Datasheet

 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 specification 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