MC1489NE4 - Quad RS-232 Line Receiver, 5V | Texas Instruments
MPN: MC1489NE4 ✓ Hoạt độngMC1489NE4 Tóm tắt
A line receiver is an interface IC that converts large-swing serial-communication voltage levels (up to ±30 V in RS-232 systems) into safe TTL/CMOS logic levels for a microcontroller or UART. Within the signal-chain hierarchy, the MC1489NE4 belongs to the line receiver family of interface ICs, sitting between the physical RS-232 cable and the digital logic of a serial port, complementing a line driver such as the MC1488 or SN75188 on the transmit side.
Key features include an input signal range of ±30 V, an input resistance of 3.0 kOhm to 7.0 kOhm, and a separate response-control (CONT) terminal for each receiver, per the Texas Instruments datasheet. The response-control pin lets a designer add an external resistor, or a resistor plus bias voltage, to shape input thresholds and noise immunity - a flexibility point that distinguishes the MC1489 family from fixed-threshold receivers.
Technically, the device is fabricated as a low-power Schottky bipolar monolithic circuit. Each receiver senses a differential-mode-comparable single-ended RS-232 input and produces a logic-level output with defined high and low thresholds. Power dissipation ratings in the datasheet list 950 mW at 25 C for the D package and 1150 mW for the N package, with derating factors above 25 C, and a commercial temperature grade up to 70 C as listed by distributors for the MC1489NE4 suffix.
Typical applications include legacy RS-232 serial ports on industrial equipment, programmable logic controller (PLC) communication cards, point-of-sale terminals, modem interfaces, and instrumentation front ends that must still accept ±12 V or ±15 V signaling from older field devices.
A key design consideration is threshold shaping via the CONT pins: adding a positive bias raises the input threshold and improves noise immunity in electrically harsh environments, while leaving the pin open restores the default response. Also verify the 5 V rail tolerance, since the device is specified for a nominal VCC of 5 V with a distributor-listed maximum around 5.5 V.
This page adds value beyond the raw datasheet: it synthesizes drop-in alternative comparisons (SN75189AN, MC1489P), application guidance, and design notes for engineers maintaining RS-232 legacy systems.
Bộ thay thế dễ dàng lắp đặt cho MC1489NE4 — 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 MC1489NE4 (cùng hình factor và footprint) — khác nhau ở Input Signal Range, Package, Input Resistance, Interface Standard, Input Hysteresis.
SN75189AN
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN75189N
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC1489P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SN75189N
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC1489N
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC1489NE4 Thông số kỹ thuật
| Chức năng | Quadruple RS-232 line receiver |
| Number of Receivers | 4 |
| Protocol | EIA/TIA-232-F (RS-232) |
| Supply Voltage (nominal) | 5 V |
| Supply Voltage (max, distributor-listed) | 5.5 V |
| Input Signal Range | ±30 V |
| Input Resistance | 3.0 kOhm to 7.0 kOhm |
| Receive Delay (typ, distributor-listed) | 85 ns |
| Response Control | Separate CONT terminal per receiver |
| Kiểu đầu ra | TTL/CMOS-compatible logic level |
| Technology | Monolithic low-power Schottky bipolar |
| Hộp | 14-PDIP (N) |
| Kiểu lắp đặt | Through-Hole |
| Nhiệt độ hoạt động | 0C to +70C (commercial grade, distributor-listed) |
| Power Dissipation (N package, TA=25C) | 1150 mW (datasheet dissipation table) |
| Trạng thái RoHS | Compliant (distributor-listed) |
Cấu hình chân MC1489NE4
| Chân 1 | 1A — Receiver 1 RS-232 input |
| Chân 2 | 1Y — Receiver 1 TTL-level output |
| Chân 3 | 1 CONT — Receiver 1 response-control (threshold adjust) |
| Chân 4 | 2 CONT — Receiver 2 response-control (threshold adjust) |
| Chân 5 | 2Y — Receiver 2 TTL-level output |
| Chân 6 | 2A — Receiver 2 RS-232 input |
| Chân 7 | GND — Ground |
| Chân 8 | 3A — Receiver 3 RS-232 input |
| Chân 9 | 3Y — Receiver 3 TTL-level output |
| Chân 10 | 3 CONT — Receiver 3 response-control (threshold adjust) |
| Chân 11 | 4 CONT — Receiver 4 response-control (threshold adjust) |
| Chân 12 | 4Y — Receiver 4 TTL-level output |
| Chân 13 | 4A — Receiver 4 RS-232 input |
| Chân 14 | VCC — 5 V power supply |
Ứng dụng tiêu biểu
MC1489NE4 phù hợp cho 6 Áp dụngs: Legacy RS-232 Serial Ports, Industrial PLC Communication Cards, Modem and DCE Interfaces, Point-of-Sale Terminals, Instrumentation Front Ends, Building Automation and Security Panels.
