DM74AS257SJ

DM74AS257SJ Datasheet

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

Part	Datasheet
DM74AS257SJ	DM74AS257SJ (pdf)

Related Parts	Information
DM74AS257SJX	DM74AS257SJX

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DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers May 2007 DM74AS257, DM74AS258 tm 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers • Switching specifications at 50pF • 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 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 registers for data retention throughout the system. Ordering Information Order Number Package Number Package Description DM74AS257M DM74AS257N DM74AS258M M16A N16E M16A 16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow 16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide 16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number. DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Connection Diagram Logic Diagrams DM74AS257 Function Table Inputs OUTPUT Control Select A H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance OFF Output Y B AS257 AS258 DM74AS258 1986 Fairchild Semiconductor Corporation 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. Symbol VCC VI TA TSTG JA Parameter Supply Voltage Input Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical Thermal Resistance, N Package Rating 7V 5.5V 0°C to +70°C to +150°C 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. 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. 2 Nom. 5 Max. 48 70 Units V mA °C 1986 Fairchild Semiconductor Corporation DM74AS257, DM74AS258 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers Electrical Characteristics Over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Parameter Conditions Min. Typ. Max. Units VIK Input Clamp Voltage VOH HIGH Level Output Voltage VOL LOW Level Output Voltage Input Current Max. Input

PDF Datasheet Preview

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

May 2007

DM74AS257, DM74AS258 tm
3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
• Switching specifications at 50pF
• 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

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 registers for data retention throughout the system.
Ordering Information

Order Number

Package Number

Package Description

DM74AS257M DM74AS257N DM74AS258M

M16A N16E M16A
16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow 16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide 16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number.

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

Connection Diagram

Logic Diagrams

DM74AS257

Function Table

Inputs

OUTPUT Control Select A

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

Output Y

B AS257 AS258

DM74AS258
1986 Fairchild Semiconductor Corporation

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.

Symbol VCC VI

TA TSTG JA

Parameter Supply Voltage Input Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical Thermal Resistance, N Package

Rating 7V
5.5V 0°C to +70°C to +150°C
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.

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. 2

Nom. 5

Max.
48 70

Units V mA °C
1986 Fairchild Semiconductor Corporation

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

Electrical Characteristics

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

Parameter

Conditions

Min. Typ. Max. Units

VIK Input Clamp Voltage VOH HIGH Level Output Voltage

VOL LOW Level Output Voltage

Input Current Max. Input

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Datasheet ID: DM74AS257SJ 513725