National Semiconductor 54173, DM54173, DM74173 Technical data
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54173/DM54173/DM74173
TRI-STATE
General Description
These four-bit registers contain D-type flip-flops with totempole TRI-STATE outputs, capable of driving highly capacitive or low-impedance loads. The high-impedance state and
increased high-logic-level drive provide these flip-flops with
the capability of driving the bus lines in a bus-organized system without need for interface or pull-up components.
Gated enable inputs are provided for controlling the entry of
data into the flip-flops. When both data-enable inputs are
low, data at the D inputs are loaded into their respective flipflops on the next positive transition of the buffered clock
input. Gate output control inputs are also provided. When
both are low, the normal logic states of the four outputs are
available for driving the loads or bus lines. The outputs are
disabled independently from the level of the clock by a high
logic level at either output control input. The outputs then
present a high impedance and neither load nor drive the bus
line. Detailed operation is given in the function table.
Quad D Registers
É
June 1989
To minimize the possibility that two outputs will attempt to
take a common bus to opposite logic levels, the output control circuitry is designed so that the average output disable
times are shorter than the average output enable times.
Features
Y
TRI-STATE outputs interface directly with system bus
Y
Gated output control lines for enabling or disabling the
outputs
Y
Fully independent clock elminates restrictions for operating in one of two modes:
Parallel load
Do nothing (hold)
Y
For application as bus buffer registers
Y
Typical propagation delay 18 ns
Y
Typical frequency 30 MHz
Y
Typical power dissipation 250 mW
Y
Alternate Military/Aerospace device (54173) is available. Contact a National Semiconductor Sales Office/
Distributor for specifications.
54173/DM54173/DM74173 TRI-STATE Quad D Registers
Connection Diagram
Dual-In-Line Package
Order Number 54173DMQB, 54173FMQB,
DM54173J, DM54173W or DM74173N
See NS Package Number J16A, N16E or W16A
TRI-STATEÉis a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
TL/F/6556
TL/F/6556– 1
Function Table
Inputs
Clear Clock
HX X X X L
LL X X XQ
L
u
L
u
L
u
L
u
When either M or N (or both) is (are) high the output is disabled to the
high-impedance state; however, sequential operation of the flip-flops is
not affected.
Hehigh level (steady state)
e
L
low level (steady state)
e
low-to-high level transition
u
e
X
don’t care (any input including transitions)
e
Q
the level of Q before the indicated steady state input conditions were
0
established
Data Enable
G1 G2
HXXQ
XHXQ
LLLL
LLHH
Data
D
Output
Q
0
0
0
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
DM74 0
Storage Temperature Range
b
55§Ctoa125§C
Ctoa70§C
§
b
65§Ctoa150§C
Recommended Operating Conditions
Symbol Parameter
V
V
V
I
OH
I
OL
f
CLK
t
W
t
SU
t
H
t
REL
T
CC
IH
IL
A
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
High Level Input Voltage 2 2 V
Low Level Input Voltage 0.8 0.8 V
High Level Output Current
Low Level Output Current 16 16 mA
Clock Frequency (Note 4) 0 25 0 25 MHz
Pulse Width Clock 20 20
(Note 4)
Clear 20 20
Setup Time Enable 17 17
(Note 4)
Data 10 10
Hold Time Enable 2 2
(Note 4)
Data 10 10
Clear Release Time (Note 4) 10 10 ns
Free Air Operating Temperature
Min Nom Max Min Nom Max
b
55 125 0 70
The ‘‘Absolute Maximum Ratings’’ are those values
Note:
beyond which the safety of the device cannot be guaranteed. 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.
DM54173 DM74173
b
2
b
5.2 mA
Units
ns
ns
ns
C
§
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
e
V
I
V
OH
V
OL
I
I
I
IH
I
IL
I
OZH
I
OZL
I
OS
I
CC
Note 1: All typicals are at V
Note 2: Not more than one output should be shorted at a time.
Note 3: I
input and M input at 4.5V.
Note 4: T
Input Clamp Voltage V
High Level Output V
Voltage V
Low Level Output V
Voltage V
Input Current@Max V
Input Voltage
High Level Input Current V
Low Level Input Current V
Off-State Output Current with High V
Level Output Voltage Applied V
Off-State Output Current with Low V
Level Output Voltage Applied V
Short Circuit V
Output Current (Note 2)
Supply Current V
e
e
5V, T
5V.
25§C.
A
CC
is measured with all outputs open, CLEAR grounded after a momentary connection to 4.5V: N, G1, G2 and all DATA inputs grounded: and the CLOCK
CC
e
A
25§C and V
e
CC
CC
CC
IL
CC
IH
CC
CC
CC
CC
IH
CC
IH
CC
CC
e
e
e
e
eb
Min, I
e
Min, I
Max, V
e
Min, I
Min, V
e
Max, V
e
Max, V
e
Max, V
e
Max, V
Min, V
e
Max, V
Min, V
e
Max DM54
e
Max (Note 3) 50 72 mA
12 mA
I
e
Max
OH
e
Min
IH
e
Max
OL
e
Max
IL
e
5.5V
I
e
2.4V 40 mA
I
e
0.4V
I
e
2.4V
O
e
Max
IL
e
0.4V
O
e
Max
IL
DM74
2.4 V
b
b
2
Typ
(Note 1)
Max Units
b
1.5 V
0.4 V
1mA
b
1.6 mA
40 mA
b
40 mA
30
30
b
70
b
70
mA
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