MC1489N - Quad RS-232 Line Receiver | Texas Instruments
MPN： MC1489N ✓ 啟用中MC1489N 概覽
A line receiver is an interface-circuit category used to convert bipolar RS-232 signals into logic-level signals suitable for digital equipment. In the broader hierarchy, a receiver belongs to an interface IC, then to a communications or transceiver IC, and ultimately to the semiconductor family. The MC1489N is a receive-only counterpart to RS-232 driver ICs and is suitable wherever a design needs multiple incoming serial-data channels but no integrated transmit channels.
The principal features include four independent receivers, a low-power Schottky implementation, approximately 7 kΩ input resistance, a ±30 V input signal range, and operation from one 4.5 V to 5.5 V supply. Built-in input hysteresis provides double switching thresholds, which helps prevent noise from repeatedly changing receiver output states around a transition point. The response-control terminals provide additional control over receiver thresholds and noise filtering.
Technically, the MC1489N separates the high-voltage RS-232 input domain from the digital output domain. Each channel accepts a bipolar signal referenced to the receiver's ground, while the receiver's response-control terminal can be connected to a resistor or to a resistor and bias-voltage source. This arrangement permits circuit-level adjustment when a system requires particular threshold or filtering behavior.
Typical applications include multi-channel serial data acquisition, industrial control links, legacy peripheral interfaces, test equipment, point-to-point communications equipment, and systems requiring several RS-232 inputs. The 14-pin PDIP package also makes the device suitable for through-hole prototypes and designs assembled with conventional DIP sockets.
When laying out a board around the MC1489N, keep each input route away from fast digital switching nodes and connect its response-control network close to the relevant receiver pin. Because the device is receive-only, a separate RS-232 driver is required for a design that also needs to transmit. The supplied manufacturer and distributor sources do not publish a complete verified pin table or current unit price in the retrieved data.
This page consolidates the verified manufacturer description, package and supply information, distributor availability references, and carefully qualified replacement candidates. It also adds comparison, application, and design guidance that is not normally visible in a short distributor listing, while clearly separating verified facts from values that still require datasheet or distributor confirmation.
直接替換替代品，適用於 MC1489N — 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。
SN75189AN
✅ 直接替換📋 參考替代品（不在目錄中）
SN75C189N
✅ 直接替換📋 參考替代品（不在目錄中）
SN75C189AN
✅ 直接替換📋 參考替代品（不在目錄中）
DS1489AN
✅ 直接替換📋 參考替代品（不在目錄中）
MC1489N 規格
| Device Type | Quadruple RS-232 line receiver |
| Number of Receiver Channels | 4 channels |
| Receiver Architecture | Monolithic low-power Schottky |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Input Signal Range | -30 V to +30 V |
| Input Resistance | 7 kΩ |
| Input Hysteresis | Built-in double thresholds |
| Response Control | One response-control terminal per receiver |
| Response-Control Configuration | Resistor or resistor and bias-voltage source |
| Interface Standard | TIA/EIA-232-F |
| 封裝 | 14-pin PDIP |
| 安裝類型 | Through-hole |
MC1489N 14-pin pdip 腳位配置指南
MC1489N（14-pin pdip 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： MC1489N.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC1489N 適用於 6 應用s: Legacy RS-232 Data Acquisition, Industrial Control Terminal, Multi-Channel Test Equipment, Instrument Serial Interface, Point-to-Point Communication Equipment, Serial Peripheral Interface Board.
Legacy RS-232 Data Acquisition
The MC1489N fits four-channel legacy RS-232 data acquisition because each receiver accepts the specified -30 V to +30 V bipolar input range while operating from a single 4.5 V to 5.5 V supply. Its built-in hysteresis helps prevent repeated output transitions near the switching threshold. The IC is used between an RS-232 cable and a digital controller, where four incoming signals must be converted to logic levels. Because MC1489N has no transmit channels, the acquisition system still needs a separate driver such as MAX232DR for bidirectional links.
推薦
Industrial Control Terminal
MC1489N is applicable to an industrial control terminal that receives commands from an RS-232 master. Four independent receivers support multiple discrete signals, while the 4.5 V to 5.5 V supply range permits operation from a regulated 5 V rail. The response-control terminal on each channel can support threshold shifting or input-noise filtering where the interconnect is noisy. Designers must verify the unqualified temperature range from the complete datasheet and should isolate long external cables from sensitive digital circuitry.
