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Renesas 7290820JG8
- Part No.:
- 7290820JG8
- Manufacturer:
- Renesas
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7290820JG8.pdf
- Description:
- IC MULTIPLEXER 1 X 16:16 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,817
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Product details
Overview
IDT7290820JG8 from Integrated Device Technology, Inc. is a 5V, 2,048 × 2,048 non-blocking time slot interchange (TSI) digital switch optimized for ST-BUS®/GCI and wide frame pulse (WFP) telecommunication interfaces. It supports serial data rates of 2.048 Mb/s, 4.096 Mb/s, or 8.192 Mb/s with per-channel variable or constant throughput delay, JTAG IEEE-1149.1 test port, and 16 RX/TX serial streams - deployed in PCM channel switching, TDM multiplexing, and voice/data concentrators.
For engineers reviewing the IDT7290820JG8 datasheet, IDT7290820JG8 pinout, IDT7290820JG8 application, or IDT7290820JG8 equivalent, key selection considerations include its 84-pin PLCC package (order code J), 5V supply compatibility, per-stream frame offset calibration, Processor/Connection mode flexibility, and support for both Motorola and Intel microprocessor bus interfaces.
Technical Context
The IDT7290820JG8 implements a dual-mode TSI architecture with dedicated data memory (up to 2,048 bytes) and connection memory (16×128 locations), enabling per-channel source address mapping (CAB/SAB bits) and real-time reconfiguration. Its timing unit synchronizes to F0i (8 kHz frame pulse) and CLK (4.096–16.384 MHz), with automatic ST-BUS®/GCI format detection when WFPS = LOW.
It integrates a JTAG boundary-scan controller (TMS/TDI/TDO/TCK/TRST), internal loopback (LPBK bit per channel), and programmable input frame offset registers (FOR) with ±4.5 CLK-period resolution. The ODE pin and OSB bit jointly control TX0–TX15 three-state output drivers, while CCO provides a synchronous 4.096/8.192/16.384 Mb/s control stream derived from connection memory CCO bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Capacity | 2,048 × 2,048 channels @ 8.192 Mb/s; scales to 1,024 × 1,024 @ 4.096 Mb/s or 512 × 512 @ 2.048 Mb/s - defines maximum concurrent PCM time-slot interchanges without blocking. |
| Serial Data Rate | 2.048 / 4.096 / 8.192 Mb/s - determines frame size (32/64/128 slots/frame) and required master clock (CLK = 2× data rate). |
| Throughput Delay Mode | Per-channel selectable Variable (min. 3 time-slots) or Constant (min. 1 frame) delay - preserves voice latency or data frame integrity respectively. |
| Microprocessor Interface | Intel/Motorola compatible, multiplexed or non-multiplexed - eliminates glue logic via IM pin-driven auto-detection of bus timing mode. |
| JTAG Support | IEEE-1149.1 compliant (TMS/TDI/TDO/TCK/TRST) - enables boundary-scan testing and in-system debug without external probes. |
| Operating Voltage | +5.0 V ±5% - requires single-supply rail; all I/O pins are 5V-tolerant. |
| Temperature Range | −40°C to +85°C - qualified for industrial-grade telecom equipment deployment. |
Pinout & Package
Package: 84-pin Plastic Leaded Chip Carrier (PLCC), 0.05″ pitch, 1.15″ × 1.15″ (order code J). Pin 1 marked by index notch; IC pin tied to GND for normal operation and IEEE-1149.1 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RX0–RX15 | Serial input data streams | 16 bidirectional-capable inputs accepting 2.048/4.096/8.192 Mb/s ST-BUS®/GCI/WFP frames; each configurable for independent frame offset calibration. |
| TX0–TX15 | Serial output data streams | 16 three-state outputs driven by data memory or connection memory; output enable controlled globally (ODE/OSB) and per-channel (OE bit). |
| F0i | Frame synchronization input | Accepts 8 kHz frame pulse; automatically detects ST-BUS® (falling-edge aligned) or GCI (rising-edge aligned) format when WFPS = LOW. |
| FE/HCLK | Frame evaluation or HCLK input | In ST-BUS®/GCI mode: measures input frame skew vs. F0i; in WFP mode: provides 4.096 MHz HCLK for frame alignment. |
| CLK | Master serial clock input | Accepts 4.096 MHz (2.048 Mb/s), 8.192 MHz (4.096 Mb/s), or 16.384 MHz (8.192 Mb/s); clock edge determines bit sampling point per interface mode. |
| CS, DS/RD, R/W/WR, AS/ALE, IM, A0–A7, AD0–AD7, D8–D15 | Microprocessor interface signals | Supports Motorola non-multiplexed (16-bit data bus), Motorola multiplexed (AD0–AD7 + D8–D15), and Intel multiplexed modes - selected dynamically via IM and AS/ALE timing. |
| DTA | Data transfer acknowledgment | Active-LOW open-drain signal indicating completion of microport access; transitions HIGH → high-Z to enable faster bus cycles with weak pull-up. |
| CCO | Control channel output | Serial 4.096/8.192/16.384 Mb/s stream carrying CCO bits from connection memory - synchronized to TX streams, output one channel early. |
