Texas Instruments SCAN921821TSM/NOPB

Overview

SCAN921821TSM/NOPB from Texas Instruments is a dual-channel 18-bit parallel-to-serial LVCMOS/LVTTL-to-BLVDS serializer with embedded clock, 8-level pre-emphasis per channel, IEEE 1149.1 (JTAG) compliance, and at-speed BIST PRBS generation. It operates from 15–66 MHz (2.376 Gbps total throughput), delivers >15 kV HBM ESD protection on Bus LVDS I/O pins, and uses a single +3.3 V supply in an industrial −40°C to +85°C temperature range.

For engineers reviewing the SCAN921821TSM/NOPB datasheet, SCAN921821TSM/NOPB pinout, SCAN921821TSM/NOPB application, or SCAN921821TSM/NOPB equivalent, key selection considerations include dual-channel BLVDS serialization with pre-emphasis for lossy backplanes, JTAG test access, at-speed BIST for link integrity verification, and NFBGA-100 package compatibility with high-density routing constraints.

Technical Context

The SCAN921821TSM/NOPB integrates two independent serializer blocks, each with its own PLL (no external components required), dedicated TxCLK input, PWDN/EN/SYNC control, and 3-bit PEMx select lines enabling eight discrete pre-emphasis levels. Each channel converts 18-bit parallel data into a single differential BLVDS stream with embedded clock, eliminating clock-to-data skew and simplifying timing closure.

Its IEEE 1149.1 TAP controller supports boundary-scan testing and enables at-speed BIST via PRBS-15 pattern generation on either or both channels. The device features separate power domains-AVDD/DVDD/PVDD-with dedicated ground planes (AVSS/DVSS/PVSS)-and robust noise immunity via BLVDS signaling with 450–550 mV differential output voltage and <70 ps channel-to-channel skew.

Key Specifications

Pinout & Package

SCAN921821TSM/NOPB is housed in a compact 100-ball NFBGA (NZD) package with 0.8 mm ball pitch, optimized for high-speed signal integrity and thermal performance in space-constrained industrial and telecom modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel parallel-to-serial conversion applications.

Compared with SN65LV1023A and DS90CR288A, SCAN921821TSM/NOPB uniquely delivers dual 18-bit serialization with integrated JTAG, at-speed BIST, and 8-level pre-emphasis-making it the only option for industrial backplane systems requiring concurrent link integrity verification and loss compensation.

Availability

SCAN921821TSM/NOPB is available at Aetrix Electronics and suitable for high-speed backplane interconnect, FPGA-to-FPGA communication, automated test equipment, and industrial camera link interface applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SCAN921821TSM/NOPB 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-speed interface ICs and industrial-grade signal conditioning solutions.

The SCAN921821TSM/NOPB belongs to TI's high-speed serializer product line, designed specifically for deterministic, low-skew parallel-to-serial conversion in mission-critical industrial, telecom, and test equipment where signal integrity, testability, and long-term supply stability are mandatory.

FAQ

What is the maximum operating frequency of the SCAN921821TSM/NOPB?

The SCAN921821TSM/NOPB supports a clock rate range of 15 MHz to 66 MHz, delivering up to 2.376 Gbps total throughput across both channels. At 66 MHz, each 18-bit channel achieves 1.188 Gbps, verified under recommended operating conditions (3.15–3.45 V, −40°C to +85°C) with PRBS-15 pattern loading and worst-case load conditions.

Does the SCAN921821TSM/NOPB require external PLL components?

No, the SCAN921821TSM/NOPB integrates a fully self-contained PLL with no external components required. Its internal PLL locks to the TxCLK input and generates the precise high-speed serial clock needed for serialization, eliminating external crystals, capacitors, or loop filters and reducing design complexity and board area.

How does the pre-emphasis feature work on the SCAN921821TSM/NOPB?

The SCAN921821TSM/NOPB provides 8-level selectable pre-emphasis per channel via three control pins (PEMA0–2 or PEMB0–2). Each level adjusts the high-frequency content of the BLVDS output to counteract interconnect loss, with measured output voltage ratios (QPOV) ranging from 1.10× to 2.50× nominal VOD, enabling optimization for specific cable or backplane characteristics.

Is the SCAN921821TSM/NOPB compatible with IEEE 1149.1 (JTAG) boundary-scan?

Yes, the SCAN921821TSM/NOPB is fully IEEE 1149.1-compliant, featuring dedicated TDI, TDO, TMS, TCK, and TRST pins. Its integrated TAP controller supports boundary-scan instruction register access, data register scanning, and at-speed BIST activation-enabling structural testing and debug without modifying the application logic.

What package type and thermal characteristics does the SCAN921821TSM/NOPB use?

The SCAN921821TSM/NOPB uses a 100-ball NFBGA (NZD) package with 0.8 mm pitch, measuring 10 mm × 10 mm. Its thermal resistance is θJA = 35°C/W and θJC = 11.1°C/W, with a maximum junction temperature of +150°C and derating of 28.57 mW/°C above 25°C ambient, supporting reliable operation in convection-cooled industrial enclosures.