|
If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
Datasheet File OCR Text: |
(R) 74LCX157 LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER WITH 5V TOLERANT INPUTS PRELIMINARY DATA s s s s s s s s s s 5V TOLERANT INPUTS HIGH SPEED: tPD = 5.2 ns (MAX.) at VCC = 3V POWER-DOWN PROTECTION ON INPUTS AND OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN) PCI BUS LEVELS GUARANTEED AT 24mA BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2.0V to 3.6V (1.5V Data Retention) PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 157 LATCH-UP PERFORMANCE EXCEEDS 500mA ESD PERFORMANCE: HBM >2000V; MM > 200V M1 (Micro Package) T (TSSOP Package) ORDER CODES : 74LCX157M 74LCX157T DESCRIPTION The 74LCX157 is an high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power and high speed 3.3V applications. it can be interfaced to 5V signal environment for inputs. It consists of four 2-input digital multiplexers with PIN CONNECTION AND IEC LOGIC SYMBOLS common select and strobe inputs. It is a non-inverting multiplexer. When the STROBE input is held high, selection of data is inhibited and all the outputs become low. The SELECT decoding determines whether the A or B inputs get routed to their corresponding Y outputs.It has same speed performance at 3.3V than 5V, AC/ACT family, combined with a lower power consumption. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. February 1999 1/9 74LCX157 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1 2, 5, 11, 14 3, 6, 10, 13 4, 7, 9, 12 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y STROBE GND VCC NAME AND FUNCT ION Common Data Select Input Data Inputs From Source A Data Inputs From Source B Multiplexer Outputs Strobe Input Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT STRO BE SELECT H L L L L X:"H" or "L" OUTPUT A X L H X X B X X X L H Y L L H L H X L L H H LOGIC DIAGRAM 2/9 74LCX157 ABSOLUTE MAXIMUM RATINGS Symbol VCC VI VO VO IIK IOK IO ICC IGND Tstg TL Supply Voltage DC Input Voltage DC Output Voltage (VCC=0V) DC Output Voltage (High or Low State) (note1) DC Input Diode Current DC Output Diode Current (note2) DC Output Source/Sink Current DC Supply Current per Supply Pin DC Ground Current per Supply Pin Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to + 7.0 -0.5 to + 7.0 -0.5 to + 7.0 -0.5 to VCC + 0.5 - 50 50 50 100 100 -65 to +150 300 Unit V V V V mA mA mA mA mA o o C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 1) IO absolute maximum rating must be observed 2) VO < GND, VO > VCC RECOMMENDED OPERATING CONDITIONS Symbol VCC VI VO VO IOH, IOL IOH, IOL Top dt/dv Input Voltage Output Voltage (V CC=0V) Output Voltage (High or Low State) High or Low Level Output Current (VCC = 3.0 to 3.6V) High or Low Level Output Current (VCC = 2.7 to 3.0V) Operating Temperature: Input Transition Rise or Fall Rate (V CC = 3.0V) (note 2) Parameter Supply Voltage (note 1) Value 2.0 to 3.6 0 to 5.5 0 to 5.5 0 to VCC 24 12 -40 to+85 0 to 10 Unit V V V V mA mA o C ns/V 1) Truth Table guaranteed: 1.5V to3.6V 2) VIN from0.8V to 2.0V 3/9 74LCX157 DC SPECIFICATIONS Symb ol Parameter V CC (V) VIH VIL VOH High Level Input Voltage Low Level Input Voltage High Level Output Voltage 2.7 to 3.6 2.7 to 3.6 2.7 3.0 VOL Low Level Output Voltage 2.7 to 3.6 2.7 3.0 3.0 II Ioff ICC Input Leakage Current Power Off Leakage Current Quiescent Supply Current 2.7 to 3.6 0 2.7 