MC1488N - Quadruple RS-232 Line Driver | Texas Instruments
MPN： MC1488N ✓ 啟用中MC1488N 概覽
A line driver is a digital interface circuit that converts low-voltage logic signals into RS-232-compatible voltage levels. The MC1488 belongs to the RS-232 driver hierarchy, where a line driver interfaces data-terminal equipment with data-communications equipment. Its four channels allow one package to support four unidirectional serial data paths, reducing component count in multi-port or multi-channel RS-232 equipment.
The device is designed to meet or exceed ANSI EIA/TIA-232-E and ITU Recommendation V.28 requirements. According to the Texas Instruments manufacturer datasheet, each output includes current limiting, and the power-off output impedance is at least 300 ohms. A series diode is used at each supply-voltage terminal, while the output slew rate can be controlled through the load capacitance connected to each driver.
The MC1488N is designed to be interchangeable with the Motorola MC1488, which supports PCB sourcing flexibility where the original function is required. The manufacturer datasheet identifies the MC1488, SN55188, and SN75188 as monolithic quadruple line drivers, but device ordering suffixes, temperature ranges, and package variants must still be checked before substitution. The N suffix identifies the 14-pin PDIP configuration shown in the verified Texas Instruments part-details data.
Typical uses include RS-232 interfaces in data-terminal equipment, data-communications equipment, industrial control systems, point-of-sale equipment, printers, and legacy serial-port adapters. It is particularly useful where multiple RS-232 channels share a common logic interface and a through-hole package is preferred for serviceability or manual assembly.
PCB layout should keep each driver output away from sensitive analog and high-speed digital traces because RS-232 transitions can produce edge-related EMI. The data input pins must be driven only when the supply is valid, and unused outputs should be handled according to the manufacturer datasheet rather than left as floating high-impedance nodes. Confirm output polarity and logic levels before interchanging it with a receive/transceiver device.
直接替換替代品，適用於 MC1488N — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC1488N （相同外形與佔位） — 差異在於 Package, Product Type.
MC1488P
✅ 直接替換聯絡詢價
查看資料表 →SN75188N
✅ 直接替換聯絡詢價
查看資料表 →SN55188N
✅ 直接替換📋 參考替代品（不在目錄中）
MC1488N 規格
| Product Type | Quadruple RS-232 line driver |
| Driver Channel Count | 4 channels |
| Logic and Supply | 5 V |
| Output Current | 10 mA typical current-limited output |
| Power-Off Output Impedance | 300 ohm minimum |
| Slew Rate Control | Controlled by load capacitance |
| Compliance | ANSI EIA/TIA-232-E and ITU-T Recommendation V.28 |
| 工作溫度範圍 | 0 degrees C to 70 degrees C |
| 封裝 | 14-pin PDIP, 0.300 inch pitch, 7.62 mm |
| 腳位數 | 14 pins |
| 安裝類型 | Through-hole |
| Supply-Voltage Protection | Series diode at each supply-voltage terminal |
| Original-Design Compatibility | Designed to be interchangeable with Motorola MC1488 |
MC1488N 14-pin pdip, 0.300 inch pitch, 7.62 mm 腳位配置指南
MC1488N（14-pin pdip, 0.300 inch pitch, 7.62 mm 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： MC1488N.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC1488N 適用於 6 應用s: Legacy RS-232 Data-Terminal Equipment, Industrial Serial Control Interfaces, Printer and Point-of-Sale Interfaces, Multi-Port Communications Equipment, Serviceable Through-Hole Control Boards, Data-Terminal Equipment to DCE Links.
Legacy RS-232 Data-Terminal Equipment
The MC1488N fits legacy data-terminal equipment that must translate 5 V logic into four RS-232 driver outputs. According to the Texas Instruments manufacturer datasheet, the monolithic device is intended to interface DTE with data-communications equipment and supports ANSI EIA/TIA-232-E operation. Its four independent driver channels reduce the number of packages required for multi-channel equipment, while 10 mA typical current limiting provides defined output behavior. Engineers should preserve the series-diode supply arrangement shown in the typical application and verify timing against the slowest connected receiver.
推薦
Industrial Serial Control Interfaces
The MC1488N is suitable for industrial equipment that requires multiple legacy RS-232 ports but does not require receive channels in the same package. Its four 5 V line drivers, 10 mA typical current-limited outputs, and 300 ohm minimum power-off impedance match the core requirements of classic RS-232 driver circuits. The 14-pin PDIP format also remains practical for serviceable industrial control boards. Before deployment, engineers should verify ground-reference strategy, cable length, driver loading, and the industrial ambient temperature expected at the equipment enclosure.
