M87C257 datasheet(6/13 Pages) STMICROELECTRONICS

6 / 13 page

Symbol

Alt

Parameter

Test

Condition

M87C257

Unit

-90

-10

-12

-15/-20

Min Max Min Max Min Max Min Max

tAVQV

tACC

Address Valid to

Output Valid

E = VIL, G = VIL

100

120

150

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

100

120

150

tGLQV

tOE

Output Enable Low to

Output Valid

E = VIL

tEHQZ

(2)

tDF

Chip Enable High to

Output Hi-Z

G = VIL

0400

30040040

tGHQZ

(2)

tDF

Output Enable High to

Output Hi-Z

E = VIL

0400

30040040

tAXQX

tOH

Address Transition to

Output Transition

E = VIL, G = VIL

000

Notes: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.

2. Sampled only, not 100% tested.

Table 8B. Read Mode AC Characteristics (1)

(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)

AI00931

tAXQX

tEHQZ

DATA OUT

A0-A14

Q0-Q7

tASLAX

tGHQZ

tGLQV

tELQV

VALID

Hi-Z

tAVQV

tASLGL

tASHASL

tAVASL

ASVPP

Figure 5. Read Mode AC Waveforms

6/13

M87C257

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