27C512 datasheet(2/14 Pages) SYC

2 / 14 page

DEVICE OPERATION

The modes of operations of the M27C512 are listed

in the Operating Modes table.

A single power

supply is required in the read mode. All inputs are

TTL levels except for GVPP and 12V on A9 for

Electronic Signature.

Read Mode

The M27C512 has two control functions, both of

which must be logically active in order to obtain

data at the outputs. Chip Enable (E) is the power

control and should be used for device selection.

Output Enable (G) is the output control and should

be used to gate data to the output pins, inde-

pendent of device selection. Assuming that the

addresses are stable, the address access time

(tAVQV) is equal to the delay from E to output (tELQV).

Data is available at the output after a delay of tGLQV

from the falling edge of G, assuming that E has

been low and the addresses have been stable for

at least tAVQV-tGLQV.

Standby Mode

The M27C512 has a standby mode which reduces

the active current from 30mA to 100

µAThe

M27C512 is placed in the standby mode by apply-

ing a CMOS high signal to the E input. When in the

standby mode, the outputs are in a high impedance

state, independent of the GVPP input.

A13

A10

A14

A11

GVPP

VSS

A12

A15

VCC

AI00762

M27C512

Figure 2A. DIP Pin Connections

Warning: NC = Not Connected, DU = Don’t Use

AI00763

A10

A11

M27C512

GVPP

Figure 2B. LCC Pin Connections

A11

GVPP

A13

A14

A12

A15

VCC

AI00764B

M27C512

VSS

A10

Figure 2C. TSOP Pin Connections

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M27C512

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