AT5FC004-20 查看數據表（PDF） - Atmel Corporation

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AT5FC004-20

4-Megabyte Flash Memory PCMCIA Card

Atmel Corporation 

AT5FC004

Pin Description

Symbol

Name

A0-A21

Address Inputs

D0-D15

Data Input/Output

CE1, CE2

Card Enable

OE

Output Enable

WE

Write Enable

VCC

GND

CD1, CD2

PC Card Power

Supply

Ground

Card Detect

WP

Write Protect

NC

BVD1, BVD2

No Connect

Battery Voltage Detect

REG

Register Select

Type

Function

Input

Address Inputs are internally latched during write cycles.

Input/Output

Data Input/Outputs are internally latched on write cycles.

Data outputs are latched during read cycles. Data pins

are active high. When the memory card is de-selected or

the outputs are disabled the outputs float to tri-state.

Input

Card Enable is active low. The memory card is

de-selected and power consumption is reduced to

standby levels when CE is high. CE activates the internal

memory card circuitry that controls the high and low byte

control logic of the card, input buffers, segment decoders,

and associated memory devices.

Input

Output Enable is active low and enables the data buffers

through the card outputs during read cycles.

Input

Write Enable is active low and controls the write function

to the memory array. The target address is latched on the

falling edge of the WE pulse and the appropriate data is

latched on the rising edge of the pulse.

PC Card Power Supply for device operation

(5.0 V ± 5%)

Ground

Output

When Card Detect 1 and 2 = Ground the system detects

the card.

Output

Write Protect is active high and indicates that all card

write operations are disabled by the write protect switch.

Corresponding pin is not connected internally.

Output

Internally pulled up. (There is no battery in the card.)

Input

Provide access to Card Information Structure in the

Attribute Memory Device

5

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