MC1488D - Quad EIA-232D Driver | onsemi | RS-232 Interface
料号： MC1488D ✓ 量产中MC1488D 概述
An EIA-232D line driver is a type of RS-232 interface driver that converts logic-level signals into the voltage-domain signals used by RS-232 communications equipment. Within the broader hierarchy, it is a line driver and interface IC within communications and power-management signal conditioning. Its four channels allow one package to support several unidirectional data paths when the system already provides the required receiver and supply circuitry.
Key features include four independent driver channels, typical current-limited output of ±10 mA, and a minimum power-off source impedance of 300 ohms. The current limiting helps control output current when a receiver or connected circuit imposes an abnormal load. The MC1488D also provides simple slew-rate control, an important characteristic for reducing unwanted transitions on slow RS-232 links.
Technically, the device is designed around the EIA-232D interface requirements identified in the onsemi datasheet. Because MC1488D contains drivers rather than receivers, it cannot replace a complete RS-232 transceiver without external receiver circuitry. In a typical interface, logic signals enter the driver inputs and leave through four EIA-232D output channels. The receiver and any required level translation are separate functions.
Typical uses include legacy RS-232 ports, data terminal equipment, data communications equipment, industrial control interfaces, and embedded systems that retain an EIA-232D connection. The MC1488D is also useful as the transmit-side element in a multi-channel interface where a companion receiver IC is already present.
Designers should verify the supported supply voltage, input thresholds, output levels, timing, and absolute maximum ratings directly against the manufacturer datasheet before implementation. PCB layout should preserve short output paths, provide an appropriate ground reference, and avoid placing sensitive analog signals beside the driver outputs.
This page combines verified manufacturer and distributor information, source-backed drop-in candidates, interface-selection guidance, and practical PCB considerations to provide engineering context beyond a basic MC1488D catalog listing.
直接替换替代料： MC1488D ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
SN75188DR
✅ 直接替换📋 参考替代料（不在目录中）
SN75C188D
✅ 直接替换📋 参考替代料（不在目录中）
MC1488D 规格参数
| Product Type | Quad differential line driver |
| Interface Standard | EIA-232D |
| Number of Driver Channels | 4 channels |
| Current-Limited Output | ±10 mA typical |
| Power-Off Source Impedance | 300 ohms minimum |
| Output Slew-Rate Control | Yes |
| 封装 | 14-pin SOIC |
| 安装类型 | Surface mount |
| 引脚数 | 14 pins |
MC1488D 14-pin soic 引脚配置指南
MC1488D（14-pin soic 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MC1488D.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MC1488D 适用于 6 应用s: Legacy RS-232 Transmit Interface, Industrial Control Terminal Interface, Data Terminal Equipment Interface, Instrumentation Control Port, Multi-Channel Data Communications Port, Legacy Peripheral Connection.
Legacy RS-232 Transmit Interface
The MC1488D fits legacy RS-232 transmit interfaces because it provides four EIA-232D driver channels in one 14-pin SOIC package. Its current-limited outputs are specified at ±10 mA typical, and simple slew-rate control helps manage transitions on the driven lines. A system can route four unidirectional logic signals through the device while using a separate receiver for return data. The main engineering check is the otherwise unspecified supply-voltage and logic-threshold range, which must be confirmed from the onsemi datasheet before logic-level compatibility is approved.
推荐
Industrial Control Terminal Interface
The MC1488D is appropriate for industrial terminal equipment that uses EIA-232D as a legacy command or status channel. Four driver outputs can support several unidirectional control signals, while the typical ±10 mA current limit helps contain output drive current. The slow-slew-rate feature is useful for reducing edge-related disturbance on communication wiring. Before deployment, verify the operating temperature range, supply limits, and isolation strategy, none of which is quantified in the supplied search excerpts.
