参数资料
型号: SST89E554A-40-C-NJ
厂商: SILICON STORAGE TECHNOLOGY INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, MS-018AC, LCC-44
文件页数: 69/87页
文件大小: 996K
代理商: SST89E554A-40-C-NJ
Preliminary Specifications
FlashFlex51 MCU
SST89E554A / SST89V554A
71
2003 Silicon Storage Technology, Inc.
S71228-00-000
6/03
2. Capacitive loading on Ports 0 & 2 may cause spurious noise to be superimposed on the VOLs of ALE and Ports 1 & 3. The noise due
to external bus capacitance discharging into the Port 0 & 2 pins when the pins make 1-to-0 transitions during bus operations. In the
worst cases (capacitive loading > 100pF), the noise pulse on the ALE pin may exceed 0.8V. In such cases, it may be desirable to
qualify ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input.
3. Load capacitance for Port 0, ALE & PSEN#= 100pF, load capacitance for all other outputs = 80pF.
4. Capacitive loading on Ports 0 & 2 may cause the VOH on ALE and PSEN# to momentarily fall below the VDD - 0.7 specification when
the address bits are stabilizing.
5. Pins of Ports 1, 2 & 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its
maximum value when VIN is approximately 2V.
6. Pin capacitance is characterized but not tested. EA# is 25pF (max).
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