Data Selector/Multiplexers. 74AS258 Datasheet

74AS258 Selector/Multiplexers. Datasheet pdf. Equivalent

74AS258 Datasheet
Recommendation 74AS258 Datasheet
Part 74AS258
Description 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
Feature 74AS258; DM74AS257 • DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers September 1986 Revised Ma.
Manufacture Fairchild Semiconductor
Datasheet
Download 74AS258 Datasheet




Fairchild Semiconductor 74AS258
September 1986
Revised March 2000
DM74AS257 • DM74AS258
3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
General Description
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.
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 reg-
isters for data retention throughout the system.
Features
s Switching specifications at 50 pF
s Switching specifications guaranteed over full tempera-
ture and VCC range
s Advanced oxide-isolated, ion-implanted Schottky TTL
process
s Functionally and pin for pin compatible with Schottky,
low power Schottky, and advanced low power Schottky
TTL counterpart
s Improved AC performance over Schottky, low power
Schottky, and advanced low power Schottky counter-
parts
s 3-STATE buffer-type output drive bus lines directly
s Expand any data input point
s Multiplex dual data buses
s General four functions of two variables (one variable is
common)
s Source programmable counters
Ordering Code:
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
DM74AS258N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
INPUTS
OUTPUT
SELECT
CONTROL
A
H XX
L LL
L LH
L HX
LH
H = HIGH Level
L = LOW Level
X = Don't Care
Z = High Impedance (OFF)
X
OUTPUT Y
B AS257 AS258
XZ Z
XL H
XH
L
LLH
HH
L
© 2000 Fairchild Semiconductor Corporation DS006107
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Fairchild Semiconductor 74AS258
Logic Diagrams
DM74AS257
DM74AS258
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Fairchild Semiconductor 74AS258
Absolute Maximum Ratings(Note 1)
Supply Voltage, VCC
Input Voltage
Voltage Applied to Disabled Output
Operating Free Air Temperature Range
Storage Temperature Range
Typical θJA
N Package
7V
7V
5.5V
0°C to +70°C
65°C to +150°C
Note 1: 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 tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
75.0°C/W
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
Nom
Max
Units
4.5 5 5.5 V
2V
0.8 V
15 mA
48 mA
0 70 °C
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.
Symbol
Parameter
Conditions
Min Typ
Max
Units
VIK Input Clamp
Voltage
VOH HIGH Level
Output Voltage
VOL LOW Level
Output Voltage
VCC = 4.5V, II = −18 mA
VCC = 4.5V, IOH = Max
IOH = −2 mA, VCC = 4.5V to 5.5V
VCC = 4.5V, IOL = Max
2.4
VCC 2
3.2
0.35
1.2
0.5
V
V
V
V
II Input Current @
VCC = 5.5V, VIH = 7V
A, B, G
Max Input Voltage
Select
0.1
0.2
IIH HIGH Level
Input Current
VCC = 5.5V, VIH = 2.7V
A, B, G
Select
20
40
IIL LOW Level
Input Current
VCC = 5.5V, VIL = 0.4V
Select
All Others
1
0.5
IO (Note 2)
IOZH
IOZL
ICCH
Output Drive Current
Off-State Output Current,
HIGH Level Voltage Applied
Off-State Output Current,
LOW Level Voltage Applied
Supply
DM74AS257
Current
DM74AS258
VCC = 5.5V, VO = 2.25V
VCC = 5.5V
VO = 2.7V
VCC = 5.5V
VO = 0.4V
30
Outputs HIGH
12.9
8.8
112
50
50
19.7
13.5
ICCL
Supply
DM74AS257 VCC = 5.5V
Current
DM74AS258 Outputs Open
Outputs LOW
19
15.8
30.6
24.6
ICCZ
Supply
DM74AS257
Current
DM74AS258
Outputs Disabled
19.7
15.5
31.9
25.2
Note 2: The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
mA
µA
mA
mA
µA
µA
mA
mA
mA
mA
mA
mA
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