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June 1989
54125 DM54125 DM74125
Quad TRI-STATE Buffers
General Description
This device contains four independent gates each of which
performs a non-inverting buffer function The outputs have
the TRI-STATE feature When enabled the outputs exhibit
the low impedance characteristics of a standard TTL output
with additional drive capability at the high Logic level to per-
mit the driving of bus lines without external pull-up resistors
When disabled both the output transistors are turned off
presenting a high-impedance state to the bus line Thus the
output will act neither as a significant load nor as a driver
To minimize the possibility that two outputs will attempt to
take a common bus to opposite logic levels the disable time
is shorter than the enable time of the outputs
Features
Y Alternate Military Aerospace device (54125) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
TL F 6540 – 1
Order Number 54125DMQB 54125FMQB DM54125J DM54125W or DM74125N
See NS Package Number J14A N14A or W14B
Function Table
YeA
Inputs
Output
AC
Y
LL
HL
XH
L
H
Hi-Z
H e High Logic Level
L e Low Logic Level
X e Either Low or High Logic Level
Hi-Z e TRI-STATE (Outputs are disabled)
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 6540
RRD-B30M105 Printed in U S A

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Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
5 5V
Operating Free Air Temperature Range
DM54 and 54
b55 C to a125 C
DM74
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Min
45
2
b55
DM54125
Nom
5
Max
55
08
b2
16
125
Min
4 75
2
0
DM74125
Nom
5
Max
5 25
08
b5 2
16
70
Units
V
V
V
mA
mA
C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
VOH
VOL
II
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
Input Current Max
Input Voltage
VCC e Min II e b12 mA
VCC e Min IOH e Max
VIL e Max VIH e Min
VCC e Min IOL e Max
VIH e Min VIL e Max
VCC e Max VI e 5 5V
24
IIH
High Level Input Current
VCC e Max VI e 2 4V
IIL
Low Level Input Current
VCC e Max VI e 0 4V
IIZL
Off-State Input Current
VCC e Max VI e 0 4V
with Low Level Input
Voltage Applied
IOZH
Off-State Output Current
with High Level Output
Voltage Applied
VCC e Max VO e 2 4V
VIH e Min VIL e Max
IOZL
Off-State Output Current
with Low Level Output
Voltage Applied
VCC e Max VO e 0 4V
VIH e Min VIL e Max
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b30
b28
ICC Supply Current
VCC e Max (Note 3)
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time
Note 3 ICC is measured with the output control (C) inputs at 4 5V the data inputs grounded and the outputs open
Typ
(Note 1)
33
02
36
Max
b1 5
04
1
40
b1 6
b40
40
b40
b70
b70
54
Units
V
V
V
mA
mA
mA
mA
mA
mA
mA
mA
2

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Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
RL e 400X
CL e 5 pF
CL e 50 pF
Min Max Min Max
Units
tPLH
Propagation Delay Time
Low to High Level Output
15 ns
tPHL
Propagation Delay Time
High to Low Level Output
18 ns
tPZH
Output Enable Time to
High Level Output
18 ns
tPZL Output Enable Time to
Low Level Output
25 ns
tPHZ
Output Disable Time from
High Level Output
8
ns
tPLZ Output Disable Time from
Low Level Output
14
ns
Physical Dimensions inches (millimeters)
14-Lead Ceramic Dual-In-Line Package (J)
Order Number 54125DMQB or DM54125J
NS Package Number J14A
3

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Physical Dimensions inches (millimeters) (Continued)
14-Lead Molded Dual-In-Line Package (N)
Order Number DM74125N
NS Package Number N14A
14-Lead Ceramic Flat Package (W)
Order Number 54125FMQB or DM54125W
NS Package Number W14B
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