Switching Characteristics over Commercial and Industrial Operating Ranges
Clock (40 MHz and 50 MHz)
Preliminary
Parameter
40 MHz
Min
50 MHz
Min
No.
Symbol Description
Max
Max
Unit
CLKIN Requirements for Times Four Mode
tCKIN
36
37
38
39
40
X1 Period(a)
100
45
125
80
35
35
125
ns
ns
ns
ns
ns
X1 Low Time (1.5 V)(a)
X1 High Time (1.5 V)(a)
X1 Fall Time (3.5 to 1.0 V)(a)
X1 Rise Time (1.0 to 3.5 V)(a)
tCLCK
tCHCK
tCKHL
tCKLH
45
5
5
5
5
CLKIN Requirements for Times One Mode
tCKIN
tCLCK
tCHCK
tCKHL
tCKLH
36
37
38
39
40
X1 Period(a)
25
7.5
7.5
60
ns
ns
ns
ns
ns
X1 Low Time (1.5 V)(a)
X1 High Time (1.5 V)(a)
X1 Fall Time (3.5 to 1.0 V)(a)
X1 Rise Time (1.0 to 3.5 V)(a)
Not Supported
5
5
CLKIN Requirements for Divide by Two Mode
tCKIN
tCLCK
tCHCK
tCKHL
tCKLH
36
37
38
39
40
X1 Period(a)
12.5
1.25
1.25
33
ns
ns
ns
ns
ns
X1 Low Time (1.5 V)(a)
X1 High Time (1.5 V)(a)
X1 Fall Time (3.5 to 1.0 V)(a)
X1 Rise Time (1.0 to 3.5 V)(a)
Not Supported
5
5
CLKOUT Timing
tCLCL
tCLCH
42
43
CLKOUTA Period
25
20
0.5tCLCL–1=9
0.5tCLCL–1=9
ns
ns
ns
ns
ns
ms
ns
ns
0.5tCLCL–1.25=11.25
0.5tCLCL–1.25=11.25
CLKOUTA Low Time (CL=50 pF)
CLKOUTA High Time (CL=50 pF)
CLKOUTA Rise Time (1.0 to 3.5 V)
CLKOUTA Fall Time (3.5 to 1.0 V)
Maximum PLL Lock Time
X1 to CLKOUTA Skew
tCHCL
44
tCH1CH2
tCL2CL1
tLOCK
45
3
3
3
3
46
61
1
1
tCICOA
tCICOB
69
20
24
15
21
70
X1 to CLKOUTB Skew
Notes:
All timing parameters are measured at VCC/2 with 50 pF loading on CLKOUTA, unless otherwise noted. All
output test conditions are with CL=50 pF. For switching tests, VIL=0.3 V and VIH =VCC–0.3 V.
a
The Times One mode should be used for operations from 16 MHz to 20 MHz. The Times Four mode should
be used for operations above 20 MHz.
94
Am186TMER and Am188TMER Microcontrollers Data Sheet