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54FCT245FMQB中文资料

54FCT245

Octal Bidirectional Transceiver with TRI-STATE ?Outputs

General Description

The ’FCT245contains eight non-inverting bidirectional buff-ers with TRI-STATE outputs and is intended for bus-oriented applications.Current sinking capability is 48mA on both the A and B ports.The Transmit/Receive (T/R)input determines the direction of data flow through the bidirectional trans-ceiver.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 input,when HIGH,disables both A and B ports by placing them in a High Z condition.

Features

n TTL input and output level compatible

n A and B output sink capability of 48mA,source capability of 12mA

n CMOS power consumption

n Standard Microcircuit Drawing (SMD)5962-8762901

Ordering Code:

Military Package Package Description

Number 54FCT245DMQB J20A 20-Lead Ceramic Dual-In-Line 54FCT245FMQB W20A 20-Lead Cerpak

54FCT245LMQB

E20A

20-Lead Ceramic Leadless Chip Carrier,Type C

Logic Symbol

TRI-STATE ?is a registered trademark of National Semiconductor Corporation.

DS100950-1

August 1998

54FCT245Octal Bidirectional Transceiver with TRI-STATE Outputs

?1998National Semiconductor Corporation https://www.wendangku.net/doc/3c4612197.html,

Connection Diagrams

Pin Descriptions

Pin Names Description

OE Output Enable Input (Active LOW)T/R Transmit/Receive Input

A 0–A 7Side A Inputs or TRI-STATE Outputs

B 0–B 7

Side B Inputs or TRI-STATE Outputs

Truth Table

Inputs Output

OE T/R L L Bus B Data to Bus A L H Bus A Data to Bus B H

High Z State

H =HIGH Voltage Level L =LOW Voltage Level X =Immaterial

Logic Diagram

Pin Assignment for DIP

and Flatpak.

DS100950-5

Pin Assignment for LCC

DS100950-4

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Absolute Maximum Ratings(Note1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Storage Temperature?65?C to+150?C Ambient Temperature under Bias?55?C to+125?C Junction Temperature under Bias

Ceramic?55?C to+175?C V CC Pin Potential to

Ground Pin?0.5V to+7.0V Input Voltage(Note2)?0.5V to+7.0V Input Current(Note2)?30mA to+5.0mA Voltage Applied to Any Output

in the Disabled or

Power-off State?0.5V to5.5V

in the HIGH State?0.5V to V CC Current Applied to Output

in LOW State(Max)twice the rated I OL(mA) Recommended Operating Conditions

Free Air Ambient Temperature

Military?55?C to+125?C Supply Voltage

Military+4.5V to+5.5V Note1:Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired.Functional operation under these conditions is not implied.

Note2:Either voltage limit or current limit is sufficient to protect inputs.

DC Electrical Characteristics

Symbol Parameter FCT245

Units V CC Conditions

Min Max

V IH Input HIGH Voltage 2.0V Recognized HIGH Signal V IL Input LOW Voltage0.8V Recognized LOW Signal V CD Input Clamp Diode Voltage?1.2V Min I IN=?18mA(OE,T/R)

V OH Output HIGH

Voltage 54FCT 4.3V Min I OH=?300uA(A n,B n) 54FCT 2.4V Min I OH=?12mA(A n,B n)

V OL Output LOW

Voltage 54FCT0.2V Min I OL=300uA(A n,B n) 54FCT0.55V Min I OL=48mA(A n,B n)

I IH Input HIGH Current5

μA Max V IN=2.7V(OE,T/R)

5V IN=V CC(OE,T/R)

I BVIT Input HIGH Current Breakdown Test

(I/O)20μA Max

V IN=5.5V(A n,B n)

I IL Input LOW Current?5μA Max V IN=0.0V(OE,T/R) I OS Output Short-Circuit Current?60mA Max V OUT=0.0V(A n,B n)

I CCQ Power Supply Current

1.5mA Max V IN=0.2V or V IN=5.3V,V CC= 5.5V

?I CC Power Supply Current 2.0mA Max V CC=5.5V,V IN=3.4V

I CCT Total Power Supply Current

6.0mA V IN=3.4V or V IN=GND,OE= T/R=GND,V CC=5.5V,f I=

10Mhz,outputs open,one bit toggling-50%duty cycle

5.5mA Max V IN=5.3V or V IN=0.2V,OE= T/R=GND,V CC=5.5V,f I= 10Mhz,outputs open,one bit toggling-50%duty cycle

I CCD Dynamic I CC

(Note3)0.4mA/

MHz

Max

Outputs Open,OE=GND,T/R=

GND or V CC One Bit Toggling,

50%Duty Cycle

Note3:Guaranteed but not tested.

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AC Electrical Characteristics

Symbol

Parameter

54FCT

Units

Fig.No.

T A =?55?C to +125?C V CC =4.5V–5.5V

C L =50pF

Min

Max t PLH Propagation Delay 1.57.5ns Figure 4t PHL Data to Outputs 1.57.5t PZH Output Enable 1.510.0ns Figure 5t PZL Time

1.510.0t PHZ Output Disable 1.510.0ns Figure 5

t PLZ

Time

1.5

10.0

Capacitance

Symbol

Parameter

Max Units Conditions T A =25?C

C IN

Input Capacitance 10.0pF V CC =0V (OE ,T/R)C I/O (Note 4)

I/O Capacitance

12.0

V CC =5.0V (A n ,B n )

Note 4:C I/O is measured at frequency f =1MHz,per MIL-STD-883B,Method 3012.

AC Loading

DS100950-6

*Includes jig and probe capacitance

FIGURE 1.Standard AC Test Load

DS100950-7

FIGURE 2.Test Input Signal Levels

Amplitude Rep.Rate t w t r t f 3.0V

1MHz

500ns

2.5ns

FIGURE 3.Test Input Signal Requirements

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AC Waveforms

DS100950-8

FIGURE 4.Propagation Delay Waveforms for Inverting and Non-Inverting Functions

DS100950-10

FIGURE 5.TRI-STATE Output HIGH and LOW Enable and Disable Times

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Physical Dimensions inches(millimeters)unless otherwise noted

20-Terminal Ceramic Chip Carrier(L)

NS Package Number E20A

20-Lead Ceramic Dual-In-Line Package(D)

NS Package Number J20A

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Physical Dimensions inches(millimeters)unless otherwise noted(Continued)

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI-CONDUCTOR CORPORATION.As used herein:

1.Life support devices or systems are devices or sys-

tems which,(a)are intended for surgical implant into

the body,or(b)support or sustain life,and whose fail-

ure to perform when properly used in accordance

with instructions for use provided in the labeling,can

be reasonably expected to result in a significant injury

to the user.

2.A critical component in any component of a life support

device or system whose failure to perform can be rea-

sonably expected to cause the failure of the life support

device or system,or to affect its safety or effectiveness.

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Corporation

Americas

Tel:1-800-272-9959

Fax:1-800-737-7018

Email:support@https://www.wendangku.net/doc/3c4612197.html,

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Fax:+49(0)180-5308586

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Tel:65-2544466

Fax:65-2504466

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Japan Ltd.

Tel:81-3-5620-6175

Fax:81-3-5620-6179

20-Lead Ceramic Flatpak(F)

NS Package Number W20A

National does not assume any responsibility for use of any circuitry described,no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.