MAX232CPE - 5V RS-232 Transceiver, 2 Driver/2 Receiver, 16-PDIP
MPN: MAX232CPE ✓ Hoạt độngMAX232CPE Tóm tắt
An RS-232 transceiver is a line driver/receiver IC that converts between transistor-transistor logic (TTL/CMOS) voltage levels used by microcontrollers and the higher-voltage bipolar signaling levels defined by the EIA/TIA-232 standard. As a member of the line-driver/receiver IC class within Interface ICs, the MAX232 family uses external charge-pump capacitors (typically 1 µF to 10 µF) to double and invert the 5V supply, producing the ±10V swing required by RS-232. This topology removes the legacy dependence on ±12V rails that earlier RS-232 implementations required.
Key features include two RS-232 drivers with ±9V output swing (typical), two RS-232 receivers with TTL/CMOS compatible outputs, an integrated dual charge pump requiring only four external 1 µF capacitors, low supply current of 8 mA typical, and an operating temperature range of 0°C to +70°C (commercial grade). The MAX232CPE differs from the higher-speed MAX232EPE (which extends to 250 kbps) and the wide-temperature MAX232AEPE (which extends to -40°C and adds 15 kV ESD protection on the driver outputs).
The MAX232 family uses a proprietary dual charge-pump architecture that converts +5V into +10V and -10V using only four external capacitors. The drivers meet the EIA/TIA-232E and V.28 specifications with minimum ±5V output swing into 3 kΩ loads, while the receivers accept ±25V inputs and present 5 kΩ input resistance to the line. The MAX232CPE ships in the 16-pin PDIP (PE) through-hole package with pinout identical to the MAX232EPE, MAX232AEPE, SP232ACP-L, and other industry-standard drop-in equivalents.
Typical applications include microcontroller UART-to-RS-232 level translation, industrial point-of-sale (POS) terminals, networking equipment console ports, embedded debug and programming interfaces, and legacy serial peripheral interconnects (modems, instrumentation, barcode scanners). The wide input tolerance of the receivers (±25V) tolerates mis-wiring and noisy RS-232 environments.
When designing with this device, place the four charge-pump capacitors as close as possible to the IC pins and use 1 µF (or larger) ceramic or tantalum types to maintain ±10V output levels. Verify that the data rate does not exceed 120 kbps, as the MAX232CPE is not designed for higher-speed operation; for that, select the MAX232EPE (250 kbps) or MAX232AEPE (200 kbps) variants.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical PCB layout guidance not collated in the original manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MAX232CPE — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX232CPE (cùng hình factor và footprint) — khác nhau ở Data Rate, Operating Temperature, Package, RoHS Status, Supply Voltage.
MAX232CPE+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX232EPE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX232AEPE
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX232N
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SP232ACP-L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADM232A
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX232CPE Thông số kỹ thuật
| Chức năng | RS-232 Transceiver (2 Drivers / 2 Receivers) |
| Protocol | EIA/TIA-232E, V.28/V.24 |
| Điện áp cung cấp | 4.5 V to 5.5 V (single 5 V supply) |
| Tốc độ dữ liệu | 120 kbps |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Driver Output Voltage Swing | ±9 V typical (RS-232 load) |
| Receiver Input Voltage Range | ±25 V |
| Điện áp cung cấp | 8 mA typical |
| Charge Pump Capacitors | 4 x 1 µF external |
| Nhiệt độ hoạt động | 0°C to +70°C (commercial grade) |
| Hộp | 16-pin PDIP (PE) |
| Kiểu lắp đặt | Through-Hole |
| Trạng thái RoHS | See compliance_info |
Cấu hình chân MAX232CPE
| Chân 1 | C1+ — Charge-pump capacitor 1 positive terminal |
| Chân 2 | V+ — Charge-pump +10V output |
| Chân 3 | C1- — Charge-pump capacitor 1 negative terminal |
| Chân 4 | C2+ — Charge-pump capacitor 2 positive terminal |
| Chân 5 | C2- — Charge-pump capacitor 2 negative terminal |
| Chân 6 | V- — Charge-pump -10V output |
| Chân 7 | T2OUT — RS-232 driver 2 output |
| Chân 8 | R2IN — RS-232 receiver 2 input |
| Chân 9 | R2OUT — TTL/CMOS receiver 2 output |
| Chân 10 | T1IN — TTL/CMOS driver 1 input |
| Chân 11 | T1OUT — RS-232 driver 1 output |
| Chân 12 | R1IN — RS-232 receiver 1 input |
| Chân 13 | R1OUT — TTL/CMOS receiver 1 output |
| Chân 14 | GND — Ground |
| Chân 15 | VCC — +5V supply |
| Chân 16 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MAX232CPE phù hợp cho 6 Áp dụngs: Microcontroller UART-to-RS-232 Level Translation, Industrial Point-of-Sale (POS) Terminal Serial Ports, Networking Equipment Console / Management Port, Embedded Debug and Programming Interfaces, Legacy Modem and Instrumentation Interconnect, Automotive Diagnostics (OBD-II) Serial Bridges.
Microcontroller UART-to-RS-232 Level Translation
The MAX232CPE converts the 0V-5V UART (TTL/CMOS) logic levels of a microcontroller to the ±5V minimum-swing RS-232 levels required by a host PC or serial terminal. Two drivers and two receivers handle the standard TX/RX plus RTS/CTS handshaking lines on a DB9 connector. With on-chip charge pumps, no negative supply rail is needed - only a single +5V rail and four 1 µF capacitors. Data rate is achieved via 120 kbps, which exceeds all common baud rates up to 115200.
