CY74FCT2245T

8-BIT TRANSCEIVER

WITH 3-STATE OUTPUTS

SCCS037B – JULY 1994 – REVISED NOVEMBER 2001

1

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

D Function and Pinout Compatible With FCT

and F Logic

D 25-Ω Output Series Resistors to Reduce

Transmission-Line Reflection Noise

D Edge-Rate Control Circuitry for

Significantly Improved Noise

Characteristics

D Ioff Supports Partial-Power-Down Mode

Operation

D Fully Compatible With TTL Input and

Output Logic Levels

D ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

D 12-mA Output Sink Current

15-mA Output Source Current

D 3-State Outputs

description

The CY74FCT2245T contains eight noninverting, bidirectional buffers with 3-state outputs intended for

bus-oriented applications. On-chip termination resistors at the outputs reduce system noise caused by

reflections. For this reason, the CY74FCT2245T can replace the CY74FCT245T in an existing design. The

CY74FCT2245T current-sinking capability is 12 mA at the A and B ports.

The transmit/receive (T/R) input determines the direction of data flow through the bidirectional transceiver.

Transmit (active high) enables data from A ports to B ports; receive (active low) enables data from B ports to

A ports. The output-enable (OE) input, when high, disables both the A and B ports by putting them in the

high-impedance state.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,

preventing damaging current backflow through the device when it is powered down.

ORDERING INFORMATION

TA

PACKAGE†

SPEED

(ns)

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

QSOP – Q

Tape and reel

4.1

CY74FCT2245CTQCT

FCT2245

SOIC

SO

Tube

4.1

CY74FCT2245CTSOC

FCT2245

SOIC – SO

Tape and reel

4.1

CY74FCT2245CTSOCT

FCT2245

DIP – P

Tube

4.6

CY74FCT2245ATPC

74FCT2245ATPC

40

°Cto85°C

QSOP – Q

Tape and reel

4.6

CY74FCT2245ATQCT

FCT2245A

–40

°C to 85°C

SOIC

SO

Tube

4.6

CY74FCT2245ATSOC

FCT2245A

SOIC – SO

Tape and reel

4.6

CY74FCT2245ATSOCT

FCT2245A

QSOP – Q

Tape and reel

7.0

CY74FCT2245TQCT

FCT2245

SOIC

SO

Tube

7.0

CY74FCT2245TSOC

FCT2245

SOIC – SO

Tape and reel

7.0

CY74FCT2245TSOCT

FCT2245

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

Copyright

 2001, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

T/R

A0

A1

A2

A3

A4

A5

A6

A7

GND

VCC

OE

B0

B1

B2

B3

B4

B5

B6

B7

P, Q, OR SO PACKAGE

(TOP VIEW)