
1996 Microchip Technology Inc.
DS30412C-page 185
PIC17C4X
Applicable Devices 42 R42 42A 43 R43 44
FIGURE 19-3: CLKOUT AND I/O TIMING
TABLE 19-3:
CLKOUT AND I/O TIMING REQUIREMENTS
Parameter
No.
Sym
Characteristic
Min
Typ
Max
Units Conditions
10
TosH2ckL
OSC1
↓ to CLKOUT↓
—
15
30
ns
Note 1
11
TosH2ckH
OSC1
↓ to CLKOUT↑
—
15
30
ns
Note 1
12
TckR
CLKOUT rise time
—
5
15
ns
Note 1
13
TckF
CLKOUT fall time
—
5
15
ns
Note 1
14
TckH2ioV
CLKOUT
↑ to Port
out valid
PIC17CR42/42A/43/
R43/44
—
0.5TCY + 20
ns
Note 1
PIC17LCR42/42A/43/
R43/44
—
0.5TCY + 50
ns
Note 1
15
TioV2ckH
Port in valid before
CLKOUT
↑
PIC17CR42/42A/43/
R43/44
0.25TCY + 25
—
ns
Note 1
PIC17LCR42/42A/43/
R43/44
0.25TCY + 50
—
ns
Note 1
16
TckH2ioI
Port in hold after CLKOUT
↑
0
—
ns
Note 1
17
TosH2ioV
OSC1
↓ (Q1 cycle) to Port out valid
—
100
ns
18
TosH2ioI
OSC1
↓ (Q2 cycle) to Port input invalid
(I/O in hold time)
0
—
ns
19
TioV2osH
Port input valid to OSC1
↓
(I/O in setup time)
30
—
ns
20
TioR
Port output rise time
—
10
35
ns
21
TioF
Port output fall time
—
10
35
ns
22
TinHL
INT pin high or low time
25 *
—
ns
23
TrbHL
RB7:RB0 change INT high or low time
25 *
—
ns
*
These parameters are characterized but not tested.
Data in “Typ” column is at 5V, 25
°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
These parameters are for design guidance only and are not tested, nor characterized.
Note 1:
Measurements are taken in EC Mode where CLKOUT output is 4 x TOSC.
OSC1
OSC2
I/O Pin
(input)
I/O Pin
(output)
Q4
Q1
Q2
Q3
10
13
14
17
20, 21
22
23
19
18
15
11
12
16
old value
new value
In EC and RC modes only.