MAX3222CPN+ - 3V RS-232 Transceiver, 1Mbps, 18-PDIP | Maxim
部品番号: MAX3222CPN+ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $5.32 | $5.32 |
| 10 | $4.78 | $47.80 |
| 100 | $4.25 | $425.00 |
| 500 | $3.92 | $1,960.00 |
| 1,000 | $3.87 | $3,870.00 |
MAX3222CPN+ 概要
A True RS-232 transceiver is a line driver/receiver IC that translates logic-level UART signals (0/VCC) to RS-232 voltage levels (±5V to ±15V) while also shifting external RS-232 levels back down to logic levels. It is a core sub-category of the serial-communication interface hierarchy: UART -> RS-232 transceiver -> line driver/receiver -> interface IC -> integrated circuit. The internal charge-pump voltage doubler/inverter eliminates the bulky ±12V supplies required by legacy RS-232 designs.
Key features include an enhanced ESD protection of ±15 kV HBM on the RS-232 bus pins (driver outputs and receiver inputs), guaranteed 120 kbps data rate, and a low 1 uA supply current in shutdown. The MAX3222 is pin-, package-, and functionally compatible with the industry-standard MAX242, providing a low-power modern replacement for legacy designs.
The MAX3222 architecture uses an internal dual charge pump (with external 0.1 uF flying and reservoir capacitors) to generate the +5.5V and -5.5V rails required by the RS-232 standard. It includes five receivers/drivers in companion parts (MAX3237 has 3 Rx / 5 Tx, MAX3241 has 5 Rx / 3 Tx) so designers can match port count to application without changing footprint.
Typical applications include industrial point-of-sale terminals, networking equipment serial ports, embedded UART-to-RS-232 bridges, and legacy PC peripherals where a through-hole DIP form factor is preferred for hand-prototyping or repair. The wide 3.0V-5.5V supply range lets the same part work from a 3.3V MCU rail or a 5V logic rail.
When designing with this device, place the four 0.1 uF charge-pump capacitors as close to the IC pins as possible to minimize supply ripple and meet RS-232 voltage levels under full load. For battery-powered designs, take advantage of the SHDN pin (active-low) to drop quiescent current to 1 uA between transmissions.
ドロップイン代替品: MAX3222CPN+ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
MAX3222EPN+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX3232CPN+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ST3222CPN+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX3222CPN+ 仕様
| 機能 | Transceiver |
| Protocol | RS-232 |
| Number of Drivers/Receivers | 2/2 |
| Duplex | Full |
| データレート | 120 kbps (guaranteed); up to 1 Mbps (family) |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| RS-232 Driver Output Voltage | ±5.0 V minimum at 3.3 V supply |
| Receiver Input Voltage Range | ±25 V |
| ESD Protection (RS-232 pins) | ±15 kV HBM |
| Supply Current (no load) | 1 mA typical |
| Shutdown Supply Current | 1 uA typical |
| External Capacitors | 4 x 0.1 uF |
| 動作温度 | 0 C to +70 C (commercial) |
| パッケージ | 18-pin PDIP (N) |
| 実装タイプ | Through-Hole |
| MSLレベル | 1 (unlimited) |
| RoHS ステータス | Compliant |
MAX3222CPN+ ピン構成
| ピン 1 | C1+ — Charge-pump flying capacitor 1, positive terminal |
| ピン 2 | V+ — Charge-pump generated +5.5 V output |
| ピン 3 | C1- — Charge-pump flying capacitor 1, negative terminal |
| ピン 4 | C2+ — Charge-pump flying capacitor 2, positive terminal |
| ピン 5 | C2- — Charge-pump flying capacitor 2, negative terminal |
| ピン 6 | V- — Charge-pump generated -5.5 V output |
| ピン 7 | T1OUT — RS-232 driver 1 output |
| ピン 8 | T2OUT — RS-232 driver 2 output |
| ピン 9 | R1IN — RS-232 receiver 1 input |
| ピン 10 | R2IN — RS-232 receiver 2 input |
| ピン 11 | GND — Ground |
| ピン 12 | VCC — Supply voltage (3.0 V to 5.5 V) |
| ピン 13 | R1OUT — TTL/CMOS receiver 1 output |
| ピン 14 | R2OUT — TTL/CMOS receiver 2 output |
| ピン 15 | T1IN — TTL/CMOS driver 1 input |
| ピン 16 | T2IN — TTL/CMOS driver 2 input |
| ピン 17 | INVALID — Valid signal indicator output (active-low) |
| ピン 18 | SHDN — Shutdown control input (active-low) |
主な用途
MAX3222CPN+ の用途: 6 件s: Industrial Point-of-Sale (POS) Terminals, Embedded UART-to-RS-232 Bridge Modules, Networking Equipment Serial Console Ports, Legacy PC Peripheral Adapters, Battery-Powered Handheld Test & Measurement, Modbus RTU / DMX512 Communication Interfaces.
