SN74ALS251NSR




   
 

 
 
SDAS215A − APRIL 1982 − REVISED DECEMBER 1994 • • • • • 3-State Version of the ′ALS151 3-State Outputs Interface Directly With System Bus Perform Parallel-to-Serial Conversion Complementary Outputs Provide True and Inverted Data Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs SN54ALS251 . . . J PACKAGE SN74ALS251 . . . D OR N PACKAGE (TOP VIEW) D3 D2 D1 D0 Y W OE GND 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC 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 controlled complementary 3-state outputs. D2 D3 NC VCC D4 SN54ALS251 . . . FK PACKAGE (TOP VIEW) The 3-state outputs can interface with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (at the high-impedance state), the low impedance of the signal-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. 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 D5 D6 NC D7 A OE GND NC C B D1 D0 NC Y W The SN54ALS251 is characterized for operation over the full military temperature range of − 55°C to 125°C. The SN74ALS251 is characterized for operation from 0°C to 70°C. NC − No internal connection FUNCTION TABLE INPUTS OUTPUTS SELECT OE C B A Y W X X X H Z Z L L L L D0 D0 L L H L D1 D1 L H L L D2 D2 L H H L D3 D3 H L L L D4 D4 H L H L D5 D5 H H L L D6 D6 H H H L D7 D7 D0, D1, . . . D7 = the level of the respective D input Copyright  1994, Texas Instruments Incorporated     !"#$%&" ' ()##*& %' "! +),-(%&" .%&*/ #".)(&' ("!"#$ &" '+*(!(%&"' +*# &0* &*#$' "! *1%' '&#)$*&' '&%.%#. 2%##%&3/ #".)(&" +#"(*''4 ."*' "& *(*''%#-3 (-).* &*'&4 "! %-- +%#%$*&*#'/ • DALLAS, TEXAS 75265 • HOUSTON, TEXAS 77251−1443 POST OFFICE BOX 655303 POST OFFICE BOX 1443 1 



   
 

 
 
SDAS215A − APRIL 1982 − REVISED DECEMBER 1994 logic symbol† OE A B C D0 D1 D2 D3 D4 D5 D6 D7 7 11 MUX EN 0 10 9 4 3 2 1 15 14 13 12 0 G7 2 0 5 1 6 2 Y W 3 4 5 6 7 † 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. logic diagram (positive logic) OE D0 D1 D2 D3 Data Inputs 4 3 2 1 5 D4 D5 D6 D7 A Data Select (binary) 7 B C 15 6 14 13 12 11 10 9 Pin numbers shown are for the D, J, and N packages. 2 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • Y W 



   
 

 
 
SDAS215A − APRIL 1982 − REVISED DECEMBER 1994 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 Operating free-air temperature range, TA: SN54ALS251 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C SN74ALS251 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. recommended operating conditions SN54ALS251 SN74ALS251 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IOH Low-level input voltage 0.7 0.8 V High-level output current −1 −2.6 mA IOL TA Low-level output current 24 mA 70 °C High-level input voltage 2 2 V 12 Operating free-air temperature −55 125 V 0 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK SN54ALS251 TYP‡ MAX TEST CONDITIONS MIN VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = − 18 mA IOH = − 0.4 mA VCC = 4.5 V IOH = − 1 mA IOH = − 2.6 mA VOL VCC = 4.5 V IOL = 12 mA IOL = 24 mA IOZH IOZL VCC = 5.5 V, VCC = 5.5 V, VO = 2.7 V VO = 0.4 V II IIH VCC = 5.5 V, VCC = 5.5 V, IIL IO§ VCC = 5.5 V, VCC = 5.5 V, VOH ICC Enabled Disabled VCC = 5.5 V SN74ALS251 TYP‡ MAX MIN −1.5 VCC − 2 2.4 −1.5 UNIT V VCC − 2 3.3 V 2.4 0.25 0.4 3.2 0.25 0.4 0.35 0.5 V 20 20 µA −20 −20 µA VI = 7 V VI = 2.7 V 0.1 0.1 mA 20 20 µA VI = 0.4 V VO = 4.5 V −0.1 −0.1 mA −112 mA −20 −112 −30 Inputs at GND 7 10 7 10 Inputs at 4.5 V 9.4 14 9.4 14 mA ‡ 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. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 3 



