MC145572PB - ISDN U-Interface Transceiver, 44-LQFP | NXP
N.º de pieza: MC145572PB ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.77 | $1.377,00 |
| 500 | $12.1 | $6.050,00 |
| 1.000 | $10.45 | $10.450,00 |
MC145572PB Descripción general
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.
Alternativas directas para MC145572PB — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC145572PB (mismo factor de forma y huella) — difiere en Interface Standard, Package, RoHS Status, Supply Voltage.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC145572PB-R
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC145572PBR2
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$5.2 / unidad
Ver hoja de datos →MC145572PB Especificaciones
| Product Type | ISDN U-Interface Transceiver |
| Función | 2B1Q line transceiver with echo cancellation |
| Tensión de alimentación | 5 V |
| Line Data Rate | 160 kbps (2B1Q) |
| Temperatura de funcionamiento | -30 C to +85 C (Industrial) |
| Encapsulado | 44-LQFP (10x10 mm, 0.8 mm pitch) |
| Tipo de montaje | 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 |
| Estado RoHS | Compliant |
| Lead-Free | Yes |
Configuración de pines de MC145572PB
| Pin 1 | TIP — Line-side differential pair TIP |
| Pin 2 | RING — Line-side differential pair RING |
| Pin 3 | VCC — Analog 5 V supply |
| Pin 4 | GND — Analog ground |
| Pin 5 | RXD — Received data to S/T controller |
| Pin 6 | TXD — Transmit data from S/T controller |
| Pin 7 | FS — Frame synchronization |
| Pin 8 | CLK — System clock input |
| Pin 9 | RESET — Active-low reset |
| Pin 10 | INT — Interrupt output |
| Pin 11 | VCC — Digital 5 V supply |
| Pin 12 | GND — Digital ground |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | AOUT — Analog test output |
| Pin 15 | AIN — Analog test input |
| Pin 16 | VREF — Bandgap reference voltage |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | D0 — Data bus bit 0 |
| Pin 20 | D1 — Data bus bit 1 |
| Pin 21 | D2 — Data bus bit 2 |
| Pin 22 | D3 — Data bus bit 3 |
| Pin 23 | D4 — Data bus bit 4 |
| Pin 24 | D5 — Data bus bit 5 |
| Pin 25 | D6 — Data bus bit 6 |
| Pin 26 | D7 — Data bus bit 7 |
| Pin 27 | A0 — Address bus bit 0 |
| Pin 28 | A1 — Address bus bit 1 |
| Pin 29 | A2 — Address bus bit 2 |
| Pin 30 | CS — Chip select |
| Pin 31 | RD — Read strobe |
| Pin 32 | WR — Write strobe |
| Pin 33 | NC — Not connected (per datasheet) |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | VCC — PLL 5 V supply |
| Pin 36 | GND — PLL ground |
| Pin 37 | PLL_FIL — PLL loop filter |
| Pin 38 | XTAL1 — Crystal oscillator input |
| Pin 39 | XTAL2 — Crystal oscillator output |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | VCC — I/O 5 V supply |
| Pin 44 | GND — I/O ground |
Aplicaciones típicas
MC145572PB es adecuado para 6 aplicacións: 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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
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.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC145572PB — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | 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 |
Diferenciadores clave
- Specialized single-chip ISDN U-interface with integrated echo cancellation (frente a Discrete analog front-end designs)
- Industrial temperature range of -30 C to +85 C (frente a Commercial-grade ISDN interface ICs)
- Standard 5 V single-supply operation (frente a Multi-rail analog front-end designs)
Notas de diseño
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.
Información de cumplimiento
RoHS compliant per DigiKey listing. REACH, halogen-free, and conflict-minerals status not explicitly stated in the Verified Web Data and marked unknown.
