PIC17C75X
FIGURE 20-3: CLKOUT AND I/O TIMING
Q1
Q2
Q3
Q4
OSC1
11
10
22
23
OSC2 †
13
12
16
18
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 20-3: CLKOUT AND I/O TIMING REQUIREMENTS
Param.
No.
Sym
Characteristic
Min
Typ†
Max
Units Conditions
10
11
12
13
14
TosL2ckL OSC1↓ to CLKOUT↓
TosL2ckH OSC1↓ to CLKOUT↑
—
—
—
—
—
—
15 ‡
15 ‡
5 ‡
5 ‡
—
30 ‡
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
30 ‡
TckR
TckF
CLKOUT rise time
CLKOUT fall time
15 ‡
15 ‡
TckH2ioV CLKOUT ↑ to Port PIC17CXXX
0.5TCY + 20 ‡
out valid
PIC17LCXXX
—
0.5TCY + 50 ‡
15
TioV2ckH Port in valid before PIC17CXXX
0.25TCY + 25 ‡
—
—
—
CLKOUT↑
PIC17LCXXX
0.25TCY + 50 ‡
—
16
17
18
TckH2ioI
TosL2ioV
TosL2ioI
Port in hold after CLKOUT↑
0 ‡
—
—
—
OSC1↓ (Q1 cycle) to Port out valid
—
100 ‡
—
OSC1↓ (Q2 cycle) to Port input invalid
0 ‡
—
(I/O in hold time)
19
TioV2osL 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.
1997 Microchip Technology Inc.
Preliminary
DS30264A-page 233
MICROCHIP [ MICROCHIP ]
