74LVQ245 LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER WITH (3-STATE) ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.7 ns (TYP.) at VCC = 3.3 V COMPATIBLE WITH TTL OUTPUTS LOW POWER DISSIPATION: ICC = 5 µA (MAX.) at TA=25°C LOW NOISE: VOLP = 0.5V (TYP.) at VCC = 3.3V 75Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 12mA (MIN) at VCC = 3.0 V PCI BUS LEVELS GUARANTEED AT 24 mA BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC(OPR) = 2V to 3.6V (1.2V Data Retention) PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245 IMPROVED LATCH-UP IMMUNITY DESCRIPTION The 74LVQ245 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 low noise 3.3V applications. SOP TSSOP Table 1: Order Codes PACKAGE T&R SOP TSSOP 74LVQ245MTR 74LVQ245TTR This IC is intended for two-way asynchronous communication between data buses and the direction of data transmission 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. All floating bus terminals during High Impedance State must be held HIGH or LOW. Figure 1: Pin Connection And IEC Logic Symbols July 2004 Rev. 5 1/12 74LVQ245 Figure 2: Input Equivalent Circuit Table 2: Pin Description PIN N° SYMBOL 1 2, 3, 4, 5, 6, 7, 8,9 18, 17, 16, 15, 14, 13, 12, 11 19 10 20 DIR A1 to A8 Directional Control Data Inputs/Outputs B1 to B8 Data Inputs/Outputs G GND VCC NAME AND FUNCTION Output Enable Input Ground (0V) Positive Supply Voltage Table 3: Truth Table INPUTS FUNCTION OUTPUT G DIR A BUS B BUS L L H L H X OUTPUT INPUT Z INPUT OUTPUT Z A=B B=A Z X : Don‘t Care Z : High Impedance Table 4: Absolute Maximum Ratings Symbol VCC VI VI/O Parameter Supply Voltage Value Unit -0.5 to +7 V DC Bus I/O Voltage (DIR, G) -0.5 to VCC + 0.5 V DC Bus I/O Voltage -0.5 to VCC + 0.5 ± 20 mA V IIK DC Input Diode Current IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 50 mA ICC or IGND DC VCC or Ground Current Tstg Storage Temperature TL Lead Temperature (10 sec) ± 400 mA -65 to +150 °C 300 °C 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 Symbol Parameter Value Unit VCC Supply Voltage (note 1) 2 to 3.6 V VI Input Voltage (DIR, G) 0 to VCC V VO DC Bus I/O Voltage Top Operating Temperature dt/dv Input Rise and Fall Time VCC = 3.0V (note 2) 1) Truth Table guaranteed: 1.2V to 3.6V 2) VIN from 0.8V to 2V 2/12 0 to VCC V -55 to 125 °C 0 to 10 ns/V 74LVQ245 Table 6: DC Specifications Test Condition Symbol VIH VIL VOH Parameter High Level Input Voltage Low Level Input Voltage High Level Output Voltage TA = 25°C VCC (V) Min. Typ. Max. 2.0 3.0 to 3.6 3.0 Value Low Level Output Voltage 3.0 -55 to 125°C Min. Min. 0.8 IO=-50 µA 2.9 IO=-12 mA 2.58 2.99 2.9 2.9 2.48 2.2 IO=50 µA 0.002 0.1 IO=12 mA 0 0.36 IOZ ICC IOLD IOHD Input Leakage Current High Impedance Output Leakage Current Quiescent Supply Current Dynamic Output Current (note 1, 2) V 0.8 2.48 Unit Max. 2.0 0.8 IO=24 mA II Max. 2.0 IO=-24 mA VOL -40 to 85°C V V 2.2 0.1 0.1 0.44 0.44 0.55 0.55 V 3.6 VI = VCC or GND ± 0.1 ±1 ±1 µA 3.6 VI = VIH or VIL VO = VCC or GND ± 0.3 ±3 ± 10 µA 3.6 VI = VCC or GND 4 40 40 µA 3.6 VOLD = 0.8 V max 36 25 mA VOHD = 2 V min -25 -25 mA 1) Maximum test duration 2ms, one output loaded at time 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 75Ω Table 7: Dynamic Switching Characteristics Test Condition Symbol VOLP VOLV VIHD VILD Parameter Dynamic Low Voltage Quiet Output (note 1, 2) Dynamic High Voltage Input (note 1, 3) Dynamic Low Voltage Input (note 1, 3) Value TA = 25°C VCC (V) Min. 3.3 -0.8 3.3 Typ. Max. 0.5 0.8 -40 to 85°C -55 to 125°C Min. Min. Max. Unit Max. V -0.5 2 V CL = 50 pF 3.3 0.8 V 1) Worst case package. 