Texas Instruments CY74FCT2245TSOCT, CY74FCT2245TSOC, CY74FCT2245TQCT, CY74FCT2245TQC, CY74FCT2245CTSOCT Datasheet

8-Bit Transceive

r

CY74FCT2245T

SCCS037 - July 1994 - Revised March 2000

Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.

Copyright © 2000, Texas Instruments Incorporated

Features

• Function and pinout compatible with FCT and F logic

• 25Ωoutputseriesresistorstoreducetransmissionline

reflection noise

• FCT-C speed at 4.1 ns max.

FCT-A speed at 4.6 ns max.

• Edge-rate control circuitry for significantly improved

noise characteristics

• Power-off disable feature

• Fully compatible with TTL input and output logic levels

• ESD > 2000V

• Sink current 12 mA
Source current 15 mA

• Extended commercial temp. range of –40˚C to +85˚C

• Three-state outputs

Functional Description

The FCT2245T contains eight non-inverting, bidirectional buffers
with three-state outputs intended for bus oriented applications.
On-chip termination resistors have been added to the outputs to
reduce system noise caused by reflections. For this reason, the
FCT2245T can be used in an existing design to replace the
FCT245T .The FCT2245T current sinking capability is 12 mAat the
A and B ports.

The Transmit/Receive(T/

R) input determines the direction of data
flow through the bidirectional transceiver . T ransmit (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 a High Z
condition.

The outputs are designed with a power-off disable feature to
allow for live insertion of boards.

Function Table

[1]

Inputs

OutputOE T/R

L L Bus B Data to Bus A
L H Bus A Data to Bus B

H X High Z State

Note:

1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care.

Logic Block Diagram Pin Configurations

FCT2245T–1

A

0

A

1

A

2

A

3

A

4

A

5

A

6

A

7

OE

B

0

B

1

B

2

B

3

B

4

B

5

B

6

B

7

T/R

1
2
3
4
5
6
7
8
9
10

11

12

16

17

18

19

20

13

14

V

CC

FCT2245T–3

15

Top View

A

0

A

1

A

2

A

3

A

4

A

5

A

6

A

7

OE
B

0

B

1

B

2

B

3

B

4

B

5

B

6

B

7

T/R

GND

DIP/SOIC/QSOP

CY74FCT2245T

2

Maximum Ratings

[2,3]

(Above which the useful life may be impaired. For user guide­lines, not tested.)

Storage Temperature .................................–65°C to +150°C

Ambient Temperature with

Power Applied.............................................–65°C to +135°C

Supply Voltage to Ground Potential...............–0.5V to +7.0V

DC Input Voltage............................................–0.5V to +7.0V

DC Output Voltage......................................... –0.5V to +7.0V

DC Output Current (Maximum Sink Current/Pin) ......120 mA

Power Dissipation..........................................................0.5W

Static Discharge Voltage............................................>2001V

(per MIL-STD-883, Method 3015)

Operating Range

Range Range

Ambient

Temperature V

CC

Commercial T, AT, CT –40°C to +85°C 5V ± 5%

Electrical Characteristics Over the Operating Range

Parameter Description Test Conditions Min. Typ.

[5]

Max. Unit

V

OH

Output HIGH Voltage VCC=Min., IOH=–15 mA Com’l 2.4 3.3 V

V

OL

Output LOW Voltage VCC=Min., IOL=12 mA Com’l 0.3 0.55 V

R

OUT

Output Resistance VCC=Min., IOL=12 mA Com’l 20 25 40 Ω

V

IH

Input HIGH Voltage 2.0 V

V

IL

Input LOW Voltage 0.8 V

V

H

Hysteresis

[6]

All inputs 0.2 V

V

IK

Input Clamp Diode Voltage VCC=Min., IIN=–18 mA –0.7 –1.2 V

I

I

Input HIGH Current VCC=Max., VIN=V

CC

5 µA

I

IH

Input HIGH Current VCC=Max., VIN=2.7V ±1 µA

I

IL

Input LOW Current VCC=Max., VIN=0.5V ±1 µA

I

OS

Output Short Circuit Current

[7]

VCC=Max., V

OUT

=0.0V –60 –120 –225 mA

I

OFF

Power-Off Disable VCC=0V, V

OUT

=4.5V ±1 µA

Capacitance

[6]

Parameter Description Test Conditions Typ.

[5]

Max. Unit

C

IN

Input Capacitance 5 10 pF

C

OUT

Output Capacitance 9 12 pF

Notes:

2. Unless otherwise noted, these limits are over the operating free-air temperature range.

3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V

CC

or ground.

4. T

A

is the “instant on” case temperature.

