FT122 datasheet(7/47 Pages) FTDI

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Document No.: FT_000647

FT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL

BUS

IC Datasheet Version 1.1

Clearance No.: FTDI#

313

3.3 Pin Description

PIN No.

(TSSOP-

28)

PIN No.

(QFN-

28)

PIN NAME

TYPE

DESCRIPTION

Data bus bit 0.

Data bus bit 1.

Data bus bit 2.

Data bus bit 3.

VCCIO

IO Supply Voltage; 1.8V, 2.5V or 3.3V

Data bus bit 4.

Data bus bit 5.

Data bus bit 6.

Data bus bit 7.

ALE

Address latch enable for multiplexed address/data

bus configuration.

This pin must be pulled Low for non-multiplexed

address/data bus configuration.

CS_n

Chip select (Active Low).

SUSPEND

I,OD

Device suspend (output) and wakeup (input).

CLKOUT

Programmable output clock.

INT_n

Interrupt (Active Low).

RD_n

Read enable (Active Low).

WR_n

Write enable (Active Low).

DMREQ

DMA request.

DMACK_n

DMA acknowledge (Active Low).

EOT_n

End of DMA transfer (Active Low). Also function

as Vbus sensing input for self-powered

application.

RESET_n

Asynchronous reset (Active Low).

GL_n

USB bus activity indicator (Active Low)

VOUT3V3

3.3V regulator output for 5V operation;

To operate the IC at 3.3 V, supply 3.3 V to both

the VCC and VOUT3V3 pins

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