參數(shù)資料
型號: DS87C530-QNL
英文描述: EPROM MICRO WITH REAL TIME CLOCK
中文描述: 微型存儲器與實時時鐘
文件頁數(shù): 28/40頁
文件大小: 435K
代理商: DS87C530-QNL
DS87C530
022197 28/40
AC ELECTRICAL CHARACTERISTICS
(0
°
C to 70
°
C; V
CC
=4.0V to 5.5V)
VARIABLE CLOCK
PARAMETER
SYMBOL
33 MHz
UNITS
MIN
MAX
MIN
MAX
Oscillator Frequency
1/t
CLCL
0
33
0
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.
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