M87C257 datasheet(15/22 Pages) STMICROELECTRONICS

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M87C257

DC and AC parameters

15/22

Table 9.

Read mode AC characteristics 1(1) (2)

TA = 0 to 70 °C, –40 to 85 °C; –40 to 105 °C or –40 to 125 °C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC

VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.

Symbol Alt

Parameter

Test

Condition

M87C257

Unit

-45(3)

Speed obtained with High Speed AC measurement conditions.

-60

-70

-80

Min Max Min Max Min Max Min Max

tAVQV

tACC

Address Valid to

Output Valid

E = VIL,

G = VIL

tAVASL

tAL

Address Valid to

Address Strobe Low

777

tASHASL tLL

Address Strobe High

to Address Strobe Low

tASLAX

tLA

Address Strobe Low to

Address Transition

tASLGL tLOE

Address Strobe Low to

Output Enable Low

tELQV

tCE

Chip Enable Low to

Output Valid

G = VIL

tGLQV

tOE

Output Enable Low to

Output Valid

E = VIL

tEHQZ

(4)

Sampled only, not 100% tested.

tDF

Chip Enable High to

Output Hi-Z

G = VIL

0250300

040

tGHQZ

(4)

tDF

Output Enable High to

Output Hi-Z

E = VIL

0250300

040

tAXQX

tOH

Address Transition to

Output Transition

E = VIL,

G = VIL

000

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