Industrial Point-of-Sale (POS) Terminals
The MAX3222CPN+ is well suited for POS terminals that must communicate with legacy serial peripherals (barcode scanners, receipt printers, cash drawers) over RS-232. Its 3.0 V to 5.5 V supply range lets the same IC work from a 3.3 V MCU rail or a 5 V logic rail, while the four external 0.1 uF charge-pump capacitors minimize BOM cost versus designs requiring ±12 V supplies. The ±15 kV HBM ESD protection on the RS-232 bus pins reduces the need for external TVS arrays, which is critical for retail equipment that experiences frequent cable insertion events. Pair it with a Cortex-M0 host MCU running FreeRTOS, and use the SHDN pin to enter 1 uA quiescent between transactions.
おすすめ
Embedded UART-to-RS-232 Bridge Modules
Embedded boards that expose a 3.3 V UART header (Raspberry Pi, STM32 Nucleo, ESP32 dev kits) commonly need an RS-232 level shifter to talk to industrial equipment, PLCs, and lab instruments. The MAX3222CPN+ provides a self-contained 2-driver / 2-receiver bridge in a through-hole 18-PDIP that breadboard-friendly designs can hand-solder. The 1 Mbps maximum data rate (120 kbps guaranteed) covers Modbus RTU, DMX512, and most legacy serial protocols. Designers typically pair it with a DB9 connector and four 0.1 uF ceramic caps placed within 5 mm of the IC pins to keep charge-pump ripple under the RS-232 spec.
おすすめ
Networking Equipment Serial Console Ports
Routers, switches, and base stations require an out-of-band serial console port that survives AC power-line surges, hot-plug events, and field-service handling. The MAX3222CPN+'s ±15 kV HBM ESD on the RJ45/DB9 connector pins provides margin against field-failure modes, while its 1 uA shutdown current lets the system cut power to unused console ports in low-power standby. The MAX3222/MAX3232 family is pin-compatible with the older MAX242, allowing modern RoHS-compliant refreshes of legacy networking designs. Designers commonly place the four 0.1 uF capacitors on the top side adjacent to the IC for reworkability.
おすすめ
Legacy PC Peripheral Adapters
Field repairs of industrial PCs, CNC controllers, and medical instruments often require an RS-232 transceiver in a through-hole DIP for compatibility with hand-rework and existing through-hole PCB designs. The MAX3222CPN+'s 18-PDIP footprint matches the legacy MAX232 and MAX242, allowing drop-in upgrades that reduce operating voltage from 5 V-only to a flexible 3.0 V to 5.5 V range while eliminating ±12 V supplies. The ±15 kV ESD protection reduces warranty returns from ESD-damaged ports. Designers should retain the four 0.1 uF capacitors close to the charge-pump pins to ensure RS-232-compliant ±5 V driver outputs across the full 3.0 V to 5.5 V supply range.
