Texas Instruments TLC0820ACFNR

Overview

TLC0820ACFNR from Texas Instruments is an Advanced LinCMOS™ 8-bit analog-to-digital converter using modified flash architecture, featuring 1.18 µs conversion time, differential reference inputs (REF+ and REF–), parallel microprocessor interface with TTL-compatible 3-state outputs, and on-chip track-and-hold for continuous analog signals up to 100 mV/µs slew rate - deployed in high-speed data acquisition systems interfacing with 8-bit microcontrollers.

For engineers reviewing the TLC0820ACFNR datasheet, TLC0820ACFNR pinout, TLC0820ACFNR application, or TLC0820ACFNR equivalent, this page delivers verified technical context, real-world timing behavior across read/write-read modes, confirmed package mapping to PLCC-20 (FN), validated pin functions including WR/RDY dual-role terminal and OFLW overflow flag, and direct alternatives with documented functional alignment and interface compatibility.

Technical Context

The TLC0820ACFNR implements a two-stage modified flash architecture: first, a 4-bit flash ADC quantizes the MSBs; then a precision 4-bit DAC generates a reconstructed analog voltage, whose difference from the input is measured by a second 4-bit flash ADC for LSBs. This enables full 8-bit resolution without external clocking or oscillator components.

It supports two distinct operational modes selected via MODE pin: Read Mode (MODE low) initiates conversion on RD falling edge with WR/RDY acting as ready output; Write-Read Mode (MODE high) starts conversion on WR/RDY falling edge and uses INT to signal completion after ~800 ns delay. Both modes support TTL-level parallel bus interfacing with CS, RD, and WR/RDY control logic.

Key Specifications

Pinout & Package

Package: PLCC-20 (FN), plastic leaded chip carrier, 0.95 mm lead pitch, 8.3 mm × 8.3 mm body, 4.57 mm max height, pin 1 marked by corner notch or index area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parallel ADC applications.

Compared with ADC0820CCN and AD7820KN, the TLC0820ACFNR provides identical functionality in an actively produced RoHS-compliant PLCC-20 package, adds OFLW for overrange detection, and supports fully differential reference configuration - making it the preferred choice for new designs and legacy upgrades requiring long-term supply assurance.

Availability

TLC0820ACFNR is available at Aetrix Electronics and suitable for industrial data acquisition, test equipment development, and embedded control systems requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for TLC0820ACFNR 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 high-reliability ICs, with decades of expertise in precision data converters and industrial-grade components.

The TLC0820ACFNR belongs to TI's legacy LinCMOS™ precision ADC family, designed specifically for cost-sensitive, high-speed 8-bit parallel data acquisition in industrial and instrumentation applications where integration, timing predictability, and microprocessor compatibility are critical.

FAQ

What is the maximum analog input slew rate supported by the TLC0820ACFNR?

The TLC0820ACFNR incorporates an on-chip track-and-hold circuit with a 100 ns sample window, enabling accurate conversion of analog signals with slew rates up to 100 mV/µs without external components. This specification is confirmed in the "Principles of Operation" section of the SLAS064A datasheet and validated under recommended operating conditions with VCC = 5 V and TA = 25°C.

Does the TLC0820ACFNR require an external clock or oscillator?

No, the TLC0820ACFNR does not require an external clock or oscillator. Its modified flash architecture is self-timed, with internal logic controlling conversion sequencing. The device operates solely from its +5 V supply and digital control signals (CS, RD, WR/RDY, MODE), eliminating clock generation circuitry and associated jitter or layout sensitivity.

What is the function of the OFLW pin on the TLC0820ACFNR?

The OFLW (overflow) pin on the TLC0820ACFNR is an active-low output that asserts when the analog input exceeds the REF+ voltage. It serves two purposes: (1) signaling overrange conditions during single-device operation, and (2) enabling cascaded configurations with additional TLC0820ACFNR units to achieve 9-bit or 10-bit resolution, as illustrated in Figure 6 of the SLAS064A datasheet.

Which package type does the TLC0820ACFNR use, and is it RoHS compliant?

The TLC0820ACFNR uses the PLCC-20 (FN) package - a 20-pin plastic leaded chip carrier with J-leads, 0.95 mm pitch, and 8.3 mm × 8.3 mm body. Per TI's Package Option Addendum (15-Jul-2026), the TLC0820ACFN variant (identical to TLC0820ACFNR in form, fit, and function) is marked "Obsolete", but TLC0820ACFNR remains RoHS-compliant with NIPDAU lead finish and Level-1 MSL rating.

How does the MODE pin affect timing behavior of the TLC0820ACFNR?

The MODE pin selects between two distinct timing architectures: when MODE is low, the device enters Read Mode - conversion starts on RD falling edge and completes within 2.5 µs max; when MODE is high, it enters Write-Read Mode - conversion starts on WR/RDY falling edge and INT asserts ~800 ns later. These behaviors are defined in Figures 1–4 and the "Operating Characteristics" table of SLAS064A.