5. Typical values are at V

CC

=5.0V, TA=+25˚C ambient.

6. This parameter is specified but not tested.

7. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of
a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, I

OS

tests should be performed last.

CY74FCT2245T

3

Power Supply Characteristics

Parameter Description Test Conditions Typ.

[5]

Max. Unit

I

CC

Quiescent Power Supply Current VCC=Max., VIN< 0.2V,

V

IN

> VCC–0.2V

0.1 0.2 mA

∆I

CC

Quiescent Power Supply Current
(TTL inputs)

VCC=Max., VIN=3.4V,

[8]

f1=0, Outputs Open

0.5 2.0 mA

I

CCD

Dynamic Power Supply
Current

[9]

VCC=Max., One Input Toggling,
50% Duty Cycle, Outputs Open,
T/

R=OE=GND,

V

IN

< 0.2V or VIN> VCC–0.2V

0.06 0.12 mA/MHz

I

C

Total Power Supply Current

[10]

VCC=Max., 50% Duty Cycle,
Outputs Open,
One Bit Toggling at f

1

=10 MHz,

T/

R=OE=GND,

V

IN

< 0.2V or VIN> VCC–0.2V

0.7 1.4 mA

VCC=Max.,
50% Duty Cycle, Outputs Open,
One Bit Toggling at f

1

=10 MHz,

T/

R=OE=GND,

V

IN

=3.4V or VIN=GND

1.0 2.4 mA

VCC=Max.,
50% Duty Cycle, Outputs Open,
Eight Bits Toggling at f

1

=2.5 MHz,

T/

R=OE=GND,

V

IN

< 0.2V or VIN> VCC–0.2V

1.3 2.6

[11]

mA

VCC=Max.,
50% Duty Cycle, Outputs Open,
Eight Bits Toggling at f

1

=2.5 MHz,

T/

R=OE=GND,

V

IN

=3.4V or VIN=GND

3.3 10.6

[11]

mA

Notes:

8. Per TTL driven input (V

IN

=3.4V); all other inputs at VCC or GND.

9. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.

10. I

C

=I

QUIESCENT

+ I

INPUTS

+ I

DYNAMIC

IC=ICC+∆ICCDHNT+I

CCD(f0

/2 + f1N1)

I

CC

= Quiescent Current with CMOS input levels

∆I

CC

= Power Supply Current for a TTL HIGH input (VIN=3.4V)

D

H

= Duty Cycle for TTL inputs HIGH

N

T

= Number of TTL inputs at D

H

I

CCD

= Dynamic Current caused by an input transition pair (HLH or LHL)

f

0

= Clock frequency for registered devices, otherwise zero

f

1

= Input signal frequency

N

1

= Number of inputs changing at f

1

All currents are in milliamps and all frequencies are in megahertz.

11. Values for these conditions are examples of the ICC formula. These limits are specified but not tested.

CY74FCT2245T

4

]

Switching Characteristics—Over the Operating Range

[12]

Parameter Description

FCT2245T FCT2245AT FCT2245CT

Unit

Fig.

No.

[13]

Commercial Commercial Commercial

Min. Max. Min. Max. Min. Max.

t

PLH

t

PHL

Propagation Delay
A

n

to Bn or Bn to A

n

1.5 7.0 1.5 4.6 1.5 4.1 ns 1, 3

t

PZH

t

PZL

Output Enable Time 1.5 9.5 1.5 6.2 1.5 5.8 ns 1, 7, 8

t

PHZ

t

PLZ

Output Disable Time 1.5 7.5 1.5 5.0 1.5 4.5 ns 1, 7, 8

Ordering Information—FCT2245T

Speed

(ns) Ordering Code

Package

Name Package Type

Operating

Range

4.1 CY74FCT2245CTQCT Q5 20-Lead (150-Mil) QSOP Commercial
CY74FCT2245CTSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC

4.6 CY74FCT2245ATPC P5 20-Lead (300-Mil) Molded DIP Commercial
CY74FCT2245ATQCT Q5 20-Lead (150-Mil) QSOP
CY74FCT2245ATSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC

7.5 CY74FCT2245TQCT Q5 20-Lead (150-Mil) QSOP Commercial
CY74FCT2245TSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC

Notes:

12. Minimum limits are specified but not tested on Propagation Delays.

13. See “Parameter Measurement Information” in the General Information section.

CY74FCT2245T

5

Package Diagrams

20-Lead (300-Mil) Molded DIP P5

20-Lead Quarter Size Outline

Q5

CY74FCT2245T

6

Package Diagrams (continued)

20-Lead (300-Mil) Molded SOIC

S5

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Copyright  2000, Texas Instruments Incorporated