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TMS370C742A Datasheet(PDF) 4 Page - Texas Instruments

Part # TMS370C742A
Description  8-BIT MICROCONTROLLER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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TMS370C742A Datasheet(HTML) 4 Page - Texas Instruments

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TMS370Cx4x
8-BIT MICROCONTROLLER
SPNS016C – NOVEMBER 1992 – REVISED FEBRUARY 1997
4
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
4K
256
256
FN-PLCC
N-PDIP
NJ-PSDIP†
TMS370C042A
8K
256
256
FN-PLCC
N-PDIP
NJ-PSDIP†
TMS370C340A
4K
256
FN-PLCC
N-PDIP
NJ-PSDIP†
TMS370C342A
8K
256
FN-PLCC
N-PDIP
NJ-PSDIP†
TMS370C742A
8K
256
256
FN-PLCC
N-PDIP
NJ-PSDIP†
SE370C742A‡
8K
256
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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