Analog Devices Inc./Maxim Integrated DS21602N

Overview

DS21602N from Maxim Integrated is a 3.3V/5V dual-output clock rate adapter IC for T-carrier/E-carrier interconversion, supporting 1.544MHz ↔ 2.048MHz frequency translation with phase-aligned CLKOUT1 (T1/E1), CLKOUT2 (6.176MHz), and SYNCOUT (8kHz). It operates across industrial temperature range and serves as direct replacement for LXP602 in telecom line interface units.

For engineers reviewing the DS21602N datasheet, DS21602N pinout, DS21602N application, or DS21602N equivalent, key selection criteria include frame-sync alignment capability, low-jitter output compliance with G.823/TR62411, SEL-controlled mode switching, and dual-supply compatibility without external components.

Technical Context

The DS21602N implements an analog PLL-based frequency conversion architecture with feedback divider and frame-sync generator. It supports two fixed conversion modes via SEL pin: high-to-low (2.048MHz → 1.544MHz) and low-to-high (1.544MHz → 2.048MHz), both yielding CLKOUT2 at 6.176MHz and a locked 8kHz SYNCOUT.

All outputs are frequency-locked to CLKIN with phase alignment to SYNCIN (8kHz or integer subrates). Jitter transfer peaks at ~1.6 ns/ns in 4–8kHz band, meeting G.823 (0.035 UI_P-P) and TR62411 (0.012 UI_P-P typ) specifications for 2.048MHz→1.544MHz conversion.

Key Specifications

Pinout & Package

DS21602N uses an 8-pin PDIP package (package code P8+8), with pins arranged in dual-inline configuration suitable for through-hole mounting in legacy telecom hardware.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar clock rate adaptation applications.

Compared with LXP602SE and DS21602SN, the DS21602N delivers identical timing performance and functional behavior in an 8-pin DIP package optimized for field-replaceable modules and repair scenarios where through-hole mounting is mandated.

Availability

DS21602N is available at Aetrix Electronics and suitable for DSLAM line cards, E1/T1 multiplexers, base station Abis interfaces, and legacy PBX timing modules requiring stable component supply across extended product lifecycles.

Supply support for DS21602N 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) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for communications, industrial, and computing markets.

The DS21602N belongs to Maxim's telecom timing portfolio, designed specifically to replace legacy LXP60x clock adapters in carrier-grade T1/E1 infrastructure with enhanced jitter performance and dual-supply flexibility.

FAQ

What clock frequencies does the DS21602N support on CLKIN and CLKOUT1?

The DS21602N supports CLKIN at either 1.544MHz (T1) or 2.048MHz (E1). CLKOUT1 outputs the complementary rate: 2.048MHz when CLKIN is 1.544MHz (SEL = 0), and 1.544MHz when CLKIN is 2.048MHz (SEL = 1). This bidirectional conversion is fixed per device variant and confirmed in Table 2-A of the DS21602N datasheet.

Is the DS21602N pin-compatible with the LXP602SE it replaces?

Yes, the DS21602N is fully pin-compatible with the LXP602SE, sharing identical pin functions, ordering codes (e.g., DS21602N vs. LXP602N), and electrical behavior. The DS21602N datasheet explicitly states "direct drop-in replacement" and provides pin cross-reference Table 1-B confirming matching assignments for SYNCOUT/FSO, CLKOUT2/HFO, CLKIN/CLKI, etc.

Does the DS21602N require external passive components for PLL operation?

No, the DS21602N requires no external passive components for PLL operation. Its analog PLL, dividers, and frame-sync generator are fully integrated. The datasheet states "No External Components Required" under Features and confirms this in the Functional Description section, eliminating need for loop filter capacitors or crystal loads.

What is the maximum allowable jitter on CLKOUT1 for DS21602N in G.823 compliance mode?

The DS21602N guarantees ≤0.035 UI_P-P maximum output jitter on CLKOUT1 for 2.048MHz→1.544MHz conversion in the 20Hz–100kHz band per ITU-T G.823 specification. This value is specified in Table 3-A and verified across -40°C to +85°C, making DS21602N suitable for carrier-class timing applications.

Can the DS21602N generate phase-aligned outputs using SYNCIN?

Yes, the DS21602N supports phase alignment of CLKOUT1, CLKOUT2, and SYNCOUT to SYNCIN. When SYNCIN (8kHz or integer subrate) is asserted, all three outputs synchronize within ≤50ms. Timing diagrams Figure 4-1 and Figure 4-2 confirm deterministic edge alignment relative to SYNCIN, critical for framer and mapper co-timing.