| ODE | Output drive enable | Global enable/disable for TX0–TX15 drivers; overrides per-channel OE bits when asserted LOW with OSB = LOW. |
| RESET | Asynchronous device reset | Active-LOW Schmitt-trigger input clearing internal registers, counters, and forcing TX outputs into high-Z state; requires ≥100 ns pulse width. |
| WFPS | Wide frame pulse select | When HIGH: enables WFP mode (requires FE/HCLK = 4.096 MHz, CLK = 16.384 MHz); when LOW: enables auto-detect ST-BUS®/GCI mode. |
| TMS, TDI, TDO, TCK, TRST | JTAG test port | IEEE-1149.1 boundary-scan interface; TRST asynchronously resets TAP controller; all pins have internal pull-ups except TDO (high-Z when disabled). |
| IC | Internal connection | Must be connected to GND for functional operation and JTAG compliance; not user-accessible signal path. |
Key Features
| Feature | Design Value |
|---|---|
| Per-stream frame offset calibration | Compensates for inter-stream skew up to ±4.5 CLK periods using programmable FOR registers - critical for multi-chip TSI systems with unequal PCB trace lengths. |
| Processor Mode operation | Enables microprocessor to write time-slot data directly to connection memory for dynamic channel routing - supports real-time status/control exchange in voice gateways. |
| Automatic ST-BUS®/GCI identification | Detects frame sync polarity and bit-clock alignment on F0i without configuration - reduces firmware initialization overhead in mixed-interface systems. |
| Memory block programming | Loads identical upper 5 bits (BPD0–BPD4) across all 2,048 connection memory locations in two frames - accelerates boot-time configuration of broadcast or multicast mappings. |
| Per-channel loopback (LPBK) | Internally routes TXn,Chm → RXn,Chm for diagnostics - isolates physical layer faults without external loopback cables or switches. |
Applications
| Voice over TDM Gateway | PCM Multiplexer/Demultiplexer |
|---|---|
Use Scenario: Aggregating 32 E1 lines (2.048 Mb/s each) into a single 8.192 Mb/s backbone stream while maintaining individual call path isolation. IC Role / Device Role / Timing Role: Time-slot interchange switch performing non-blocking 2,048 × 2,048 channel mapping with variable delay to minimize voice latency. Use Value: Enables sub-100 µs end-to-end voice path delay while supporting per-call rerouting and echo cancellation bypass paths. |
Use Scenario: Inserting/deleting signaling channels (e.g., CAS, CCS) within E1/T1 frames in central office line cards. IC Role / Device Role / Timing Role: Digital switch reassigning time-slot positions between input and output serial streams under microprocessor control. Use Value: Allows dynamic allocation of bandwidth for maintenance, alarms, or protocol conversion without hardware changes. |
| Telecom Network Node Controller | Legacy PBX Channel Bank |
Use Scenario: Interfacing legacy ST-BUS®-based subscriber line interface circuits (SLICs) with modern packet-based backhaul using GCI framing. IC Role / Device Role / Timing Role: Format-transparent TSI bridge converting between ST-BUS® and GCI frame structures via automatic detection and per-stream delay compensation. Use Value: Eliminates need for separate frame aligners or retimers, reducing BOM count and board space in hybrid access nodes. |
Use Scenario: Replacing electromechanical cross-connects in analog/digital hybrid PBX systems requiring 512+ channel scalability. IC Role / Device Role / Timing Role: Centralized time-slot switch managing bidirectional voice/data paths between trunk and station ports. Use Value: Supports hot-swappable port modules and software-defined call routing while maintaining legacy timing compliance (G.703/G.704). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar time slot interchange applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7290820PF | 100-pin TQFP package (0.5 mm pitch, 14 mm × 14 mm); identical electrical specs and register map. | Suitable for higher-density PCB layouts where PLCC footprint is prohibitive; requires different thermal and reflow profile. | Select IDT7290820PF when board space constraints preclude 84-pin PLCC or when automated optical inspection favors QFP packages. |
| IDT7290820PQF | 100-pin PQFP package (0.65 mm pitch, 14 mm × 20 mm); same functionality and timing behavior as IDT7290820JG8. | Offers larger pad pitch for easier manual rework and lower assembly defect rates in low-volume production. | Choose IDT7290820PQF for prototyping, field-replaceable modules, or cost-sensitive industrial telecom designs prioritizing assembly yield. |
Compared with IDT7290820JG8, the PF and PQF variants retain full functional equivalence but differ in mechanical form factor and thermal characteristics - making them drop-in replacements only at the schematic level, while requiring PCB layout revision and requalification of thermal performance and signal integrity.
