TMS370 datasheet(4/66 Pages) TI

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TMS370Cx4x

8-BIT MICROCONTROLLER

SPNS016C – NOVEMBER 1992 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

description (continued)

D One 24-bit general-purpose watchdog timer

Table 1 provides an overview of the various memory configurations of the TMS370Cx4x devices.

Table 1. Memory Configurations

DEVICE

PROGRAM MEMORY (BYTES)

DATA MEMORY (BYTES)

PACKAGES

44 PIN/PLCC/CLCC OR

DEVICE

ROM

EPROM

RAM

EEPROM

44 PIN/PLCC/CLCC OR

40 PIN PDIP/CDIP/PSDIP/CSDIP

TMS370C040A

—

256

FN-PLCC

N-PDIP

NJ-PSDIP†

TMS370C042A

—

256

FN-PLCC

N-PDIP

NJ-PSDIP†

TMS370C340A

—

256

—

FN-PLCC

N-PDIP

NJ-PSDIP†

TMS370C342A

—

256

—

FN-PLCC

N-PDIP

NJ-PSDIP†

TMS370C742A

—

256

FN-PLCC

N-PDIP

NJ-PSDIP†

SE370C742A‡

—

256

FZ-CLCC

JD-CDIP

JC-CSDIP

† The NJ designator for the 40-pin plastic shrink DIP package was known formerly as the N2. The mechanical drawing of the NJ is identical to the

N2 package and did not need to be requalified.

‡ System evaluators and development tools are for use only in a prototype environment, and their reliability has not been characterized.

The suffix letter (A) appended to the device name (shown in the first column of Table 1) indicates the

configuration of the device. ROM and EPROM devices have different configurations as indicated in Table 2.

ROM devices with the suffix letter A are configured through a programmable contact during manufacture.

Table 2. Suffix Letter Configuration

DEVICE

WATCHDOG TIMER

CLOCK

LOW-POWER MODE

EPROM A

Standard

Divide-by-4 (standard oscillator)

Enabled

Standard

Di id b 4 ( t

d d

ill t )

ROM A

Hard

Divide-by-4 (standard oscillator)

or Divide-by-1 (PLL)

Enabled or disabled

Simple

or Divide-by-1 (PLL)

The 4K bytes and 8K bytes of mask-programmable ROM in the TMS370C040A, TMS370C042A,

TMS370C340A and TMS370C342A are replaced in the TMS370C742 with 8K bytes of EPROM while all other

available memory and on-chip peripherals are identical, with the exception of no data EEPROM on the

TMS370C340A and TMS370C342A devices. The OTP (TMS370C742A) device and the reprogrammable

device (SE370C742A) are available.

TMS370C742A (OTP) devices are available in plastic packages. This microcontroller is effective to use for

immediate production updates for other members of the TMS370Cx4x family or for low-volume production runs

when the mask charge or cycle time for the low-cost mask ROM devices is not practical.

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