6

Am27C010

CE# should be decoded and used as the primary de-

vice-selecting function, while OE# be made a common

connection to all devices in the array and connected to

the READ line from the system control bus. This as-

sures that all deselected memory devices are in their

low-power standby mode and that the output pins are

only active when data is desired from a particular mem-

ory device.

System Applications

During the switch between active and standby condi-

tions, transient current peaks are produced on the ris-

ing and falling edges of Chip Enable. The magnitude of

these transient current peaks is dependent on the out-

put capacitance loading of the device. At a minimum, a

0.1 µF ceramic capacitor (high frequency, low inherent

inductance) should be used on each device between

to overcome the voltage drop caused by the inductive

effects of the printed circuit board traces on EPROM ar-

rays, a 4.7 µF bulk electrolytic capacitor should be used

tion of the capacitor should be close to where the

power supply is connected to the array.

MODE SELECT TABLE

Notes:

Mode

CE#

OE#

PGM#

A0

A9

Outputs

Read

XX

X

X

Output Disable

X

X

X

X

X

High Z

Standby (TTL)

X

X

X

X

X

High Z

Standby (CMOS)

X

X

X

X

X

High Z

Program

XX

Program Verify

XX

Program Inhibit

XX

X

X

High Z

Autoselect

(Note 3)

Manufacturer Code

X01h

Device Code

X0Eh