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© 2000 Silicon Storage Technology, Inc.

344-2 8/00

FlashFlex51 MCU

SST89C54 / SST89C58

Preliminary Specifications

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SERIAL I/O (UART) .............................................................................................................................................. 31

WATCHDOG TIMER ............................................................................................................................................ 32

SECURITY LOCK ................................................................................................................................................ 32

Hard Lock ................................................................................................................................................. 32

SoftLock ................................................................................................................................................... 32

Status of the Security Lock ........................................................................................................................... 33

RESET ................................................................................................................................................................ 34

Power-On Reset ........................................................................................................................................... 34

POWER-SAVING MODES ................................................................................................................................... 35

CLOCK INPUT OPTIONS .................................................................................................................................... 37

ELECTRICAL SPECIFICATION ........................................................................................................................... 38

Absolute Maximum Ratings .......................................................................................................................... 38

Operation Range ........................................................................................................................................... 38

Reliability Characteristics .............................................................................................................................. 38

DC Electrical Characteristics ......................................................................................................................... 39

AC Electrical Characteristics ......................................................................................................................... 42

Explanation Of Symbols .......................................................................................................................... 43

External Clock Drive ................................................................................................................................ 44

Serial Port Timing - Shift Register Mode .................................................................................................. 45

PRODUCT ORDERING INFORMATION ............................................................................................................. 46

Part Number Valid Combinations .................................................................................................................. 46

PART NUMBER CROSS REFERENCE GUIDE .................................................................................................. 47

PACKAGING DIAGRAMS .................................................................................................................................... 48