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SN74LS253 Dual 4-Input Multiplexer with 3-State Outputs
The LSTTL / MSI SN74LS253 is a Dual 4-Input Multiplexer with 3-state outputs. It can select two bits of data from four sources using common select inputs. The outputs may be individually switched to a high impedance state with a HIGH on the respective Output Enable (E0) inputs, allowing the outputs to interface directly with bus oriented systems. It is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all ON Semiconductor TTL families.
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Schottky Process for High Speed Multifunction Capability Non-Inverting 3-State Outputs Input Clamp Diodes Limit High Speed Termination Effects
LOW POWER SCHOTTKY
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Current - High Output Current - Low Min 4.75 0 Typ 5.0 25 Max 5.25 70 - 2.6 24 Unit V C mA mA
16 1
PLASTIC N SUFFIX CASE 648
16 1
SOIC D SUFFIX CASE 751B
ORDERING INFORMATION
Device SN74LS253N SN74LS253D Package 16 Pin DIP 16 Pin Shipping 2000 Units/Box 2500/Tape & Reel
(c) Semiconductor Components Industries, LLC, 1999
1
December, 1999 - Rev. 6
Publication Order Number: SN74LS253/D
SN74LS253
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 E0b 15 S0 14 I3b 13 I2b 12 I1b 11 I0b 10 Zb 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 E0a 2 S1 3 I3a 4 I2a 5 I1a 6 I0a 7 Za 8 GND
LOADING (Note a) PIN NAMES S0, S1 Multiplexer A E0a I0a - I3a Za Multiplexer B E0b I0b - I3b Zb Common Select Inputs Output Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output Output Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 65 U.L. 0.5 U.L. 0.5 U.L. 65 U.L. LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 15 U.L. 0.25 U.L. 0.25 U.L. 15 U.L.
NOTES: a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOGIC SYMBOL
1 654 3 10 11 12 13 15
14 2
EIIII IIIIE S0 0a 0a 1a 2a 3a 0b 1b 2b 3b 0b S1 Za Zb
7 VCC = PIN 16 GND = PIN 8
9
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SN74LS253
LOGIC DIAGRAM
E0b
15
I3b
13
I2b
12
I1b
11
I0b
10
S0
14
S1
2
I3a
3
I2a
4
I1a
5
I0a
6
E0a
1
Zb
9
VCC = PIN 16 GND = PIN 8 = PIN NUMBERS
Za
7
FUNCTIONAL DESCRIPTION
The LS253 contains two identical 4-Input Multiplexers with 3-state outputs. They select two bits from four sources selected by common select inputs (S0, S1). The 4-input multiplexers have individual Output Enable (E0a, E0b) inputs which when HIGH, forces the outputs to a high impedance (high Z) state. The LS253 is the logic implementation of a 2-pole, 4-position switch, where the position of the switch is determined by the logic levels supplied to the two select inputs. The logic equations for the outputs are shown below:
Za = E0a (I0a S1 S0 + I1a S1 S0 I2a S1 S0 + I3a S1 S0) Zb = E0b (I0b S1 S0 + I1b S1 S0 I2b S1 S0 + I3b S1 S0)
If the outputs of 3-state devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. Designers should ensure that Output Enable signals to 3-state devices whose outputs are tied together are designed so that there is no overlap.
TRUTH TABLE
SELECT INPUTS S0 X L L H H L L H H S1 X L L L L H H H H I0 X L H X X X X X X DATA INPUTS I1 X X X L H X X X X I2 X X X X X L H X X I3 X X X X X X X L H OUTPUT ENABLE E0 H L L L L L L L L OUTPUT Z (Z) L H L H L H L H
H = HIGH Level L = LOW Level X = Irrelevant (Z) = High Impedance (off) Address inputs S0 and S1 are common to both sections.
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SN74LS253
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 2.4 - 0.65 3.1 0.25 VO OL IOZH IOZL IIH IIL IOS ICC Output LOW Voltage 0.35 Output Off Current HIGH Output Off Current LOW Input HIGH Current 0.1 Input LOW Current Short Circuit Current (Note 1) Power Supply Current 14 mA - 30 - 0.4 - 130 12 0.5 20 - 20 20 V A A A mA mA mA mA IOL = 24 mA 0.4 Min 2.0 0.8 - 1.5 Typ Max Unit V V V V V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 12 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table
VCC = MAX, VOUT = 2.7 V VCC = MAX, VOUT = 0.4 V VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX, VE = 0 V VCC = MAX, VE = 4.5 V
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) See SN74LS251 for Waveforms
Limits Symbol tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay, Data to Output Propagation Delay, Select to Output Output Enable Time Output Disable Time Min Typ 17 13 30 21 15 15 27 18 Max 25 20 45 32 28 23 41 27 Unit ns ns ns ns Figure 1 Figure 1 Figures 4, 5 Figures 3, 5 CL = 5.0 pF, RL = 667 CL = 45 pF, RL = 667 Test Conditions
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SN74LS253
PACKAGE DIMENSIONS
N SUFFIX PLASTIC PACKAGE CASE 648-08 ISSUE R
-A-
16 9 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. DIM A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01
B
1 8
F S
C
L
-T- H G D
16 PL
SEATING PLANE
K
J TA
M
M
0.25 (0.010)
M
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SN74LS253
PACKAGE DIMENSIONS
D SUFFIX PLASTIC SOIC PACKAGE CASE 751B-05 ISSUE J
-A-
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019
16
9
-B-
1 8
P
8 PL
0.25 (0.010)
M
B
S
G F
K C -T-
SEATING PLANE
R
X 45 _
M D
16 PL M
J
0.25 (0.010)
TB
S
A
S
DIM A B C D F G J K M P R
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SN74LS253
Notes
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SN74LS253
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
North America Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: ONlit@hibbertco.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada EUROPE: LDC for ON Semiconductor - European Support German Phone: (+1) 303-308-7140 (M-F 2:30pm to 5:00pm Munich Time) Email: ONlit-german@hibbertco.com French Phone: (+1) 303-308-7141 (M-F 2:30pm to 5:00pm Toulouse Time) Email: ONlit-french@hibbertco.com English Phone: (+1) 303-308-7142 (M-F 1:30pm to 5:00pm UK Time) Email: ONlit@hibbertco.com ASIA/PACIFIC: LDC for ON Semiconductor - Asia Support Phone: 303-675-2121 (Tue-Fri 9:00am to 1:00pm, Hong Kong Time) Toll Free from Hong Kong 800-4422-3781 Email: ONlit-asia@hibbertco.com JAPAN: ON Semiconductor, Japan Customer Focus Center 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-8549 Phone: 81-3-5487-8345 Email: r14153@onsemi.com Fax Response Line: 303-675-2167 800-344-3810 Toll Free USA/Canada ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative.
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SN74LS253/D

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