PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 161

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

FIGURE 17-11: MEMORY INTERFACE WRITE TIMING
TABLE 17-11: MEMORY INTERFACE WRITE REQUIREMENTS
1996 Microchip Technology Inc.
*
†
§
AD<15:0>
Parameter
150
151
152
153
154
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 is guaranteed by design.
OE
Sym
TadV2alL
TalL2adI
TadV2wrL
TwrH2adI
TwrL
Q1
Characteristic
AD<15:0> (address) valid to ALE
(address setup time)
ALE to address out invalid
(address hold time)
Data out valid to WR
(data setup time)
WR
(data hold time)
WR pulse width
to data out invalid
Q2
addr out
150
Q3
151
152
Applicable Devices 42 R42 42A 43 R43 44
0.25Tcy - 30
0.25Tcy - 40
Min
—
—
0
Q4
154
data out
0.25T
0.25T
Typ†
—
—
—
CY
CY
Q1
§
§
153
PIC17C4X
Max
—
—
—
—
—
DS30412C-page 161
Units Conditions
ns
ns
ns
ns
ns
Q2
addr out