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Part: 85097012A
Category:
Logic
-> Encoders/Multiplexers
-> Multiplexers
Description: ti SN54ALS257A, Quad 2-Line to 1-Line Data Selectors/multiplexers With 3-State
Company: Texas Instruments, Inc.
Datasheet: Download 85097012A datasheet File size : 209 kB
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Datasheet text preview:
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDAS124C APRIL 1982 REVISED AUGUST 1996
D D D
3-State Outputs Interface Directly With System Bus Provide Bus Interface From Multiple Sources in High-Performance Systems Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
SN54ALS257A, SN54ALS258A . . . J PACKAGE SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 . . . D OR N PACKAGE (TOP VIEW)
description
These data selectors/multiplexers are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at a high logic level. The SN54ALS257A and SN54ALS258A are characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ALS257A, SN74ALS258A, SN74AS257, and SN74AS258 are characterized for operation from 0°C to 70°C.
A/B 1A 1B 1Y 2A 2B 2Y GND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VCC OE 4A 4B 4Y 3A 3B 3Y
SN54ALS257A, SN54ALS258A . . . FK PACKAGE (TOP VIEW)
1B 1Y NC 2A 2B
3 4 5 6 7 8
A/B NC VCC OE
2 1 20 19 18 17 16 15
1A
14 9 10 11 12 13
4A 4B NC 4Y 3A
NC No internal connection FUNCTION TABLE INPUTS DATA OE H L L L L A /B A X L L H H X L H X X B X X X L H OUTPUT Y SN54ALS257A SN74ALS257A SN74AS257 Z L H L H SN54ALS258A SN74ALS258A SN74AS258 Z H L H L
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 1996, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
2Y GND NC 3Y 3B
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SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDAS124C APRIL 1982 REVISED AUGUST 1996
logic symbols
SN54ALS257A, SN74ALS257A, SN74AS257 15 OE A /B 1A 1B 2A 2B 3A 3B 4A 4B 2 3 5 6 11 10 14 13 12 4Y 9 3Y 7 2Y 1 1 1 EN G1 MUX 4 15 OE A /B 1A 1Y 1B 2A 2B 3A 3B 4A 4B 2 3 5 6 11 10 14 13 12 4Y 9 3Y 7 2Y 1 1 1 SN54ALS258A, SN74ALS258A, SN74AS258 EN G1 MUX 4
1Y
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages.
logic diagrams (positive logic)
SN54ALS257A, SN74ALS257A, SN74AS257 OE A/B 15 1 OE A /B 15 1 SN54ALS258A, SN74ALS258A, SN74AS258
1A 1B 2A 2B 3A 3B 4A 4B
2 4 3 5 7 6 11 9 10 14 12 13 4Y 3Y 2Y 1Y
1A 1B 2A 2B 3A 3B 4A 4B
2 4 3 5 7 6 11 9 10 14 12 13 4Y 3Y 2Y 1Y
Pin numbers shown are for the D, J, and N packages.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDAS124C APRIL 1982 REVISED AUGUST 1996
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Maximum power dissipation at TA = 55°C (in still air) (see Note 1): D package . . . . . . . . . . . . . . . . . . . 1.3 W N package . . . . . . . . . . . . . . . . . . . 1.1 W Operating free-air temperature range, TA: SN54ALS257A, SN54ALS258A . . . . . . . . . . . . . . 55°C to 125°C SN74ALS257A, SN74ALS258A . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils, except for the N package, which has a trace length of zero.
recommended operating conditions
SN54ALS257A SN54ALS258A MIN VCC VIH VIL IOH IOL TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Operating free-air temperature 55 4.5 2 0.7 1 12 125 0 NOM 5 MAX 5.5 SN74ALS257A SN74ALS258A MIN 4.5 2 0.8 2.6 24 70 NOM 5 MAX 5.5 V V V mA mA °C UNIT
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDAS124C APRIL 1982 REVISED AUGUST 1996
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK VOH TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4 5 V 4.5 VCC = 4 5 V 4.5 VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, VCC = 5.5 V, SN54ALS257A, SN74ALS257A ICC SN54ALS258A, SN74ALS258A VCC = 5.5 V VCC = 5.5 V II = 18 mA IOH = 0.4 mA IOH = 1 mA IOH = 2.6 mA IOL = 12 mA IOL = 24 mA VO = 2.7 V VO = 0.4 V VI = 7 V VI = 2.7 V VI = 0.4 V VO = 2.25 V Outputs high Outputs low Outputs disabled Outputs high Outputs low Outputs disabled 20 3 8 9 2.5 7 8 SN54ALS257A SN54ALS258A MIN VCC2 2.4 TYP MAX 1.5 VCC2 3.3 2.4 0.25 0.4 20 20 0.1 20 0.1 112 8 12 14 5 11 13 30 3 8 9 2.5 7 8 3.2 0.25 0.35 0.4 0.5 20 20 0.1 20 0.1 112 6 12 14 4 11 13 mA V µA µA mA µA mA mA V SN74ALS257A SN74ALS258A MIN TYP MAX 1.5 V UNIT
VOH IOZH IOZL II IIH IIL IO
All typical values are at VCC = 5 V, TA = 25°C. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX§ SN54ALS257A SN74ALS257A MIN tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ A or B or Any Y Any Y Any Y Any Y 2 2 4 6 3 4 2 2 MAX 12 14 21 25 20 22 12 35 MIN 2 2 6 6 4 5 2 4 MAX 10 12 18 22 16 18 10 15 ns ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
A /B OE OE
§ For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
4
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDAS124C APRIL 1982 REVISED AUGUST 1996
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX SN54ALS258A MIN tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ A or B or Any Y Any Y Any Y Any Y 1 2 4 5 3 5 2 3 MAX 12 9 28 25 20 21 12 37 SN74ALS258A MIN 2 2 5 6 4 5 2 4 MAX 8 7 25 20 18 18 10 18 ns ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
A /B OE OE
For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Maximum power dissipation at TA = 55°C (in still air) (see Note 1): D package . . . . . . . . . . . . . . . . . . . 1.3 W N package . . . . . . . . . . . . . . . . . . . 1.1 W Operating free-air temperature range, TA: SN74AS257, SN74AS258 . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils, except for the N package, which has a trace length of zero.
recommended operating conditions
SN74AS257 SN74AS258 MIN VCC VIH VIL IOH IOL TA Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current Operating free-air temperature 0 4.5 2 0.8 15 48 70 NOM 5 MAX 5.5 V V V mA mA °C UNIT
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
5
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