Texas Instruments SN74ALVCH162820DLR

Overview

SN74ALVCH162820DLR from Texas Instruments is a 3.3-V, 10-bit edge-triggered D-type flip-flop with dual true outputs (Q1/Q2 per bit) and 3-state outputs, designed for 1.65-V to 3.6-V VCC operation in high-density bus-interface applications. It features bus-hold circuitry on all data inputs, integrated 26-Ω output series resistors, and operates across –40°C to 85°C.

For engineers reviewing the SN74ALVCH162820DLR datasheet, SN74ALVCH162820DLR pinout, SN74ALVCH162820DLR application, or SN74ALVCH162820DLR equivalent, key selection criteria include dual-output timing alignment, 3-state bus-driving capability without external termination, bus-hold input retention, and SSOP-56 package compatibility with space-constrained logic interface designs.

Technical Context

This device implements ten independent D-type flip-flops, each triggered on the positive edge of CLK, with synchronous data capture and dual buffered Q outputs per channel. Output-enable (OE) controls all 20 outputs simultaneously into high-impedance or active states without affecting internal flip-flop operation or data retention.

The architecture integrates EPIC™ submicron CMOS process technology, enabling low-voltage operation down to 1.65 V while maintaining 150-MHz maximum clock frequency and <6.4-ns typical propagation delay (CLK to Q). Bus-hold circuitry eliminates need for external pullup/pulldown resistors on all ten D inputs.

Key Specifications

Pinout & Package

SN74ALVCH162820DLR is housed in a 56-pin Plastic Shrink Small-Outline Package (SSOP), DL package variant, with 0.5-mm lead pitch, JEDEC MO-118 compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit dual-output flip-flop applications.

Compared with SN74ALVCH162820DLR, SN74ALVCH16373DLR lacks edge-triggering and dual outputs but offers transparent latching, while SN74LVC16373ADLR provides greater width and speed at the cost of narrower VCC range and no bus-hold - making SN74ALVCH162820DLR optimal for low-voltage, noise-prone, dual-output bus interfaces.

Availability

SN74ALVCH162820DLR is available at Aetrix Electronics and suitable for memory interface buffering, high-density data bus isolation, hot-swappable module control, and low-power industrial I/O expansion requiring stable component supply and long-term industrial temperature support.

Supply support for SN74ALVCH162820DLR 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 decades of innovation in high-reliability interface and timing products.

SN74ALVCH162820DLR belongs to TI's Widebus™ family of advanced bus-interface logic, engineered specifically for high-speed, low-voltage, noise-immune data path management in industrial, communications, and computing systems.

FAQ

What is the recommended power-up sequence for SN74ALVCH162820DLR?

TI recommends tying OE to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power-up and power-down transitions. This prevents bus contention before system initialization completes. The SN74ALVCH162820DLR does not require specific VCC ramp rate control, but monotonic rise above 1.65 V is necessary for functional operation.

Does SN74ALVCH162820DLR support mixed-voltage operation between inputs and outputs?

Yes - SN74ALVCH162820DLR accepts input voltages from 0 V to VCC (VI range: 0–VCC), and its outputs swing rail-to-rail within the same VCC domain. When interfacing with lower-voltage logic (e.g., 1.8-V microcontrollers), use VCC = 1.8 V; for 3.3-V systems, operate at VCC = 3.3 V. No external level shifters are needed as long as all signals reference the same VCC.

How does the bus-hold feature function on SN74ALVCH162820DLR data inputs?

The bus-hold circuitry on each D input of SN74ALVCH162820DLR actively maintains the last valid logic state (high or low) when the input is floating or disconnected, drawing ±75 µA at VCC = 3 V. This eliminates external pullup/pulldown resistors and prevents metastability during configuration changes or connector mating - critical in modular industrial hardware.

Can SN74ALVCH162820DLR drive unterminated PCB traces reliably?

Yes - SN74ALVCH162820DLR integrates 26-Ω series resistors on all 20 outputs, which dampen signal reflections on unterminated traces up to ~10 cm in length at 150 MHz. This design eliminates external termination components and simplifies layout for compact, cost-sensitive board designs without sacrificing signal integrity.

What is the thermal performance of SN74ALVCH162820DLR in the DL package?

SN74ALVCH162820DLR in the DL (SSOP-56) package has a junction-to-ambient thermal impedance (θJA) of 56°C/W. At maximum rated ambient temperature (85°C) and worst-case power dissipation (~68 pF × 10 MHz × 3.3² V ≈ 7.4 mW), junction temperature remains well below 125°C - confirming suitability for convection-cooled industrial environments without heatsinking.