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SN74AVCA406E

MMC AND SD CARD VOLTAGE-TRANSLATION TRANSCEIVER

SCES659C – OCTOBER 2007 – REVISED MARCH 2008

PIN DESCRIPTION

ZQS

ZXY

NAME

FUNCTION

TYPE

BALL NO.

BALL NO.

A1

B4

DAT2A

I/O

A2

B5

CMD-dir

Direction control for command bit (CMDA/CMDB)

Input

A3

C5

DAT0-dir

Direction control for DAT0A/DAT0B

Input

A4, C2

–

RSV

Reserved (for possible future functionality). Leave unconnected.

A5

C5

DAT2B

Data bit 3 connected to memory card. Includes a 70-k

I/O

B1

A4

DAT3A

I/O

B2

–

–

Depopulated ball

B3

A5

Power

B4

D5

Power

B5

D4

DAT3B

Data bit 4 connected to memory card. Includes a 470-k

I/O

C1

A3

CLKA

Input

C3

B3

GND

Ground

C4

C3

GND

Ground

C5

D3

CLKB

Output

D1

B2

DAT0A

I/O

D2

B1

CMDA

I/O

Connected to card detect on the mechanical connector.

D3

–

CD

Output

CD has an internal 100-k

D4

C2

CMDB

Command bit connected to memory card. Includes a 15-k

I/O

D5

D2

DAT0B

Data bit 1 connected to memory card. Includes a 70-k

I/O

E1

A2

DAT1A

I/O

Clock feedback to host for resynchronizing data. Used in OMAP processors. Leave

E2

A1

CLK-f

Output

unconnected if not used.

E3

C1

DAT123-dir

Direction control for DAT1A/B, DAT2A/B, and DAT3A/B

Input

Connected to write protect on the mechanical connector.

E4

–

WP

Output

WP has an internal 100-k

E5

D1

DAT1B

Data bit 2 connected to memory card. Includes a 70-k

I/O

Copyright © 2007–2008, Texas Instruments Incorporated

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