推荐
Data Terminal Equipment Interface
MC1488D was specifically described by onsemi as an interface between data terminal equipment and data communications equipment, matching classic DTE and DCE links. Its four current-limited driver channels provide a compact way to implement several transmit paths. A receiver such as a quad EIA-232D receiver completes the link when two-way communication is needed. The board design should include a stable common ground and routed output protection appropriate to the external cable environment.
推荐
Instrumentation Control Port
The MC1488D can provide the transmit portion of an RS-232 control port on test and measurement equipment. Four channels can carry commands, enables, triggers, or status acknowledgements, while the specified ±10 mA typical current limiting provides defined drive behavior for cable-connected equipment. Because legacy RS-232 links can pick up noise on long cables, use a slow edge rate and consider external protection. Supply voltage and temperature requirements must be checked directly from the manufacturer documentation.
推荐
Multi-Channel Data Communications Port
MC1488D is suitable for data communications equipment requiring four separate unidirectional EIA-232D outputs. Its 14-pin SOIC package allows the interface circuitry to remain compact, and the power-off source impedance is specified at 300 ohms minimum. These characteristics support output-state control when the remote equipment is unpowered. The design should still validate all receiver and transmitter logic levels, propagation delays, and power-supply sequencing because those parameters were not present in the supplied excerpts.
推荐
Legacy Peripheral Connection
MC1488D can support legacy peripherals that expose an EIA-232D output path from a host controller. Logic-level commands can be converted into four current-limited differential outputs, reducing the number of discrete driver packages required. The on-board slew-rate control supports controlled transitions, although cable length and grounding still influence signal integrity. Confirm that the connected peripheral expects EIA-232D rather than RS-422 or RS-485 levels and verify logic thresholds before finalizing the interface.
推荐
推荐产品汇总
工程参考数据： MC1488D ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SN75188DR | SN75C188D |
|---|---|---|---|
| Manufacturer | onsemi | Texas Instruments | Texas Instruments |
| Package | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC |
| Device Type | Quad EIA-232D line driver | EIA-232D line driver | EIA-232D line driver |
| Number of Channels | 4 channels | 4 channels | 4 channels |
| Number of Pins | 14 pins | 14 pins | 14 pins |
关键差异点
- Four integrated EIA-232D transmit channels （对比 MAX232DR)
- Defined current-limited output behavior （对比 SN75188DR)
- Documented power-off output impedance （对比 SN75C188D)
设计说明
Route each EIA-232D driver output directly to its connector or protection network without long shared traces. Keep the ground return continuous and reference each cable-side interface to the same system ground. The MC1488D uses controlled slew rates, but trace geometry and connector return paths still determine whether edges and cable reflections appear at the receiver. Avoid placing sensitive analog inputs immediately beside the four output nets.
Decouple the device supply near its pins with the capacitance and voltage rating specified by the manufacturer for the selected operating condition. The supplied excerpts do not quantify the supply voltage, so no component values can be specified safely. Verify input thresholds against the source logic family and ensure power sequencing cannot violate an absolute maximum rating. If the system uses multiple interface voltages, sequence the MC1488D supply and attached receiver supplies consistently.
Do not treat MC1488D as a full RS-232 transceiver; it provides transmit drivers only. A separate EIA-232D receiver is required for incoming data. Also avoid substituting MC1488P on an MC1488D board because PDIP and SOIC have different land patterns. For SN75188DR or SN75C188D substitutions, compare the complete pin table, supply requirements, thresholds, timing, current limits, and temperature ratings rather than relying only on the shared 14-pin SOIC outline.
EIA-232D driver outputs can radiate transitions if cable routing is poor. Preserve the device's specified slew-rate behavior and avoid adding fast edge-shaping circuits that increase overshoot or ringing. Shielded cable, suitable connector grounding, and a common reference plane are preferable to relying on additional filtering at the source. Validate conducted and radiated emissions in the final enclosure because PCB geometry, cable length, and the connected equipment can dominate system-level EMI behavior.
合规信息
The supplied verified excerpts identify the manufacturer, EIA-232D interface function, and package but do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields therefore remain unknown rather than being inferred.