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Analog Devices Inc./Maxim Integrated 78P7200-IH
- Part No.:
- 78P7200-IH
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Telecom
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
78P7200-IH.pdf
- Description:
- 1 LINE INTERFACE UNIT
- Quantity:
- Payment:
- Shipping:
Inventory:8,020
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Product details
Overview
The 78P7200-IH from Teridian Semiconductor is a single-chip E3/DS3/STS-1 line interface transceiver IC designed for telecom transport layer interfacing. It performs full AMI encoding/decoding at 34.368 Mbit/s (E3), 44.736 Mbit/s (DS3), or 51.84 Mbit/s (STS-1), features on-chip receive equalization, jitter-tolerant clock recovery without external crystals, and programmable transmit line buildout (LBO) - all operating from a single 5 V supply in a 28-pin PLCC package.
For engineers reviewing the 78P7200-IH datasheet, 78P7200-IH pinout, 78P7200-IH application, or 78P7200-IH equivalent, key selection considerations include its HDB3/B3ZS compatibility, CMOS-level I/O interface with RCLK/RPOS/RNEG outputs, LBO/OPT! configuration logic for rate-specific pulse shaping, and compliance with ANSI T1.102, ITU-T G.703, and Bellcore TR-NWT-000499.
Technical Context
The 78P7200-IH integrates independent receiver and transmitter paths optimized for three standardized telecom rates. Its receiver employs a fixed equalizer followed by a variable-gain amplifier with peak-detection threshold control, enabling wide dynamic range (±0.045 V to ±1.2 V input) and low-signal detection via LOWSIG. The unique clock recovery PLL uses external RLF1/RLF2/CLF1 components to achieve >200 kHz bandwidth and exceeds TR-NWT-000499 Category II jitter tolerance for DS3.
The transmitter accepts CMOS-level TCLK/TPOS/TNEG inputs and generates differential AMI pulses on LOUT+/LOUT− with internal pulse shaping. LBO and OPT! pins configure pulse width and amplitude per rate: LBO=HIGH for short DS3/STS-1 cables (<225 ft), OPT!=HIGH for DS3/STS-1, OPT!=LOW for E3, and OPT@=HIGH for normal operation. Pulse templates meet ANSI T1.102 (DS3/STS-1) and ITU-T G.703 (E3) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rates | Supports 34.368 Mbit/s (E3), 44.736 Mbit/s (DS3), and 51.84 Mbit/s (STS-1) - selectable via OPT! and LBO pin states. |
| Input Encoding | Accepts HDB3 or B3ZS-coded AMI signals - requires framer or PAL to provide coding; no on-chip encoding logic. |
| Receiver Dynamic Range | ±0.045 V to ±1.2 V (AC-coupled); enables reliable operation over long coaxial runs with varying signal loss. |
| Jitter Tolerance | Exceeds TR-NWT-000499 Cat II (DS3) and ITU-T G.823 (E3); high-frequency limit: 0.15–0.3 UIpp (10–800 kHz). |
| Supply & Power | Single 5 V ±5% supply; total supply current 155–190 mA; power dissipation up to 0.93 W at 85°C. |
| Compliance | Fully compliant with ANSI T1.102-1993, ITU-T G.703, Bellcore TR-NWT-000499, GR-253-CORE, and G.823-1991. |
| Operating Temp | -40°C to +85°C ambient - qualified for industrial and telecom central office environments. |
Pinout & Package
Package: 28-pin Plastic Leaded Chip Carrier (PLCC), surface-mount, lead-free option available (78P7200-IH/F). Pin 1 index corner marked; static-sensitive handling required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LIN+, LIN- | Differential receiver inputs | Transformer-coupled AMI signal inputs; require 75 Ω line termination and high-impedance (>15 kΩ) interface. |
| RPOS, RNEG | Unipolar receiver data outputs | CMOS-level active-high outputs synchronized to RCLK rising edge; valid only when LOWSIG is inactive. |
| RCLK | Recovered clock output | CMOS-level clock derived from incoming data; period = 19.29 ns (STS-1), 22.35 ns (DS3), or 29.1 ns (E3). |
| LOWSIG | Low-signal indicator | Active-low open-drain output with 500 µs delay; asserts when input falls below ±20 mV (short cable) or ±50 mV (longer). |
| TPOS, TNEG, TCLK | Transmitter data/clock inputs | CMOS-level inputs; TCLK edge-triggered; pulse width insensitive to TCLK duty cycle. |
