Analog Devices Inc./Maxim Integrated DS2153QN-A7

Overview

DS2153QN-A7 from Maxim Integrated is an E1 single-chip transceiver (SCT) supporting CEPT PCM-30 and ISDN-PRI interfaces, with on-board clock/data recovery, 32-/128-bit jitter attenuation, and programmable line build-out for 75Ω/120Ω lines. It operates across –40°C to +85°C, uses a 5V supply, and delivers full CAS signaling extraction/insertion in telecom access multiplexers and channel banks.

For engineers reviewing the DS2153QN-A7 datasheet, DS2153QN-A7 pinout, DS2153QN-A7 application, or DS2153QN-A7 equivalent, key selection criteria include E1 framer compliance (ITU G.703/G.704/G.706), dual elastic store support up to 8.192MHz backplanes, independent transmit/receive clock domains, and 44-pin PLCC packaging with Intel/Motorola bus compatibility.

Technical Context

The DS2153QN-A7 integrates a complete E1 framer with FAS/CAS/CRC4 frame alignment, dual two-frame elastic stores for phase/frequency compensation between recovered E1 data and asynchronous backplane clocks (SYSCLK at 1.544/2.048MHz), and fully independent transmit/receive paths with separate RCLK (2.048MHz recovered) and TCLK (2.048MHz primary) timing domains.

Its analog line interface recovers AMI/HDB3 waveforms from twisted-pair cables up to 1.5km, generates G.703-compliant waveshapes, and supports programmable LBO for both 75Ω and 120Ω impedances; the 8-bit parallel control port enables register-level configuration of Sa/Si bits, alarm generation, and three test loopbacks (local, remote, framer).

Key Specifications

Pinout & Package

DS2153QN-A7 is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package, lead-free/RoHS-compliant per DS2153QN+ nomenclature, with thermal pad exposed on underside for enhanced heat dissipation in high-density telecom line cards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar E1 transceiver applications.

Compared with DS2153QN-A7, DS2155Q reduces external analog components but mandates layout revision, while MC145508P lacks critical timing flexibility and fails to meet current ITU G.823 jitter tolerance requirements for metro networks.

Availability

DS2153QN-A7 is available at Aetrix Electronics and suitable for telecom access multiplexers, ISDN-PRI channel banks, and fractional E1 service nodes requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for DS2153QN-A7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The DS2153QN-A7 belongs to Maxim's E1/T1 transceiver product line, engineered specifically for carrier-grade telecom infrastructure requiring full ITU/ETSI compliance, robust jitter handling, and field-proven reliability in central office and remote terminal environments.

FAQ

What is the operating temperature range for DS2153QN-A7?

The DS2153QN-A7 is rated for –40°C to +85°C operation, making it suitable for uncontrolled outdoor cabinets and central office environments. This industrial temperature grade is confirmed in the Ordering Information table and validated across DC/AC characteristics in the datasheet. The DS2153QN-A7 maintains full E1 framer functionality-including jitter attenuation, CAS signaling, and elastic store operation-across this entire range without derating.

Does DS2153QN-A7 support both FAS and CRC4 framing modes?

Yes, DS2153QN-A7 fully supports both FAS (Frame Alignment Signal) and CRC4 (Cyclical Redundancy Check) multiframe alignment per ITU G.704 and G.706. The framer automatically detects and locks to either format, and the RCR1 register provides explicit control over sync/resync criteria for both. CRC4 mode enables error detection and multiframe alignment for E1 links requiring enhanced integrity monitoring.

How does the elastic store function in DS2153QN-A7 improve system timing?

The DS2153QN-A7 implements dual two-frame elastic stores to absorb phase and frequency differences between the recovered E1 data stream and an asynchronous backplane clock applied to SYSCLK. When enabled (RCR2.1 = 1), it allows seamless interfacing with 1.544MHz or 2.048MHz backplane clocks up to 8.192MHz, preventing bit slips and ensuring deterministic data transfer in multi-board TDM systems.

Can DS2153QN-A7 generate programmable output clocks for H0 or H12 services?

Yes, DS2153QN-A7 supports programmable output clocks for fractional E1 services including H0 (384kbps) and H12 (1920kbps). This is achieved through its transmit formatter and channel blocking logic (TCHBLK/RCHBLK), which selectively enable/disable time slots while maintaining G.704 frame structure-enabling service provisioning without external clock dividers or FPGA logic.

Is DS2153QN-A7 pin-compatible with other devices in the DS215x family?

DS2153QN-A7 is pin-compatible with DS2151Q (T1 transceiver) per the datasheet Feature section, allowing reuse of PCB layouts across E1/T1 platforms. However, it is not pin-compatible with DS2155Q (integrated line driver) or DS2152Q (dual-E1 variant), as those devices have different pin assignments for analog I/O and control signals.