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Details, datasheet, quote on part number:SN54F251BFK
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Datasheet text preview:
SN54F251B, SN74F251B 1-OF-8 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDFS066A MARCH 1987 REVISED OCTOBER 1993
· · · · ·
3-State Versions of SN54F151B and SN74F151B 3-State Outputs Interface Directly With System Bus Performs Parallel-to-Serial Conversion Complementary Outputs Provide True and Inverted Data Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs
SN54F251B . . . J PACKAGE SN74F251B . . . D OR N PACKAGE (TOP VIEW)
D3 D2 D1 D0 Y W G GND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VC C D4 D5 D6 D7 A B C
description
These data selectors/multiplexers contain full binary decoding to select one of eight data sources and feature strobe-controlled complementary outputs. The 3-state outputs can interface with and drive data lines of busorganized systems. When the strobe (G) input is high, both outputs are in a high-impedance state in which both the upper and lower transistors of each totem-pole output are off, and the output neither drives nor loads the bus significantly. The SN54F251B is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74F251B is characterized for operation from 0°C to 70°C.
FUNCTION TABLE INPUTS SELECT C X L L L L H H H H B X L L H H L L H H A X L H L H L H L H STROBE G H L L L L L L L L
SN54F251B . . . FK PACKAGE (TOP VIEW)
D1 D0 NC Y W
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
D2 D3 NC VCC D4 D5 D6 NC D7 A
NC No internal connection OUTPUTS Y Z D0 D1 D2 D3 D4 D5 D6 D7 W Z D0 D1 D2 D3 D4 D5 D6 D7
Copyright © 1993, Texas Instruments Incorporated
D0, D1, . . . D7 = the level of the respective D input.
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
G GND NC C B
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SN54F251B, SN74F251B 1-OF-8 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDFS066A MARCH 1987 REVISED OCTOBER 1993
logic symbol
G A B C D0 D1 D2 D3 D4 D5 D6 D7 7 11 10 9 4 3 2 1 15 14 13 12 2 0 1 2 3 4 5 6 7 5 6 Y W MUX EN 0 0 G7
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.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54F251B, SN74F251B 1-OF-8 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
SDFS066A MARCH 1987 REVISED OCTOBER 1993
logic diagram (positive logic)
G D0 7 4
D1
3
D2
2
D3 Data Inputs D4
1 5 15 6 Y W
D5
14
D6
13
D7
12
A Data Select (Binary)
11
B
10
C
9
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: SN54F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA SN74F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA Operating free-air temperature range: SN54F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C SN74F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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