PIC17C4X Datasheet, PDF (185/240 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

PIC17C4X
FIGURE 19-3: CLKOUT AND I/O TIMING
Applicable Devices 42 R42 42A 43 R43 44
Q4
Q1
Q2
Q3
OSC1
OSC2 †
I/O Pin
(input)
I/O Pin
(output)
old value
† In EC and RC modes only.
10
13
14 ₁₉
22
23
18
17
15
20, 21
11
12
16
new value
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 PIC17CR42/42A/43/
out valid
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 PIC17CR42/42A/43/ 0.25TCY + 25 ‡ —
—
ns
Note 1
CLKOUT↑
R43/44
PIC17LCR42/42A/43/ 0.25TCY + 50 ‡ —
—
ns
Note 1
R43/44
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
*
†
‡
Note 1:
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.
Measurements are taken in EC Mode where CLKOUT output is 4 x TOSC.
© 1996 Microchip Technology Inc.
DS30412C-page 185