TSC87C52
AC Parameters
Explanation of the AC Symbols
Each timing symbol has 5 characters. The first character is always a “T” (stands for time). The other characters,
depending on their positions, stand for the name of a signal or the logical status of that signal. The following is a list
of all the characters and what they stand for.
Example:
TAVLL = Time for Address Valid to ALE Low.
TLLPL = Time for ALE Low to PSEN Low.
TA = 0 to +70_C; VSS = 0V VCC = 5V±10%; 0 to 12MHz
TA = –40°C to +85°C; VSS = 0V; VCC = 5V ± 10%; F = 0 to 12MHz.
(Load Capacitance for PORT 0, ALE and PSEN = 100pf; Load Capacitance for all other outputs = 80 pF.)
External Program Memory Characteristics
0 to 12MHz
Symbol
Parameter
Units
Min
Max
TLHLL
TAVLL
TLLAX
TLLIV
TLLPL
TPLPH
TPLIV
TPXIX
TPXIZ
TPXAV
TAVIV
TPXAV
ALE pulse width
2TCLCL – 40
TCLCL – 40
TCLCL – 30
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Address Valid to ALE
Address Hold After ALE
ALE to Valid Instruction In
ALE to PSEN
4TCLCL – 100
TCLCL – 30
3TCLCL – 45
PSEN Pulse Width
PSEN to Valid Instruction In
Input Instruction Hold After PSEN
Input Instruction FloatAfter PSEN
PSEN to Address Valid
3TCLCL – 105
TCLCL – 25
0
TCLCL – 8
Address to Valid Instruction In
PSEN Low to Address Float
5TCLCL – 105
10
External Program Memory Read Cycle
12 TCLCL
TLHLL
TLLIV
TLLPL
ALE
PSEN
TPLPH
TPXAV
TPXIZ
TLLAX
TAVLL
TPLIV
TPLAZ
TPXIX
INSTR IN
PORT 0
PORT 2
INSTR IN
A0–A7
A0–A7
INSTR IN
TAVIV
ADDRESS
OR SFR–P2
ADDRESS A8–A15
ADDRESS A8–A15
MATRA MHS
Rev. C – 10 Sept 1997
18
Preliminary
TEMIC [ TEMIC SEMICONDUCTORS ]
