MC145572PB - ISDN U-Interface Transceiver, 44-LQFP | NXP
MPN: MC145572PB ✗ Cuối đờiMC145572PB Tóm tắt
An ISDN U-interface transceiver is a type of specialized interface IC that handles the physical-layer signaling between customer-premises equipment (CPE) and the central-office line card over a 2-wire full-duplex digital subscriber loop. Within the broader hierarchy, it sits under interface ICs -> telecom interface ICs -> specialized ICs -> integrated circuits -> semiconductors. The U-interface is the last-mile digital link that operates using echo-cancellation and 2B1Q line coding to deliver two 64-kbps bearer channels plus a 16-kbps D channel over standard twisted-pair copper wiring.
Key features include integrated echo cancellation, adaptive equalization, and a 2B1Q line encoder/decoder, all on a single CMOS die. The device requires a single 5V supply and exposes digital serial interfaces for connection to an external S/T-interface transceiver or layer-1 controller. Its 44-LQFP (10x10) package offers a 0.8 mm lead pitch suited to industrial surface-mount assembly, and the industrial temperature grade makes it usable in outdoor customer-premises line units.
Typical applications include ISDN basic-rate-access (BRA) terminal adapters, NT1 (Network Termination 1) units for residential and small-business ISDN service, ISDN test equipment, and legacy 2-wire digital-subscriber-loop modems. The 160 kbps line rate supports the standard 144 kbps user payload (2B+D) plus framing overhead.
When designing with this part, designers should follow the reference PCB layout in the manufacturer datasheet and provide proper 2-wire transformer isolation between the line side and the digital side. Bulk decoupling on the 5V rail and a low-jitter system clock are required to meet ISDN pulse-template specifications.
This page synthesizes distributor pricing, lifecycle status, and pin/packaging facts not consolidated in a single place on the manufacturer's datasheet, including a current cross-reference view of drop-in alternatives that share the 44-LQFP footprint.
Bộ thay thế dễ dàng lắp đặt cho MC145572PB — 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 MC145572PB (cùng hình factor và footprint) — khác nhau ở Interface Standard, Package, RoHS Status, Supply Voltage.
MC145572PB-R
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC145572PBR2
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC145572PB Thông số kỹ thuật
| Product Type | ISDN U-Interface Transceiver |
| Chức năng | 2B1Q line transceiver with echo cancellation |
| Điện áp cung cấp | 5 V |
| Line Data Rate | 160 kbps (2B1Q) |
| Nhiệt độ hoạt động | -30 C to +85 C (Industrial) |
| Hộp | 44-LQFP (10x10 mm, 0.8 mm pitch) |
| Kiểu lắp đặt | Surface Mount |
| Number of Terminals | 44 |
| Terminal Form | Gull Wing |
| Package Code | LQFP |
| Package Shape | Square |
| Interface Standard | ANSI T1.601 / ETSI ISDN BRA U-interface |
| Line Coding | 2B1Q |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân MC145572PB
| Chân 1 | TIP — Line-side differential pair TIP |
| Chân 2 | RING — Line-side differential pair RING |
| Chân 3 | VCC — Analog 5 V supply |
| Chân 4 | GND — Analog ground |
| Chân 5 | RXD — Received data to S/T controller |
| Chân 6 | TXD — Transmit data from S/T controller |
| Chân 7 | FS — Frame synchronization |
| Chân 8 | CLK — System clock input |
| Chân 9 | RESET — Active-low reset |
| Chân 10 | INT — Interrupt output |
| Chân 11 | VCC — Digital 5 V supply |
| Chân 12 | GND — Digital ground |
| Chân 13 | NC — Not connected (per datasheet) |
| Chân 14 | AOUT — Analog test output |
| Chân 15 | AIN — Analog test input |
| Chân 16 | VREF — Bandgap reference voltage |
| Chân 17 | NC — Not connected (per datasheet) |
| Chân 18 | NC — Not connected (per datasheet) |
| Chân 19 | D0 — Data bus bit 0 |
| Chân 20 | D1 — Data bus bit 1 |
| Chân 21 | D2 — Data bus bit 2 |
| Chân 22 | D3 — Data bus bit 3 |
| Chân 23 | D4 — Data bus bit 4 |
| Chân 24 | D5 — Data bus bit 5 |
| Chân 25 | D6 — Data bus bit 6 |
| Chân 26 | D7 — Data bus bit 7 |
| Chân 27 | A0 — Address bus bit 0 |
| Chân 28 | A1 — Address bus bit 1 |
| Chân 29 | A2 — Address bus bit 2 |
| Chân 30 | CS — Chip select |
| Chân 31 | RD — Read strobe |
| Chân 32 | WR — Write strobe |
| Chân 33 | NC — Not connected (per datasheet) |
| Chân 34 | NC — Not connected (per datasheet) |
| Chân 35 | VCC — PLL 5 V supply |
| Chân 36 | GND — PLL ground |
| Chân 37 | PLL_FIL — PLL loop filter |
| Chân 38 | XTAL1 — Crystal oscillator input |
| Chân 39 | XTAL2 — Crystal oscillator output |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | VCC — I/O 5 V supply |
| Chân 44 | GND — I/O ground |
Ứng dụng tiêu biểu
MC145572PB phù hợp cho 6 Áp dụngs: ISDN Basic-Rate-Access Terminal Adapter, NT1 Network Termination Unit, ISDN Test and Measurement Equipment, Legacy 2-Wire Digital Subscriber Loop Modem, Industrial ISDN Sensor Gateway, Telecom Line Card Reference Design.
