Rainbow Electronics T89C51AC2 - Manual (Page 98)

98
T89C51AC2
Rev. B – 19-Dec-01
18.4.2 External Program
Memory Characteristics
Table 59. Symbol Description
Table 60. AC Parameters for a Fix Clock (F= 40 MHz)
Symbol Parameter
T Oscillator clock period
T
LHLL
ALE pulse width
T
AVLL
Address Valid to ALE
T
LLAX
Address Hold After ALE
T
LLIV
ALE to Valid Instruction In
T
LLPL
ALE to PSEN
T
PLPH
PSEN Pulse Width
T
PLIV
PSEN to Valid Instruction In
T
PXIX
Input Instruction Hold After PSEN
T
PXIZ
Input Instruction Float After PSEN
T
AVIV
Address to Valid Instruction In
T
PLAZ
PSEN Low to Address Float
Symbol
Min Max
Units
T 25 ns
T
LHLL
40 ns
T
AVLL
10 ns
T
LLAX
10 ns
T
LLIV
70 ns
T
LLPL
15 ns
T
PLPH
55 ns
T
PLIV
35 ns
T
PXIX
0 ns
T
PXIZ
18 ns
T
AVIV
85 ns
T
PLAZ
10 ns