27LV256 Ver la hoja de datos (PDF) - Microchip Technology
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27LV256 Datasheet PDF : 12 Pages
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27LV256
TABLE 1-3: READ OPERATION AC CHARACTERISTICS
AC Testing Waveform: VIH = 2.4V and VIL = 0.45V; VOH = 2.0V VOL = 0.8V
Output Load:
1 TTL Load + 100 pF
Input Rise and Fall Times: 10 ns
Ambient Temperature: Commercial:
Tamb = 0˚C to +70˚C
Industrial:
Tamb = -40˚C to +85˚C
Parameter
Sym
27HC256-20
Min Max
27HC256-25
Min Max
27HC256-30
Min Max
Units
Conditions
Address to Output Delay tACC —
200
—
250 — 300
ns CE = OE = VIL
CE to Output Delay
tCE
—
200
—
250 — 300
ns OE = VIL
OE to Output Delay
tOE
—
100
—
125 — 125
ns CE = VIL
CE or OE to O/P High
tOFF
0
50
0
50
0
50
ns
Impedance
Output Hold from
Address CE or OE,
whichever goes first
tOH
0
—
0
—
0
—
ns
FIGURE 1-1: READ WAVEFORMS
VIH
Address
VIL
Address valid
VIH
CE
VIL
VIH
OE
VIL
Outputs VOH
O0 - O7 VOL
High Z
tCE(2)
tOE(2)
tACC
tOFF(1,3)
tOH
Valid Output
High Z
Notes: (1) tOFF is specified for OE or CE, whichever occurs first
(2) OE may be delayed up to t CE - t OE after the falling edge of CE without impact on tCE
(3) This parameter is sampled and is not 100% tested.
© 1996 Microchip Technology Inc.
DS11020F-page 3
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