Legacy RS-232 Serial Ports
The MC1489NE4 is the classic receive-side device for PC and equipment serial ports compliant with EIA/TIA-232-F. Its ±30 V input range absorbs signaling from ±5 V to ±15 V drivers of any vintage, and the 3.0-7.0 kOhm input resistance matches the RS-232 load specification, so it terminates the cable correctly. Each receiver output drives a standard 5 V UART RXD input directly. In maintenance and repair of industrial PCs, CNC controllers, and test benches that still use DE-9 or DB-25 serial links, this through-hole 14-PDIP receiver drops straight into existing sockets, avoiding board redesign while restoring full compliance with the original port electrical specification.
Được đề xuất
Industrial PLC Communication Cards
Programmable logic controller serial modules frequently retain RS-232 programming and SCADA ports. The MC1489NE4 fits these cards because its commercial 0 C to +70 C grade covers typical control-cabinet ambient conditions, and its bipolar input structure tolerates the ground-potential offsets common between cabinets. The per-receiver response-control (CONT) pin lets designers raise the input threshold with a resistor-bias network, improving noise immunity on the long shielded cables running to operator interfaces. With approximately 85 ns receive delay, the device adds negligible latency to 115.2 kbps and slower programming links, and the 14-PDIP through-hole package survives the vibration and rework cycles typical of industrial card maintenance.
Được đề xuất
Modem and DCE Interfaces
As the receive half of a DTE/DCE interface, the MC1489NE4 converts RxD, DSR, DCD, and CTS signals from a modem or datacommunications device into logic levels, one receiver per handshake line - exactly the four channels the package provides. According to the TI datasheet, the device was designed specifically for the interface between data terminal equipment and data communications equipment under EIA/TIA-232-F. Paired with a driver such as the MC1488 or SN75188 on the transmit side, it completes a standards-compliant port. The ±30 V tolerance protects the receiver when modems of different eras and drive levels are connected, and the 5 V-only supply suits legacy modem-card power architectures.
Được đề xuất
Point-of-Sale Terminals
Retail point-of-sale equipment - receipt printers, barcode scanners, cash-drawer controllers - commonly exposes RS-232 ports, and the MC1489NE4 receives these signals at TTL levels for the terminal MCU. Its wide ±30 V input range accommodates the varied drive levels found across printer vendors, eliminating damage risk during peripheral substitution. The 3-7 kOhm input resistance satisfies the RS-232 loading requirement so multiple handshake lines can share one package. In commercial kitchen and warehouse environments with electrically noisy equipment, applying a positive bias on the CONT pins per the TI datasheet raises switching thresholds and suppresses false start-bit detection, improving link reliability without changing the PCB footprint.
