28C16A
TABLE 1-4:
BYTE WRITE AC CHARACTERISTICS
AC Testing Waveform:
Output Load:
Input Rise/Fall Times:
Ambient Temperature:
VIH = 2.4V and VIL = 0.45V; VOH = 2.0V; VOL = 0.8V
1 TTL Load + 100 pF
20 ns
Commercial (C):
Industrial (I):
Tamb
Tamb
=
=
0˚C to +70˚C
-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
—
—
OE Set-Up Time
—
Data Valid Time
1000
1
Note 2
tWC
tWC
—
0.5 ms typical
100 µs typical
Write Cycle Time (28C16A)
Write Cycle Time (28C16AF)
—
200
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
DS11125G-page 4
1996 Microchip Technology Inc.