| LOUT+, LOUT- | Differential transmitter outputs | Drive center-tapped transformer to generate AMI pulses; output amplitude shaped by LBO/OPT! settings. |
| LBO, OPT!, OPT@ | Configuration control inputs | LBO selects line buildout; OPT! sets rate (HI=DS3/STS-1, LO=E3); OPT@ disables drivers (LO reduces power ~125 mW). |
| RFO, RLF1, RLF2, CLF1, CPD | External timing/filter components | RFO sets loop center frequency (4.53/5.23/6.81 kΩ); RLF1/RLF2/CLF1 set PLL bandwidth (>200 kHz); CPD stabilizes peak detector. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated AMI transceiver | Eliminates need for separate line driver/receiver ICs and external clock sources - reduces BOM count and board area. |
| Crystal-free clock recovery | Uses auxiliary acquisition loop and external RLF/CLF network - avoids crystal cost, layout sensitivity, and aging drift. |
| Programmable line buildout (LBO) | On-chip pulse shaping eliminates discrete LBO networks - supports 0–450 ft cable lengths without redesign. |
| HDB3/B3ZS decoding support | Enables interoperability with standard framer ICs (e.g., TI TSB12LV01, PMC PM5350) without protocol translation logic. |
| Multi-standard compliance | Meets physical layer requirements of ANSI, ITU-T, and Bellcore standards across all three rates - simplifies certification. |
Applications
| E3 Digital Cross-Connect System (DCS) | DS3 Add-Drop Multiplexer (ADM) |
|---|---|
|
Use Scenario: Interfacing between E3 tributary ports and backplane switching fabric in metro DCS nodes. IC Role / Device Role / Timing Role: Line interface transceiver performing AMI encoding/decoding and clock recovery for 34.368 Mbit/s signals. Use Value: Enables direct connection to 75 Ω coaxial infrastructure while maintaining G.703 template compliance and <10 UIpp low-frequency jitter tolerance. |
Use Scenario: Aggregating DS3 feeds from remote sites into SONET OC-12/OC-48 ADM shelves. IC Role / Device Role / Timing Role: Physical layer interface converting framer-generated CMOS data into compliant DS3 AMI line signals. Use Value: Supports LBO configuration for short intra-shelf interconnects and meets ANSI T1.102 pulse mask with <0.3 UIpp high-frequency jitter tolerance. |
| STS-1 SONET Line Card | Legacy Telecom Central Office Interface |
|
Use Scenario: Front-end line interface on STS-1 add/drop or regenerator cards in carrier-class SONET equipment. IC Role / Device Role / Timing Role: Receives and transmits 51.84 Mbit/s AMI signals with embedded clock recovery and jitter filtering. Use Value: Meets GR-253-CORE pulse shape requirements for short cables and provides >200 kHz PLL bandwidth to suppress system-induced jitter. |
Use Scenario: Retrofitting aging E3/DS3 multiplexers with modern, single-chip line interface capability. IC Role / Device Role / Timing Role: Drop-in replacement for discrete transistor-based line drivers and analog comparators. Use Value: Reduces component count by >12 parts per channel, improves temperature stability (-40°C to +85°C), and eliminates manual tuning of external filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar line interface transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TLK2201B | Supports only DS3 (44.736 Mbit/s); no E3 or STS-1 mode; requires external clock source for transmit path. | Limited to DS3-only systems; lacks multi-rate flexibility and crystal-free clock recovery of 78P7200-IH. | Select when DS3-only interface is sufficient and external clock distribution already exists. |
| PMC-Sierra PM5350 (Framer + LIU combo) | Integrated framer + LIU in single package; includes HDB3/B3ZS encode/decode logic; higher integration but larger footprint. | Replaces both framer and line interface functions; not a drop-in replacement - requires full firmware and PCB redesign. | Select when full protocol stack offload (framing + line interface) is needed and board space allows QFP-208 package. |
Compared with TLK2201B and PM5350, the 78P7200-IH uniquely delivers triple-rate (E3/DS3/STS-1) support with fully integrated, crystal-free clock recovery and programmable LBO - making it optimal for multi-standard legacy telecom upgrades where minimal PCB change and proven reliability are critical.
