MX27C1001 datasheet(2/18 Pages) MCNIX

2 / 18 page

MX27C1000/1001

REV. 5.3, MAY 07, 1998

P/N: PM0234

For programming, the data to be programmed is applied

with 8 bits in parallel to the data pins.

Vcc must be applied simultaneously or before Vpp, and

removed simultaneously or after Vpp.

When

programming an MXIC EPROM, a 01.uF capacitor is

required across Vpp and ground to suppress spurious

voltage transients which may damage the device.

FAST PROGRAMMING

The device is set up in the fast programming mode when

the programming voltage VPP = 12.75V is applied, with

VCC = 6.25 V and PGM = VIL(or OE = VIH) (Algorithm

is shown in Figure 1). The programming is achieved by

applying a single TTL low level 100us pulse to the PGM

input after addresses and data line are stable. If the data

is not verified, an additional pulse is applied for a

maximum of 25 pulses. This process is repeated while

sequencing through each address of the device. When

the programming mode is completed, the data in all

address is verified at VCC = VPP = 5V ± 10%.

BLOCK DIAGRAM

PIN DESCRIPTION

FUNCTIONAL DESCRIPTION

THE ERASURE OF THE MX27C1000/1001

The MX27C1000/1001 is erased by exposing the chip

to an ultraviolet light source. A dosage of 15 W seconds/

cm2 is required to completely erase a MX27C1000/1001

This dosage can be obtained by exposure to an ultraviolet

lamp - wavelength of 2537 Angstroms (A) - with intensity

of 12,000 uW/cm2 for 15 to 20 minutes. The MX27C1000/

1001 should be directly under and about one inch from

the source and all filters should be removed from the UV

light source prior to erasure.

It is important to note that the MX27C1000/1001, and

similar devices, will be cleared for all bits of their

programmed states with light sources having

wavelengths shorter than 4000 A Although erasure times

will be much longer than that with UV sources at 2537A

nevertheless

the exposure to fluorescent light and

sunlight will eventually erase the MX27C1000/1001 and

exposure to them should be prevented to realize

maximum system reliability.

If used in such an

environment, the package window should be covered by

an opaque label or substance.

THE PROGRAMMING OF THE MX27C1000/1001

When the MX27C1000/1001 is delivered, or it is erased,

the chip has all 1M bits in the "ONE" or HIGH state.

"ZEROs" are loaded into the MX27C1000 through the

procedure of programming.

SYMBOL

PIN NAME

A0~A16

Address Input

Q0~Q7

Data Input/Output

Chip Enable Input

Output Enable Input

PGM

Programmable Enable Input

VPP

Program Supply Voltage

No Internal Connection

VCC

Power Supply Pin (+5V)

GND

Ground Pin

CONTROL

LOGIC

OUTPUT

BUFFERS

Q0~Q17

PGM

A0~A16

ADDRESS

INPUTS

Y-DECODER

X-DECODER

Y-SELECT

1M BIT

CELL

MAXTRIX

VCC

GND

VPP

INDEX

MX27C1001 Datasheet(PDF) 2 Page - Macronix International

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