Texas Instruments SN74ALVCH16820DLR

Overview

SN74ALVCH16820DLR 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, 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 address/data latching and bus interface applications.

For engineers reviewing the SN74ALVCH16820DLR datasheet, SN74ALVCH16820DLR pinout, SN74ALVCH16820DLR application, or SN74ALVCH16820DLR equivalent, key selection criteria include its dual-output architecture, 56-pin TSSOP (DGG) package, 150-MHz max clock frequency, bus-hold input retention, and independent OE control for segmented bus driving.

Technical Context

This device implements ten independent D-type flip-flops, each triggered on the positive edge of CLK, with true Q1 and Q2 outputs per channel and separate 1OE/2OE controls enabling/disabling two groups of five outputs each. Internal bus-hold circuitry maintains stable logic states on undriven D inputs without external resistors.

It supports mixed-voltage interfacing across 1.65–3.6 V VCC, delivers ±24 mA output drive at 3 V, and meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM). Outputs enter high-impedance state when OE is high, with no effect on internal flip-flop operation.

Key Specifications

Pinout & Package

SN74ALVCH16820DLR is packaged in a 56-pin TSSOP (DGG) with 0.5-mm pitch, 13.9 mm × 6.1 mm body size, and 1.2 mm max height, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16820DLR, SN74ALVCH162244DLR provides no storage capability but offers simpler signal buffering, while SN74LVC16373ADLR delivers higher channel count at the expense of bus-hold and dual-output functionality-making SN74ALVCH16820DLR uniquely suited for synchronous, fault-resilient, dual-path latching.

Availability

SN74ALVCH16820DLR is available at Aetrix Electronics and suitable for memory subsystems, FPGA interconnects, industrial I/O expansion, and JTAG test infrastructure requiring stable component supply, long-term manufacturability, and consistent parametric performance.

Supply support for SN74ALVCH16820DLR 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 expertise in high-reliability interface and timing devices.

The SN74ALVCH16820DLR belongs to TI's Widebus™ family of advanced CMOS logic, engineered specifically for high-speed, low-voltage bus interface and data latching in space-constrained, mixed-voltage digital systems.

FAQ

What is the function of the dual outputs (Q1 and Q2) in SN74ALVCH16820DLR?

Each of the ten flip-flops in SN74ALVCH16820DLR provides two identical true outputs (Q1 and Q2), allowing simultaneous connection to separate downstream circuits-such as feeding one output to a memory controller and the other to an error-checking unit-without adding external fanout buffers. This architecture reduces signal skew and improves system-level timing predictability in SN74ALVCH16820DLR-based designs.

Does SN74ALVCH16820DLR require external pullup or pulldown resistors on its data inputs?

No. SN74ALVCH16820DLR integrates active bus-hold circuitry on all D1–D10 inputs, which maintains the last valid logic state when inputs are floating or undriven. This eliminates the need for external pullup or pulldown resistors, simplifying PCB layout and reducing BOM cost-confirmed by TI's datasheet SCES035G and functional description.

What is the recommended power-up sequence for SN74ALVCH16820DLR to ensure high-impedance outputs at startup?

To guarantee outputs remain in high-impedance state during power-up, TI specifies that OE inputs (1OE and 2OE) must be tied to VCC through a pullup resistor. The minimum resistance value depends on the driver's current-sinking capability; for SN74ALVCH16820DLR, a 10-kΩ resistor is commonly used. This ensures safe bus initialization before firmware configures the device.

Can SN74ALVCH16820DLR operate reliably at 1.65 V supply voltage?

Yes. SN74ALVCH16820DLR is fully specified from 1.65 V to 3.6 V, with guaranteed timing (e.g., 150-MHz max clock), voltage thresholds (VIH/VIL), and output drive (±4 mA at 1.65 V) across this full range. Its design targets low-voltage FPGAs and battery-powered systems where 1.8-V or 1.65-V operation is mandatory.

What package type and dimensions does SN74ALVCH16820DLR use?

SN74ALVCH16820DLR uses the TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm body, 1.2 mm max height, 0.5-mm lead pitch. It complies with JEDEC MO-153, features exposed thermal pad compatibility, and supports standard reflow profiles (MSL Level-1, 260°C peak). Pin 1 orientation follows quadrant Q1 in tape-and-reel packaging.