Analog Devices Inc./Maxim Integrated 78P7200L-IH

Overview

The 78P7200L-IH from Teridian Semiconductor is a single-chip E3/DS3/STS-1 line interface transceiver IC with integrated clock recovery and transmitter pulse shaping for 75-Ω coaxial cable up to 1100 ft. It supports 34.368 Mbps (E3), 44.736 Mbps (DS3), and 51.84 Mbps (STS-1) AMI-coded signals, operates from 3.3 V or 5 V, and consumes <110 mA. It is used in DSLAMs, SONET add/drop multiplexers, and ATM WAN access routers.

For engineers reviewing the 78P7200L-IH datasheet, 78P7200L-IH pinout, 78P7200L-IH application, or 78P7200L-IH equivalent, this page delivers verified technical context, real-world timing behavior, standard-compliant jitter performance, and precise package-level design meaning - all validated against Teridian's Rev 6.0 July 2005 datasheet.

Technical Context

The 78P7200L-IH implements adaptive equalization and phase-locked loop (PLL) clock recovery without external crystal or reference clock, achieving jitter tolerance per ITU-T G.823 (E3) and Telcordia GR-499-CORE (DS3). Its receiver accepts transformer- or capacitor-coupled AMI inputs (B3ZS/HDB3 coded) and recovers RCLK, RPOS, and RNEG with ≤7 ns data setup/hold times at CL = 15 pF.

The transmitter generates compliant AMI pulses via LOUT+/LOUT− using a 1:2 center-tapped transformer and 301-Ω termination, with E# pin-selectable pulse shaping for E3 (RFO = 6.81 kΩ, E# low), DS3 (RFO = 5.23 kΩ, E# high), or STS-1 (RFO = 4.53 kΩ, E# float); LBO pin enables amplitude boost for ≥225 ft cable runs.

Key Specifications

Pinout & Package

78P7200L-IH is supplied in a 28-pin Plastic Leaded Chip Carrier (PLCC) package, RoHS-compliant per ordering code suffix /F, with lead-free finish. Pin 1 is marked by corner notch; body dimensions are 0.485–0.495 inches square × 0.165–0.180 inches height (12.319–12.573 mm × 4.191–4.572 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 78P7200 and 78P2241B, the 78P7200L-IH adds critical diagnostics (LPBK), clock polarity control (ICKP), and multi-standard configurability (E#), enabling fewer external components, broader protocol support, and faster field validation - making it the preferred choice for new E3/DS3/STS-1 line card designs.

Availability

78P7200L-IH is available at Aetrix Electronics and suitable for DSLAM line cards, SONET add/drop multiplexers, and ATM WAN access routers requiring stable component supply across extended product lifecycles in telecom infrastructure.

Supply support for 78P7200L-IH 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

Teridian Semiconductor Corporation was a fabless analog/mixed-signal IC designer focused on metrology, communications, and power management solutions before its acquisition by Maxim Integrated in 2010.

The 78P7200L-IH belongs to Teridian's line interface transceiver product line, engineered specifically for carrier-class E3/DS3/STS-1 physical layer interfacing in telecom access and transport equipment.

FAQ

What standards does the 78P7200L-IH comply with for E3/DS3/STS-1 applications?

The 78P7200L-IH complies with ANSI T1.102-1993, Telcordia GR-499-CORE and GR-253-CORE, ITU-T G.703 and G.823 for jitter tolerance, and ATM Forum af-phy-0034 (E3 public UNI) and af-phy-0054 (DS3 public UNI). These certifications ensure interoperability with global carrier networks and adherence to physical layer timing and pulse-shape requirements defined in each standard.

How does the 78P7200L-IH achieve clock recovery without an external crystal oscillator?

The 78P7200L-IH uses an internal phase-locked loop (PLL) with an auxiliary frequency-sensitive acquisition loop that locks directly to the incoming AMI data stream. This architecture eliminates the need for an external crystal or reference clock, reducing bill-of-materials cost and PCB area while maintaining jitter tolerance per ITU-T G.823 and Telcordia GR-499-CORE specifications - a key feature confirmed in the functional description on datasheet Page 3.

What is the purpose of the E# pin on the 78P7200L-IH, and how should it be configured?

The E# pin on the 78P7200L-IH selects the operational standard: pulled low for E3 (34.368 Mbps), high for DS3 (44.736 Mbps), or left floating for STS-1 (51.84 Mbps). This pin configures both the receiver equalizer response and transmitter pulse shape/amplitude, enabling single-hardware support for all three rates - a capability explicitly documented in the "OPERATION SPEED" section on datasheet Page 3.

Can the 78P7200L-IH drive 75-Ω coaxial cable over 1100 feet, and what receiver performance enables this?

Yes, the 78P7200L-IH supports 75-Ω coaxial cable up to 1100 feet. Its adaptive equalizer compensates for over 12 dB of cable loss and 6 dB of flat loss, while the variable-gain differential amplifier maintains constant output level regardless of input voltage swing. The datasheet specifies a minimum peak differential input amplitude of 104 mV_pk for E3 - equivalent to 950 mV_pk at source after 1100 ft (13.2 dB loss) - confirming full-range operation.

What are the key differences between the 78P7200L-IH and the earlier 78P7200 in terms of pinout and functionality?

The 78P7200L-IH adds LPBK (pin 28/PLCC), ICKP (pin 10/PLCC), and removes obsolete OPT! and OPT@ pins. It also eliminates several external passive components required by the 78P7200 (e.g., C2, L1, L2, CPD shorts) per datasheet Page 20. While pin-compatible with 78P7200 in 28-pin PLCC, the 78P7200L-IH is not drop-in compatible due to revised pin functions and simplified external circuitry - a distinction noted in the mechanical drawing on Page 21.