Được đề xuất
Instrumentation Front Ends
Bench instruments, data loggers, and older lab equipment expose RS-232 for remote control (SCPI-style command links). The MC1489NE4 receives command data with roughly 85 ns propagation delay, which is negligible even at the 19.2-115.2 kbps rates typical of instrument ports. Its bipolar construction provides hard, well-defined switching thresholds that reject slow-moving noise better than many CMOS receivers, an advantage on the long unshielded cables used in labs. Because the device is specified to EIA/TIA-232-F, instruments built with it interoperate with any conforming controller. The through-hole package also simplifies single-unit repair of legacy instruments where SMD rework is impractical.
Được đề xuất
Building Automation and Security Panels
Access-control panels, alarm dialers, and HVAC controllers still communicate over RS-232 to modems, printers, and commissioning laptops. The MC1489NE4's ±30 V tolerance survives the transient surges that long building cable runs pick up from lighting and elevator machinery, and the 5 V single-supply operation matches the panel's logic rail without extra supplies. Applying threshold bias on the CONT inputs (per the TI datasheet response-control guidance) hardens each receiver against the ground noise typical of multi-building installations. The 0 C to +70 C commercial grade fits indoor control-room conditions, and four receivers per package cover RxD plus three handshake lines in a single through-hole footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC1489NE4 — 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 | SN75189AN | MC1489P | MC1489N |
|---|---|---|---|---|
| Package | 14-PDIP (N) | 14-PDIP - same | 14-PDIP - same | 14-PDIP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Number of Receivers | 4 | 4 | 4 | 4 |
| Protocol | EIA/TIA-232-F | A/EIA-232-F | EIA/TIA-232-F | EIA-232D |
| Input Signal Range | ±30 V | ±30 V | ±30 V | ±30 V |
| Response Control per Receiver | Yes (CONT pin each) | Yes (CONT pin each) | Yes (CONT pin each) | Yes (CONT pin each) |
| Supply Voltage | 5 V nominal | 5 V nominal | 5 V nominal | 5 V nominal |
| Mounting | Through-Hole | Through-Hole | Through-Hole | Through-Hole |
Bảo phân biệt quan trọng
- Industry-standard MC1489 die family with NE4 commercial suffix (vsSN75189AN)
- Full EIA/TIA-232-F compliance with per-receiver threshold shaping (vsMC1489N (onsemi))
- ±30 V input tolerance on all four receivers (vsSN75189AN)
Ghi chú thiết kế
Place a 0.1 uF ceramic decoupling capacitor directly between pin 14 (VCC) and pin 7 (GND), keeping traces under 10 mm. Because RS-232 inputs carry large voltage swings, route the A-input traces away from the Y-output traces to prevent coupling of unterminated-cable transients into logic outputs. Keep the CONT traces short; if a threshold-bias network is used, return its ground at the device ground pin to avoid ground-bounce offsetting the thresholds. The through-hole PDIP allows easy socketing - recommended for field-serviceable equipment.
Do not connect receiver inputs to RS-485 or RS-422 differential pairs - this is a single-ended RS-232 receiver only. Never exceed the ±30 V absolute input range; extended surges beyond this require external TVS protection on the line. Do not operate below 4.75 V or above 5.5 V on VCC; thresholds are only guaranteed inside the specified supply range. If CONT pins are unused, leave them open per the datasheet default - tying them to VCC or ground without a series resistor changes the switching thresholds unpredictably.
Estimated: the MC1489NE4 is a receiver-only device, so dissipation is dominated by quiescent current rather than line current. With typical receiver quiescent levels (milliamp range on a 5 V rail), dissipation stays far below the datasheet N-package rating of 1150 mW at TA = 25 C, and no heatsinking or thermal copper pour is required. Apply the datasheet derating factor of 9.2 mW per degree C above 25 C only if driving unusually heavy DC loads on the outputs; for standard UART RXD inputs this derating is irrelevant.
Thông tin tuân thủ
RoHS status listed as compliant on distributor product pages (PCB Electronics listing). REACH, lead-free and halogen-free status not stated in the retrieved listings.