Availability
IDT7290820JG8 is available at Aetrix Electronics and suitable for voice over TDM gateways, PCM multiplexers, telecom network node controllers, and legacy PBX channel banks requiring stable component supply across extended product lifecycles.
Supply support for IDT7290820JG8 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
Integrated Device Technology, Inc. (IDT) was a fabless semiconductor company specializing in timing, RF, memory interface, and real-time interconnect solutions before its acquisition by Renesas Electronics in 2019.
The IDT7290820JG8 belongs to IDT's legacy TSI digital switch family, engineered specifically for carrier-grade telecommunication infrastructure requiring deterministic time-slot routing, multi-standard interface support, and JTAG-enabled system-level testability.
FAQ
What is the function of the IC pin on the IDT7290820JG8?
The IC pin on the IDT7290820JG8 is an internal connection that must be tied to GND for normal operation. This connection ensures proper biasing of internal circuitry and compliance with IEEE-1149.1 boundary-scan requirements. Leaving IC floating or connecting it to VCC will prevent the IDT7290820JG8 from functioning correctly or passing JTAG tests.
Does the IDT7290820JG8 support both ST-BUS® and GCI interfaces simultaneously?
No - the IDT7290820JG8 automatically detects and configures for either ST-BUS® or GCI format based on the polarity and edge alignment of the F0i frame pulse, but only when WFPS = LOW. It does not operate in dual-format mode; the interface mode is determined per power-on cycle and cannot be switched dynamically during runtime without reinitialization.
How is the master clock (CLK) frequency related to the serial data rate on the IDT7290820JG8?
The CLK frequency must be exactly twice the selected serial data rate: 4.096 MHz for 2.048 Mb/s, 8.192 MHz for 4.096 Mb/s, and 16.384 MHz for 8.192 Mb/s. This 2:1 ratio ensures correct bit sampling timing - rising edge for ST-BUS®, falling edge for GCI - and is enforced by the IDT7290820JG8's internal PLL-free serial interface architecture.
Can the IDT7290820JG8 perform per-channel high-impedance control on TX outputs?
Yes - the IDT7290820JG8 supports per-channel high-impedance control via the OE bit in each connection memory location. When enabled (OE = 1), the corresponding TX output driver enters high-Z state independently of other channels. This capability works alongside global ODE/OSB control and is essential for dynamic channel shutdown in energy-efficient telecom systems.
What is the purpose of the CCO pin on the IDT7290820JG8?
The CCO pin on the IDT7290820JG8 outputs a synchronous serial control stream derived from the CCO bits stored in connection memory. It operates at the same data rate as the main serial streams (4.096/8.192/16.384 Mb/s) and transmits one CCO bit per time-slot, offset by one channel - enabling external logic to monitor or synchronize with internal routing decisions in real time.
7290820JG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 7200
- Package/Case:
- 84-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 1 x 16:16
- Independent Circuits:
- 1
- Current - Output High, Low:
- -
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 84-PLCC (29.31x29.31)
7290820JG8 FAQ
1.How can I place an order for 7290820JG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7290820JG8 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 7290820JG8 reliable?
The price and inventory of 7290820JG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7290820JG8 is usually 5 days.
3.What payment methods are accepted for 7290820JG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7290820JG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7290820JG8?
7290820JG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7290820JG8 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 7290820JG8?
For technical support, including 7290820JG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7290820JG8 requirements.
6.How does Aetrix verify that 7290820JG8 is sourced from the original manufacturer or authorized distributors?
All 7290820JG8 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 7290820JG8 meets industry standards.
7.What is the process for return or replacement of 7290820JG8?
All 7290820JG8 units undergo pre-shipment inspection (PSI). If there is an issue with 7290820JG8, 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 7290820JG8 part is unused and in its original packaging.
Return procedure for 7290820JG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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