HC257

74VHC257 STMICROELECTRONICS | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 14

Technical content

I HIGH SPEED: tPD = 3.7ns (TYP.) at VCC = 5V I LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C I HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) I POWER DOWN PROTECTION ON INPUTS I SYMMETRICAL OUTPUT IMPEDANCE: OH | = IOL = 8mA (MIN) I BALANCED PROPAGATION DELAYS: t PLH ≅ tPHL I OPERATING VOLTAGE RANGE: V CC (OPR) = 2V to 5.5V I PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

I IMPROVED LATCH-UP IMMUNITY I LOW NOISE: V OLP = 0.8V (MAX.)

DESCRIPTION

The 74VHC257 is an advanced high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C 2MOS technology. It is composed of four independent 2-channel multiplexers with common SELECT and ENABLE (OE ) INPUT. The VHC257 is a non-inverting multiplexer. When the ENABLE INPUT is held "High", all outputs become in high impedance state. If SELECT INPUT is held "Low", "A" data is selected, when SELECT INPUT is "High", "B" data is chosen. Power down protection is provided on all inputs and 0 to 7V can be accepted on inputs with no regard to the supply voltage. This device can be used to interface 5V to 3V. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. 74VHC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) Figure 1: Pin Connection And IEC Logic Symbols Table 1: Order Codes PACKAGE T & R SOP 74VHC257MTR TSSOP 74VHC257TTR TSSOPSOP Rev. 4

Figure 2: Input Equivalent Circuit Table 2: Pin Description Table 3: Truth Table X : Don’t Care Z : High Impedance Figure 3: Logic Diagram This logic diagram has not be used to estimate propagation delays PIN N° SYMBOL NAME AND FUNCTION

1 SELECT Common Data Select

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 3 State Multiplexer Outputs

15 OE 3 State Output Enable

Inputs (Active LOW)

8 GND Ground (0V)

16 V CC Positive Supply Voltage

Table 4: Absolute Maximum Ratings Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied Table 5: Recommended Operating Conditions 1) VIN from 30% to 70% of VCC Symbol Parameter Value Unit VCC Supply Voltage -0.5 to +7.0 V VI DC Input Voltage -0.5 to +7.0 V VO DC Output Voltage -0.5 to V CC + 0.5 V IIK DC Input Diode Current - 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 25 mA ICC or IGND DC V CC or Ground Current ± 50 mA Tstg Storage Temperature -65 to +150 °C TL Lead Temperature (10 sec) 300 °C Symbol Parameter Value Unit VCC Supply Voltage 2 to 5.5 V VI Input Voltage 0 to 5.5 V VO Output Voltage 0 to V CC V Top Operating Temperature -55 to 125 °C dt/dv Input Rise and Fall Time (note 1) (VCC = 3.3 ± 0.3V) (VCC = 5.0 ± 0.5V) 0 to 100 0 to 20 ns/V

Table 6: DC Specifications Symbol Parameter Test Condition Value UnitVCC (V) TA = 25°C -40 to 85°C -55 to 125°C VIH High Level Input Voltage 2.0 1.5 1.5 1.5 V3.0 to 5.5 0.7VCC 0.7VCC 0.7VCC VIL Low Level Input Voltage 2.0 0.5 0.5 0.5 V3.0 to 5.5 0.3VCC 0.3VCC 0.3VCC VOH High Level Output Voltage V 3.0 IO =-4 mA 2.58 2.48 2.4 4.5 IO =-8 mA 3.94 3.8 3.7 VOL Low Level Output Voltage V 3.0 IO =4 mA 0.36 0.44 0.55 4.5 IO =8 mA 0.36 0.44 0.55 IOZ High Impedance Output Leakage Current 5.5 V I = VIH or VIL VO = VCC or GND ±0.25 ± 2.5 ± 2.5 µA II Input Leakage Current 0 to 5.5 VI = 5.5V or GND ± 0.1 ± 1 ± 1 µA ICC Quiescent Supply Current 5.5 VI = VCC or GND 44 0 4 0 µA

Table 7: AC Electrical Characteristics (Input tr = tf = 3ns) (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ± 0.5V Table 8: Capacitive Characteristics 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 (per channel) Symbol Parameter Test Condition Value UnitVCC (V) C L (pF) TA = 25°C -40 to 85°C -55 to 125°C tPLH tPHL Propagation Delay Time A, B to Y tPLH tPHL Propagation Delay Time SELECT to Y tPZL tPZH Output Enable Time tPLZ tPHZ Output Disable Time ns Symbol Parameter Test Condition Value UnitTA = 25°C -40 to 85°C -55 to 125°C C IN Input Capacitance 61 0 1 0 1 0 p F C OUT Output Capacitance 8p F C PD Power Dissipation Capacitance (note 1) 18 pF

Table 9: Dynamic Switching Characteristics 1) Worst case package. 2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n-1) outputs switching and one output at GND. 3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz. Figure 4: Test Circuit C L =15/ 50pF or equivalent (includes jig and probe capacitance) R L = R1 = 1KΩ or equivalent R T = ZOUT of pulse generator (typically 50Ω ) Symbol Parameter Test Condition Value UnitVCC (V) TA = 25°C -40 to 85°C -55 to 125°C VOLP Dynamic Low Voltage Quiet Output (note 1, 2) 5.0 C L = 50 pF 0.3 0.8 VVOLV -0.8 -0.3 VIHD Dynamic High Voltage Input (note 1, 3) 5.0 3.5 V V ILD Dynamic Low Voltage Input (note 1, 3) 5.0 1.5 V TEST SWITCH tPLH , tPHL Open tPZL , tPLZ VCC tPZH , tPHZ GND

Figure 7: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)

DIM. mm. inch A 1.75 0.068 a1 0.1 0.25 0.004 0.010 a2 1.64 0.063 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 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 0.62 0.024 S8 ° (max.) SO-16 MECHANICAL DATA 0016020D

DIM. mm. inch A 1.2 0.047 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 e 0.65 BSC 0.0256 BSC K0 ˚ 8 ˚0 ˚ 8 ˚ TSSOP16 MECHANICAL DATA c Eb A2A D PIN 1 IDENTIFICATION LKe 0080338D

DIM. mm. inch A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 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 Tape & Reel SO-16 MECHANICAL DATA

DIM. mm. inch A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 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 Tape & Reel TSSOP16 MECHANICAL DATA

Table 10: Revision History Date Revision Description of Changes 12-Nov-2004 4 Order Codes Revision - pag. 1.

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. Specifications 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 registered trademark of STMicroelectronics All other names are the property of their respective owners © 2004 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