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TMS370C742A Datasheet(PDF) 4 Page - Texas Instruments |
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TMS370C742A Datasheet(HTML) 4 Page - Texas Instruments |
4 / 66 page 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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