TE28F320B3BC90 datasheet(21/58 Pages) INTEL

21 / 58 page

28F004/400B3, 28F008/800B3, 28F016/160B3, 28F320B3, 28F640B3

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3.3.2

WP# = VIH for Block Unlocking

WP# = VIH unlocks all lockable blocks.

These blocks can now be programmed or erased.

Note that RP# does not override WP# locking as in previous Boot Block devices. WP# controls all

block locking and VPP provides protection against spurious writes. Table 8 defines the write

protection methods.

3.4

VPP Program and Erase Voltages

Intel

® 3 Volt Advanced Boot Block products provide in-system programming and erase at 2.7 V.

For customers requiring fast programming in their manufacturing environment, 3 Volt Advanced

Boot Block includes an additional low-cost 12 V programming feature.

The 12 V VPP mode enhances programming performance during the short period of time typically

found in manufacturing processes; however, it is not intended for extended use. 12 V may be

applied to VPP during program and erase operations for a maximum of 1000 cycles on the main

blocks and 2500 cycles on the parameter blocks. VPP may be connected to 12 V for a total of 80

hours maximum.

Warning:

Stressing the device beyond these limits may cause permanent damage.

During read operations or idle times, VPP may be tied to a 5 V supply. For program and erase

operations, a 5 V supply is not permitted. The VPP must be supplied with either 2.7 V–3.6 V or

11.4 V–12.6 V during program and erase operations.

3.4.1

VPP = VIL for Complete Protection

The VPP programming voltage can be held low for complete write protection of all blocks in the

flash device. When VPP is below VPPLK, any program or erase operation will result in a error,

prompting the corresponding status register bit (SR.3) to be set.

3.5

Power Consumption

Intel Flash devices have a tiered approach to power savings that can significantly reduce overall

system power consumption. The Automatic Power Savings (APS) feature reduces power

consumption when the device is selected but idle. If the CE# is deasserted, the flash enters its

standby mode, where current consumption is even lower. The combination of these features can

minimize memory power consumption, and therefore, overall system power consumption.

Table 8.

Write Protection Truth Table for the Advanced Boot Block Flash Memory Family

VPP

WP#

RP#

Write Protection Provided

VIL

All Blocks Locked

VIL

XVIH

All Blocks Locked

≥ V

PPLK

VIL

VIH

Lockable Blocks Locked

≥ V

PPLK

VIH

All Blocks Unlocked

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