E28F004BL-T150 Ver la hoja de datos (PDF) - Intel

Número de pieza

componentes Descripción

Fabricante

E28F004BL-T150

4-MBlT (256K x 16, 512K x 8) LOW-POWER BOOT BLOCK FLASH MEMORY FAMILY

Intel 

28F400BL-T B 28F004BL-T B

4 2 28F004BL Bus Operations

Mode

Read

Output Disable

Standby

Deep Power-Down

Intelligent Identifier (Mfr)

Intelligent Identifier (Device)

Table 3 Bus Operations

Notes RP CE OE

12

VIH

VIL

VIL

VIH

VIL

VIH

VIH

VIH

X

9

VIL

X

X

34

VIH

VIL

VIL

3 4 5 10 VIH

VIL

VIL

WE

VIH

VIH

X

X

VIH

VIH

A9 A0 VPP

XX X

XX X

XX X

XX X

VID VIL X

VID VIH X

Write

678

VIH

VIL

VIH

VIL

X

X

X

NOTES

1 Refer to DC Characteristics

2 X can be VIL or VIH for control pins and addresses VPPL or VPPH for VPP

3 See DC Characteristics for VPPL VPPH VHH VID voltages

4 Manufacturer and Device codes may also be accessed via a CUI write sequence A1 – A8 A10 – A18 e VIL

5 Device ID e 78H for 28F004BL-T and 79H for 28F004BL-B

6 Refer to Table 4 for valid DIN during a write operation

7 Command writes for Block erase or byte program are only executed when VPP e VPPH

8 Program or erase the Boot block by holding RP at VHH

9 RP must be at GND g0 2V to meet the 1 2 mA maximum deep power-down current

10 The device ID codes are identical to those of the 28F004BX 5V version and SmartVoltage equivalent

DQ0-7

DOUT

High Z

High Z

High Z

89H

78H

79H

DIN

4 3 Read Operations

The 4-Mbit flash family has three user read modes

Array Intelligent Identifier and Status Register

Status Register read mode will be discussed in detail

in the ‘‘Write Operations’’ section

During power-up conditions (VCC supply ramping) it

takes a maximum of 600 ns from VCC at 3 0V mini-

mum to obtain valid data on the outputs

4 3 1 READ ARRAY

If the memory is not in the Read Array mode it is

necessary to write the appropriate read mode com-

mand to the CUI The 4-Mbit flash family has three

control functions all of which must be logically ac-

tive to obtain data at the outputs Chip-Enable CE

is the device selection control Power-Down RP is

the device power control Output-Enable OE is the

DATA INPUT OUTPUT (DQ 0 15 or DQ 0 7 ) direc-

tion control and when active is used to drive data

from the selected memory onto the I O bus

4 3 1 2 Input Control

With WE at logic-high level (VIH) input to the de-

vice is disabled Data Input Output pins (DQ 0 15

or DQ 0 7 ) are controlled by OE

4 3 2 INTELLIGENT IDENTlFlERS

28F400BL PRODUCTS

The manufacturer and device codes are read via the

CUI or by taking the A9 pin to 12V Writing 90H to

the CUI places the device into Intelligent Identifier

read mode A read of location 00000H outputs the

manufacturer’s identification code 0089H and loca-

tion 00001H outputs the device code 4470H for

28F400BL-T 4471H for 28F4001BL-B When

BYTE is at a logic low only the lower byte of the

above signatures is read and DQ15 Ab1 is a ‘‘don’t

care’’ during Intelligent Identifier mode A read array

command must be written to the CUI to return to the

read array mode

4 3 1 1 Output Control

With OE at logic-high level (VIH) the output from

the device is disabled and data input output pins

(DQ 0 15 or DQ 0 7 are tri-stated Data input is

then controlled by WE

18

Share Link: