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Details, datasheet, quote on part number:SN74HC257
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| Part: | SN74HC257 |
| Category: | Logic => Multiplexers/Demultiplexers => Multiplexers->CMOS/BiCMOS->HC/HCT Family |
| Description: | Quad 2-to-1 Data Selector/multiplexer With 3-state Outputs |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download SN74HC257 datasheet File size : 289 kB |
| Request For quote: | Find where to buy SN74HC257
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Datasheet text preview:
SN54HC257, SN54HC258, SN74HC257, SN74HC258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SCLS224A DECEMBER 1982 REVISED MARCH 2003
D D D D
Wide Operating Voltage Range of 2 V to 6 V High-Current Inverting Outputs Drive up to 15 LSTTL Loads Low Power Consumption, 80-µA Max ICC 'HC257 . . . Typical tpd = 9 ns
D D D D
'HC258 . . . Typical tpd = 12 ns ±6-mA Output Drive at 5 V Low Input Current of 1 µA Max Provides Bus Interface from Multiple Sources in High-Performance Systems
SN54HC257, SN54HC258 . . . FK PACKAGE (TOP VIEW)
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 G 4A 4B 4Y 3A 3B 3Y
1A A/B NC VCC G 1B 1Y NC 2A 2B
3 4 5 6 7 8 2 1 20 19 18 17 16 15 14 9 10 11 12 13
SN54HC257, SN54HC258 . . . J PACKAGE SN74HC257, SN74HC258 . . . D, N, NS, OR PW PACKAGE (TOP VIEW)
4A 4B NC 4Y 3A
NC No internal connection
description/ordering information
These devices 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 (G) input is at a high logic level. ORDERING INFORMATION
TA PDIP N PACKAGE Tube Tube SOIC D 40°C to 85°C to 85°C SOP NS NS Tape and reel Tube Tape and reel Tape and reel and reel Tube TSSOP PW PW Tape and reel Tube Tape and reel CDIP J 55°C to 125°C to 125°C LCCC FK FK Tube Tube ORDERABLE PART NUMBER SN74HC257N SN74HC258N SN74HC257D SN74HC257DR SN74HC258D SN74HC258DR SN74HC257NSR SN74HC258NSR SN74HC257PW SN74HC257PWR SN74HC258PW SN74HC258PWR SNJ54HC257J SNJ54HC258J SNJ54HC257FK SNJ54HC258FK TOP-SIDE MARKING SN74HC257N SN74HC258N HC257 HC258 HC257 HC258 HC257 HC258 SNJ54HC257J SNJ54HC258J SNJ54HC257FK SNJ54HC258FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 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 2003, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, 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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SN54HC257, SN54HC258, SN74HC257, SN74HC258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SCLS224A DECEMBER 1982 REVISED MARCH 2003
description/ordering information (continued)
To ensure the high-impedance state during power up or power down, G should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE INPUTS G 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 'HC257 Z L H L H 'HC258 Z H L H L
'HC257 logic diagram (positive logic)
G 15
A/B
1
1A
2 4 3 1Y
1B
2A
5 7 6 2Y
2B
3A
11 9 10 3Y
3B
4A
14 12 13 4Y
4B
Pin numbers shown are for the D, J, N, NS, and PW packages.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54HC257, SN54HC258, SN74HC257, SN74HC258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SCLS224A DECEMBER 1982 REVISED MARCH 2003
'HC258 logic diagram (positive logic)
G 15
A/B
1
1A
2 4 3 1Y
1B
2A
5 7 6 2Y
2B
3A
11 9 10 3Y
3B
4A
14 12 13 4Y
4B
Pin numbers shown are for the D, J, N, NS, and PW packages.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V Input clamp current, IIK (VI VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Output clamp current, IOK (VO VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±35 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±70 mA Package thermal impedance, JA (see Note 1): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64°C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108°C/W 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 package thermal impedance is calculated in accordance with JESD 51-7.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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