PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 191

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

FIGURE 19-12: MEMORY INTERFACE READ TIMING (NOT SUPPORTED IN PIC17LC4X DEVICES)
TABLE 19-12: MEMORY INTERFACE READ REQUIREMENTS (NOT SUPPORTED IN PIC17LC4X
Parameter
1996 Microchip Technology Inc.
*
†
§
AD<15:0>
No.
150
151
160
161
162
163
164
165
166
167
168
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 ensured by design.
OE
Sym
TadV2alL
TalL2adI
TadZ2oeL
ToeH2adD
TadV2oeH
ToeH2adI
TalH
ToeL
TalH2alH
Tacc
Toe
'1'
DEVICES)
Q1
Characteristic
AD15:AD0 (address) valid to ALE
(address setup time)
ALE to address out invalid
(address hold time)
AD15:AD0 hi-impedance to OE
OE to AD15:AD0 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)
Q2
164
Addr out
150
167
Q3
151
160
168
0.5Tcy - 35 §
0.25Tcy - 10
0.25Tcy - 15
Applicable Devices 42 R42 42A 43 R43 44
Min
35
166
5*
0*
—
—
—
—
0
165
Data in
162
Q4
0.25T
T
Typ†
CY
—
—
—
—
—
—
—
—
—
CY
§
163
§
0.75T
0.5T
Q1
Max
CY
—
—
—
—
—
—
—
—
—
PIC17C4X
CY
- 45
- 30
161
DS30412C-page 191
Units Conditions
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Addr out
Q2
'1'