Texas Instruments SN74ALVCH16820DGGR

Overview

SN74ALVCH16820DGGR from Texas Instruments is a 3.3-V, 10-bit edge-triggered D-type flip-flop with dual Q outputs (Q1/Q2 per bit) and 3-state outputs, operating across 1.65 V to 3.6 V supply range, featuring bus-hold circuitry on all data inputs and two independent output-enable controls (1OE/2OE), used in high-density data latching and bus interface applications in telecom backplanes and industrial control I/O modules.

For engineers reviewing the SN74ALVCH16820DGGR datasheet, SN74ALVCH16820DGGR pinout, SN74ALVCH16820DGGR application, or SN74ALVCH16820DGGR equivalent, key selection considerations include its dual-output architecture per bit, 56-pin TSSOP package with verified pin mapping, bus-hold input retention, and timing parameters including 150 MHz max clock frequency, 4.8 ns typical propagation delay, and 1.4 ns minimum setup time at 3.3 V.

Technical Context

This device implements ten independent D-type flip-flops, each with true and complementary outputs (Q1/Q2), triggered on the positive edge of CLK. Two separate output-enable inputs (1OE and 2OE) independently control groups of outputs, enabling selective 3-state drive without affecting internal latch states.

Bus-hold circuitry actively maintains valid logic levels on all ten D inputs when undriven-eliminating external pullup/pulldown resistors. The design supports mixed-voltage interfacing within the 1.65–3.6 V range and meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM).

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package, 13.9 mm × 6.1 mm × 1.2 mm max height, lead pitch 0.5 mm, RoHS-compliant NiPdAu finish, MSL Level-1 (260 °C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit latch/register applications.

Compared with SN74ALVCH16820DGGR, SN74ALVCH162244DGGR lacks clocking and storage-making it unsuitable for timing-critical capture-but matches pinout and bus-hold for simple buffering. SN74LVC16373ADGGR offers more bits and drive but sacrifices dual outputs and input retention, increasing BOM and layout complexity in floating-input scenarios.

Availability

SN74ALVCH16820DGGR is available at Aetrix Electronics and suitable for telecom backplane latching, industrial I/O module buffering, test equipment pattern generation, automated test fixture control, and high-reliability embedded data acquisition requiring stable component supply and long-term lifecycle support.

Supply support for SN74ALVCH16820DGGR 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications electronics.

The SN74ALVCH16820DGGR belongs to TI's Widebus™ family of advanced CMOS logic devices, designed specifically for high-speed, low-voltage, high-pin-count bus interface and data latching in space-constrained industrial and telecom systems.

FAQ

What is the maximum clock frequency supported by the SN74ALVCH16820DGGR?

The SN74ALVCH16820DGGR supports a maximum clock frequency of 150 MHz across its full operating voltage range (1.65 V to 3.6 V), as specified in the timing requirements table of the official datasheet. This value is guaranteed under recommended conditions (e.g., VCC = 3.3 V, TA = 25 °C) and applies to all ten flip-flop channels simultaneously. The SN74ALVCH16820DGGR achieves this performance with a typical propagation delay of 4.8 ns and minimal setup/hold times, making it suitable for high-speed synchronous data capture in demanding applications.

Does the SN74ALVCH16820DGGR have built-in bus-hold circuitry, and how does it affect system design?

Yes, the SN74ALVCH16820DGGR integrates active bus-hold circuitry on all ten D inputs, eliminating the need for external pullup or pulldown resistors. This feature maintains valid logic states on unterminated or floating inputs-critical in high-density PCB layouts where routing constraints prevent discrete biasing. The SN74ALVCH16820DGGR's bus-hold current is ±75 µA at VCC = 3 V, ensuring reliable retention without increasing static power or compromising noise margins. It simplifies BOM and improves reliability in hot-swap or modular systems.

How many output-enable controls does the SN74ALVCH16820DGGR provide, and what is their functional scope?

The SN74ALVCH16820DGGR provides two independent buffered output-enable inputs: 1OE and 2OE. Each controls a distinct group of five dual-output pairs (i.e., 10 Q1/Q2 outputs split into two 5-bit banks). These controls place their respective outputs in high-impedance state without affecting internal flip-flop operation-allowing new data to be clocked in or old data retained while outputs are disabled. This architecture enables flexible bus sharing and staggered enable timing, a capability not found in single-OE alternatives like the SN74LVC16373ADGGR.

What package type and dimensions does the SN74ALVCH16820DGGR use, and is it RoHS-compliant?

The SN74ALVCH16820DGGR is packaged in a 56-pin TSSOP (Thin Shrink Small Outline Package), designated DGG, with dimensions of 13.9 mm × 6.1 mm × 1.2 mm max height and 0.5 mm lead pitch. It features NiPdAu lead finish, is RoHS-compliant (per TI's packaging addendum), and rated MSL Level-1 (unlimited floor life at ≤30 °C/60% RH). The SN74ALVCH16820DGGR's compact footprint and thermal characteristics (θJA = 64 °C/W) make it suitable for dense, thermally constrained industrial PCBs.

Can the SN74ALVCH16820DGGR operate reliably at 1.8 V, and what are the key timing implications?

Yes, the SN74ALVCH16820DGGR is fully specified for operation at 1.8 V (within its 1.65–3.6 V range). At VCC = 1.8 V, the maximum clock frequency remains 150 MHz, though propagation delay increases to 5.9 ns (typ) and setup time rises to 1.7 ns (min). The SN74ALVCH16820DGGR maintains full functionality-including bus-hold and 3-state control-at this voltage, enabling seamless integration with 1.8 V FPGAs and low-power microcontrollers without level-shifting circuitry.