M27V405 datasheet(3/13 Pages) STMICROELECTRONICS

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M27V405

The M27V405 is pin compatible with the industry

standard 4 Mbit, single voltage Flash Memory. It

can be considered as a Flash Low Cost solution

for production quantities.

The M27V405 can also be operated as a standard

4 Mbit OTP EPROM (similar to M27C405) with a

5V power supply. The M27V405 is offered in

PLCC32 and TSOP32 (12 x 20 mm) packages.

DEVICE OPERATION

The modes of operations of the M27V405 are list-

ed in the Operating Modes table. A single power

supply is required in the read mode. All inputs are

TTL levels except for Vpp and 12V on A9 for Elec-

tronic Signature.

Read Mode

The M27V405 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, indepen-

dent of device selection. Assuming that the ad-

dresses 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 sta-

ble for at least tAVQV-tGLQV.

Standby Mode

The M27V405 has a standby mode which reduces

the active current from 15mA to 20µA with low volt-

age operation VCC ≤ 3.6V , see Read Mode DC

Characteristics Table for details. The M27V405 is

placed in the standby mode by applying a CMOS

high signal to the E input. When in the standby

mode, the outputs are in a high impedance state,

independent of the G input.

Table 3. Operating Modes

Note: X = VIH or VIL, VID = 12V ± 0.5V.

Table 4. Electronic Signature

Mode

VPP

Q0-Q7

Read

VIL

VCC or VSS

Data Out

Output Disable

VIL

VIH

VCC or VSS

Hi-Z

Program

VIL Pulse

VIH

VPP

Data In

Verify

VIH

VIL

VPP

Data Out

Program Inhibit

VIH

VPP

Hi-Z

Standby

VIH

VCC or VSS

Hi-Z

Electronic Signature

VIL

VID

VCC

Codes

Identifier

Hex Data

Manufacturer’s Code

VIL

00100000

20h

Device Code

VIH

10110100

B4h

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