16 | VCC — +5 V supply input |
Applications typiques
MAX232ECDR convient pour 6 applications: Industrial PLC RS-232 Communication Ports, Point-of-Sale (POS) Terminal Serial Ports, Legacy PC COM Port / Peripheral Interface, Embedded Microcontroller UART-to-RS-232 Bridge, Industrial Instrumentation & Test Equipment Serial Links, Consumer Electronics Service / Debug Ports.
Industrial PLC RS-232 Communication Ports
The MAX232ECDR fits industrial PLC RS-232 ports because it integrates IEC 61000-4-2 ±8 kV contact / ±15 kV air ESD protection on the RS-232 pins, eliminating external TVS arrays in factory environments where air-discharge events are routine. Operating from a single 5 V rail with 1.0 µF charge-pump caps and supporting 120 kbit/s, it bridges the PLC's TTL UART to legacy HMI panels, motor drives, and bar-code scanners. The ±30 V receiver input tolerance handles mis-wired field cabling without latching. Compared to a discrete op-amp + TVS design, the MAX232ECDR cuts BOM cost roughly 40% and shrinks PCB area while meeting IEC 61000-4-2 levels common to EN 61131-2 industrial control equipment.
Recommandé
Point-of-Sale (POS) Terminal Serial Ports
POS terminals need robust RS-232 ports for cash drawers, receipt printers, and PIN pads, where cables are repeatedly plugged by staff and exposed to static discharge. The MAX232ECDR's ±15 kV IEC 61000-4-2 air-discharge rating protects against routine customer handling, while its 120 kbit/s speed covers all standard peripheral baud rates. With only four 1.0 µF caps needed and no external charge-pump circuitry, the BOM stays lean for cost-sensitive POS designs. The 16-pin SOIC footprint is drop-in compatible with the MAX232 family for legacy firmware upgrade paths.
Recommandé
Legacy PC COM Port / Peripheral Interface
The MAX232ECDR was designed for legacy PC DB-9 COM ports connecting peripherals like serial mice, barcode scanners, and GPS receivers. With ±30 V receiver input tolerance exceeding the TIA/EIA-232-F specification, it survives line transients on hot-plug events. The single 5 V supply matches the PC mainboard 5 VSB rail, and 120 kbit/s data rate supports 115.2 kbaud standard COM-port operation. Integrated ESD protection (HBM ±15 kV) eliminates the need for external TVS diodes on the DB-9 connector footprint, simplifying motherboard design and reducing component count by ~30% versus discrete designs.
Recommandé
Embedded Microcontroller UART-to-RS-232 Bridge
Most 5 V microcontrollers (8051, PIC16, ATmega, MSP430 with 5 V I/O) lack native RS-232 levels, requiring an external transceiver. The MAX232ECDR is the industry standard bridge: connect the MCU's UART TX/RX pins to T1IN/R1OUT, and the DB-9 TXD/RXD lines to T1OUT/R1IN. With 120 kbit/s throughput it handles all standard baud rates up to 115.2 k. The single 5 V supply matches the MCU rail and the IEC 61000-4-2 ESD rating protects against bench-test mishaps. Designers can swap directly to the MAX3232ECDR if migrating to a 3.3 V MCU without PCB changes.
Recommandé
Industrial Instrumentation & Test Equipment Serial Links
Bench instruments like digital multimeters, oscilloscopes, and spectrum analyzers traditionally offer RS-232 for SCPI command interfaces. The MAX232ECDR's ±15 kV HBM and IEC 61000-4-2 ESD protection on the rear-panel DB-9 port prevents field failures from operator-induced discharge. The ±30 V receiver tolerance handles ground-loop transients common in lab setups, and the 120 kbit/s rate covers SCPI over RS-232. The 0 °C to 70 °C commercial temperature range suits controlled-lab environments; for outdoor test gear choose the MAX232EIDR industrial variant.
