PIC17C75X Datasheet, PDF (247/320 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers

PIC17C75X
FIGURE 20-18: MEMORY INTERFACE WRITE TIMING
Q1
Q2
Q3
OSC1
ALE
OE
WR
AD<15:0>
151
150
addr out
152
Q4
Q1
154
data out
153
Q2
addr out
TABLE 20-19: MEMORY INTERFACE WRITE REQUIREMENTS
Param.
No. Sym
Characteristic
Min
Typ†
Max Units Conditions
150 TadV2alL AD<15:0> (address) valid to PIC17CXXX 0.25Tcy - 10
—
ALE↓ (address setup time) PIC17LCXXX
TBD
—
151 TalL2adI ALE↓ to address out invalid PIC17CXXX
0
—
(address hold time)
PIC17LCXXX
TBD
—
—
ns
—
—
ns
—
152 TadV2wrL Data out valid to WR↓
(data setup time)
PIC17CXXX 0.25Tcy - 40
—
PIC17LCXXX
TBD
—
—
ns
—
153 TwrH2adI WR↑ to data out invalid
PIC17CXXX
—
0.25TCY § —
ns
(data hold time)
PIC17LCXXX
—
TBD
—
154
*
†
§
TwrL
WR pulse width
PIC17CXXX
—
0.25TCY § —
ns
PIC17LCXXX
—
TBD
—
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.
© 1997 Microchip Technology Inc.
Preliminary
DS30264A-page 247