Availability
The 78P7200-IH is available at Aetrix Electronics and suitable for E3 digital cross-connect systems, DS3 add-drop multiplexers, STS-1 SONET line cards, and legacy telecom central office interfaces requiring stable component supply across extended temperature and long product lifecycles.
Supply support for 78P7200-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 was a fabless analog/mixed-signal IC company specializing in precision metrology and telecom interface solutions before its acquisition by Maxim Integrated in 2010.
The 78P7200-IH belongs to Teridian's Line Interface Unit (LIU) product line, engineered specifically for carrier-grade E3/DS3/STS-1 physical layer interfacing in central office and transport equipment.
FAQ
What data rates does the 78P7200-IH support, and how are they selected?
The 78P7200-IH supports 34.368 Mbit/s (E3), 44.736 Mbit/s (DS3), and 51.84 Mbit/s (STS-1) rates. Selection is controlled by the OPT! pin: set HIGH for DS3/STS-1 operation, LOW for E3. LBO pin state further configures pulse shaping per rate and cable length. No software or register programming is required - configuration is purely pin-driven.
Does the 78P7200-IH perform HDB3 or B3ZS encoding, or only decoding?
The 78P7200-IH performs AMI decoding (recovery of clock, RPOS, RNEG) from HDB3- or B3ZS-encoded inputs but does not perform encoding. Transmit path accepts CMOS-level TPOS/TNEG data and generates AMI pulses - encoding must be handled upstream by a framer IC or PAL. This design separates framing logic from physical layer signaling.
What is the purpose of the LOWSIG output on the 78P7200-IH?
The LOWSIG output on the 78P7200-IH is an active-low, open-drain signal that indicates when the received AMI signal amplitude falls below a programmable threshold (±20 mV to ±50 mV depending on CPD configuration). It includes a 500 µs delay to prevent false triggers from transients and must be used alongside framer zero-counting logic to declare loss-of-signal.
How does the 78P7200-IH achieve clock recovery without an external crystal?
The 78P7200-IH uses an internal phase-locked loop with an auxiliary frequency-sensitive acquisition loop that locks independently to incoming data frequency and phase. External components RLF1, RLF2, and CLF1 set the PLL bandwidth (>200 kHz), while RFO adjusts center frequency per data rate - eliminating crystals, tuned circuits, or external clocks required by competing solutions.
What package type and pin count does the 78P7200-IH use, and are there lead-free options?
The 78P7200-IH is supplied in a 28-pin Plastic Leaded Chip Carrier (PLCC) package with gull-wing leads for surface-mount assembly. The standard part is 78P7200-IH; a lead-free variant is available as 78P7200-IH/F, marked with suffix "P4F" and qualified to JEDEC J-STD-020 moisture sensitivity level 3.
78P7200-IH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Line Interface Unit (LIU)
- Interface:
- -
- Number of Circuits:
- 1
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Supply:
- 155mA
- Power (Watts):
- 930 mW
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-PLCC
78P7200-IH FAQ
1.How can I place an order for 78P7200-IH through Aetrix?
Please submit a Request for Quotation (RFQ) for 78P7200-IH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 78P7200-IH reliable?
The price and inventory of 78P7200-IH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 78P7200-IH is usually 5 days.
3.What payment methods are accepted for 78P7200-IH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 78P7200-IH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 78P7200-IH?
78P7200-IH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 78P7200-IH order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 78P7200-IH?
For technical support, including 78P7200-IH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 78P7200-IH requirements.
6.How does Aetrix verify that 78P7200-IH is sourced from the original manufacturer or authorized distributors?
All 78P7200-IH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 78P7200-IH meets industry standards.
7.What is the process for return or replacement of 78P7200-IH?
All 78P7200-IH units undergo pre-shipment inspection (PSI). If there is an issue with 78P7200-IH, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 78P7200-IH part is unused and in its original packaging.
Return procedure for 78P7200-IH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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