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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 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
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. 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 74LCX157MTR 74LCX157TTR Package SO-16 TSSOP16 Packaging Tape and reel Tape and reel
February 2007
Rev 6
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Contents
74LCX157
Contents
1 2 Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 2.2 2.3 2.4 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 5 6 7 8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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74LCX157
Logic symbols and I/O equivalent circuit
1
Logic symbols and I/O equivalent circuit
Figure 1. IEC logic symbols
Figure 2.
Input and output equivalent circuit
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Pin settings
74LCX157
2
2.1
Pin settings
Pin connection
Figure 3. Pin connection (top through view)
2.2
Pin description
Table 1. Pin description
Pin N 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 function Common data select inputs Data inputs from source A Data inputs from source B Multiplexer outputs Strobe input Ground (0V) Positive supply voltage
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74LCX157
Pin settings
2.3
Truth table
Table 2. Truth table
Inputs STROBE H L L L L SELECT X L L H H A X L H X X B X X X L H Output Y L L H L H
Note:
X : Do not care
2.4
Logic diagram
Figure 4. Logic diagram
Note:
This logic diagram has not to be used to estimate propagation delays
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Maximum rating
74LCX157
3
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 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) (1) DC input diode current DC output diode current (2) DC output 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 C C
1. IO absolute maximum rating must be observed 2. VO < GND
3.1
Recommended operating conditions
Table 4. Recommended operating conditions
Symbol VCC VI VO VO IOH, IOL IOH, IOL Top dt/dv Supply voltage Input voltage Output voltage (VCC = 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 = 2.7V) Operating temperature Input rise and fall time
(2) (1)
Parameter
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 C ns/V
1. Truth table guaranteed: 1.5V to 3.6V 2. VIN from 0.8V to 2V at VCC = 3.0V
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74LCX157
Electrical characteristics
4
Electrical characteristics
Table 5. DC specifications
Test condition Symbol Parameter VCC (V) 2.7 to 3.6 Low level input voltage 2.7 to 3.6 2.7 VOH High level output voltage 3.0 2.7 to 3.6 2.7 VOL Low level output voltage 3.0 II Ioff ICC ICC Input leakage current Power OFF leakage current Quiescent supply current I incr. per Input 2.7 to 3.6 0 IO = -100A IO = -12mA IO = -18mA IO = -24mA IO = 100A IO = 12mA IO = 16mA IO = 24mA VI = 0 to 5.5V VI or VO = 5.5V VI = VCC or GND VI or VO = 3.6 to 5.5V 2.7 to 3.6 VIH = VCC - 0.6V VCC-0.2 2.2 V 2.4 2.2 0.2 0.4 V 0.4 0.55 5 10 10 10 500 A A A A 0.8 V Value -40 to 85C Min 2.0 Max V Unit
VIH VIL
High level input voltage
2.7 to 3.6
Table 6. Dynamic switching characteristics
Test condition Symbol Parameter VCC (V) 3.3 CL = 50pF VIL = 0V, VIH = 3.3V Value TA = 25 C Min Typ 0.8 V -0.8 Max Unit
VOLP VOLV
Dynamic low level quiet output (1)
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.
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Electrical characteristics
74LCX157
Table 7. AC electrical characteristics
Test condition Symbol Parameter VCC (V) 2.7 50 3.0 to 3.6 2.7 50 3.0 to 3.6 3.0 to 3.6 50 500 2.5 500 2.5 1.5 7.0 1.0 ns 500 2.5 1.5 6.0 8.0 ns CL (pF) RL () ts = tr (ns) Value -40 to 85 C Min Max 6.5 ns Unit
tPLH tPHL
Propagation delay time A, B to Y Propagation delay time SELECT to Y Output to output skew time (1) (2)
tPLH tPHL tOSLH tOSHL
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 VCC (V) 3.3 3.3 VIN = 0 to VCC fIN = 10MHz VIN = 0 or VCC Value TA = 25 C Min Typ 6 25 Max pF pF Unit
CIN CPD
Input capacitance Power dissipation capacitance (1)
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
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74LCX157
Test circuit
5
Test circuit
Figure 5. Test circuit
CL = 50pF or equivalent (includes jig and probe capacitance) RL = 500 or equivalent RT = ZOUT of pulse generator (typically 50)
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Waveforms
74LCX157
6
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)
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74LCX157
Package mechanical data
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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
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Package mechanical data
74LCX157
SO-16 MECHANICAL DATA
DIM. 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. MIN. TYP MAX. 1.75 0.25 1.64 0.46 0.25 0.013 0.007 0.019 0.004 MIN. inch TYP. MAX. 0.068 0.010 0.063 0.018 0.010
0016020D
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74LCX157
Package mechanical data
TSSOP16 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 4.9 6.2 4.3 5 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 5.1 6.6 4.48 0.002 0.031 0.007 0.004 0.193 0.244 0.169 0.197 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.201 0.260 0.176 inch
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
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Package mechanical data
74LCX157
Tape & Reel SO-16 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.45 10.3 2.1 3.9 7.9 12.8 20.2 60 22.4 6.65 10.5 2.3 4.1 8.1 0.254 0.406 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.262 0.414 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
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74LCX157
Package mechanical data
Tape & Reel TSSOP16 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.7 5.3 1.6 3.9 7.9 12.8 20.2 60 22.4 6.9 5.5 1.8 4.1 8.1 0.264 0.209 0.063 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.272 0.217 0.071 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch
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Revision history
74LCX157
8
Revision history
Table 9. Revision history
Date 15-Sep-2004 06-Feb-2007 Revision 5 6 Changes Ordering Codes Revision - pag. 1. Document reformatted, temperature ranges updated
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74LCX157
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