54FCT240
Octal Buffer/Line Driver with TRI-STATE®Outputs
General Description
The 54FCT240 is an octal buffer and line driver designed to
be employed as a memory address driver, clock driver and
bus oriented transmitter or receiver which provides improved
PC board density.
Features
nInverting TRI-STATE outputs drive bus lines or buffer
memory address registers
nOutput sink capability of 32 mA, source capability of 12
mA
nTTL input and output compatible levels
nCMOS power consumption
nStandard Microcircuit Drawing (SMD) 5962-8765501
Ordering Code:
Military Package Package Description
Number
54FCT240DMQB J20A 20-Lead Ceramic Dual-In-Line
54FCT240FMQB W20A 20-Lead Cerpak
54FCT240LMQB E20A 20-Lead Ceramic Leadless Chip Carrier, Type C
Logic Symbol
Pin Names Description
OE
1
,OE
2
TRI-STATE Output Enable Inputs
I
0
–I
7
Inputs
O
0
–O
7
Outputs
Connection Diagrams
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
FACT®is a registered trademark of Fairchild Semiconductor Corporation.
IEEE/IEC
DS100955-1
Pin Assignment
for DIP and Flatpak
DS100955-2
Pin Assignment
for LCC
DS100955-3
August 1998
54FCT240 Octal Buffer/Line Driver with TRI-STATE Outputs
© 1999 National Semiconductor Corporation DS100955 www.national.com
Connection Diagrams (Continued)
Inputs Outputs
OE
1
I
n
(Pins 12, 14, 16, 18)
LL H
LH L
HX Z
Inputs Outputs
OE
2
I
n
(Pins 3, 5, 7, 9)
LL H
LH L
HX Z
H
=
HIGH Voltage Level
L=LOW Voltage Level
X=Immaterial
Z=High Impedance
54FCT240
www.national.com 2
Absolute Maximum Ratings (Note 1)
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 (Note 1) −0.5V to +7.0V
Input Current (Note 1) −30 mA to +5.0 mA
Voltage Applied to Any Output
in the Disabled or
Power-off State −0.5V to 5.5V
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
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recom-
mend operation of FACT®circuits outside databook specifications.
DC Characteristics for ’FCT Family Devices
Symbol Parameter FCT240 Units V
CC
Conditions
Min Max
V
IH
Input HIGH Voltage 2.0 V Recognized HIGH Signal
V
IL
Input LOW Voltage 0.8 V Recognized LOW Signal
V
CD
Input Clamp Diode Voltage −1.2 V Min I
IN
=−18 mA
V
OH
Output HIGH
Voltage 54FCT 4.3 V Min I
OH
=−300 µA
54FCT 2.4 V Min I
OH
=−12 mA
V
OL
Output LOW
Voltage 54FCT 0.2 V Min I
OL
=300 µA
54FCT 0.5 V Min I
OL
=32 mA
I
IH
Input HIGH Current 5 µA Max V
IN
=5.5V
I
IL
Input LOW Current −5 µA Max V
IN
=0.0V
I
OZH
High Impedance Output Current 10 µA Max V
IN
=5.5V
I
OZL
High Impedance Output Current -10 µA Max V
IN
=0.0V
I
OS
Output Short-Circuit Current −60 mA Max V
OUT
=0.0V
I
CCQ
Power Supply Current 1.5 mA Max V
IN
= 0.2V or V
IN
= 5.3V
∆I
CC
Power Supply Current 2.0 mA Max V
IN
= 3.4V
I
CCT
Total Power Supply Current 4.8 mA Max V
IN
=3.4V or V
IN
= GND, OE =
GND, f
I
= 10Mhz, outputs open,
one bit toggling - 50%duty cycle
4.0 mA Max V
IN
=5.3V or V
IN
= 0.2V,OE =
GND, f
I
= 10Mhz, outputs open,
one bit toggling - 50%duty cycle
I
CCD
Dynamic I
CC
No Load 0.25 mA/MHz Max Outputs Open, OE =GND, One
Bit Toggling, 50%Duty Cycle
54FCT240
www.national.com3
AC Electrical Characteristics
Symbol Parameter 54FCT240 Units Fig.
No.
T
A
=−55˚C to +125˚C
V
CC
=4.5V–5.5V
C
L
=50 pF
Min Max
t
PLH
Propagation Delay 1.5 9.0 ns
t
PHL
Data to Outputs 1.5 9.0
t
PZH
Output Enable 1.5 10.5 ns
t
PZL
Time 1.5 10.5
t
PHZ
Output Disable 1.5 12.5 ns
t
PLZ
Time 1.5 12.5
Capacitance
Symbol Parameter Max Units Conditions
C
IN
Input Capacitance 10 pF V
CC
=OPEN
C
PD
Power Dissipation 12 pF V
CC
=5.0V
Capacitance
54FCT240
www.national.com 4
Physical Dimensions inches (millimeters) unless otherwise noted
20 Terminal Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
20 Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
54FCT240
www.national.com5
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
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure 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 is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
National Semiconductor
Europe Fax: +49 (0) 1 80-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 1 80-530 85 85
English Tel: +49 (0) 1 80-532 78 32
Français Tel: +49 (0) 1 80-532 93 58
Italiano Tel: +49 (0) 1 80-534 16 80
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: sea.support@nsc.com
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
www.national.com
20 Lead Ceramic Flatpak (F)
NS Package Number W20A
54FCT240 Octal Buffer/Line Driver with TRI-STATE Outputs
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.
