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74LCX245
LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS
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5V TOLERANT INPUTS AND OUTPUTS HIGH SPEED: tPD = 7 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 245 LATCH-UP PERFORMANCE EXCEEDS 500mA ESD PERFORMANCE: HBM >2000V; MM > 200V
M (Micro Package)
T (TSSOP Package)
ORDER CODES : 74LCX245M 74LCX245T combined with a lower power consumption. This IC is intended for two-way asynchronous communication between data buses; the direction of data trasmission is determined by DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. IT IS PROHIBITED TO APPLY A SIGNAL TO A TERMINAL WHEN IT IS IN OUTPUT MODE AND WHEN A BUS TERMINAL IS FLOATING (HIGH IMPEDANCE STATE) IT IS REQUESTED TO FIX THE INPUT LEVEL BY MEANS OF EXTERNAL PULL DOWN OR PULL UP RESISTOR.
DESCRIPTION The LCX245 is a low voltage CMOS OCTAL BUS TRANSCEIVER (3-STATE) 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 both inputs and outputs. It has same speed performance at 3.3V than 5V AC/ACT family, PIN CONNECTION AND IEC LOGIC SYMBOLS
March 1999
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LCX245
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No 1 2, 3, 4, 5, 6, 7, 8, 9 18, 17, 16, 15, 14, 13, 12, 11 19 10 20 SYMBOL DIR A1 to A8 B1 to B8 NAME AND FUNCT ION Directional Control Data Inputs/Outputs Data Inputs/Outputs
TRUTH TABLE
INPUT G L L H
X:"H" or "L" Z: High impedance
F UNCTION DIR L H X A BUS OUTPUT INPUT Z B BUS INPUT OUTPUT Z
OUT PUT A=B B=A Z
G GND VCC
Output Enable Input Ground (0V) Positive Supply Voltage
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
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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
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LCX245
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VI VO VO IOH, IOL IOH, IOL Top dt/dv 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 = 2.7 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
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C
ns/V
1) Truth Table guaranteed: 1.5V to3.6V 2) VIN from0.8V to 2.0V
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 IOZ Ioff ICC Input Leakage Current 3 State Output Leakage Current Power Off Leakage Current Quiescent Supply Current 2.7 to 3.6 2.7 to 3.6 0 2.7 to 3.6 VI = VI H or V IL Test Co nditi ons Value -40 to 85 C Min. 2.0 0.8 IO=-100 A V CC -0.2 IO=-12 mA IO=-18 mA IO=-24 mA VI = VI H or V IL IO=100 A IO=12 mA IO=16 mA IO=24 mA VI = 0 to 5.5 V VI = VIH or VIL VO = 0 to 5.5V VI or VO = 5.5V VI = VCC or GND VI or VO = 3.6 to 5.5V ICC ICC incr. per input 2.7 to 3.6 VIH = VCC -0.6V 2.2 2.4 2.2 0.2 0.4 0.4 0.55 5 5 100 10 10 500 A A A A A V V Max. V V
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DYNAMIC SWITCHING CHARACTERISTICS
Symb ol Parameter V CC (V) VOLP VOLV Dynamic Low Voltage Quiet Output (note 1) 3.3 C L = 50 pF V IL = 0 V V IH = 3.3V Test Con dition s Min . Value T A = 25 C T yp. 0.8 -0.8 V Max.
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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.
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LCX245
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 , Input tr = tf = 2.5 ns)
Symb ol Parameter V CC (V) tPLH tPHL tPZL tPZH tPLZ tPHZ tOSLZ tOSHL Propagation Delay Time Output Enable Time Output Disable Time Output to Output Skew Time (note 1, 2) 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 Test Con dition Waveform Value -40 to 85 o C Min. 1.5 1.5 1.5 1.5 1.5 1.5 Max. 8.0 7.0 9.5 8.5 8.5 7.5 1.0 Un it
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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
CAPACITIVE CHARACTERISTICS
Symb ol Parameter V CC (V) C IN C i/o CPD Input Capacitance I/O 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 Valu e T A = 25 oC Min. T yp. 6 12 45 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. ICC(opr) = CPD * VCC * fIN + ICC/n (per circuit)
TEST CIRCUIT
T EST tPLH , tPHL tPZL , tPLZ tPZH , tPHZ
CL = 50 pF or equivalent (includes jigand probe capacitance) RL = R1 = 500 orequivalent RT = ZOUT of pulse generator (typically 50)
SW IT CH Open 6V GND
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LCX245
WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
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LCX245
SO-20 MECHANICAL DATA
DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F L M S 7.40 0.50 12.60 10.00 1.27 11.43 7.60 1.27 0.75 8 (max.) 0.291 0.19 13.00 10.65 0.35 0.23 0.50 45 (typ.) 0.496 0.393 0.050 0.450 0.299 0.050 0.029 0.512 0.419 0.10 mm TYP. MAX. 2.65 0.20 2.45 0.49 0.32 0.013 0.009 0.020 0.004 MIN. inch TYP. MAX. 0.104 0.007 0.096 0.019 0.012
P013L
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LCX245
TSSOP20 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 6.4 6.25 4.3 6.5 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 0.2 6.6 6.5 4.48 0.002 0.335 0.0075 0.0035 0.252 0.246 0.169 0.256 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 0.260 0.256 0.176
DIM.
A
A2 A1 b e K c L E
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E1
PIN 1 IDENTIFICATION
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LCX245
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 .
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