2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND. 3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3.3V to threshold (VILD), 0V to threshold (VIHD), f=1MHz. 3/12 74LVQ245 Table 8: AC Electrical Characteristics (CL = 50 pF, RL = 500 Ω, Input tr = tf = 3ns) Test Condition Symbol Parameter tPLH tPHL Propagation Delay Time tPZL tPZH Output Enable Time tPLZ tPHZ Output Disable Time tOSLH tOSHL Output To Output Skew Time (note1, 2) Value TA = 25°C VCC (V) Min. Typ. Max. -40 to 85°C -55 to 125°C Min. Min. Max. Max. 2.7 6.7 11.0 13.0 15.0 3.3(*) 2.7 5.7 9.0 10.5 12.0 9.3 15.0 17.5 20.0 3.3(*) 7.5 12.0 14.0 16.0 2.7 7.5 12.0 14.0 16.0 3.3(*) 6.6 10.0 11.5 13.0 2.7 0.5 0.5 1.0 1.0 1.0 1.0 1.0 1.0 (*) 3.3 Unit ns ns ns 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 (*) Voltage range is 3.3V ± 0.3V Table 9: Capacitive Characteristics Test Condition Symbol Parameter Value TA = 25°C VCC (V) Min. Typ. Max. -40 to 85°C -55 to 125°C Min. Min. Max. Unit Max. CIN Input Capacitance 3.3 5 pF CI/O I/O Capacitance 3.3 10 pF CPD Power Dissipation Capacitance (note 1) 3.3 20 pF fIN = 10MHz 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/8 (per circuit) 4/12 74LVQ245 Figure 3: Test Circuit TEST SWITCH tPLH, tPHL Open tPZL, tPLZ 2VCC tPZH, tPHZ Open CL = 50pF or equivalent (includes jig and probe capacitance) RL = R1 = 500Ω or equivalent RT = ZOUT of pulse generator (typically 50Ω) Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle) 5/12 74LVQ245 Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle) 6/12 74LVQ245 SO-20 MECHANICAL DATA DIM. mm. MIN. TYP inch MAX. MIN. TYP. MAX. A 2.35 2.65 0.093 0.104 A1 0.1 0.30 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.60 13.00 0.496 0.512 E 7.4 7.6 0.291 0.299 e 1.27 0.050 H 10.00 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 L 0.4 1.27 0.016 0.050 k 0° 8° 0° 8° ddd 0.100 0.004 0016022D 7/12 74LVQ245 TSSOP20 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. A 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 6.4 6.5 6.6 0.252 0.256 0.260 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 0.0256 BSC 0.60 8˚ 0˚ 0.75 0.018 8˚ 0.024 0.030 A2 A1 b K e L E c D E1 PIN 1 IDENTIFICATION 1 0087225C 8/12 74LVQ245 Tape & Reel SO-20 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 30.4 0.519 1.197 Ao 10.8 11 0.425 0.433 Bo 13.2 13.4 0.520 0.528 Ko 3.1 3.3 0.122 0.130 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 9/12 74LVQ245 Tape & Reel TSSOP20 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 10/12 TYP 0.504 22.4 0.519 0.882 Ao 6.8 7 0.268 0.276 Bo 6.9 7.1 0.272 0.280 Ko 1.7 1.9 0.067 0.075 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 74LVQ245 Table 10: Revision History Date Revision 29-Jul-2004 5 Description of Changes Ordering Codes Revision - pag. 1. 11/12 74LVQ245 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. 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