推薦
Multi-Channel Test Equipment
The four receiver channels in MC1489N allow one test-equipment interface module to monitor several incoming RS-232 signals. Its 7 kΩ input resistance and double-threshold hysteresis are useful when interpreting long or moderately noisy cable connections, and its 14-pin PDIP package simplifies through-hole laboratory assembly. The receiver converts bipolar cable levels into logic-compatible outputs for counters, processors, or data-acquisition hardware. Add protection appropriate to the cable environment and verify that the selected logic levels match the controller.
推薦
Instrument Serial Interface
MC1489N can serve as the receive section of a laboratory instrument's RS-232 command interface. Four channels are useful for handshake, status, and data inputs, while the single 5 V-compatible supply simplifies power planning. Built-in hysteresis improves noise immunity around logic transitions, and the response-control connections allow additional filtering if the external connector introduces chatter. The 14-pin PDIP footprint is particularly convenient for prototypes that require socketed through-hole assembly or a manually fabricated interface board.
推薦
Point-to-Point Communication Equipment
In point-to-point communication equipment, MC1489N can receive multiple RS-232 lines from a remote data-terminal while preserving a simple single-supply design. Its four channels reduce the number of receiver packages required when the protocol uses separate data and control signals. The -30 V to +30 V input range covers the stated interface signal range, while hysteresis helps distinguish valid logic states in a noisy environment. A separate transmitter remains necessary, and cable routing should minimize coupling into the high-impedance input paths.
推薦
Serial Peripheral Interface Board
MC1489N is useful on a legacy serial peripheral board that needs four incoming RS-232 signals but only one or no outgoing signals. The receive-only architecture avoids paying for unused driver sections, and the 14-pin PDIP package is easy to prototype or socket. Its response-control feature allows a board designer to tune threshold behavior or add filtering on individual channels. This topology is especially useful for status, acknowledgment, and remote-enable inputs, provided the external connector and ground reference are handled according to the interface requirements.
推薦
推薦產品摘要
工程參考資料，適用於 MC1489N — 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 | SN75189AN | SN75C189N | SN75C189AN | DS1489AN |
|---|---|---|---|---|---|
| Package | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP | 14-pin PDIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Receiver Channels | 4 | 4 | 4 | 4 | 4 |
| Supply Voltage Range | 4.5 V to 5.5 V | Not stated in supplied comparison data | Not stated in supplied comparison data | Not stated in supplied comparison data | Not stated in supplied comparison data |
| Input Signal Range | -30 V to +30 V | Not stated in supplied comparison data | Not stated in supplied comparison data | Not stated in supplied comparison data | Not stated in supplied comparison data |
| Input Resistance | 7 kΩ | Not stated in supplied comparison data | Not stated in supplied comparison data | Not stated in supplied comparison data | Not stated in supplied comparison data |
| Response Control | Separate CONT terminal for each receiver | Functional details not quantified in supplied comparison data | Functional details not quantified in supplied comparison data | Functional details not quantified in supplied comparison data | Functional details not quantified in supplied comparison data |
| Input Hysteresis | Built-in double thresholds | Not stated in supplied comparison data | Not stated in supplied comparison data | Not stated in supplied comparison data | Not stated in supplied comparison data |
| Interface Standard | TIA/EIA-232-F | RS-232 receiver family | RS-232 receiver family | RS-232 receiver family | RS-232 receiver family |
主要差異化特點
- Four-channel receive-only architecture (對比MAX232DR)
- Wide bipolar receiver input range (對比SN75C189N)
- Per-channel response control (對比SN75189AN)
設計說明
Route the four RS-232 inputs away from clock, relay, and high-current switching traces. The MC1489N specifies approximately 7 kΩ input resistance and built-in double-threshold hysteresis, but those features do not replace good signal integrity. Keep the unused side of each receiver output in a defined logic state, maintain a common ground reference between connected equipment, and avoid long parallel input runs that can couple adjacent channel noise into one another.
Do not treat the MC1489N as a complete RS-232 transceiver. It contains four receivers but no integrated transmitters, so a bidirectional design requires a separate line-driver IC. Also avoid confusing the -30 V to +30 V input-signal range with the power-supply range: the device itself is powered from 4.5 V to 5.5 V. Before substitution, verify that response-control connections and logic-threshold behavior are equivalent in the replacement part.
Use the response-control terminals for circuit-level threshold shifting or noise filtering where required by the interface environment. The Texas Instruments product description states that a resistor, or a resistor and bias-voltage source, can be connected between each CONT terminal and the corresponding circuit node. Place these network components close to the IC, use a low-noise ground reference, and verify switching margins at the connected receiver's logic thresholds.
合規資訊
The retrieved manufacturer and distributor snippets do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable because MC1489N is a legacy RS-232 interface IC rather than an automotive-qualified device.