
1996 Microchip Technology Inc.
DS30412C-page 161
PIC17C4X
Applicable Devices 42 R42 42A 43 R43 44
FIGURE 17-11: MEMORY INTERFACE WRITE TIMING
TABLE 17-11: MEMORY INTERFACE WRITE REQUIREMENTS
Parameter
No.
Sym
Characteristic
Min
Typ
Max
Units Conditions
150
TadV2alL
AD<15:0> (address) valid to ALE
↓
(address setup time)
0.25Tcy - 30
—
ns
151
TalL2adI
ALE
↓ to address out invalid
(address hold time)
0—
—
ns
152
TadV2wrL
Data out valid to WR
↓
(data setup time)
0.25Tcy - 40
—
ns
153
TwrH2adI
WR
↑ to data out invalid
(data hold time)
—
0.25TCY §
—
ns
154
TwrL
WR pulse width
—
0.25TCY §
—
ns
*
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 specication is guaranteed by design.
OSC1
ALE
OE
WR
AD<15:0>
Q1
Q2
Q3
Q4
Q1
Q2
150
151
152
153
154
addr out
data out
addr out