M27C4002-20J6 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M27C4002-20J6

4 Mbit (256Kb x16) UV EPROM and OTP EPROM

STMicroelectronics 

Figure 5. Read Mode AC Waveforms

A0-A17

E

G

Q0-Q15

VALID

tAVQV

tGLQV

tELQV

M27C4002

tAXQX

VALID

tEHQZ

tGHQZ

Hi-Z

AI00731B

System Considerations

The power switching characteristics of Advanced

CMOS EPROMs require careful decoupling of the

devices. The supply current, ICC, has three seg-

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

output capacitive and inductive loading of the de-

vice. The associated transient voltage peaks can

be suppressed by complying with the two line out-

put control and by properly selected decoupling

capacitors. It is recommended that a 0.1µF ceram-

ic capacitor be used on every device between VCC

and VSS. This should be a high frequency capaci-

tor of low inherent inductance and should be

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

tion, a 4.7µF bulk electrolytic capacitor should be

used between VCC and VSS for every eight devic-

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.

7/18

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