Z86C21 Datasheet, PDF (21/35 Pages) Zilog, Inc. – 8K ROM Z8 CMOS MICROCONTROLLER

AC CHARACTERISTICS
External I/O or Memory Read or Write Timing Table
Z86C21 MCU
WITH 8K ROM
No Symbol
1 TdA(AS)
2 TdAS(A)
3 TdAS(DR)
4 TwAS
Parameter
Address Valid to /AS Rise Delay
/AS Rise to Address Float Delay
/AS Rise to Read Data Req’d Valid
/AS Low Width
T
A
=
0°C
to
+70°C
12 MHz 16 MHz
T
A
=
–40°C
to
+105°C
12 MHz 16 MHz
Min Max Min Max Min Max Min Max
35
25
35
25
45
35
45
35
250
180
250
180
55
40
55
40
Units
ns
ns
ns
ns
Notes
[2,3]
[2,3]
[1,2,3]
[2,3]
5 TdAZ(DS) Address Float to /DS Fall
6 TwDSR
/DS (Read) Low Width
7 TwDSW
/DS (Write) Low Width
8 TdDSR(DR) /DS Fall to Read Data Req’d Valid
0
0
0
0
185
135
185
135
110
80
110
80
130
75
130
75
ns
ns [1,2,3]
ns [1,2,3]
ns [1,2,3]
9 ThDR(DS) Read Data to /DS Rise Hold Time
10 TdDS(A) /DS Rise to Address Active Delay
11 TdDS(AS) /DS Rise to /AS Fall Delay
12 TdR/W(AS) R//W Valid to /AS Rise Delay
0
0
0
0
65
50
65
50
45
35
45
35
30
20
33
25
ns [2,3]
ns [2,3]
ns [2,3]
ns [2,3]
13 TdDS(R/W) /DS Rise to R//W Not Valid
50
35
50
35
ns [2,3]
14 TdDW(DSW) Write Data Valid to /DS Fall (Write) Delay 35
25
35
25
ns [2,3]
15 TdDS(DW) /DS Rise to Write Data Not Valid Delay
55
35
55
35
ns [2,3]
16 TdA(DR) Address Valid to Read Data Req’d Valid
310
230
310
230 ns [1,2,3]
17 TdAS(DS) /AS Rise to /DS Fall Delay
18 TdDM(AS) /DM Valid to /AS Rise Delay
65
45
65
45
50
30
50
30
ns [2,3]
ns [2,3]
Notes:
[1] When using extended memory timing add 2 TpC.
[2] Timing numbers given are for minimum TpC.
[3] See clock cycle dependent characteristics table.
Clock Dependent Formulas
Number
Symbol
Equation
Standard Test Load
1
All timing references use 2.0V for a logic 1 and 0.8V for a logic 0.
2
3
4
TdA(AS)
TdAS(A)
TdAS(DR)
TwAS
0.40TpC + 0.32
0.59TpC – 3.25
2.83TpC + 6.14
0.66TpC – 1.65
6
TwDSR
2.33TpC – 10.56
7
TwDSW
1.27TpC + 1.67
8
TdDSR(DR)
1.97TpC – 42.5
10
TdDS(A)
0.8TpC
11
TdDS(AS)
0.59TpC – 3.14
12
TdR/W(AS)
0.4TpC
13
TdDS(R/W)
0.8TpC – 15
14
TdDW(DSW)
0.4TpC
15
TdDS(DW)
0.88TpC – 19
16
TdA(DR)
4TpC –20
17
TdAS(DS)
0.91TpC –10.7
18
TdDM(AS)
0.9TpC – 26.3
21