to 3.6 VI = VIH or VIL IO=-100 A IO=-12 mA IO=-18 mA IO=-24 mA VI = VIH or VIL IO=100 A IO=12 mA IO=16 mA IO=24 mA VI = 0 to 5.5 V VI orVO = 5.5V VI = VCC orGND VI orVO = 3.6 to 5.5V ICC ICC incr. per input 2.7 to 3.6 VIH = VCC -0.6V Test Co nditi ons Value -40 to 85 o C Min. 2.0 0.8 VCC-0.2 2.2 2.4 2.2 0.2 0.4 0.4 0.55 5 100 10 10 500 A A A A V V Max. V V Un it DYNAMIC SWITCHING CHARACTERISTICS Symb ol Parameter V CC (V) VOLP VOLV Dynamic Low Voltage Quiet Output (note 1) 3.3 CL = 50 pF VIL = 0 V VIH = 3.3V Test Con dition s Min . Value T A = 25 o C T yp. 0.8 -0.8 V Max. Un it 1) Number ofoutputs defined as "n". Measured with"n-1" outputs switching from HIGH to LOW or LOW t o HIGH. The remaining output is measured in the LOW state. AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 , Input tr = tf = 2.5 ns) Symb ol Parameter V CC (V) tPLH tPHL tPLH tPHL tPLH tPHL tOSLH tOSHL Propagation Delay Time A, B to Y Propagation Delay Time SELECT to Y Propagation Delay Time STROBE to Y Output to Output Skew Time (note 1, 2) Test Con dition Waveform Value -40 to 85 o C Min. Max. 6.5 1.5 6.0 1.5 1.5 8.0 7.0 7.0 8.0 1.0 Un it 2.7 3.0 to 3.6 2.7 3.0 to 3.6 2.7 3.0 to 3.6 3.0 to 3.6 1 1 1 ns ns ns ns 1) Skew is defined as the absolute value of the difference between the actual propagation delay for any twooutputs of the same device switching in the same direction, either HIGH or LOW (tOSLH = |tPLHm - tPLHn|, tOSHL = |tPHLm - tpHLn|) 2) Parameter guaranteed by design 4/9 74LCX157 CAPACITIVE CHARACTERISTICS Symb ol Parameter V CC (V) CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance (note 1) 3.3 3.3 3.3 VIN = 0 to VCC VIN = 0 to VCC fIN = 10MHz VIN = 0 or VCC Test Co nditi ons Min. Valu e T A = 25 oC T yp. 7 8 25 Max. pF pF pF Un it 1) CPD isdefined as the value of the IC'sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. Average operting current can be obtained by the following equation. I CC(opr) = CPD * VCC * fIN + ICC/4 (per channel) TEST CIRCUIT CL = 50 pF or equivalent (includes jigand probe capacitance) RL = 500 or equivalent RT = ZOUT of pulse generator (typically 50) WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS 5/9 74LCX157 WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS 6/9 74LCX157 SO-16 MECHANICAL DATA DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 9.8 5.8 1.27 8.89 4.0 5.3 1.27 0.62 8 (max.) 0.149 0.181 0.019 10 6.2 0.35 0.19 0.5 45 (typ.) 0.385 0.228 0.050 0.350 0.157 0.208 0.050 0.024 0.393 0.244 0.1 mm TYP. MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.004 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010 P013H 7/9 74LCX157 TSSOP16 MECHANICAL DATA mm MIN. A A1 A2 b c D E E1 e K L 0o 0.50 0.05 0.85 0.19 0.09 4.9 6.25 4.3 5 6.4 4.4 0.65 BSC 4o 0.60 8o 0.70 0o 0.020 0.10 0.9 TYP. MAX. 1.1 0.15 0.95 0.30 0.20 5.1 6.5 4.48 0.002 0.335 0.0075 0.0035 0.193 0.246 0.169 0.197 0.252 0.173 0.0256 BSC 4o 0.024 8o 0.028 0.004 0.354 MIN. inch TYP. MAX. 0.433 0.006 0.374 0.0118 0.0079 0.201 0.256 0.176 DIM. A A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 8/9 74LCX157 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a trademark of STMicroelectronics (c) 1999 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com . 9/9 |
Price & Availability of 74LCX157 |
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
[Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |