SN54/74LS253 DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The LSTTL/ MSI SN54/ 74LS253 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 Motorola TTL families. • • • • DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY Schottky Process for High Speed Multifunction Capability Non-Inverting 3-State Outputs Input Clamp Diodes Limit High Speed Termination Effects J SUFFIX CERAMIC CASE 620-09 16 CONNECTION DIAGRAM DIP (TOP VIEW) 1 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. PIN NAMES 16 1 1 LOADING (Note a) Common Select Inputs D SUFFIX SOIC CASE 751B-03 16 ORDERING INFORMATION LOW HIGH S0, S1 Multiplexer A E0a I0a – I3a Za Multiplexer B E0b I0b – I3b Zb N SUFFIX PLASTIC CASE 648-08 0.5 U.L. 0.25 U.L. Output Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output (Note b) 0.5 U.L. 0.5 U.L. 65 (25) U.L. 0.25 U.L. 0.25 U.L. 15 (7.5) U.L. Output Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output (Note b) 0.5 U.L. 0.5 U.L. 65 (25) U.L. 0.25 U.L. 0.25 U.L. 15 (7.5) U.L. SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC LOGIC SYMBOL NOTES: a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b) The Output LOW drive factor is 7.5 U.L. for Military (54) and 15 U.L. for Commercial (74) Temperature Ranges. The Output HIGH drive factor is 25 U.L. for Military (54) and 65 U.L. for Commercial (74) Temperature Ranges. FAST AND LS TTL DATA 5-416 SN54/74LS253 LOGIC DIAGRAM 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: 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. 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) TRUTH TABLE SELECT INPUTS DATA INPUTS OUTPUT ENABLE OUTPUT S0 S1 I0 I1 I2 I3 E0 Z X L L H H L L H H X L L L L H H H H X L H X X X X X X X X X L H X X X X X X X X X L H X X X X X X X X X L H H L L L L L L L L (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. FAST AND LS TTL DATA 5-417 SN54/74LS253 GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 – 55 0 25 25 125 70 °C IOH Output Current — High 54 74 – 1.0 – 2.6 mA IOL Output Current — Low 54 74 12 24 mA DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol Min Parameter VIH Input HIGH Voltage VIL Input LOW Voltage VIK Input Clamp Diode Voltage VOH Output HIGH Voltage VOL Output LOW Voltage IOZH Typ Max Unit 2.0 54 V Guaranteed Input HIGH Voltage for All Inputs V Guaranteed Input LOW Voltage for All Inputs V VCC = MIN, IIN = – 18 mA 0.7 74 0.8 – 0.65 – 1.5 Test Conditions 54 2.4 3.4 V 74 2.4 3.1 V VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VCC = VCC MIN, VIN = VIL or VIH per Truth Table 54, 74 0.25 0.4 V IOL = 12 mA 74 0.35 0.5 V IOL = 24 mA Output Off Current HIGH 20 µA VCC = MAX, VOUT = 2.7 V IOZL Output Off Current LOW – 20 µA VCC = MAX, VOUT = 0.4 V IIH Input HIGH Current IIL Input LOW Current IOS Short Circuit Current (Note 1) ICC Power Supply Current – 30 20 µA VCC = MAX, VIN = 2.7 V 0.1 mA VCC = MAX, VIN = 7.0 V – 0.4 mA VCC = MAX, VIN = 0.4 V – 130 mA VCC = MAX 12 mA VCC = MAX, VE = 0 V 14 mA 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 = 25°C, VCC = 5.0 V) See SN54LS251 for Waveforms Limits Typ Max Unit tPLH tPHL Symbol Propagation Delay, Data to Output Parameter 17 13 25 20 ns Figure 1 tPLH tPHL Propagation Delay, Select to Output 30 21 45 32 ns Figure 1 tPZH tPZL Output Enable Time 15 15 28 23 ns Figures 4, 5 tPHZ tPLZ Output Disable Time 27 18 41 27 ns Figures 3, 5 Min FAST AND LS TTL DATA 5-418 Test Conditions CL = 45 pF, RL = 667 Ω CL = 5.0 pF, RL = 667 Ω Case 751B-03 D Suffix 16-Pin Plastic SO-16 -A- "! ! " " ! " # 1 %# ) ! !" $ !" 8 C -T- D M K " ! #! J F ! Case 648-08 N Suffix 16-Pin Plastic R X 45° G " ! ) #! P ! " " 9 -B- ! 16 & ! ! ° ° ° ° ( ( ( ( "! ! " " ! ! ' " " ! ' ! " # & -A- 16 9 1 8 ! ! $ ! B # ) " ! " # ) !" $ !" ) F L C S -T- K H G M J D " Case 620-09 J Suffix 16-Pin Ceramic Dual In-Line -A- ! ! ! ! ° ° ° ° "! ! " 16 " ) " L K M N J G D " $ " $ ! " " ! ! FAST AND LS TTL DATA 5-419 & # ) !" $ !" ) -T $ " " C F & 8 E ! ! ! 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Literature Distribution Centers: USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England. JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. ◊ FAST AND LS TTL DATA 5-420