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DM74AS258M

P1-P3P4-P6
© 2000 Fairchild Semiconductor Corporation DS006107 www.fairchildsemi.com
September 1986
Revised March 2000
DM74AS257 • DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
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
■ Switching specifications at 50 pF
■ Switching specifications guaranteed over full tempera-
ture and V
CC
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 counter-
parts
■ 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
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Function Table
H = HIGH Level
L = LOW Level
X = Don't Care
Z = High Impedance (OFF)
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
INPUTS OUTPUT Y
OUTPUT
SELECT A B AS257 AS258
CONTROL
HXXXZZ
LLLXLH
LLHXHL
LHXLLH
LHXHHL
www.fairchildsemi.com 2
DM74AS257 • DM74AS258
Logic Diagrams
DM74AS257 DM74AS258
3 www.fairchildsemi.com
DM74AS257 • DM74AS258
Absolute Maximum Ratings(Note 1)
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.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at V
CC
= 5V, T
A
= 25°C.
Note 2: The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
OS
.
Supply Voltage, V
CC
7V
Input Voltage 7V
Voltage Applied to Disabled Output 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Typical θ
JA
N Package 75.0°C/W
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.5 5 5.5 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current −15 mA
I
OL
LOW Level Output Current 48 mA
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
V
IK
Input Clamp
V
CC
= 4.5V, I
I
= −18 mA −1.2 V
Voltage
V
OH
HIGH Level V
CC
= 4.5V, I
OH
= Max 2.4 3.2 V
Output Voltage I
OH
= −2 mA, V
CC
= 4.5V to 5.5V V
CC
− 2V
V
OL
LOW Level
V
CC
= 4.5V, I
OL
= Max 0.35 0.5 V
Output Voltage
I
I
Input Current @ V
CC
= 5.5V, V
IH
= 7V
A, B, G
0.1
mA
Max Input Voltage Select 0.2
I
IH
HIGH Level V
CC
= 5.5V, V
IH
= 2.7V
A, B, G
20
µA
Input Current Select 40
I
IL
LOW Level V
CC
= 5.5V, V
IL
= 0.4V Select −1
mA
Input Current All Others −0.5
I
O
(Note 2) Output Drive Current V
CC
= 5.5V, V
O
= 2.25V −30 −112 mA
I
OZH
Off-State Output Current, V
CC
= 5.5V −50 µA
HIGH Level Voltage Applied V
O
= 2.7V
I
OZL
Off-State Output Current, V
CC
= 5.5V
−50 µA
LOW Level Voltage Applied V
O
= 0.4V
I
CCH
Supply DM74AS257 Outputs HIGH 12.9 19.7 mA
Current DM74AS258 8.8 13.5 mA
I
CCL
Supply DM74AS257 V
CC
= 5.5V Outputs LOW 19 30.6 mA
Current DM74AS258 Outputs Open 15.8 24.6 mA
I
CCZ
Supply DM74AS257 Outputs Disabled 19.7 31.9 mA
Current DM74AS258 15.5 25.2 mA
P1-P3P4-P6

DM74AS258M

Mfr. #:
Buy DM74AS258M
Manufacturer:
ON Semiconductor
Description:
IC DATA SELECTOR/MUX 2-1 16SOIC
Lifecycle:
New from this manufacturer.
Delivery:
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