Datasheet

 2011 Microchip Technology Inc. DS39960D-page 507
PIC18F87K22 FAMILY
FIGURE 31-7: PROGRAM MEMORY READ TIMING DIAGRAM
TABLE 31-11: CLKO AND I/O TIMING REQUIREMENTS
Param.
No
Symbol Characteristics Min Typ Max Units
150 TadV2alL Address Out Valid to ALE 
(address setup time)
0.25 T
CY – 10 — — ns
151 TalL2adl ALE
 to Address Out Invalid
(address hold time)
5——ns
155 TalL2oeL ALE
 to OE  10 0.125 TCY —ns
160 TadZ2oeL AD High-Z to OE
(bus release to OE)0——ns
161 ToeH2adD OE
 to AD Driven 0.125 TCY – 5 — — ns
162 TadV2oeH LS Data Valid before OE
(data setup time) 20 — — ns
163 ToeH2adl OE
 to Data In Invalid (data hold time) 0 — — ns
164 TalH2alL ALE Pulse Width — 0.25 T
CY —ns
165 ToeL2oeH OE
Pulse Width 0.5 TCY – 5 0.5 TCY —ns
166 TalH2alH ALE
 to ALE  (cycle time) — TCY —ns
167 Tacc Address Valid to Data Valid 0.75 T
CY – 25 — — ns
168 Toe OE
 to Data Valid — 0.5 TCY – 25 ns
169 TalL2oeH ALE
 to OE  0.625 TCY – 10 — 0.625 TCY + 10 ns
171 TalH2csL Chip Enable Active to ALE
 0.25 TCY – 20 — — ns
171A TubL2oeH AD Valid to Chip Enable Active — — 10 ns
Q1 Q2 Q3 Q4 Q1 Q2
OSC1
ALE
OE
Address Data from External
166
160
165
161
151
162
163
AD<15:0>
167
168
155
Address
Address
150
A<19:16>
Address
169
BA0
CE
171
171A
Operating Conditions: 2.0V < VCC < 3.6V, -40°C < TA < +125°C unless otherwise stated.
164