28C04A
TABLE 1-4:
BYTE WRITE AC CHARACTERISTICS
AC Testing Waveform:
Output Load:
VIH = 2.4V; VIL = 0.45V; VOH = 2.0V; VOL = 0.8V
1 TTL Load + 100 pF
Input Rise/Fall Times:
Ambient Temperature:
20 nsec
Commercial (C): Tamb= 0˚C to 70˚C
Industrial
(I): Tamb= -40˚C to 85˚C
Parameter
Symbol
Min
Max
Units
Remarks
Address Set-Up Time
Address Hold Time
Data Set-Up Time
Data Hold Time
tAS
tAH
10
50
50
10
100
50
10
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
µs
tDS
tDH
Write Pulse Width
Write Pulse High Time
OE Hold Time
tWPL
tWPH
tOEH
tOES
tDV
Note 1
Note 2
OE Set-Up Time
Data Valid Time
1000
1
tWC
tWC
0.5 ms typical
Write Cycle Time (28C04A)
Write Cycle Time (28C04AF)
200
100 µs typical
Note 1: A write cycle can be initiated be CE or WE going low, whichever occurs last. The data is latched on the pos-
itive edge of CE or WE, whichever occurs first.
2: Data must be valid within 1000ns max. after a write cycle is initiated and must be stable at least until tDH after
the positive edge of WE or CE, whichever occurs first.
FIGURE 1-2: PROGRAMMING WAVEFORMS
VIH
Address
VIL
tAS
tAH
VIH
VIL
tWPL
tDS
CE, WE
Data In
tDH
tDV
VIH
VIL
tOES
VIH
VIL
OE
tOEH
DS11126F-page 4
1996 Microchip Technology Inc.