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Details, datasheet, quote on part number:SN54F257
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| Part: | SN54F257 |
| Category: | Logic => Buffers/Inverters => 3-State |
| Description: | Quadruple 2-line to 1-line Data Selectors/multiplexers With 3-state Outputs |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download SN54F257 datasheet File size : 76 kB |
| Request For quote: | Find where to buy SN54F257
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Datasheet text preview:
SN54F257, SN74F257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDFS065A D2932, MARCH 1987 REVISED OCTOBER 1993
· · ·
3-State Outputs Interface Directly With System Bus Provides Bus Interface From Multiple Sources in High-Performance Systems Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs
SN54F257 . . . J PACKAGE SN74F257 . . . D OR N PACKAGE (TOP VIEW)
description
The F257 is designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs will not load the data lines when the output enable (OE) input is at a high logic level. The SN54F257 is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74F257 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE INPUTS OE H L L L L A /B X L L H H A X L H X X B X X X L H OUTPUT Y Z L H L H
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
SN54F257 . . . FK PACKAGE (TOP VIEW)
1B 1Y NC 2A 2B
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
1A A/B NC VCC OE 4A 4B NC 4Y 3A
NC No internal connection MUX 4 1Y 7 2Y 9 3Y 12 4Y
Copyright © 1993, Texas Instruments Incorporated
logic symbol
15 OE A /B 1A 1B 2A 2B 3A 3B 4A 4B 2 3 5 6 11 10 14 13 1 1 1 EN G1
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages.
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.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
2Y GND NC 3Y 3B
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SN54F257, SN74F257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDFS065A D2932, MARCH 1987 REVISED OCTOBER 1993
logic diagram (positive logic)
OE 15
A/B
1
1A
2 4 3 1Y
1B
2A
5 7 2Y
2B
6
3A
11 9 10 3Y
3B
4A
14 12 13 4Y
4B
Pin numbers shown are for the D, J, and N packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V Input voltage range (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 V to 7 V Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA to 5 mA Voltage range applied to any output in the disabled or power-off state . . . . . . . . . . . . . . . . . . . 0.5 V to 5.5 V Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC Current into any output in the low state: SN54F257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA SN74F257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA Operating free-air temperature range: SN54F257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C SN74F257 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 input voltage ratings may be exceeded provided the input current ratings are observed.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54F257, SN74F257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDFS065A D2932, MARCH 1987 REVISED OCTOBER 1993
recommended operating conditions
SN54F257 MIN VCC VIH VIL IIK IOH IOL TA Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level output current Low-level output current Operating free-air temperature 55 4.5 2 0.8 18 3 20 125 0 NOM 5 MAX 5.5 SN74F257 MIN 4.5 2 0.8 18 3 24 70 NOM 5 MAX 5.5 UNIT V V V mA mA mA °C
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK VOH VCC = 4.5 V, VCC = 4 5 V 4.5 VCC = 4.75 V, VOL IOZH IOZL II IIH IIL IOS ICCH ICCL 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, VCC = 5.5 V 5 5 V, Note See Note 2 TEST CONDITIONS CONDITIONS II = 18 mA IOH = 1 mA IOH = 3 mA IOH = 1 mA to 3 mA IOL = 20 mA IOL = 24 mA VO = 2.7 V VO = 0.5 V VI = 7 V VI = 2.7 V VI = 0.5 V VO = 0 Condition A Condition B 60 9 14.5 MIN SN54F257 TYP MAX 1.2 2.5 2.4 3.4 3.3 0.3 0.5 0.35 50 50 0.1 20 0.6 150 15 22 60 9 14.5 0.5 50 50 0.1 20 0.6 150 15 22 23 mA 2.5 2.4 2.7 V µA µA mA µA mA mA 3.4 3.3 V MIN SN74F257 TYP MAX 1.2 UNIT V
ICCZ Condition C 15 23 15 All typical values are at VCC = 5 V, TA = 25°C. Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. NOTE 2: ICC is measured with the outputs open under the following conditions: A. A/B and all B inputs at 4.5 V, other inputs grounded B. All B inputs at 4.5 V, other inputs grounded C. OE and all B data inputs at 4.5 V, other inputs grounded
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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