MC1489NG4 - Quad RS-232 Line Receiver 5V 14-PDIP | Texas Instruments
MPN: MC1489NG4 ✓ AktifMC1489NG4 Ringkasan
A line receiver is the input-side element of an RS-232 physical-layer link. In the RS-232 signaling hierarchy, a driver (such as the companion MC1488 quad line driver) places high-swing bipolar voltages on the cable, and the receiver at the far end must sense these large, sometimes noisy signals and restore clean digital logic. Receivers therefore combine wide input voltage tolerance, input current limiting to tolerate fault voltages, and a defined logic threshold that distinguishes the mark (negative) and space (positive) states.
Key features of the MC1489NG4 include four receivers in one package for multi-signal RS-232 ports (RXD, CTS, DSR, DCD), a response-control pin per receiver that lets the designer add filtering capacitors to suppress noise transients, input thresholding optimized for RS-232 levels, and operation from the ubiquitous 5 V logic supply. The classic PDIP package makes the part convenient for breadboarding, through-hole industrial boards, and legacy equipment repair.
Architecturally, each receiver uses an input network that safely clamps or limits RS-232 fault voltages followed by a high-gain comparator stage with hysteresis-style level detection, producing a saturated logic output. This circuit arrangement achieves reliable reception over long, unterminated cable runs where RS-232 drivers impose swings of several volts on the pair, even in the presence of ground-potential differences between equipment.
Typical applications include industrial equipment serial ports, point-of-sale terminals, CNC and instrumentation RS-232 interfaces, telecom modems, and repair or extension of legacy RS-232-based systems that were designed in the era of through-hole components.
A key design consideration: the response-control pins allow a capacitor to ground on each channel to filter noise, but added capacitance slows edge response, so filter values should be chosen against the intended baud rate.
This page synthesizes distributor availability, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternatif penggantian untuk MC1489NG4 — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MC1489NG4 (sama faktor bentuk dan footprint) — berbeda di dalam Package, Mounting Type, Input Resistance, Interface Standard, Operating Temperature Range.
MC1489AN
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →MC1489AP
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →MC1489AJ
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
SN75189AN
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
MC1489NG4 Spesifikasi
| Fungsi | Quad RS-232 Line Receiver |
| Receiver Count | 4 |
| Driver/Receiver Configuration | 0/4 (receivers only) |
| Tegangan Pemuat | 5 V (single supply) |
| Input Compatibility | RS-232 levels |
| Output Compatibility | TTL/CMOS logic levels |
| Response Control | Yes, one per receiver (noise filtering) |
| Paket | 14-PDIP (0.300 inch, 7.62 mm) |
| Tipe Mounting | Through Hole |
| Jumlah Pin | 14 |
| Protocol | RS-232 |
MC1489NG4 14-pdip (0.300 inch, 7.62 mm) Diamant Konfigurasi Panduan
Konfigurasi pin untuk MC1489NG4 (14-pdip (0.300 inch, 7.62 mm) pakai pakai). Penomoran pin, fungsi, dan diagram koneksi ditetapkan dalam datasheet produsen. Lihatnya untuk footprint dan pedoman perpindahan paruh.
Tidak ada data diatribut pin yang tersedia untuk MC1489NG4.
Lihat ke: datasheet produk untuk konfigurasi pin penuh.
Aplikasi Umum
MC1489NG4 cocok untuk 6 aplikasis: Industrial Equipment RS-232 Ports, Point-of-Sale and Retail Terminals, Instrumentation and Test Equipment Serial Interfaces, Legacy Telecom Modem Equipment, Breadboarding and Educational RS-232 Labs, Building Automation and Security Panel Interfaces.
Industrial Equipment RS-232 Ports
Factory equipment such as PLCs, CNC controllers, motor drives, and process instruments has long used RS-232 for configuration, monitoring, and programming links. The MC1489NG4 fits this role because it receives four independent RS-232 signals (RXD, CTS, DSR, DCD) from one 5 V-supplied package and its through-hole 14-pin PDIP body matches the sockets of boards built during the era when RS-232 was the dominant industrial interface. Its response-control pins allow a small capacitor per channel to reject noise picked up on cable runs across electrically noisy factory floors, at the cost of slower edges that must be budgeted against the baud rate. In maintenance work the MC1489NG4 is a direct socket-in replacement for failed receivers.
Direkomendasikan
Point-of-Sale and Retail Terminals
Receipt printers, barcode scanners, cash drawers, and payment terminals historically communicate over RS-232, and millions of installed units still require receiver ICs for repair and spares. The MC1489NG4 provides four receiver channels in one 14-pin PDIP package on a 5 V logic rail, matching the board architecture of these terminals, which typically used through-hole construction. Its TTL-compatible outputs connect directly to the terminal microprocessor or UART, and the response-control pins support light input filtering for counters and shop floors where fluorescent lighting and switch-mode power supplies inject transients into long serial cables. Because the part remains active and stocked in legacy channels, service depots can keep these terminals alive economically rather than replacing them.