Recommandé
Consumer Electronics Service / Debug Ports
Many consumer electronics (set-top boxes, A/V receivers, smart-home hubs) expose RS-232 debug ports for factory programming and field service. The MAX232ECDR provides a small-footprint single-chip solution: 5 V from the main supply, four 1.0 µF caps, and a 16-pin SOIC that fits behind the rear panel. The integrated IEC 61000-4-2 ESD rating protects against technician mishandling during service. With 120 kbit/s bandwidth, it accommodates all common firmware-update baud rates. Compared to building the charge pump from discretes, the integrated solution cuts PCB area by ~50% and BOM cost by ~60%.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX232ECDR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX232EIDR | MAX232ECDRG4 | MAX232ECD | MAX3232ECDR | SP232EEN-L |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | MaxLinear |
| Package | SOIC-16 | SOIC-16 (same) | SOIC-16 (same) | SOIC-16 (same) | SOIC-16 (same) | SOIC-16 (same) |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 3.0 V to 5.5 V | 4.5 V to 5.5 V |
| Data Rate | 120 kbit/s | 120 kbit/s | 120 kbit/s | 120 kbit/s | 250 kbit/s | 120 kbit/s |
| IEC 61000-4-2 ESD | ±8 kV contact, ±15 kV air | ±8 kV contact, ±15 kV air | ±8 kV contact, ±15 kV air | ±8 kV contact, ±15 kV air | ±8 kV contact, ±15 kV air | ±15 kV HBM (IEC rating not specified) |
| Operating Temperature | 0 °C to 70 °C | -40 °C to 85 °C | 0 °C to 70 °C | 0 °C to 70 °C | 0 °C to 70 °C | 0 °C to 70 °C |
| Charge-Pump Capacitors | 4 x 1.0 µF | 4 x 1.0 µF | 4 x 1.0 µF | 4 x 1.0 µF | 4 x 0.1 µF | 4 x 1.0 µF |
| Lifecycle Status | Active | Active | Active | Active | Active | Active |
Principaux différenciateurs
- Integrated IEC 61000-4-2 ESD protection on RS-232 pins (vs MAX232CDR (non-E))
- Wide supply voltage range with 3.3 V to 5 V compatibility (vs MAX232ECDR vs MAX3232ECDR)
- Cross-brand second-source availability from MaxLinear (vs SP232EEN-L (MaxLinear))
Notes de conception
Place the four charge-pump capacitors (C1, C2, C3, C4) within 5 mm of the C1+, C1−, C2+, C2− pins and use a wide ground pour under the SOIC to minimize charge-pump ripple. According to TI layout guidelines, lead inductance above ~20 nH per capacitor leg degrades the ±10 V rail regulation and increases EMI. Keep the VCC decoupling capacitor (0.1 µF) within 3 mm of pin 16. Use a ground island around the charge-pump area to prevent switching noise coupling into the receiver sections.
Do not exceed 5.5 V on VCC; the absolute-maximum is 6 V and overvoltage will damage the charge-pump oscillator. Do not omit the four 1.0 µF capacitors - the charge pump cannot generate ±10 V without them. VCC must rise monotonically from 0 V to 4.5 V within 1 ms to ensure proper charge-pump startup; if your upstream rail ramps slowly, add a power-on-reset supervisor or pull-up to keep drivers in high-Z. Receiver inputs are ±30 V tolerant but the drivers' T1OUT/T2OUT pins must NEVER be driven externally above ±15 V or absolute damage will occur.
The MAX232ECDR's internal charge-pump oscillator operates around 250 kHz to 400 kHz and is a common source of EMI near sensitive analog circuits. To minimize radiated emissions: (1) place the four charge-pump capacitors on the same PCB layer with short traces; (2) use a ground guard ring around the charge-pump section; (3) add a 10 µF tantalum bypass on VCC if long cables share the supply; (4) keep T1OUT/T2OUT traces short and routed away from receiver inputs. According to TI, the IC's integrated charge-pump typically produces ~20 mVpp ripple on V+ and V−, which is well below the 5 V receiver threshold hysteresis.
Informations de conformité
RoHS and REACH compliant per TI product page; the MAX232ECDR is not AEC-Q100 qualified (it is a commercial-grade part). For automotive RS-232 applications choose MAX3232EIDR-Q1 or equivalent.
