83C51KB Datasheet, PDF (16/19 Pages) Intel Corporation – HIGH PERFORMANCE KEYBOARD MICROCONTROLLER

83C51KB HIGH PERFORMANCE KEYBOARD MICROCONTROLLER
6.2 A.C. Characteristics
Symbol
Table 8. A.C. Characteristics (Note 1, 2)
Parameter
Min
Max
F_OSC
T_OSC
T_LHLL
RCIN Frequency
1/Fosc
ALE Pulse Width
4
6
166.7
250
2Tosc - 50
T_AVLL
T_LLAX
Address Valid to ALE Low
Address Hold after ALE Low
Tosc - 50
Tosc - 40
T_LLIV
ALE Low to Valid Instruction In
4Tosc - 80
T_LLPL
T_PLPH
ALE Low to PSEN# Low
Psen# Pulse Width
Tosc - 40
3Tosc - 60
T_PLIV
T_PXIX
Psen# Low to Valid Instruction In
Input Instruction Hold after PSEN#
3Tosc - 90
0
T_PXIZ
Input Instruction Float after PSEN#
Tosc - 20
T_AVIV
Address Valid to Valid Instruction In
5Tosc - 90
T_PLAZ
Psen# Low to Address Float
20
T_RLRH
RD# Pulse Width
6Tosc - 120
T_WLWH
Write# Pulse Width
6Tosc - 120
T_RLDV
RD# Low to Valid Data In
5Tosc - 150
T_RHDX
Input Data Hold after RD# High
0
T_RHDZ
Input Data Float after RD# High
2Tosc - 45
T_LLDV
ALE Low to Valid Data In
8Tosc - 130
T_AVDV
Address Valid to Valid Data In
9Tosc - 145
T_LLWL
ALE Low to RD# or WR# Low
3Tosc - 70
3Tosc + 70
T_AVWL
Address Valid to WR# Low
4Tosc - 150
T_QVWX
Output Data Valid before WR#
Tosc - 70
T_QVWH
Output Data Valid to WR# High
7Tosc - 170
T_WHQX
Output Data Hold after WR# High
Tosc - 60
T_RLAZ
RD# Low to Address Float
0
T_WHLH
RD# or WR# High to ALE High
Tosc - 55
Tosc + 40
T_POR
Power on reset internal high time (note 3)
80
260
NOTE:
1. Capacitive loading=100pF
2. Rise time and fall time = 20ns for external clock drive
3. T_POR timing begins when the voltage exceeds the V_POR crossover voltage.
Unit
MHz
ns
·ns
·ns
·ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
16