27C256 datasheet(3/12 Pages) MICROCHIP

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DS11001L-page 3

27C256

TABLE 1-3:

READ OPERATION AC CHARACTERISTICS

FIGURE 1-1:

READ WAVEFORMS

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

Automotive:

Tamb = -40

°C to +125°C

Parameter

Sym

27C256-90* 27C256-10* 27C256-12 27C256-15 27C256-20

Units

Conditions

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Address to Output

Delay

tACC

—

100

—

120

—

150

—

200

CE=OE =VIL

CE to Output Delay

tCE

—

100

—

120

—

150

—

200

OE = VIL

OE to Output Delay

tOE

—

CE = VIL

CE or OE to O/P

High Impedance

tOFF

Output Hold from

Address CE or OE,

whichever goes ﬁrst

tOH

—

0—

* -10, -90 AC Testing Waveform: VIH = 2.4V and VIL = .45V; VOH = 1.5V and VOL = 1.5V

Output Load: 1 TTL Load + 30pF

Address

VIH

VIL

VIH

VIL

VIH

VIL

Outputs

O0 - O7

VOH

VOL

Address Valid

tCE(2)

tOE(2)

High Z

Valid Output

tACC

(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.

High Z

tOH

tOFF(1,3)

Notes:

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