DM74AS258M

DM74AS258M Datasheet

DM74AS257<br>• DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers

Part	Datasheet
DM74AS258M	DM74AS258M (pdf)

Related Parts	Information
DM74AS257N	DM74AS257N
DM74AS258N	DM74AS258N
DM74AS258MX	DM74AS258MX
DM74AS257MX	DM74AS257MX
DM74AS257M	DM74AS257M

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DM74AS257 • DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers DM74AS257 • DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers These data selectors/multiplexers contain inverters and drivers to supply full on-chip data selection to the four 3STATE 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 registers for data retention throughout the system. 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 counterparts 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, Narrow DM74AS257N N16E 16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide DM74AS258M M16A 16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow DM74AS258N N16E 16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, 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 A CONTROL H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance OFF OUTPUT Y B AS257 AS258 2000 Fairchild Semiconductor Corporation DS006107 DM74AS257 • DM74AS258 Logic Diagrams DM74AS257 DM74AS258 DM74AS257 • DM74AS258 Absolute Maximum Ratings Note 1 Supply Voltage, VCC Input Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical N Package 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 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 Units −15 Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Parameter Conditions Units Input Clamp Voltage HIGH Level Output Voltage 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 VCC − 2

PDF Datasheet Preview

DM74AS257
• DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers

DM74AS257
• DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers

These data selectors/multiplexers contain inverters and drivers to supply full on-chip data selection to the four 3STATE 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 registers for data retention throughout the system.
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 counterparts 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, Narrow

DM74AS257N

N16E
16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide

DM74AS258M

M16A
16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow

DM74AS258N

N16E
16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, 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 A

CONTROL

H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance OFF

OUTPUT Y

B AS257 AS258
2000 Fairchild Semiconductor Corporation DS006107

DM74AS257
• DM74AS258

Logic Diagrams

DM74AS257

DM74AS258

DM74AS257
• DM74AS258

Absolute Maximum Ratings Note 1

Supply Voltage, VCC Input Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical

N Package
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

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

Units
−15

Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.

Parameter

Conditions

Units

Input Clamp

Voltage

HIGH Level

Output Voltage

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

VCC − 2

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Datasheet ID: DM74AS258M 513724