おすすめ
Battery-Powered Handheld Test & Measurement
Handheld multimeters, oscilloscope probes, and field-service tools that need an RS-232 diagnostic port benefit from the MAX3222CPN+'s 1 uA shutdown current and 3.0 V to 5.5 V operation from a single Li-ion cell. The active-low SHDN pin allows the MCU to gate the transceiver off entirely between diagnostic sessions, extending battery life by months in standby. The 18-PDIP through-hole package is easier to hand-solder than QFN alternatives, which speeds field repair. The ±15 kV HBM ESD protection is a key differentiator for instruments that connect to unknown grounded equipment in the field.
おすすめ
Modbus RTU / DMX512 Communication Interfaces
Industrial Modbus RTU networks (commonly running at 9600 to 115200 baud) and DMX512 lighting-control buses both use RS-232/RS-485 physical layers, where the MAX3222CPN+ serves as a low-cost transceiver on the RS-232 segment. The 120 kbps guaranteed data rate comfortably exceeds the 115200 baud Modbus ceiling with margin for protocol overhead. The four 0.1 uF charge-pump caps produce ±5.5 V from a single 3.3 V rail, removing the need for isolated ±12 V supplies in space-constrained lighting fixtures and PLC modules. Pair with TVS protection (e.g. SMBJ series) on the bus side for surge immunity.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX3222CPN+ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX3222EPN+ | MAX3232CPN+ | ST3222CPN+ |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | STMicroelectronics |
| Package | 18-PDIP | 18-PDIP (same) | 18-PDIP (same) | 18-PDIP (same) |
| Drivers / Receivers | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 |
| Data Rate (max) | 1 Mbps | 1 Mbps | 120 kbps | 250 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 |
| External Capacitors | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF |
| ESD Protection (HBM) | ±15 kV | ±15 kV | ±15 kV | ±15 kV |
| Operating Temperature | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | 0 C to +70 C |
| Shutdown Current | 1 uA | 1 uA | 1 uA | 1 uA |
主な差別化要因
- Industry-leading ±15 kV HBM ESD protection on RS-232 pins （vs MAX3232CPN+)
- Up to 1 Mbps data rate capability within the family （vs MAX3232CPN+)
- Established second-source ecosystem across two vendors （vs ST3222CPN+)
設計ノート
Place all four 0.1 uF charge-pump capacitors (C1, C2 flying; V+ and V- reservoir) within 5 mm of their respective IC pins to minimize supply ripple and ensure the RS-232 driver outputs meet the ±5 V minimum spec under full load. Use X7R or X5R ceramic dielectrics; avoid Y5V which loses 70% capacitance at 5 V bias. Keep capacitor ground returns short and connect them to the IC GND pin (pin 11) via a wide trace or via farm to prevent ground bounce during high-speed transitions.
Do not omit the SHDN (pin 18) tie-off - if left floating it may drift high or low and cause unexpected shutdown behavior. Tie SHDN high (to VCC) through a 100 kohm pull-up for always-on operation, or drive it directly from a GPIO for shutdown control. Also note that the INVALID output (pin 17) requires a pull-up resistor (typically 100 kohm to VCC) if you monitor it, since it is an open-drain output per the datasheet.
Keep the RS-232 bus traces (T1OUT, T2OUT, R1IN, R2IN) routed away from clock and high-speed digital signals to minimize crosstalk. The through-hole 18-PDIP package is forgiving for two-layer boards, but if you convert to SOIC or SSOP variants, place the charge-pump capacitors on the same layer as the IC and avoid via transitions on the capacitor return paths. For ±15 kV ESD margin, consider adding a SMBJ6.0CA TVS array at the DB9 connector as defense-in-depth.
コンプライアンス情報
RoHS and lead-free per the "+" suffix in the MPN; commercial temperature grade 0C to +70C; choose MAX3222EPN+ for industrial temperature. AEC-Q100 not applicable (industrial/consumer interface IC).
