M68HC16 Z SERIES
ELECTRICAL CHARACTERISTICS
MOTOROLA
USER’S MANUAL
A-23
Table A-17 20.97-MHz AC Timing
(V
DD
and V
DDSYN
= 5.0 Vdc
± 5%, V
SS
= 0 Vdc, T
A
= T
L
to T
H)
1
Num
Characteristic
Symbol
Min
Max
Unit
F1
Frequency of Operation
f
—
20.97
MHz
1
Clock Period
tcyc
47.7
—
ns
1A
ECLK Period
tEcyc
381
—
ns
1B
External Clock Input Period
2tXcyc
47.7
—
ns
2, 3
tCW
18.8
—
ns
2A, 3A
ECLK Pulse Width
tECW
183
—
ns
2B, 3B
External Clock Input High/Low Time
2tXCHL
23.8
—
ns
4, 5
CLKOUT Rise and Fall Time
tCrf
—5
ns
4A, 5A
Rise and Fall Time (All Outputs except CLKOUT)
trf
—8
ns
4B, 5B
External Clock Input Rise and Fall
Time3tXCrf
—5
ns
6
Clock High to ADDR, FC, SIZE Valid4
tCHAV
023
ns
7
Clock High to ADDR, Data, FC, SIZE, High Impedance
tCHAZx
047
ns
8
Clock High to ADDR, FC, SIZE, Invalid
tCHAZn
0—
ns
9
Clock Low to AS, DS, CS Asserted4
tCLSA
023
ns
9A
AS to DS or CS Asserted (Read)5
tSTSA
-10
10
ns
11
ADDR, FC, SIZE Valid to AS, CS, (and DS Read) Asserted
tAVSA
10
—
ns
12
Clock Low to AS, DS, CS Negated
tCLSN
223
ns
13
AS, DS, CS Negated to ADDR, FC SIZE Invalid (Address Hold)
tSNAI
10
—
ns
14
AS, CS (and DS Read) Width Asserted
tSWA
80
—
ns
14A
DS, CS Width Asserted (Write)
tSWAW
36
—
ns
14B
AS, CS (and DS Read) Width Asserted (Fast Cycle)
tSWDW
32
—
ns
15
AS, DS, CS Width Negated
6tSN
32
—
ns
16
Clock High to AS, DS, R/W High Impedance
tCHSZ
—47
ns
17
AS, DS, CS Negated to R/W High
tSNRN
10
—
ns
18
Clock High to R/W High
tCHRH
023
ns
20
Clock High to R/W Low
tCHRL
023
ns
21
R/W High to AS, CS Asserted
tRAAA
10
—
ns
22
R/W Low to DS, CS Asserted (Write)
tRASA
54
—
ns
23
Clock High to Data Out Valid
tCHDO
—23
ns
24
Data Out Valid to Negating Edge of AS, CS (Fast Write Cycle)
tDVASN
10
—
ns
25
DS, CS Negated to Data Out Invalid (Data Out Hold)
tSNDOI
10
—
ns
26
Data Out Valid to DS, CS Asserted (Write)
tDVSA
10
—
ns
27
Data In Valid to Clock Low (Data Setup)
4tDICL
5—
ns
27A
Late BERR, HALT Asserted to Clock Low (Setup Time)
tBELCL
15
—
ns
28
AS, DS Negated to DSACK[1:0], BERR, HALT, AVEC Negated
tSNDN
060
ns
29
DS, CS Negated to Data In Invalid (Data In Hold)7
tSNDI
0—
ns
29A
DS, CS Negated to Data In High Impedance
7, 8tSHDI
—48
ns