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Part: 85125012A
Category:
Logic
-> Encoders/Multiplexers
-> Multiplexers
Description: ti SN54HC251, Data Selectors/multiplexers With 3-State Outputs
Company: Texas Instruments, Inc.
Datasheet: Download 85125012A datasheet File size : 209 kB
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Datasheet text preview:
SCLS132E - DECEMBER 1982 - REVISED SEPTEMBER 2003
SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS
D 3-State Version of 'HC151 D Wide Operating Voltage Range of 2 V to 6 V D High-Current 3-State Outputs Interface D D D D D D
Directly With System Bus or Can Drive Up To 15 LSTTL Loads Low Power Consumption, 80-µA Max ICC Typical tpd = 9 ns ±6-mA Output Drive at 5 V Low Input Current of 1 µA Max Perform Parallel-to-Serial Conversion Complementary Outputs Provide True and Inverted Data
SN54HC251 . . . J OR W PACKAGE SN74HC251 . . . D, DB, N, NS, OR PW PACKAGE (TOP VIEW)
D3 D2 D1 D0 Y W OE GND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VCC D4 D5 D6 D7 A B C
These data selectors/multiplexers contain full binary decoding to select 1-of-8 data sources and feature strobe-controlled complementary 3-state outputs. The 3-state outputs can interface with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (in the high-impedance state), the low impedance of the single enabled output drives the bus line to a high or low logic level. Both outputs are controlled by the output-enable (OE) input. The outputs are disabled when OE is high. ORDERING INFORMATION
TA PDIP - N PACKAGE Tube of 25 Tube of 40 SOIC - D -40°C to 85 C 85°C SOP - NS SSOP - DB Reel of 2500 Reel of 250 Reel of 2000 Reel of 2000 Tube of 90 TSSOP - PW CDIP - J -55°C to 125 C 125°C CFP - W Reel of 2000 Reel of 250 Tube of 25 Tube of 150
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 ORDERABLE PART NUMBER SN74HC251N SN74HC251D SN74HC251DR SN74HC251DT SN74HC251NSR SN74HC251DBR SN74HC251PW SN74HC251PWR SN74HC251PWT SNJ54HC251J SNJ54HC251W SNJ54HC251J SNJ54HC251W HC251 HC251 HC251 HC251
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.
description/ordering information
SN54HC251 . . . FK PACKAGE (TOP VIEW)
LCCC - FK Tube of 55 SNJ54HC251FK SNJ54HC251FK 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
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
OE GND NC C B
TOP-SIDE MARKING SN74HC251N
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SCLS132E - DECEMBER 1982 - REVISED SEPTEMBER 2003
SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS
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 OE H L L L L L L L L Y Z D0 D1 D2 D3 D4 D5 D6 D7 W Z D0 D1 D2 D3 D4 D5 D6 D7 OUTPUTS
D0, D1 . . . D7 = the level of the respective D input
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SCLS132E - DECEMBER 1982 - REVISED SEPTEMBER 2003
SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS
logic diagram (positive logic)
OE 7 11
A B C
10 9
D0 D1
4
TG
3
TG
D2
2
TG
5 D3 1
TG
Y
D4
15
TG
6 D5 14 13
TG TG
W
D6
D7
12
TG
Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
3
SCLS132E - DECEMBER 1982 - REVISED SEPTEMBER 2003
SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS
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) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Output clamp current, IOK (VO VCC) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±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 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82°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. NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 3)
SN54HC251 MIN VCC VIH Supply voltage VCC = 2 V VCC = 4.5 V VCC = 6 V VCC = 2 V VIL VI VO t/v Low-level input voltage Input voltage Output voltage VCC = 2 V VCC = 4.5 V VCC = 6 V VCC = 4.5 V VCC = 6 V 0 0 2 1.5 3.15 4.2 0.5 1.35 1.8 VCC VCC 1000 500 400 0 0 NOM 5 MAX 6 SN74HC251 MIN 2 1.5 3.15 4.2 0.5 1.35 1.8 VCC VCC 1000 500 400 ns V V V V NOM 5 MAX 6 UNIT V
High-level input voltage
Input transition rise/fall time
TA Operating free-air temperature -55 125 -40 85 °C NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SCLS132E - DECEMBER 1982 - REVISED SEPTEMBER 2003
SN54HC251, SN74HC251 DATA SELECTORS/MULTIPLEXERS WITH 3 STATE OUTPUTS
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS VCC 2V IOH = -20 µA VOH VI = VIH or VIL IOH = -6 mA IOH = -7.8 mA IOL = 20 µA VOL VI = VIH or VIL IOL = 6 mA IOL = 7.8 mA II IOZ ICC Ci VI = VCC or 0 VO = VCC or 0, VI = VCC or 0, VI = VIH or VIL IO = 0 4.5 V 6V 4.5 V 6V 2V 4.5 V 6V 4.5 V 6V 6V 6V 6V 2 V to 6 V 3 MIN 1.9 4.4 5.9 3.98 5.48 TA = 25°C TYP MAX 1.998 4.499 5.999 4.3 5.8 0.002 0.001 0.001 0.17 0.15 ±0.1 ±0.01 0.1 0.1 0.1 0.26 0.26 ±100 ±0.5 8 10 SN54HC251 MIN 1.9 4.4 5.9 3.7 5.2 0.1 0.1 0.1 0.4 0.4 ±1000 ±10 160 10 MAX SN74HC251 MIN 1.9 4.4 5.9 3.84 5.34 0.1 0.1 0.1 0.33 0.33 ±1000 ±5 80 10 nA µA µA pF V V MAX UNIT
switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER FROM (INPUT) TO (OUTPUT) VCC 2V A, B, or C tpd Any D W or Y W or Y 4.5 V 6V 2V 4.5 V 6V 2V ten OE W or Y 4.5 V 6V 2V tdis OE W or Y 4.5 V 6V 2V tt W or Y 4.5 V 6V TA = 25°C MIN TYP MAX 58 21 19 44 17 15 30 10 9 25 15 14 20 8 6 205 41 35 195 39 33 145 29 25 195 39 33 75 15 13 SN54HC251 MIN MAX 300 60 51 283 57 48 210 42 36 283 57 48 110 22 19 SN74HC251 MIN MAX 256 51 44 244 49 41 181 36 31 244 49 41 95 19 16 ns ns ns ns UNIT
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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