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74LVX245
LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER (3-STATE)
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HIGH SPEED: tPD = 4.7 ns (TYP.) at VCC = 3.3V COMPATIBLE WITH TTL LEVELS IN INPUTS AND OUTPUTS LOW POWER DISSIPATION: ICC = 4 A (MAX.) at TA = 25 oC LOW NOISE: VOLP = 0.3V (TYP.) at VCC = 3.3V SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 3.6V (1.2VData Retention) PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245 IMPROVED LATCH-UP IMMUNITY
M (Micro Package)
T (TSSOP Package)
ORDER CODES : 74LVX245M 74LVX245T 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 LVX245 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. It has better speed performance at 3.3V than 5V LSTTL family combined with the true CMOS low power consumption. This IC is intended for two-way asynchronous communication between data buses; the direction PIN CONNECTION AND IEC LOGIC SYMBOLS
March 1999
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74LVX245
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 VI/O IIK IOK IO Tstg TL Supply Voltage DC Input Voltage (DIR, G) DC I/O 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 - 20 - 20 25 75 -65 to +150 300 Unit 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 Top tr, tf 2/8 Supply Voltage Input Voltage (DIR, G) I/O Voltage Operating Temperature: Input Rise and Fall Time Parameter Valu e 2 to 3.6 0 to 5.5 0 to VCC -40 to +85 0 to 10 Unit V V V
o
C
ns/V
74LVX245
DC SPECIFICATIONS
Symb ol Parameter V CC (V) VIH High Level Input Voltage 2.0 3.0 3.6 VIL Low Level Input Voltage 2.0 3.0 3.6 VOH High Level Output Voltage Low Level Output Voltage Input Leakage Current 3 State Output Leakage Current Quiescent Supply Current 2.0 3.0 3.0 VOL 2.0 3.0 3.0 II IOZ ICC 3.6 3.6 3.6 VI = V IH or V IL VI(*) = VIH or VIL
(* )
Test Co nditions Min. 1.5 2.0 2.4 T yp.
Valu e T A = 25 oC Max. -40 to 85 o C Min. 1.5 2.0 2.4 0.5 0.8 0.8 0.5 0.8 0.8 1.9 2.9 2.48 0.0 0.0 0.1 0.1 0.36 0.1 0.25 4 0.1 0.1 0.44 1 2.5 40 Max.
Un it
V
V
I O =-50 A IO=-50 A IO=-4 mA IO=50 A IO=50 A IO=4 mA
1.9 2.9 2.58
2.0 3.0
V
V A A A
VI = 5.5V or GND VI = VIH or VIL VO = VCC or GND VI = VCC or GND
(*) All outputs loaded.
DYNAMIC SWITCHING CHARACTERISTICS
Symb ol Parameter 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) 3.3 -0.8 3.3 3.3 C L = 50 pF 0.8 2 V Test Co nditions Min. T yp. Valu e T A = 25 oC Max. 0.8 -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 3.3V, (n -1) outputs switching and one output at GND 3) max number of data inputs (n) switching. (n-1) switching 0V to3.3V. Inputs under test switching: 3.3V to threshold (VILD), 0V to threshold (VIHD). f=1MHz
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74LVX245
AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns)
Symb ol Parameter V CC (V) tPLH tPHL Propagation Delay Time 2.7 2.7 3.3(*) 3.3(*) 2.7 2.7 3.3(*) 3.3(*) 2.7 3.3 2.7
(*)
T est Con ditio n CL (pF) 15 50 15 50 15 50 15 50 50 50 50 50
Valu e T A = 25 oC -40 to Min. T yp. Max. Min. 6.1 10.7 1.0 8.6 14.2 1.0 4.7 7.2 9.0 11.5 7.1 9.6 11.5 9.6 6.6 10.1 16.9 20.4 11.0 14.5 18.0 12.8 1.5 1.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Un it 85 o C Max. 13.5 17.0 8.0 11.5 20.5 24.0 13.0 16.5 21.0 14.5 1.5 1.5
ns
tPZL tPZH
Output Enable Time
R L = 1 K
ns
tPLZ tPHZ tOSLZ tOSHL
Output Disable Time Output to Output Skew Time (note 1, 2)
R L = 1 K
ns ns
3.3(*)
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 2) Parameter guaranteed by design (*) Voltage range is 3.3V 0.3V
CAPACITIVE CHARACTERISTICS
Symb ol Parameter V CC (V) C IN C i/o CPD Input Capacitance Input/Output Capacitance Power Dissipation Capacitance (note 1) 3.3 3.3 3.3 Test Co nditions Min. 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)
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74LVX245
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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74LVX245
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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74LVX245
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
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74LVX245
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