MX26L6420TC-12 Просмотр технического описания (PDF) - Macronix International

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MX26L6420TC-12

64M-BIT [4M x 16] CMOS MULTIPLE-TIME-PROGRAMMABLE EPROM

Macronix International 

MX26L6420

RESET OPERATION

Table 3

The RESET pin provides a hardware method of resetting

the device to reading array data. When the RESET pin is

driven low for at least a period of tRP, the device

immediately terminates any operation in progress,

tristates all output pins, and ignores all read/write

commands for the duration of the RESET pluse. The

device also resets the internal state machine to reading

array data. The operation that was interrupted should be

reinitated once the device is ready to accept another

command sequence, to ensure data integrity

VCC / VI/O Voltage Range

Part No.

VCC=2.7V to 3.6VVCC=2.7V to 3.6V

VI/O=2.7V to 3.6VVI/O=1.65V to 2.6V

MX26L6420-90

90ns

100ns

MX26L6420-12

120ns

130ns

Notes: Typical values measured at VCC=2.7V to 3.6V,

VI/O=2.7V to 3.6V

Current is reduced for the duration of the RESET pulse.

When RESET is held at VSS±0.3V, the device draws

CMOS standby current (ICC4). If RESET is held at VIL

but not within VSS±0.3V, the standby current will be

greater.

The RESET pin may be tied to system reset circuitry. A

system reset would that also reset the MTP EPROM.

Refer to the AC Characteristics tables for RESET

parameters and to Figure 14 for the timing diagram.

SILICON ID READ OPERATION

MTP EPROM are intended for use in applications where

the local CPU alters memory contents. As such, manu-

facturer and device codes must be accessible while the

device resides in the target system. EPROM program-

mers typically access signature codes by raising A9 to

a high voltage. However, multiplexing high voltage onto

address lines is not generally desired system design prac-

tice.

MX26L6420 provides hardware method to access the

silicon ID read operation. Which method requires VID on

A9 pin, VIL on CE, OE, A6, and A1 pins. Which apply

VIL on A0 pin, the device will output MXIC's manufac-

ture code of C2H. Which apply VIH on A0 pin, the device

will output MX26L6420 device code of 22FCH.

DATA PROTECTION

The MX26L6420 is designed to offer protection against

accidental erasure or programming caused by spurious

system level signals that may exist during power transi-

tion. During power up the device automatically resets

the state machine in the Read mode. In addition, with

its control register architecture, alteration of the memory

contents only occurs after successful completion of spe-

cific command sequences. The device also incorporates

several features to prevent inadvertent write cycles re-

sulting from VCC power-up and power-down transition or

system noise.

SECURED SILICON SECTOR

The MX26L6420 features a Flash memory region where

the system may access through a command sequence

to create a permant part identification as so called Elec-

tronic Serial Number (ESN) in the device. Once this re-

gion is programmed, any further modification on the re-

gion is impossible. The secured silicon sector is a 512

words in length, and uses a Secured Silicon Sector Indi-

cator Bit (Q7) to indicate whether or not the Secured

Silicon Sector is locked when shipped from the factory.

This bit is permanently set at the factory and cannot be

changed, which prevent duplication of a factory locked

part.This ensures the security of the ESN once the prod-

uct is shipped to the field.

VI/O PIN OPERATION

MX26L6420 is capable to provide the I/O prower supply

(VI/O) pin to control Input/Output voltage levels of the

device. The data outputs and voltage tolerated at its data

input is determined by the voltage on the VI/O pin. This

device is allows to operate in 1.8V or 3V system as re-

quired.

The MX26L6420 offers the device with Secured Silicon

Sector either factory locked or custor lockable. The fac-

tory-locked version is always protected when shipped

from the factory , and has the Secured Silicon Sector

Indicator Bit permanently set to a "1". The customer-

lockable version is shipped with the Secured Silicon

Sector unprotected, allowing customer to utilize that sec-

tor in any form they prefer. The customer-lockable ver-

P/N:PM0823

REV. 0.5, JAN. 29, 2002

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