推薦
Printer and Point-of-Sale Interfaces
The MC1488N can provide the transmit-side interface used by legacy printer and point-of-sale equipment that still exposes RS-232 ports. Four driver channels allow shared controller outputs to serve multiple external serial devices, provided each channel is configured and wired independently. The device's current-limited outputs and load-capacitance-dependent slew rate offer predictable behavior for conventional RS-232 cables. Board-level validation should include cable capacitance, receiver thresholds, grounding, and unplug behavior because these external factors affect signal integrity more than the internal driver alone.
推薦
Multi-Port Communications Equipment
The MC1488N is useful in multi-port communications equipment where several RS-232 transmit paths originate from one controller. Its monolithic four-channel design reduces package count while preserving the voltage-conversion function required between 5 V logic and RS-232 lines. The Texas Instruments family is specified for ANSI EIA/TIA-232-E and ITU-T Recommendation V.28 applications, giving designers a recognized legacy interface family. Each channel should have its own defined connection and protection arrangement, and unused channels should be configured exactly as directed by the manufacturer datasheet.
推薦
Serviceable Through-Hole Control Boards
The 14-pin PDIP package makes the MC1488N practical for control boards assembled with through-hole components or maintained in a service-oriented production environment. The verified Texas Instruments part-details data identifies MC1488N as the N package option with 14 pins and a 0.300-inch, 7.62 mm pitch. Its 0-to-70-degree-C rating suits indoor commercial or industrial enclosure conditions when that range is adequate. Designers should still follow the datasheet's footprint, pin orientation, supply-diode, bypass, and output-routing guidance during PCB layout.
推薦
Data-Terminal Equipment to DCE Links
The MC1488N directly supports the data-terminal-equipment side of a classic RS-232 link to data-communications equipment. According to the Texas Instruments product page, the device was designed for this interface role and uses a diode in series with each supply-voltage terminal in the typical application. Its four channels can serve separate serial links when routing and loading permit. Integration engineers should confirm logic polarity, driver enable or power-off behavior, connector pin assignment, and the signal-ground reference before connecting equipment from different manufacturers.
推薦
推薦產品摘要
工程參考資料，適用於 MC1488N — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC1488P | SN75188N | SN55188N |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | PDIP-14, 0.300 inch pitch, 7.62 mm | PDIP-14 | PDIP-14 | PDIP-14 |
| Product Type | Quadruple RS-232 line driver | Quadruple RS-232 line driver | Quadruple RS-232 line driver | Quadruple RS-232 line driver |
| Driver Channels | 4 | 4 | 4 | 4 |
| RS-232 Compliance | ANSI EIA/TIA-232-E and ITU-T Recommendation V.28 | ANSI EIA/TIA-232-E and ITU-T Recommendation V.28 | ANSI EIA/TIA-232-E and ITU-T Recommendation V.28 | ANSI EIA/TIA-232-E and ITU-T Recommendation V.28 |
主要差異化特點
- Four RS-232 outputs in one package (對比SN75188N)
- Explicit Motorola MC1488 interchangeability (對比MC1488P)
- Defined current-limited output behavior (對比SN55188N)
設計說明
Use the manufacturer datasheet footprint and preserve pin-1 orientation before assigning the 14-pin PDIP footprint. Keep the series diodes at the supply-voltage terminals in the positions shown by the typical application. Route each RS-232 output directly toward its connector or protection structure, and avoid sharing narrow traces with unrelated high-speed signals because output transitions can create reflected-wave and EMI problems on long copper runs.
Do not treat the MC1488N as an RS-232 transceiver: it provides driver outputs, not receiver inputs. Confirm input polarity, supply sequencing, and output behavior against the manufacturer datasheet. The verified data identifies a 10 mA typical current-limited output and 300-ohm minimum power-off impedance, so downstream protection and load design must not assume unlimited drive current or zero-impedance outputs.
Place any connector protection, clamping, or filtering components close to the RS-232 connector and route the protected output toward the driver. This reduces the antenna length of high-energy cable transients. Keep ground and logic-return paths short, and observe the datasheet's recommended supply bypass and grounding arrangement. Because slew rate is influenced by load capacitance, excessive cable or protection capacitance should be checked against receiver and timing requirements.
合規資訊
The supplied verified web results do not state the MC1488N's RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No compliance status has been assumed.
