74LCX157 Low voltage CMOS Quad 2 channel multiplexer with 5V tolerant inputs Features ■ 5V tolerant inputs ■ High speed: – tPD = 6.0ns (Max) at VCC = 3V ■ Power down protection on inputs and outputs ■ Symmetrical output impedance: – |IOH| = IOL = 24mA (Min) at VCC = 3V ■ PCI bus levels guaranteed at 24mA ■ Balanced propagation delays: – tPLH ≅ tPHL SO-16 TSSOP16 Description The 74LCX157 is a low voltage 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. ■ Operating voltage range: – VCC (Opr) = 2.0V to 3.6V ■ Pin and function compatible with 74 series 157 ■ Latch-up performance exceeds 500mA (JESD 17) ■ ESD performance: – HBM > 2000V (MIL STD 883 method 3015); MM > 200V It consists of four 2-input digital multiplexer with common select and strobe inputs. It is a noninverting 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. Order codes Part number Package Packaging 74LCX157MTR SO-16 Tape and reel 74LCX157TTR TSSOP16 Tape and reel February 2007 Rev 6 1/17 www.st.com 17 Contents 74LCX157 Contents 1 Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.4 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 74LCX157 1 Logic symbols and I/O equivalent circuit Logic symbols and I/O equivalent circuit Figure 1. IEC logic symbols Figure 2. Input and output equivalent circuit 3/17 Pin settings 74LCX157 2 Pin settings 2.1 Pin connection Figure 3. 2.2 Pin connection (top through view) Pin description Table 1. Pin description 4/17 Pin N° Symbol Name and function 1 SELECT Common data select inputs 2, 5, 11, 14 1A to 4A Data inputs from source A 3, 6, 10, 13 1B to 4B Data inputs from source B 4, 7, 9, 12 1Y to 4Y Multiplexer outputs 15 STROBE Strobe input 8 GND Ground (0V) 16 VCC Positive supply voltage 74LCX157 2.3 Pin settings Truth table Table 2. Truth table Inputs STROBE SELECT A B Y H X X X L L L L X L L L H X H L H X L L L H X H H Note: X : Do not care 2.4 Logic diagram Figure 4. Note: Output Logic diagram This logic diagram has not to be used to estimate propagation delays 5/17 Maximum rating 3 74LCX157 Maximum rating stressing the device above the rating listed in the “absolute maximum ratings” table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. refer also to the STMicroelectronics sure program and other relevant quality documents. Table 3. Absolute maximum ratings Symbol Value Unit Supply voltage -0.5 to +7.0 V VI DC input voltage -0.5 to +7.0 V VO DC output voltage (VCC = 0V) -0.5 to +7.0 V VO DC output voltage (high or low state) (1) -0.5 to VCC + 0.5 V IIK DC input diode current -50 mA IOK DC output diode current (2) -50 mA IO DC output current ± 50 mA ICC DC supply current per supply pin ± 100 mA IGND DC ground current per supply pin ± 100 mA Tstg Storage temperature -65 to +150 °C 300 °C Value Unit 2.0 to 3.6 V VCC TL Parameter Lead temperature (10 sec) 1. IO absolute maximum rating must be observed 2. VO < GND 3.1 Recommended operating conditions Table 4. Recommended operating conditions Symbol VCC Parameter Supply voltage (1) VI Input voltage 0 to 5.5 V VO Output voltage (VCC = 0V) 0 to 5.5 V VO Output voltage (high or low state) 0 to VCC V IOH, IOL High or low level output current (VCC = 3.0 to 3.6V) ± 24 mA IOH, IOL High or low level output current (VCC = 2.7V) ± 12 mA -40 to 85 °C 0 to 10 ns/V Top dt/dv Operating temperature Input rise and fall time (2) 1. Truth table guaranteed: 1.5V to 3.6V 2. VIN from 0.8V to 2V at VCC = 3.0V 6/17 74LCX157 4 Electrical characteristics Electrical characteristics Table 5. DC specifications Test condition Symbol Parameter VIH High level input voltage VIL Low level input voltage VOH -40 to 85°C VCC (V) Min Unit Max 2.0 V 2.7 to 3.6 0.8 2.7 to 3.6 IO = -100µA VCC-0.2 2.7 IO = -12mA 2.2 IO = -18mA 2.4 IO = -24mA 2.2 High level output voltage 