   
 

 
 
SDAS215A − APRIL 1982 − REVISED DECEMBER 1994 switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A, B, or C Y tPLH tPHL A, B, or C W tPLH tPHL Any D Y tPLH tPHL Any D W tPZH tPZL OE Y tPZH tPZL OE W tPZH tPZL OE Y tPZH tPZL OE W VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† SN54ALS251 SN74ALS251 MIN MAX MIN MAX 1 21 5 18 7 34 8 24 5 38 8 24 7 26 7 23 2 15 2 10 3 23 3 15 3 25 3 15 3 20 3 15 3 21 3 15 3 19 3 15 3 21 3 15 3 19 3 15 2 12 2 10 1 18 1 10 2 12 2 10 1 18 1 10 † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. 4 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • UNIT ns ns ns ns ns ns ns ns 



   
 

 
 
SDAS215A − APRIL 1982 − REVISED DECEMBER 1994 PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V RL = R1 = R2 VCC S1 RL R1 Test Point From Output Under Test CL (see Note A) From Output Under Test RL Test Point CL (see Note A) CL (see Note A) LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS 3.5 V Timing Input Test Point From Output Under Test LOAD CIRCUIT FOR 3-STATE OUTPUTS 3.5 V High-Level Pulse 1.3 V R2 1.3 V 1.3 V 0.3 V 0.3 V tsu Data Input tw th 3.5 V 1.3 V 3.5 V Low-Level Pulse 1.3 V 0.3 V 1.3 V 0.3 V VOLTAGE WAVEFORMS PULSE DURATIONS VOLTAGE WAVEFORMS SETUP AND HOLD TIMES 3.5 V Output Control (low-level enabling) 1.3 V 1.3 V 0.3 V tPZL Waveform 1 S1 Closed (see Note B) tPLZ 3.5 V Input tPZH 1.3 V 0.3 V tPHL tPLH VOH In-Phase Output VOL 0.3 V 1.3 V 1.3 V VOL tPLH tPHL VOH 1.3 V 1.3 V [3.5 V 1.3 V tPHZ Waveform 2 S1 Open (see Note B) 1.3 V VOH Out-of-Phase Output (see Note C) 0.3 V [0 V 1.3 V 1.3 V VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. When measuring propagation delay items of 3-state outputs, switch S1 is open. D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%. E. The outputs are measured one at a time with one transition per measurement. Figure 1. Load Circuits and Voltage Waveforms • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 5 PACKAGE OPTION ADDENDUM www.ti.com 23-Sep-2022 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) 84135012A ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 84135012A SNJ54ALS 251FK 8413501EA ACTIVE CDIP J 16 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 8413501EA SNJ54ALS251J Samples 8413501FA ACTIVE CFP W 16 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 8413501FA SNJ54ALS251W Samples SN54ALS251J ACTIVE CDIP J 16 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 SN54ALS251J Samples SN74ALS251D ACTIVE SOIC D 16 40 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 ALS251 Samples SN74ALS251DR ACTIVE SOIC D 16 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 ALS251 Samples SN74ALS251N ACTIVE PDIP N 16 25 RoHS & Green NIPDAU N / A for Pkg Type 0 to 70 SN74ALS251N Samples SNJ54ALS251FK ACTIVE LCCC FK 20 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 84135012A SNJ54ALS 251FK SNJ54ALS251J ACTIVE CDIP J 16 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 8413501EA SNJ54ALS251J Samples SNJ54ALS251W ACTIVE CFP W 16 1 Non-RoHS & Green SNPB N / A for Pkg Type -55 to 125 8413501FA SNJ54ALS251W Samples (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of