74VHC245T

® 74VHC245 OCTAL BUS TRANSCEIVER (3-STATE) PRELIMINARY DATA s s s s s s s s s s HIGH SPEED: tPD = 4.0 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON CONTROL INPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245 IMPROVED LATCH-UP IMMUNITY LOW NOISE VOLP = 0.9V (Max.) M (Micro Package) T (TSSOP Package) ORDER CODES : 74VHC245M 74VHC245T used to disable the device so that the busses 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 74VHC245 is an advanced high-speed CMOS OCTAL BUS TRANSCEIVER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. This IC is intended for two-way asynchronous communication between data busses; the direction of data trasmission is determined by the level of the DIR input. The enable input G can be PIN CONNECTION AND IEC LOGIC SYMBOLS June 1999 1/8 74VHC245 INPUT 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 G GND VCC Output Enable Input Ground (0V) Positive Supply Voltage 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 ABSOLUTE MAXIMUM RATINGS Symbol VCC VI VI/O VO IIK IOK IO Tstg TL Supply Voltage DC Input Voltage (DIR, G) Bus I/O Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 - 20 ± 20 ± 25 ± 75 -65 to +150 300 Unit V V V V mA mA mA mA o o ICC or IGND DC VCC or Ground Current C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. RECOMMENDED OPERATING CONDITIONS Symbol VCC VI VI/O VO Top dt/dv Supply Voltage Input Voltage (DIR, G) Bus I/O Voltage Output Voltage Operating Temperature Input Rise and Fall Time (see note 1) (VCC = 3.3 ± 0.3V) (V CC = 5.0 ± 0.5V) Parameter Valu e 2.0 to 5.5 0 to 5.5 0 to VCC 0 to VCC -40 to +85 0 to 100 0 to 20 Unit V V V V o C ns/V ns/V 1) VIN from 30% to70%of VCC 2/8 74VHC245 DC SPECIFICATIONS Symb ol Parameter T est Cond ition s V CC (V) VIH VIL VOH High Level Input Voltage Low Level Input Voltage High Level Output Voltage 2.0 3.0 to 5.5 2.0 3.0 to 5.5 2.0 3.0 4.5 3.0 4.5 VOL Low Level Output Voltage 2.0 3.0 4.5 3.0 4.5 IOZ High Impedance Output Leakage Current Input Leakage Current Quiescent Supply Current 5.5 0 to 5.5 5.5 I O =-50 µ A IO=-50 µA IO=-50 µA IO=-4 mA IO=-8 mA I O=50 µ A IO=50 µA IO=50 µA IO=4 mA IO=8 mA VI = VIH or VIL VO = VCC or GND VI = 5.5V or GND VI = VCC or GND 1.9 2.9 4.4 2.58 3.94 0.0 0.0 0.0 0.1 0.1 0.1 0.36 0.36 ±0.25 2.0 3.0 4.5 Min. 1.5 0.7VCC 0.5 0.3VCC 1.9 2.9 4.4 2.48 3.8 0.1 0.1 0.1 0.44 0.44 ±2.5 µA V V Typ . Value T A = 25 o C Max. -40 to 85 o C Min . 1.5 0.7VCC 0.5 0.3VCC Max. V V Un it II ICC ±0.1 4 ±1.0 40 µA µA AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns) Symb ol Parameter V CC (V) tPLH tPHL Propagation Delay Time Test Co ndition CL (pF ) 15 50 15 50 15 50 15 50 50 50 50 50 RL = 1KΩ RL = 1KΩ RL = 1KΩ RL = 1KΩ RL = 1KΩ RL = 1KΩ Value T A = 25 o C Min. Typ . 5.8 8.3 4.0 5.5 8.5 11.0 5.8 7.3 11.5 7.0 Max. 8.4 11.9 5.5 7.5 13.2 16.7 8.5 10.6 15.8 9.7 1.5 1.0 Un it -40 to 85 o C Min . 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max. 10.0 13.5 6.5 8.5 15.5 19.0 10.0 12.0 18.0 11.0 1.5 1.0 ns 3.3(*) 3.3(*) 5.0(**) 5.0 3.3(*) (**) ns tPLZ tPHZ Output Disable Time tPZL tPZH tOSLH tOSHL Output Enable Time Output to Output Skew Time (note 1) 3.3(*) 5.0(**) 5.0(**) 3.3(*) 5.0(**) 3.3(*) 5.0(**) ns ns (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V Note 1: Parameter guaranteed by design. tsoLH = |tpLHm- tpLHn|, tsoHL = |tpHLm - tpHLn| 3/8 74VHC245 CAPACITIVE CHARACTERISTICS Symb ol Parameter Test Co nditions Min. C IN CI/O CPD Input Capacitance Bus Input Capacitance Power Dissipation Capacitance (note 1) T yp. 4 8 21 Valu e T A = 25 oC Max. 10 -40 to 85 o C Min. Max. 10 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. (Referto Test Circuit).Average operting current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/8(per circuit) DYNAMIC SWITCHING CHARACTERISTICS Symb ol Parameter T est Cond ition s V CC (V) VOLP VOLV VIHD VILD Dynamic Low Voltage Quiet Output (note 1, 2) Dynamic High Voltage Input (note 1, 3) Dynamic Low Voltage Input (note 1, 3) 5.0 -0.9 5.0 5.0 C L = 50 pF 3.5 1.5 Min. Typ . 0.6 -0.6 V Value T A = 25 o C Max. 0.9 -40 to 85 o C Min . Max. Un it 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 to5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz. TEST CIRCUIT T EST tPLH , tPHL tPZL , tPLZ tPZH , tPHZ CL = 15/50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 1KΩ orequivalent RT = ZOUT of pulse generator (typically 50Ω) SW IT CH Open VCC GND 4/8 74VHC245 WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 5/8 74VHC245 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 6/8 74VHC245 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 D E1 PIN 1 IDENTIFICATION 1 7/8 74VHC245 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. 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