NSC DM54S257 Tri-state quad 1 of 2 data selectors / multiplexer Datasheet

DM54S257/DM74S257, DM54S258/DM74S258
TRI-STATEÉ Quad 1 of 2 Data Selectors/Multiplexers
General Description
Features
These Schottky-clamped high-performance multiplexers
feature TRI-STATE outputs that can interface directly with
data lines of bus-organized systems. With all but one of the
common outputs disabled (at a high impedance state), the
low impedance of the single enabled output will drive the
bus line to a high or low logic level. To minimize the possibility that two outputs will attempt to take a common bus to
opposite logic levels, the output enable circuitry is designed
such that the output disable times are shorter than the output enable times.
This TRI-STATE output feature means that n-bit (paralleled)
data selectors with up to 258 sources can be implemented
for data buses. It also permits the use of standard TTL registers for data retention throughout the system.
Y
Y
Y
Y
Y
TRI-STATE versions S157, S158, with same pin-outs
Schottky-clamped for significant improvement in A-C
performance
Provides bus interface from multiple sources in highperformance systems
Average propagation delay from data input
S257 4.8 ns
S258 4 ns
Typical power dissipation
S257 320 mW
S258 280 mW
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
TL/F/6482 – 1
TL/F/6482 – 2
Order Number DM54S257J, DM54S258J, DM54S257W, DM74S257N or DM74S258N
See NS Package Number J16A, N16E or W16A
Function Table
Inputs
Output Y
Output
Control
Select
A
B
S257
S258
H
L
L
L
L
X
L
L
H
H
X
L
H
X
X
X
X
X
L
H
Z
L
H
L
H
Z
H
L
H
L
H e High Level, L e Low Level, X e Don’t Care
Z e High Impedance (off)
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C1995 National Semiconductor Corporation
TL/F/6482
RRD-B30M105/Printed in U. S. A.
DM54S257/DM74S257, DM54S258/DM74S258
TRI-STATE Quad 1 of 2 Data Selectors/Multiplexers
June 1989
Absolute Maximum Ratings (Note)
Note: The ‘‘Absolute Maximum Ratings’’ are those values
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.
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
b 55§ C to a 125§ C
DM54S
DM74S
0§ C to a 70§ C
b 65§ C to a 150§ C
Storage Temperature Range
Recommended Operating Conditions
Symbol
DM54S257
Parameter
DM74S257
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.75
5
5.25
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
0.8
0.8
V
IOH
High Level Output Current
b2
b 6.5
mA
IOL
Low Level Output Current
20
mA
TA
Free Air Operating Temperature
70
§C
2
V
2
V
20
b 55
125
0
’S257 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Symbol
Parameter
Min
Typ
(Note 1)
DM54
2.4
3.4
DM74
2.4
3.2
Conditions
Max
Units
b 1.2
V
VI
Input Clamp Voltage
VCC e Min, II e b18 mA
VOH
High Level Output
Voltage
VCC e Min, IOH e Max
VIL e Max, VIH e Min
VOL
Low Level Output
Voltage
VCC e Min, IOL e Max
VIH e Min, VIL e Max
II
Input Current @ Max
Input Voltage
VCC e Max, VI e 5.5V
IIH
High Level Input
Current
VCC e Max
VI e 2.7V
Select
100
Other
50
Low Level Input
Current
VCC e Max,
VI e 0.5V
Select
b4
Other
b2
Off-State Output Current
with High Level Output
Voltage Applied
VCC e Max, VO e 2.4V
VIH e Min, VIL e Max
50
mA
Off-State Output Current with
Low Level Output
Voltage Applied
VCC e Max, VO e 0.5V
VIH e Min, VIL e Max
b 50
mA
Short Circuit
Output Current
VCC e Max
(Note 2)
ICCH
Supply Current with Outputs High
VCC e Max (Note 3)
44
68
mA
ICCL
Supply Current with Outputs Low
VCC e Max (Note 3)
60
93
mA
Supply Current with Outputs Disabled
VCC e Max (Note 3)
64
99
mA
IIL
IOZH
IOZL
IOS
ICCZ
0.5
V
1
mA
DM54
b 40
b 100
DM74
b 40
b 100
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, and the duration should not exceed one second.
Note 3: ICC is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions.
