PIC17C4X
Applicable Devices 42 R42 42A 43 R43 44
FIGURE 19-3: CLKOUT AND I/O TIMING
Q1
Q2
Q3
Q4
OSC1
11
10
22
23
OSC2 †
13
12
18
16
14
19
I/O Pin
(input)
15
17
I/O Pin
new value
old value
(output)
20, 21
† In EC and RC modes only.
TABLE 19-3: CLKOUT AND I/O TIMING REQUIREMENTS
Parameter
No.
Sym
Characteristic
Min
Typ†
Max
Units Conditions
10
11
12
13
14
TosH2ckL OSC1↓ to CLKOUT↓
TosH2ckH OSC1↓ to CLKOUT↑
—
—
—
—
—
15 ‡
15 ‡
5 ‡
30 ‡
30 ‡
15 ‡
15 ‡
ns
ns
ns
ns
ns
Note 1
Note 1
Note 1
Note 1
Note 1
TckR
TckF
CLKOUT rise time
CLKOUT fall time
5 ‡
TckH2ioV CLKOUT ↑ to Port PIC17CR42/42A/43/
—
0.5TCY + 20 ‡
out valid
R43/44
PIC17LCR42/42A/43/
R43/44
—
—
—
—
0.5TCY + 50 ‡
ns
ns
ns
Note 1
Note 1
Note 1
Note 1
15
TioV2ckH Port in valid before PIC17CR42/42A/43/
CLKOUT↑ R43/44
0.25TCY + 25 ‡
—
—
PIC17LCR42/42A/43/ 0.25TCY + 50 ‡
R43/44
16
17
18
TckH2ioI
Port in hold after CLKOUT↑
0 ‡
—
—
—
—
—
100 ‡
—
ns
ns
ns
TosH2ioV OSC1↓ (Q1 cycle) to Port out valid
TosH2ioI
OSC1↓ (Q2 cycle) to Port input invalid
0 ‡
(I/O in hold time)
19
TioV2osH Port input valid to OSC1↓
30 ‡
—
—
ns
(I/O in setup time)
20
21
22
23
TioR
Port output rise time
—
—
10 ‡
10 ‡
—
35 ‡
35 ‡
—
ns
ns
ns
ns
TioF
Port output fall time
TinHL
TrbHL
INT pin high or low time
RB7:RB0 change INT high or low time
25 *
25 *
—
—
*
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.
1996 Microchip Technology Inc.
DS30412C-page 185
MICROCHIP [ MICROCHIP ]
