Fairchild DM74AS258M 3-state quad 1 of 2 line data selector/multiplexer Datasheet

DM74AS257, DM74AS258
3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
Features
General Description
■ Switching specifications at 50pF
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four
3-STATE outputs that can interface directly with data
lines of bus-organized systems. A 4-bit word selected
from one of two sources is routed to the four outputs.
The DM74AS257 presents true data whereas the
DM74AS258 presents inverted data to minimize propagation delay time.
■ Switching specifications guaranteed over full
temperature and VCC range
■ Advanced oxide-isolated, ion-implanted Schottky
TTL process
■ Functionally and pin for pin compatible with Schottky,
■
■
■
■
■
■
low power Schottky, and advanced low power
Schottky TTL counterpart
Improved AC performance over Schottky, low power
Schottky, and advanced low power Schottky
counterparts
3-STATE buffer-type output drive bus lines directly
Expand any data input point
Multiplex dual data buses
General four functions of two variables (one variable
is common)
Source programmable counters
tm
This 3-STATE output feature means that n-bit (paralleled) data selectors with up to 300 sources can be
implemented for data buses. It also permits the use of
standard TTL registers for data retention throughout the
system.
Ordering Information
Order
Number
Package
Number
Package Description
DM74AS257M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
DM74AS257N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
DM74AS258M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number.
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
www.fairchildsemi.com
DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
May 2007
Function Table
Inputs
OUTPUT
Control Select
Output Y
A
B
X
X
H
X
L
L
L
L
L
H
L
H
X
L
H
X
AS257 AS258
Z
Z
X
L
H
X
H
L
L
L
H
H
H
L
H = HIGH Level
L = LOW Level
X = Don't Care
Z = High Impedance (OFF)
Logic Diagrams
DM74AS257
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
DM74AS258
www.fairchildsemi.com
2
DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
Connection Diagram
Symbol
VCC
VI
Parameter
Rating
Supply Voltage
7V
Input Voltage
7V
Voltage Applied to Disabled Output
TA
TSTG
θJA
5.5V
Operating Free Air Temperature Range
0°C to +70°C
Storage Temperature Range
–65°C to +150°C
Typical Thermal Resistance, N Package
75.0°C/W
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
Parameter
Min.
Nom.
Max.
Units
4.5
5
5.5
V
VCC
Supply Voltage
VIH
HIGH Level Input Voltage
VIL
LOW Level Input Voltage
0.8
V
IOH
HIGH Level Output Current
–15
mA
48
mA
70
°C
IOL
LOW Level Output Current
TA
Free Air Operating Temperature
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
2
0
V
www.fairchildsemi.com
3
DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.
Symbol
Parameter
Conditions
VIK
Input Clamp Voltage
VCC = 4.5V, II = –18 mA
VOH
HIGH Level Output Voltage
VCC = 4.5V, IOH = Max
IOH = –2 mA, VCC = 4.5V to 5.5V
VOL
LOW Level Output Voltage
VCC = 4.5V, IOL = Max
II
Input Current @ Max. Input
Voltage
VCC = 5.5V, VIH = 7V
HIGH Level Input Current
VCC = 5.5V, VIH = 2.7V A, B, G
IIH
Min.
Typ.
2.4
3.2
LOW Level Input Current
VCC = 5.5V, VIL = 0.4V
Output Drive Current
VCC = 5.5V, VO = 2.25V
IOZH
Off-State Output Current,
HIGH Level Voltage Applied
IOZL
ICCH
0.35
V
0.5
V
0.1
mA
Select
0.2
20
µA
40
Select
–1
mA
–0.5
–30
mA
VCC = 5.5V, VO = 2.7V
–50
µA
Off-State Output Current,
LOW Level Voltage Applied
VCC = 5.5V, VO = 0.4V
–50
µA
Supply Current DM74AS257
VCC = 5.5V,
Outputs Open
12.9
19.7
mA
8.8
13.5
Outputs HIGH
Supply Current DM74AS257
Outputs LOW
DM74AS258
ICCZ
V
–112
DM74AS258
ICCL
–1.2
A, B, G
All Others
IO(1)
Units
VCC – 2
Select
IIL
Max.
Supply Current DM74AS257
Outputs
Disabled
DM74AS258
19
30.6
15.8
24.6
19.7
31.9
15.5
25.2
mA
mA
Note:
1. The output conditions have been chosen to produce a current that closely approximates one half of the true
short-circuit output current, IOS.
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
www.fairchildsemi.com
4
DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
Electrical Characteristics
Over recommended operating free air temperature range.
Symbol
Parameter
tPLH
Propagation Delay Time,
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time,
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time,
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time,
HIGH-to-LOW Level Output
tPZH
Output Enable Time to HIGH
Level
tPZL
Output Enable Time to LOW
Level
tPHZ
Output Disable Time from HIGH
Level
tPLZ
Output Disable Time from LOW
Level
Conditions
From
To
Min
Max
Units
VCC = 4.5V to 5.5V,
CL = 50 pF,
RL = 500Ω
Data
Any Y
1
5.5
ns
1
6
ns
2
11
ns
2
10
ns
2
7.5
ns
2
9.5
ns
1.5
6.5
ns
2
7
ns
Select
OUTPUT
Control
OUTPUT
Control
Any Y
Any Y
Any Y
DM74AS258 Switching Characteristics
Over recommended operating free air temperature range.
Symbol
Parameter
tPLH
Propagation Delay Time,
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time,
HIGH-to-LOW Level Output
tPLH
Propagation Delay Time,
LOW-to-HIGH Level Output
tPHL
Propagation Delay Time,
HIGH-to-LOW Level Output
tPZH
Output Enable Time to HIGH
Level
tPZL
Output Enable Time to LOW
Level
tPHZ
Output Disable Time, from HIGH
Level
tPLZ
Output Disable Time from LOW
Level
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
Conditions
From
To
Min.
Max.
Units
VCC = 4.5V to 5.5V,
CL = 50pF,
RL = 500Ω
Data
Any Y
1
5
ns
1
4
ns
2
9.5
ns
2
10
ns
2
8
ns
2
10
ns
1.5
6
ns
2
6.5
ns
Select
OUTPUT
Control
OUTPUT
Control
Any Y
Any Y
Any Y
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5
DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
DM74AS257 Switching Characteristics
DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
Physical Dimensions
Dimensions are in millimeters unless otherwise noted.
Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Package Number M16A
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
www.fairchildsemi.com
6
DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
Physical Dimensions (Continued)
Dimensions are in inches (millimeters) unless otherwise noted.
Figure 2. 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Package Number N16E
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
www.fairchildsemi.com
7
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or In Design
This datasheet contains the design specifications for product development.
Specifications may change in any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data; supplementary data will be
published at a later date. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve design.
No Identification Needed
Full Production
This datasheet contains final specifications. Fairchild Semiconductor reserves
the right to make changes at any time without notice to improve design.
Obsolete
Not In Production
This datasheet contains specifications on a product that has been
discontinued by Fairchild semiconductor. The datasheet is printed for
reference information only.
Rev. I28
©1986 Fairchild Semiconductor Corporation
DM74AS257, DM74AS258 Rev. 1.2
www.fairchildsemi.com
8
DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
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