参数资料
型号: DS80C390-FNR
厂商: DALLAS SEMICONDUCTOR
元件分类: Microcontroller
英文描述: 8-BIT, 40 MHz, MICROCONTROLLER, PQFP64
封装: LQFP-64
文件页数: 38/58页
文件大小: 5486K
代理商: DS80C390-FNR
DS80C390
43 of 58
110199
MULTIPLEXED 9 CYCLE DATA MEMORY
3
-
CE0
WRITE
ELECTRICAL CHARACTERISTICS (Non-multiplexed address/data bus)
40 MHz
VARIABLE CLOCK
PARAMETER
SYMBOL MIN MAX
MIN
MAX
UNITS
Oscillator Freq.
(Ext. Osc)
1 / tCLCL
0
40
0
40
MHz
(Ext. Crystal)
1
40
1
40
PSEN
Pulse Width
tPLPH
0.5 tMCS - 5
ns
PSEN
Low to Valid Instruction In
tPLIV
0.5 tMCS - 20
ns
Input Instruction Hold after PSEN
tPXIX
0
ns
Input Instruction Float after PSEN
tPXIZ
See MOVX
characteristics
ns
Port 1 Address, Port 4 CE to
Valid Instruction In
tAVIV1
0.75 tMCS - 20
ns
Port 2, 4 Address to Valid
Instruction In
tAVIV2
0.875 tMCS - 25
ns
NOTES FOR AC ELECTRICAL CHARACTERISTICS:
1. All parameters apply to both commercial and industrial temperature operation unless otherwise noted.
2. The value tMCS is a function of the machine cycle clock in terms of the processor’s input clock
frequency. These relationships are described in the “Stretch Value Timing” table.
3. All signals characterized with load capacitance of 80 pF except Port 0, ALE, PSEN , RD and WR
with 100 pF.
4. Interfacing to memory devices with float times (turn off times) over 25 ns may cause bus contention.
This will not damage the parts, but will cause an increase in operating current.
5. Specifications assume a 50% duty cycle for the oscillator. Port 2 timing will change in relation to
duty cycle variation.
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相关代理商/技术参数
参数描述
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