M27V401

6/15

Figure 5. Read Mode AC Waveforms

AI00724B

tAXQX

tEHQZ

A0-A18

E

G

Q0-Q7

tAVQV

tGHQZ

tGLQV

tELQV

VALID

Hi-Z

VALID

2. Sampled only, not 100% tested.

Symbol

Alt

Parameter

Test Condition

M27V401

Unit

-180

-200

Min

Max

Min

Max

Address Valid to Output Valid

180

200

ns

Chip Enable Low to Output Valid

180

200

ns

Output Enable Low to Output Valid

90

100

ns

(2)

Chip Enable High to Output Hi-Z

0

50

0

70

ns

(2)

Output Enable High to Output Hi-Z

0

50

0

70

ns

Address Transition to Output

Transition

00

ns

System Considerations

The power switching characteristics of Advanced

CMOS EPROMs require careful decoupling of the

ments that are of interest to the system designer:

the standby current level, the active current level,

and transient current peaks that are produced by

the falling and rising edges of E. The magnitude of

the transient current peaks is dependent on the

capacitive and inductive loading of the device at

the output.

The associated transient voltage peaks can be

suppressed by complying with the two line output

control and by properly selected decoupling ca-

pacitors. It is recommended that a 0.1

µF ceramic

tor of low inherent inductance and should be

placed as close to the device as possible. In addi-

tion, a 4.7

µF bulk electrolytic capacitor should be

es. The bulk capacitor should be located near the

power supply connection point. The purpose of the

bulk capacitor is to overcome the voltage drop

caused by the inductive effects of PCB traces.