2
V
mA
mA
mA
’S257 Switching Characteristics
at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load)
Symbol
RL e 280X
From (Input)
To (Output)
Parameter
CL e 15 pF
Min
CL e 50 pF
Max
Min
Units
Max
tPLH
Propagation Delay Time
Low to High Level Output
Data to
Output
7.5
11
ns
tPHL
Propagation Delay Time
High to Low Level Output
Data to
Output
6.5
10
ns
tPLH
Propagation Delay Time
Low to High Level Output
Select to
Output
15
16
ns
tPHL
Propagation Delay Time
High to Low Level Output
Select to
Output
15
16
ns
tPZH
Output Enable Time
to High Level Output
Output
Control to Y
19.5
23
ns
tPZL
Output Enable Time
to Low Level Output
Output
Control to Y
21
24
ns
tPHZ
Output Disable Time
to High Level Output (Note 1)
Output
Control to Y
8.5
ns
tPLZ
Output Disable Time
to Low Level Output (Note 1)
Output
Control to Y
14
ns
Note 1: CL e 5 pF.
Recommended Operating Conditions
Symbol
DM54S258
Parameter
DM74S258
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.75
5
5.25
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
0.8
0.8
V
IOH
High Level Output Current
b2
b 6.5
mA
IOL
Low Level Output Current
20
20
mA
70
§C
TA
2
Free Air Operating Temperature
2
b 55
125
V
V
0
’S258 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Symbol
VI
Parameter
Conditions
Min
Typ
(Note 1)
Max
Units
b 1.2
V
Input Clamp Voltage
VCC e Min, II e b18 mA
High Level Output
Voltage
VCC e Min, IOH e Max
VIL e Max, VIH e Min
VOL
Low Level Output
Voltage
VCC e Min, IOL e Max
VIH e Min, VIL e Max
II
Input Current @ Max
Input Voltage
VCC e Max, VI e 5.5V
IIH
High Level Input
Current
VCC e Max,
VI e 2.7V
Select
100
Other
50
Low Level Input
Current
VCC e Max,
VI e 0.5V
Select
b4
Other
b2
VOH
IIL
3
DM54
2.4
3.4
DM74
2.4
3.2
V
0.5
V
1
mA
mA
mA
’S258 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted) (Continued)
Symbol
IOZH
Parameter
Conditions
Min
Typ
(Note 1)
Max
Units
Off-State Output Current
with High Level Output
Voltage Applied
VCC e Max, VO e 2.4V
VIH e Min, VIL e Max
50
mA
Off-State Output Current with
Low Level Output
Voltage Applied
VCC e Max, VO e 0.5V
VIH e Min, VIL e Max
b 50
mA
Short Circuit
Output Current
VCC e Max
(Note 2)
ICCH
Supply Current with
Outputs High
VCC e Max
(Note 3)
36
56
mA
ICCL
Supply Current with
Outputs Low
VCC e Max
(Note 3)
52
81
mA
ICCZ
Supply Current with
Outputs Disabled
VCC e Max
(Note 3)
56
87
mA
IOZL
IOS
DM54
b 40
b 100
DM74
b 40
b 100
mA
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, and the duration should not exceed one second.
Note 3: ICC is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions.
’S258 Switching Characteristics
at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
RL e 280X
CL e 15 pF
Min
Max
CL e 50 pF
Min
Units
Max
tPLH
Propagation Delay Time
Low to High Level Output
Data to
Output
6
9
ns
tPHL
Propagation Delay Time
High to Low Level Output
Data to
Output
6
9
ns
tPLH
Propagation Delay Time
Low to High Level Output
Select to
Output
12
15
ns
tPHL
Propagation Delay Time
High to Low Level Output
Select to
Output
12
15
ns
tPZH
Output Enable Time
to High Level Output
Output
Control to Y
19.5
23
ns
tPZL
Output Enable Time
to Low Level Output
Output
Control to Y
21
24
ns
tPHZ
Output Disable Time
to High Level Output (Note 1)
Output
Control to Y
8.5
ns
tPLZ
Output Disable Time
to Low Level Output (Note 1)
Output
Control to Y
14
ns
Note 1: CL e 5 pF.
4
Logic Diagrams
S257
TL/F/6482 – 3
S258
TL/F/6482 – 4
5
6
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Numbers DM54S257J or DM54S258J
NS Package Number J16A
16-Lead Molded Dual-In-Line Package (N)
Order Numbers DM74S257N or DM74S258N
NS Package Number N16E
7
DM54S257/DM74S257, DM54S258/DM74S258
TRI-STATE Quad 1 of 2 Data Selectors/Multiplexers
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number DM54S257W
NS Package Number W16A
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