PIC17C7XX_13 Datasheet, PDF (266/306 Pages) Microchip Technology – High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
FIGURE 20-25: MEMORY INTERFACE READ TIMING
Q1
Q2
Q3
Q4
Q1
OSC1
ALE
OE
AD<15:0>
'1'
WR
166
164
168
160
165
Addr out
150
151
167
Data in
162
163
Q2
161
Addr out
'1'
TABLE 20-21: MEMORY INTERFACE READ REQUIREMENTS
Param.
No.
Sym
Characteristic
Min
150 TadV2alL AD15:AD0 (address) valid to PIC17CXXX 0.25TCY - 10
ALE (address setup time) PIC17LCXXX 0.25TCY - 10
151 TalL2adI ALE to address out invalid PIC17CXXX
5
(address hold time)
PIC17LCXXX
5
160 TadZ2oeL AD15:AD0 hi-impedance to PIC17CXXX
0
OE
PIC17LCXXX
0
161 ToeH2ad OE to AD15:AD0 driven
D
PIC17CXXX 0.25TCY - 15
PIC17LCXXX 0.25TCY - 15
162 TadV2oeH Data in valid before OE PIC17CXXX
35
(data setup time)
PIC17LCXXX
45
163 ToeH2adI OEto data in invalid
PIC17CXXX
0
(data hold time)
PIC17LCXXX
0
164 TalH
ALE pulse width
PIC17CXXX
—
PIC17LCXXX
—
165 ToeL
OE pulse width
PIC17CXXX 0.5TCY - 35
PIC17LCXXX 0.5TCY - 35
166 TalH2alH ALE to ALE(cycle time) PIC17CXXX
—
PIC17LCXXX
—
167 Tacc
Address access time
PIC17CXXX
—
PIC17LCXXX
—
168 Toe
Output enable access time PIC17CXXX
—
(OE low to data valid)
PIC17LCXXX
—
†
° Data in “Typ” column is at 5V, 25 C unless otherwise stated.
Typ†
—
—
—
—
—
—
—
—
—
—
—
—
0.25TCY
0.25TCY
—
—
TCY
TCY
—
—
—
—
Max
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.75TCY - 30
0.75TCY - 45
0.5TCY - 45
0.5TCY - 75
Unit
s
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Conditions
DS30289C-page 266
 1998-2013 Microchip Technology Inc.