參數(shù)資料
型號: DS87C530
廠商: Maxim Integrated Products, Inc.
英文描述: EPROM/ROM Micro with Real Time Clock(帶實時時鐘的EPROM/ROM高速微控制器)
中文描述: EPROM微控制器,帶有實時時鐘
文件頁數(shù): 29/41頁
文件大?。?/td> 437K
代理商: DS87C530
DS87C530/DS83C530
070898 29/41
AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
33 MHz
VARIABLE CLOCK
UNITS
MIN
MAX
MIN
MAX
Oscillator Freq. (Ext. Osc.)
(Ext. Crystal)
1/t
CLCL
0
1
33
33
0
1
33
33
MHz
ALE Pulse Width
t
LHLL
40
1.5t
CLCL
–5
ns
Port 0 Address Valid to ALE Low
t
AVLL
10
0.5t
CLCL
–5
ns
Address Hold after ALE Low
t
LLAX1
10
0.5t
CLCL
–5
ns
ALE Low to Valid Instruction In
t
LLIV
56
2.5t
CLCL
–20
ns
ALE Low to PSEN Low
t
LLPL
10
0.5t
CLCL
–5
ns
PSEN Pulse Width
t
PLPH
55
2t
CLCL
– 5
ns
PSEN Low to Valid Instr. In
t
PLIV
41
2t
CLCL
–20
ns
Input Instruction Hold after PSEN
t
PXIX
0
0
ns
Input Instruction Float after PSEN
t
PXIZ
26
t
CLCL
–5
ns
Port 0 Address to Valid Instr. In
t
AVIV
71
3t
CLCL
–20
ns
Port 2 Address to Valid Instr. In
t
AVIV2
81
3.5t
CLCL
–25
ns
PSEN Low to Address Float
t
PLAZ
0
0
ns
NOTES FOR AC ELECTRICAL CHARACTERISTICS:
All parameters apply to both commercial and industrial temperature range operation unless otherwise noted. All sig-
nals rated over operating temperature. All signals characterized with load capacitance of 80 pF except Port 0, ALE,
PSEN, RD and WR with 100 pF. Interfacing to memory devices with float times (turn off times) over 25 ns may cause
contention. This will not damage the parts, but will cause an increase in operating current. Specifications assume a
50% duty cycle for the oscillator. Port 2 and ALE timing will change in relation to duty cycle variation.
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