3.0 VOL Value V 2.7 to 3.6 IO = 100µA 0.2 2.7 IO = 12mA 0.4 IO = 16mA 0.4 IO = 24mA 0.55 Low level output voltage 3.0 V V II Input leakage current 2.7 to 3.6 VI = 0 to 5.5V ±5 µA Ioff Power OFF leakage current 0 VI or VO = 5.5V 10 µA Quiescent supply current VI = VCC or GND 10 ICC VI or VO = 3.6 to 5.5V ± 10 VIH = VCC - 0.6V 500 ∆ICC I incr. per Input 2.7 to 3.6 2.7 to 3.6 µA µA Table 6. Dynamic switching characteristics Test condition Symbol VOLP VOLV Parameter Dynamic low level quiet output (1) TA = 25 °C VCC (V) 3.3 Value Min CL = 50pF VIL = 0V, VIH = 3.3V Typ Unit Max 0.8 V -0.8 1. Number of outputs defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is measured in the LOW state. 7/17 Electrical characteristics 74LCX157 Table 7. AC electrical characteristics Test condition Symbol Parameter tPLH tPHL Propagation delay time A, B to Y tPLH tPHL Propagation delay time SELECT to Y tOSLH tOSHL Output to output skew time (1) (2) VCC (V) Value CL (pF) RL (Ω) ts = tr (ns) 50 500 2.5 -40 to 85 °C Min 2.7 Unit Max 6.5 ns 3.0 to 3.6 1.5 2.7 6.0 8.0 50 500 2.5 ns 3.0 to 3.6 1.5 3.0 to 3.6 50 500 2.5 7.0 1.0 ns 1. Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching in the same direction, either HIGH or LOW (tOSLH = | tPLHm - tPLHn|, tOSHL = | tPHLm - tPHLn|) 2. Parameter guaranteed by design Table 8. Capacitive characteristics Test condition Symbol Parameter CIN Input capacitance CPD Power dissipation capacitance (1) Value TA = 25 °C VCC (V) Min Typ Unit Max 3.3 VIN = 0 to VCC 6 pF 3.3 fIN = 10MHz VIN = 0 or VCC 25 pF 1. CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/4 8/17 74LCX157 5 Test circuit Test circuit Figure 5. Test circuit CL = 50pF or equivalent (includes jig and probe capacitance) RL = 500Ω or equivalent RT = ZOUT of pulse generator (typically 50Ω) 9/17 Waveforms 6 10/17 74LCX157 Waveforms Figure 6. Propagation delay for inverting outputs (f = 1MHz; 50% duty cycle) Figure 7. Propagation delay for non-inverting outputs (f = 1MHz; 50% duty cycle) 74LCX157 7 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 11/17 Package mechanical data 74LCX157 SO-16 MECHANICAL DATA DIM. mm. MIN. TYP A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.25 a2 0.004 0.010 0.46 0.013 0.018 0.25 0.007 1.64 b 0.35 b1 0.19 C MAX. 0.063 0.5 0.010 0.019 c1 45° (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.62 0.024 8° (max.) 0016020D 12/17 74LCX157 Package mechanical data TSSOP16 MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. MAX. 1.2 A1 0.05 A2 0.8 b 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 D 4.9 5 5.1 0.193 0.197 0.201 E 6.2 6.4 6.6 0.244 0.252 0.260 E1 4.3 4.4 4.48 0.169 0.173 0.176 1 e 0.65 BSC K 0˚ L 0.45 A 0.60 0.0256 BSC 8˚ 0˚ 0.75 0.018 8˚ 0.024 0.030 A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 0080338D 13/17 Package mechanical data 74LCX157 Tape & Reel SO-16 MECHANICAL DATA mm. inch DIM. MIN. A MAX. MIN. 330 13.2 TYP. MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 14/17 TYP 0.504 22.4 0.519 0.882 Ao 6.45 6.65 0.254 0.262 Bo 10.3 10.5 0.406 0.414 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 74LCX157 Package mechanical data Tape & Reel TSSOP16 MECHANICAL DATA mm. inch DIM. MIN. A TYP MAX. MIN. 330 MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 TYP. 0.504 22.4 0.519 0.882 Ao 6.7 6.9 0.264 0.272 Bo 5.3 5.5 0.209 0.217 Ko 1.6 1.8 0.063 0.071 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 15/17 Revision history 8 74LCX157 Revision history Table 9. Revision history 16/17 Date Revision Changes 15-Sep-2004 5 Ordering Codes Revision - pag. 1. 06-Feb-2007 6 Document reformatted, temperature ranges updated 74LCX157 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. © 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 17/17