PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 162

• Manufacturer Part Number: PIC17C42
• Description: High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
• Manufacturer: Microchip Technology

PIC17C4X
FIGURE 17-12: MEMORY INTERFACE READ TIMING
TABLE 17-12: MEMORY INTERFACE READ REQUIREMENTS
DS30412C-page 162
Applicable Devices 42 R42 42A 43 R43 44
Parameter
*
†
§
AD<15:0>
150
151
160
161
162
163
164
165
166
167
168
No.
OSC1
ALE
WR
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.
This specification guaranteed by design.
OE
Sym
TadV2alL
TalL2adI
TadZ2oeL
ToeH2adD
TadV2oeH
ToeH2adI
TalH
ToeL
TalH2alH
Tacc
Toe
'1'
Q1
Characteristic
AD<15:0> (address) valid to ALE
(address setup time)
ALE to address out invalid
(address hold time)
AD<15:0> high impedance to OE
OE to AD<15:0> driven
Data in valid before OE
(data setup time)
OE to data in invalid (data hold time)
ALE pulse width
OE pulse width
ALE to ALE (cycle time)
Address access time
Output enable access time
(OE low to Data Valid)
150
Q2
164
Addr out
151
Q3
167
160
168
0.5Tcy - 35 §
162
0.25Tcy - 30
0.25Tcy - 15
166
Min
35
5*
0*
—
—
—
—
165
0
Data in
Q4
0.25T
T
Typ†
CY
—
—
—
—
—
—
—
—
—
CY
§
163
§
0.75 T
0.5 T
Q1
1996 Microchip Technology Inc.
Max
—
—
—
—
—
—
—
—
—
CY
CY
- 60
-40
161
Units Conditions
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Addr out
Q2
'1'