Texas Instruments TMS370C742ANT

Overview

TMS370C742ANT from Texas Instruments is an 8-bit OTP microcontroller with 8 KB EPROM program memory, 256-byte RAM, 256-byte data EEPROM, and integrated peripherals including dual 16-bit timers, SCI1 serial interface, 4-channel 8-bit ADC1, and 24-bit watchdog timer - used in automotive sensor interfaces and industrial motor control systems.

For engineers reviewing the TMS370C742ANT datasheet, TMS370C742ANT pinout, TMS370C742ANT application, or TMS370C742ANT equivalent, key selection considerations include its 40-pin PDIP package, 5 V ±10% supply, STANDBY/HALT low-power modes, PLL/divide-by-4 clock options, and OTP programmability for low-volume production.

Technical Context

The TMS370C742ANT implements a register-to-register CPU architecture eliminating accumulator bottlenecks, supporting direct arithmetic between any two of 256 general-purpose registers. Its memory map unifies program and data space (Von Neumann), with peripheral registers mapped at 1010h–107Fh and reset vector at 7FFEh/7FFFh.

Peripheral control uses memory-mapped I/O: Timer 1 (1040h–104Fh), SCI1 (1050h–105Fh), ADC1 (1070h–107Fh), and system control (1010h–101Fh). The device supports asynchronous or isosynchronous SCI communication, four ADC input channels (AN2, AN3, AN6, AN7), and software-configurable timer functions including PWM, input capture, and event counting.

Key Specifications

Pinout & Package

40-pin plastic dual-in-line package (PDIP, N package), with 27 bidirectional I/O pins and 5 dedicated input pins. Pin functions validated per TI SPNS016C datasheet (Rev. February 1997).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS370C742A, the TMS370C742ANT offers identical electrical and functional behavior but guarantees commercial-grade qualification and PDIP packaging compliance; versus SE370C742A, it trades reprogrammability for production reliability and cost efficiency in volume manufacturing.

Availability

TMS370C742ANT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial motor controllers, and consumer appliance control systems requiring stable component supply and long-term lifecycle support.

Supply support for TMS370C742ANT 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and digital signal processing technologies.

The TMS370Cx4x product line delivers cost-effective, single-chip 8-bit microcontrollers targeting real-time control in automotive, industrial, and consumer applications - emphasizing integration of memory, timers, ADC, and serial interfaces on one die.

FAQ

What is the memory configuration of the TMS370C742ANT?

The TMS370C742ANT contains 8 KB of one-time-programmable EPROM (6000h–7FFFh), 256 bytes of on-chip RAM (0000h–00FFh), 256 bytes of data EEPROM (1F00h–1FFFh), and no mask ROM. This configuration supports firmware storage, runtime variables, and nonvolatile parameter retention without external memory.

Does the TMS370C742ANT support in-circuit programming?

Yes, the TMS370C742ANT supports in-circuit EPROM programming when 13 V is applied to the MC pin and appropriate control sequences are executed via the EPCTL register (P01C). Data EEPROM programming requires 12 V on MC and uses the DEECTL register (P01A), both without removing the device from the board.

What are the low-power modes supported by the TMS370C742ANT?

The TMS370C742ANT supports STANDBY mode (CPU halted, oscillator and Timer 1 active) and HALT mode (all clocks stopped, only RESET and external interrupts wake the device). Both modes retain RAM contents and peripheral register settings, enabling fast resume in battery-powered applications.

How many analog input channels does the TMS370C742ANT ADC1 have?

The TMS370C742ANT features a 4-channel 8-bit ADC1 with inputs on AN2, AN3, AN6, and AN7 - consistent with its 40-pin PDIP package. The ADC provides 33 µs conversion time at 5 MHz SYSCLK and supports selectable reference voltages via VCC3/VSS3 pins.

What clock options are available for the TMS370C742ANT?

The TMS370C742ANT supports three clock configurations: divide-by-4 (0.5–5 MHz SYSCLK), divide-by-1 with PLL (2–5 MHz SYSCLK), and external clock input via XTAL2/CLKIN. The PLL option enables higher internal clock rates while maintaining stable crystal-based timing accuracy.