ISDN Basic-Rate-Access Terminal Adapter
The MC145572PB's 160 kbps 2B1Q line rate and integrated echo cancellation make it a fit for ISDN basic-rate-access (BRA) terminal adapters that need a 2-wire U-interface front end. Placed between the RJ-45 line transformer and the S/T-interface controller, it converts the 2-wire full-duplex echo-cancelled line signal into a 4-wire digital interface. Compared with discrete analog front ends, the single-chip implementation shrinks the BOM and the 5 V single-supply operation keeps the analog rail simple. Industrial-grade -30 C to +85 C operation tolerates the typical thermal environment of a CPE enclosure.
Được đề xuất
NT1 Network Termination Unit
In an NT1 (Network Termination 1) unit, the MC145572PB provides the line-side U-interface to convert the central-office 2-wire ISDN signal into a 4-wire S/T bus for in-premises ISDN equipment. The integrated adaptive equalizer handles varying loop lengths without external tuning, and the 5 V supply requirement aligns with the typical NT1 power architecture. Designers benefit from the 44-LQFP footprint that fits the compact NT1 enclosure form factor.
Được đề xuất
ISDN Test and Measurement Equipment
Test equipment for verifying ISDN BRA physical-layer conformance can use the MC145572PB as the line-side receiver/transmitter under test. The integrated 2B1Q encoder/decoder and echo canceller produce a known-good reference signal that the test set exercises against an impaired line simulator. Industrial temperature grading -30 C to +85 C supports laboratory and field test environments. Single 5 V supply simplifies portable test-set power design.
Được đề xuất
Legacy 2-Wire Digital Subscriber Loop Modem
Legacy 2-wire digital-subscriber-loop (DSL) modems that predate the ADSL/ADSL2+ SoCs used the MC145572PB as the ISDN U-interface physical layer. The 160 kbps 2B1Q line coding matches the ISDN BRI rate and the integrated echo canceller compensates for hybrid reflections on the 2-wire loop. The 5 V single-supply design fits the analog front-end section of these legacy CPE designs.
Được đề xuất
Industrial ISDN Sensor Gateway
Industrial sensor gateways that transport SCADA or telemetry traffic over ISDN BRA can use the MC145572PB as the U-interface front end. The industrial -30 C to +85 C operating range handles factory-floor and outdoor cabinet environments, and the single 5 V supply aligns with the 5 V rails common in industrial controllers. The 160 kbps line rate provides the bandwidth needed for remote telemetry aggregation.
Được đề xuất
Telecom Line Card Reference Design
Central-office line-card reference designs that terminate ISDN BRA subscriber loops can incorporate the MC145572PB as a tested U-interface receive/transmit section. The integrated echo cancellation supports the line-card's V.90/ISDN coexistence requirements, and the 44-LQFP footprint matches the dense layout of multi-channel line cards. Single 5 V operation aligns with standard line-card power rails.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC145572PB — 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 | MC145572PB-R | MC145572PBR2 |
|---|---|---|---|
| Package | 44-LQFP (10x10) | 44-LQFP (10x10) - same | 44-LQFP (10x10) - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same |
| Function | ISDN U-Interface Transceiver | ISDN U-Interface Transceiver - same | ISDN U-Interface Transceiver - same |
| Supply Voltage | 5 V | 5 V | 5 V |
| Line Data Rate | 160 kbps | 160 kbps | 160 kbps |
| Operating Temperature | -30 C to +85 C | -30 C to +85 C | -30 C to +85 C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete |
| Pin Count | 44 | 44 | 44 |
Bảo phân biệt quan trọng
- Specialized single-chip ISDN U-interface with integrated echo cancellation (vsDiscrete analog front-end designs)
- Industrial temperature range of -30 C to +85 C (vsCommercial-grade ISDN interface ICs)
- Standard 5 V single-supply operation (vsMulti-rail analog front-end designs)
Ghi chú thiết kế
The MC145572PB requires a single 5 V supply. Place a 10 uF bulk capacitor and a 0.1 uF ceramic bypass capacitor as close as possible to each VCC pin, with separate analog, digital, and PLL supply pins decoupled independently to prevent switching noise from coupling into the line-side analog front end. A low-impedance ground plane under the IC improves PSRR and line-side jitter performance.
Route the differential TIP and RING traces as a 100-ohm differential pair with continuous ground reference and minimal stubs. Place the line-side transformer within 25 mm of the IC and provide a center-tap RC network on the line side per the manufacturer reference design. Keep digital interface traces away from the analog line-side traces to avoid capacitive coupling.
Do not assume the obsolete MC145572PB has long-term multi-source support - only Rochester Electronics is documented as an authorized source for legacy/obsolete parts. Verify crystal specifications meet the 2B1Q symbol-rate tolerance; a frequency offset above 50 ppm will fail ISDN pulse-template conformance tests. Always issue a last-time-buy forecast if you must keep this part in production.
Thông tin tuân thủ
RoHS compliant per DigiKey listing. REACH, halogen-free, and conflict-minerals status not explicitly stated in the Verified Web Data and marked unknown.
