Texas Instruments TMS370C758BNMT

Overview

TMS370C758BNMT from Texas Instruments is an 8-bit OTP EPROM microcontroller with 32 KB on-chip program memory, 1 KB RAM, 256-byte data EEPROM, and integrated peripherals including an 8-channel 8-bit ADC, two 16-bit timers, SCI1 serial interface, SPI, and a 24-bit watchdog timer - used in automotive engine control units and industrial motor controllers.

For engineers reviewing the TMS370C758BNMT datasheet, TMS370C758BNMT pinout, TMS370C758BNMT application, or TMS370C758BNMT equivalent, key selection considerations include its 68-pin LCC package, PLL-based 1×/4× clock options, microcomputer/microprocessor dual-mode operation, and OTP programmability for low-volume production updates.

Technical Context

The TMS370C758BNMT implements a register-to-register architecture with no accumulator requirement, enabling direct arithmetic operations between any two registers. It supports four operating modes - microcomputer single-chip, microcomputer with external expansion, microprocessor without internal program memory, and microprocessor with internal program memory - selected via MC pin voltage and software configuration of system control registers.

Its external bus features non-multiplexed 16-bit address and 8-bit data lines, precoded chip-select outputs (CSE1/CSE2/CSH1–CSH3/CSPF), and WAIT-state support for timing flexibility with slow peripherals. All peripheral pins - including SCI1, SPI, ADC inputs, and timer I/O - are software-configurable as general-purpose digital I/O when not assigned to dedicated functions.

Key Specifications

Pinout & Package

Package: 68-pin plastic Leaded Chip Carrier (LCC), FN/FZ-style footprint, surface-mountable with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS370C758ANMT, the TMS370C758BNMT delivers higher SYSCLK (up to 5 MHz) via PLL for tighter control loop timing; versus SE370C758BNMT, it trades reprogrammability for production-grade plastic packaging and extended lifecycle assurance.

Availability

TMS370C758BNMT is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drive controllers, and telecom line card monitors requiring stable component supply across extended product lifecycles.

Supply support for TMS370C758BNMT 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 founded in 1930, specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and communications markets.

The TMS370Cx5x family was designed for cost-effective real-time control in resource-constrained environments - integrating OTP EPROM, ADC, timers, and serial interfaces into a single 8-bit MCU optimized for automotive and industrial applications.

FAQ

What memory types and capacities does the TMS370C758BNMT integrate on-chip?

The TMS370C758BNMT integrates 32 KB of one-time-programmable (OTP) EPROM for program storage, 1 KB of static RAM for runtime variables, and 256 bytes of data EEPROM for nonvolatile parameter storage such as calibration coefficients or fault logs. These memory resources are fixed per the '758 variant and do not require external expansion for typical motor control or sensor interface applications. The TMS370C758BNMT datasheet confirms this configuration in Table 2 under the 'TMS370Cx58' sub-family.

How does the TMS370C758BNMT support external memory expansion?

The TMS370C758BNMT supports external memory expansion through a non-multiplexed 16-bit address bus (Ports B and C) and 8-bit data bus (Port A), with software-configurable control signals including CSE1, CSE2, CSH1–CSH3, CSPF, and WAIT. Function A enables mapping up to 112 KB of external memory using precoded chip selects, while Function B supports up to 40 KB using EDS. This architecture eliminates external address latches and minimizes decode logic. The TMS370C758BNMT pinout document specifies these signals on pins D7, D0, D6, D2, D1, and D5 respectively.

What are the clocking options supported by the TMS370C758BNMT?

The TMS370C758BNMT supports two clocking modes: a PLL-based divide-by-1 option delivering SYSCLK at 2–5 MHz directly from XTAL2/CLKIN, and a crystal-based divide-by-4 option yielding SYSCLK at 0.5–5 MHz. The mode is selected by the suffix letter - 'B' in TMS370C758BNMT denotes hard watchdog and PLL-enabled operation. External clock sources up to 5 MHz may be applied to XTAL2/CLKIN, and the internal oscillator remains functional across the full industrial temperature range (–40°C to +85°C).

Can the TMS370C758BNMT operate in low-power modes, and how are they configured?

Yes, the TMS370C758BNMT supports two hardware-controlled low-power modes: STANDBY (oscillator and timers remain active) and HALT (all clocks stopped). Both modes preserve RAM contents and peripheral register states. Entry is triggered by software instruction (STOP or HALT), and exit occurs on RESET or enabled interrupt. The TMS370C758BNMT's STANDBY mode draws <500 µA at 5 V, making it suitable for battery-backed diagnostic tools. Configuration is handled entirely in firmware without external components.

What distinguishes the TMS370C758BNMT from the SE370C758BNMT variant?

The TMS370C758BNMT uses a plastic Leaded Chip Carrier (LCC) package rated for production use, while the SE370C758BNMT uses a windowed ceramic LCC package enabling UV-erasable reprogramming during development. Both share identical OTP EPROM content, RAM, and peripheral sets, but the SE370C758BNMT is explicitly designated for prototyping only - its reliability is not characterized for volume deployment. The TMS370C758BNMT is the recommended part for final designs requiring long-term supply stability and automotive qualification.