MX27C2000A データシートの表示（PDF） - Macronix International

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MX27C2000A

2M-BIT [256K x 8] CMOS EPROM

Macronix International 

MX27C2000A

BLOCK DIAGRAM

CE

PGM

OE

CONTROL

LOGIC

OUTPUT

BUFFERS

.

.

.

A0~A17

.

ADDRESS

.

INPUTS

.

.

.

VCC

VSS

Y-DECODER

.

.

.

.

.

X-DECODER

.

.

.

VPP

Y-SELECT

2M BIT

CELL

MAXTRIX

FUNCTIONAL DESCRIPTION

PROGRAM INHIBIT MODE

Programming of multiple MX27C2000As in parallel with

Q0~Q7 different data is also easily accomplished by using the

Program Inhibit Mode. Except for CE and OE, all like

inputs of the parallel MX27C2000A may be common. A

TTL low-level program pulse applied to an MX27C2000A

CE input with VPP = 12.5 ± 0.5 V and PGM LOW will

program that MX27C2000A. A high-level CE input

inhibits the other MX27C2000A from being programmed.

PROGRAM VERIFY MODE

Verification should be performed on the programmed bits

to determine that they were correctly programmed. The

verification should be performed with OE and CE at VIL,

PGM at VIH, and VPP at its programming voltage.

THE PROGRAMMING OF THE MX27C2000A

When the MX27C2000A is delivered, or it is erased, the

chip has all 2M bits in the "ONE", or HIGH state.

"ZEROs" are loaded into the MX27C2000A through the

procedure of programming.

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 OTP ROM, a 0.1uF 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 = 6.25V and PGM = VIH (Algorithm is shown in

Figure 1). The programming is achieved by applying a

single TTL low level 10us 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%.

AUTO IDENTIFY MODE

The auto identify mode allows the reading out of a binary

code from an EPROM that will identify its manufacturer

and device type. This mode is intended for use by

programming equipment for the purpose of automatically

matching the device to be programmed with its

corresponding programming algorithm. This mode is

functional in the 25°C ± 5°C ambient temperature range

that is required when programming the MX27C2000A.

To activate this mode, the programming equipment must

force 12.0 ± 0.5 V on address line A9 of the device. Two

identifier bytes may then be sequenced from the device

outputs by toggling address line A0 from VIL to VIH. All

other address lines must be held at VIL during auto

identify mode.

Byte 0 ( A0 = VIL) represents the manufacturer code, and

byte 1 (A0 = VIH), the device identifier code. For the

MX27C2000A, these two identifier bytes are given in the

Mode Select Table. All identifiers for manufacturer and

device codes will possess odd parity, with the MSB (Q7)

defined as the parity bit.

READ MODE

The MX27C2000A has two control functions, both of

which must be logically satisfied in order to obtain data

at the outputs. Chip Enable (CE) is the power control and

should be used for device selection. Output Enable (OE)

P/N: PM0708

2

REV. 2.0, AUG. 27, 2003

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