Texas Instruments CY74FCT2541CTSOCT, CY74FCT2541CTSOC, CY74FCT2541CTQCT, CY74FCT2541CTQC, CY74FCT2541ATSOCT Datasheet

8-Bit Buffer/Line Drive

r

CY74FCT2541T

SCCS041 - September 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

• FCT-C speed at 4.1 ns max.

FCT-A speed at 4.8 ns max.

• 25Ωoutputseriestoreducetransmissionlinereflection

noise

• Reduced V

OH

(typically = 3.3V) versions of equivalent

FCT functions

• Edge-rate control circuitry for significantly improved

noise characteristics

• Power-off disable feature

• ESD > 2000V

• Matched rise and fall times

• Fully compatible with TTLinput andoutput logic levels

• Sink current 12 mA
Source current 15 mA

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

• Three-state outputs

Functional Description

The FCT2541T is an octal buffer and line driver designed
to be employed as a memory address dr iver, clock dr iver,
andbus-oriented transmitter/receiv er .On-chiptermination resistors
havebeen addedto the outputs to reducesystem noisecaused by
reflections.The FCT2541Tcan beused toreplacethe FCT541Tto
reduce noisein an existingdesign. The speed ofthe FCT2541T is
comparableto bipolar logiccounterpartswhile reducing powerdis­sipation. The input and output voltage lev els allow direct interface
with TTL and CMOS devices without e xternal components.

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

]

Logic Block Diagram

Pin Configurations

1
2
3

4
5
6
7
8
9
10 11

12

16

17

18

19

20

13

14

V

CC

FCT2541T–2

15

SOIC/QSOP

Top View

GND

FCT2541T

–3

O

0

D

1

D

2

D

3

D

4

D

5

D

6

D

7

D

0

O

1

O

2

O

3

O

4

O

5

O

6

O

7

OE

B

OE

A

O

0

D

1

D

2

D

3

D

4

D

5

D

6

D

7

D

0

O

1

O

2

O

3

O

4

O

5

O

6

O

7

OE

B

OE

A

Function Table

[1]

Inputs

OutputOE

A

OE

B

D

L
L

H

L
L

H

L
H
X

L
H
Z

Note:

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

CY74FCT2541T

2

Maximum Ratings

[2,3]

(Above which theuseful 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

Ambient

Temperature V

CC

Commercial −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 2.4 3.3 V

V

OL

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

R

OUT

Output Resistance VCC= Min., IOL= 12 mA 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

OZH

Off State HIGH-Level
Output Current

VCC= Max., V

OUT

= 2.7V 15 µA

I

OZL

Off State LOW-Level
Output Current

VCC = Max., V

OUT

= 0.5V −15 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 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. TA is the “instant on” case temperature.

5. Typical values are at VCC=5.0V, TA=+25˚C ambient.

6. This parameter is specified but not tested.

7. Not more thanone output shouldbeshorted ata time. Duration of shortshould not exceedone second. The useof high-speed testapparatus 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 outputmayraisethe chip temperature wellabovenormaland thereby cause invalidreadings in otherparametrictests.In any sequence ofparameter
tests, IOS tests should be performed last.

CY74FCT2541T

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., 50% Duty Cycle, Outputs Open,
One Bit Toggling,
OEA=OEB=GND, VIN≤0.2V or
V

IN≥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,

OEA=OEB=GND, VIN≤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,

OEA=OEB=GND, VIN=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,

OEA=OEB=GND, VIN≤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,

OEA=OEB=GND, VIN=3.4V or VIN=GND

3.3 10.6

[11]

mA

Switching Characteristics Over the Operating Range

[12]

Parameter Description

CY74FCT2541T CY74FCT2541AT CY74FCT2541AT Unit

Fig.

No.

[13]

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

t

PLH

t

PHL

Propagation Delay
Data to Output

1.5 8.0 1.5 4.8 1.5 4.1 ns 1, 3

t

PZH

t

PZL

Output Enable Time 1.5 10.0 1.5 6.2 1.5 5.8 ns 1, 7, 8

t

PHZ

t

PLZ

Output Disable Time 1.5 9.5 1.5 5.6 1.5 5.2 ns 1, 7, 8

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.

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

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

CY74FCT2541T

4

Ordering Information

Speed

(ns) Ordering Code

Package

Name Package Type

Operating

Range

4.1 CY74FCT2541CTQCT Q5 20-Lead (150-Mil) QSOP Commercial
CY74FCT2541CTSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC

4.8 CY74FCT2541ATQCT Q5 20-Lead (150-Mil) QSOP Commercial
CY74FCT2541ATSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC

8.0 CY74FCT2541TQCT Q5 20-Lead (150-Mil) QSOP Commercial
CY74FCT2541TSOC/SOCT S5 20-Lead (300-Mil) Molded SOIC

Document #: 38−00342−A

CY74FCT2541T

5

Package Diagrams

20-Lead Quarter Size Outline Q5

20-Lead (300-Mil) Molded SOIC

S5

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Copyright  2000, Texas Instruments Incorporated