Direkomendasikan
Instrumentation and Test Equipment Serial Interfaces
Bench instruments, data loggers, environmental monitors, and laboratory equipment commonly expose RS-232 ports for remote control via SCPI-style commands. The MC1489NG4 implements the receive side of such a port: RS-232 bipolar line levels are sensed by the wide-tolerance receiver inputs and delivered to the instrument microcontroller as clean 5 V TTL logic. Four channels per package cover RXD plus the RTS/CTS/DSR handshake set. The response-control feature is useful in instrumentation because it lets the designer suppress contact bounce and line noise on the handshake lines without affecting the data channel, applying filtering per channel. Its decades-long production record also means documented, field-proven behavior for safety-relevant instruments.
Direkomendasikan
Legacy Telecom Modem Equipment
Dial-up modems, multiplexers, and telecom line equipment were designed around full RS-232 DTE/DCE interfaces with eight or more signals. The MC1489NG4 supplies four receive channels per package, and a two-receiver design covers a complete port while the companion MC1488 driver covers the four transmit-direction signals. The 5 V supply and 14-pin PDIP footprint match the board standards of that equipment generation, so the part is a natural repair component for telecom racks still in service in industrial and utility settings. Its defined input thresholds separate the negative mark and positive space states reliably even with the ground-potential differences typical of equipment spread across a site.
Direkomendasikan
Breadboarding and Educational RS-232 Labs
The through-hole 14-pin PDIP package of the MC1489NG4 plugs directly into solderless breadboards and 0.3 inch DIP sockets, making it a preferred part for teaching RS-232 physical-layer concepts and for quick lab prototyping. Students can observe mark and space levels on the receiver inputs with an oscilloscope, experiment with the response-control pin by adding filter capacitors and watching edge slowing, and verify TTL-level conversion at the outputs against a 5 V rail. Combining the MC1489NG4 with the MC1488 driver demonstrates the complete driver-receiver link that underlies later interface standards such as RS-485 and USB-era differential signaling, providing durable hands-on grounding in serial communication fundamentals.
Direkomendasikan
Building Automation and Security Panel Interfaces
Access control panels, alarm concentrators, and HVAC controllers frequently retain RS-232 service ports for commissioning tools and central-station reporting modems. The MC1489NG4 receives four signals per package on the panel's existing 5 V rail and its PDIP construction matches the through-hole boards common in that product generation. Field serviceability is the decisive parameter: the receiver inputs tolerate the level excursions that occur on long cable runs between buildings, and the per-channel response-control pins let service technicians add noise filtering to handshake lines affected by nearby contactors or radio transmitters without redesigning the data channel. Keeping an active, second-source-friendly receiver in production simplifies long-term panel maintenance contracts.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MC1489NG4 — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | MC1489AN | MC1489AP | MC1489AJ | SN75189AN |
|---|---|---|---|---|---|
| Package | 14-PDIP (0.300 inch) | 14-PDIP - same footprint | 14-PDIP - same footprint | 14-PDIP ceramic - same footprint | 14-PDIP - same footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Function | Quad RS-232 line receiver (0/4) | Quad RS-232 line receiver (0/4) | Quad RS-232 line receiver (0/4) | Quad RS-232 line receiver (0/4) | Quad RS-232 line receiver (0/4) |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Output Compatibility | TTL-compatible | TTL-compatible | TTL-compatible | TTL-compatible | TTL-compatible |
| Package Material / Mounting | Plastic DIP, through hole | Plastic DIP, through hole | Plastic DIP, through hole | Ceramic DIP, through hole | Plastic DIP, through hole |
Diferensiator Kunci
- Standard MC1489 input characteristic with wider input voltage range (vsMC1489AN)
- Through-hole PDIP matching legacy board sockets (vsMC1489AP)
- Plastic package cost and availability advantage over ceramic (vsMC1489AJ)
Catatan Desain
Do not confuse the MC1489 and MC1489A threshold characteristics when substituting. The MC1489A-type devices specify a higher input turn-on threshold, which improves noise margin on marginal lines, while the standard MC1489 offers a wider input voltage range. Boards designed around one characteristic may malfunction with the other if RS-232 line levels are marginal. Always compare the electrical characteristics tables of both datasheets against the actual line swing in your system before dropping either family member into an existing socket.
Use the response-control pins deliberately. Connecting a small capacitor from each response-control pin to ground filters noise and fast transients on that receiver's input, which is valuable on factory-floor or building-cabling runs. However, capacitance also slows the output edges, so the filter value must be chosen against the baud rate: a filter adequate at 9600 baud may corrupt 115200 baud traffic. Leave the pin open for maximum speed on clean short links, and test filtered channels at the full intended baud rate with realistic cable lengths.
For through-hole legacy boards, keep the 5 V decoupling capacitor (typically 0.1 uF ceramic) directly across the MC1489NG4 supply pins at the socket, since the four receivers switch simultaneously when a burst of serial data arrives, drawing charge steps from the rail. When repairing boards, verify socket pin 1 orientation and inspect for corrosion in old sockets before inserting a new device; the PDIP package tolerates repeated insertion but socket contacts may not. Confirm output loading: TTL-compatible outputs drive standard TTL fan-out and should not be asked to source LED currents directly.
Informasi Konformitas
Compliance status not stated in the retrieved listings; confirm RoHS/REACH status on the Texas Instruments product page or with the sourcing team via the Request a Quote form.