Được đề xuất
Industrial Point-of-Sale (POS) Terminal Serial Ports
POS terminals, receipt printers, barcode scanners, and cash drawers historically communicate over RS-232 to the host register. The MAX232CPE's ±25V receiver input tolerance survives the ground-potential differences and ESD transients common in retail and warehouse environments. Operating temperature 0°C to +70°C covers the indoor commercial range. The 16-PDIP through-hole package is also easy to hand-rework and replace in field service scenarios.
Được đề xuất
Networking Equipment Console / Management Port
Routers, switches, firewalls, and base stations expose a console (RJ45-to-DB9 serial) port for out-of-band management using RS-232 logic levels. The MAX232CPE accepts the router's UART TX and translates it to ±5V RS-232 for the management workstation. The 16-pin PDIP fits legacy console-board designs; industrial temperature tolerance and ±15 kV ESD may require upgrading to MAX232AEPE for outdoor cabinets or noisy electrical environments.
Được đề xuất
Embedded Debug and Programming Interfaces
Development boards for 8051, AVR, PIC, MSP430, and similar microcontrollers expose an RS-232 serial debug port for bootloaders and in-system programming. The MAX232CPE converts the 3.3V or 5V UART signals to RS-232 levels expected by legacy PC COM ports. The DIP package is breadboard-friendly for prototyping. Many modern designs are migrating to USB, but the MAX232CPE still appears in millions of legacy debug boards and educational kits.
Được đề xuất
Legacy Modem and Instrumentation Interconnect
Industrial instrumentation, laboratory equipment, and legacy modems present RS-232 ports at DB25 or DB9 connectors with ±5V minimum signal swing. The MAX232CPE interfaces these legacy peripherals to a modern microcontroller or single-board computer with a UART. With ±25V tolerant receivers, the IC survives mis-wiring and AC-coupled noise on long cable runs typical of factory-floor installations.
Được đề xuất
Automotive Diagnostics (OBD-II) Serial Bridges
OBD-II scan tools, ECU programmers, and aftermarket vehicle diagnostic interfaces historically used RS-232 to connect to a laptop. The MAX232CPE provides the level translation between the diagnostic MCU's UART and the OBD-II cable, with the receiver's ±25V tolerance absorbing vehicle electrical noise. For under-hood or extreme-temperature automotive environments, upgrade to the industrial-grade MAX232AEPE (-40°C to +85°C).
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX232CPE — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MAX232CPE+ | MAX232EPE | MAX232AEPE | MAX232N | SP232ACP-L | ADM232A |
|---|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | MaxLinear | Analog Devices |
| Package | 16-PDIP (PE) | 16-PDIP (PE) - same | 16-PDIP (PE) - same | 16-PDIP (PE) - same | 16-PDIP - same | 16-PDIP - same | 16-PDIP - same |
| Data Rate | 120 kbps | 120 kbps | 250 kbps | 200 kbps | 120 kbps | 120 kbps | 200 kbps |
| Operating Temperature | 0°C to +70°C | 0°C to +70°C | 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 |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Drivers / Receivers | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 |
| Lead-Free / RoHS | No (lead-free variant is MAX232CPE+) | Yes (RoHS) | No (lead-free variant is MAX232EPE+) | No (lead-free variant is MAX232AEPE+) | No (lead-free variant is MAX232N+) | Yes (RoHS, -L suffix) | Yes (RoHS) |
Bảo phân biệt quan trọng
- Industry-standard 16-PDIP pinout shared with multiple drop-in alternatives (vsSP232ACP-L (MaxLinear))
- Higher data rate available in same package via MAX232EPE (vsMAX232EPE)
- Industrial-grade upgrade path via MAX232AEPE (vsMAX232AEPE)
Ghi chú thiết kế
Place four 1 µF charge-pump capacitors (C1 through C4) as close as possible to the MAX232CPE's C1+, C1-, C2+, C2-, V+, and V- pins. Use ceramic or low-ESR tantalum capacitors; polarized capacitors must be oriented with positive terminals to C1+/C2+. Use short PCB traces (under 5 mm) to minimize parasitic inductance on the charge-pump nodes. Decouple VCC with a 0.1 µF ceramic in parallel with the bulk supply capacitor.
Do not exceed 120 kbps data rate - for higher baud rates use the MAX232EPE (250 kbps) or MAX232AEPE (200 kbps). Do not apply voltage higher than ±25V to receiver inputs. Note that the standard MAX232CPE has a 0°C minimum operating temperature; for cold environments use MAX232AEPE. The MAX232CPE is leaded finish - order MAX232CPE+ (with '+' suffix) for RoHS-compliant end products.
Keep RS-232 trace lengths short and route them away from switching-noise sources such as DC-DC converters, oscillators, and clock lines. Place a 100 nF decoupling capacitor directly on VCC within 3 mm of pin 15. Add a small series ferrite bead or 10 Ω resistor on VCC for additional supply-noise isolation. The exposed through-hole pins of the 16-PDIP package allow easy rework and field replacement.
Thông tin tuân thủ
MAX232CPE is supplied with lead finish (Pb); the RoHS-compliant equivalent is MAX232CPE+ (with '+' suffix). REACH compliance per manufacturer product page. Not AEC-Q100 qualified - not intended for automotive under-hood applications. Use MAX232AEPE for extended temperature or ESD-sensitive designs.
