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Part: 74LCX245T
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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 intende d for two-way asynchronous communication beetwen 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 s tatic discharge, giving them 2KV ESD immunity and transient excess voltage. IT IS PROHIBITED TO APPLY A SIGNAL TO A TERMINAL WHEN I T IS IN OUTPUT MODE AND WHEN A BUS THERMINAL IS FLOATING (HIGH IMPEDANCE STATE) IT IS REQUESTED TO F IX THE INPUT LEVEL BY BEANS 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 enviroment for both inputs and outputs. I t has same speed performance at 3.3V than 5V AC/ACT family, PIN CONNECTION AND IEC LOGIC SYMBOLS
January 1997
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LCX245
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PI N N o 1 2, 3, 4, 5, 6, 7, 8, 9 18, 17, 16, 15, 14, 13, 12, 11 19 10 20 S Y M BO L DIR A1 to A8 B1 to B8 NAM E AN D F UNC T I O N Direct ional Contro l Data In puts / Outp u ts Data In puts / Outp u ts
TRUTH TABLE
I NP U T G L L H
X: "H" or "L" Z: High impedance
F U NCT I O N DI R L H X A BU S OUTPUT IN PUT Z B BUS INPU T OUTPUT Z
O UT P UT A =B B =A Z
G GND VCC
Ou tput Enabel In put Gr ound (0 V) Po siti ve Su pply Vo lt age
ABSOLUTE MAXIMUM RATINGS
S y mb o l VCC VI VO VO II K IOK IO ICC IGND Tstg TL Supply Vo lt age DC In put Volta ge DC Ou tpu t Vo lt age ( VCC= 0V) DC Ou tpu t Vo lt age ( High or L ow S tat e) (not e1) DC In put Diode Curr ent DC Ou tpu t D iode C u rrent (n ot e2) DC Ou tpu t So u rce/ Si nk Current DC Su pply Curr ent per S upply P in DC Gr ound Current per S upply Pin Stor age T emperat ur e Lead T empe ratu re (10 se c) P arame t er V al u e -0.5 to + 7.0 -0.5 to + 7.0 -0.5 to + 7.0 -0.5 t o VCC + 0.5 - 50 ± 50 ± 50 ± 100 ± 100 -65 to +150 300 Un i t V V V V mA mA mA mA mA
o o
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 VCC
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LCX245
RECOMMENDED OPERATING CONDITIONS
Sy m b o l VCC VI VO VO IOH, IOL IOH, IOL Top dt/dv In put V oltage Ou tp ut Vo lt age (VCC=0 V) Ou tp ut Vo lt age (High o r L ow S t at e) High or L ow Level O utput C ur rent (V CC = 3. 0 t o 3.6V ) High or L ow Level O utput C ur rent (V CC = 2. 7 t o 3.0V ) Op er ating T emperat ur e: In put T ra nsit ion R ise o r Fall R a te ( VCC = 3.0 V) ( note 2) P ara met er Su pply Volt age (note 1 ) V al u e 2.0 to 3.6 0 to 5.5 0 to 5.5 0 to VCC ± 24 ± 12 -40 to +85 0 to 10 Un i t V V V V mA mA
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C
ns/V
1) Truth Table guaranteed: 1.5V to 3.6V 2) VIN from 0.8V to 2.0V
DC SPECIFICATIONS
S ym b o l P a ra m e t er V CC (V ) VIH VIL VOH High Level I nput V o ltage Low L evel Input Volta ge High Level O ut put Volta ge 2. 7 t o 3. 6 2.7 to 3.6 2.7 3.0 VOL Low L evel Outp ut Volt age 2.7 to 3.6 2.7 3.0 3.0 II IOZ Ioff ICC Input Leakage C urrent 3 St a te O utp ut L e akage C ur rent Power O f f Leak age C u rrent Quies cent Supply C u rrent 2. 7 t o 3. 6 2.7 to 3.6 0 2.7 to 3.6 VI = V I H or VIL T est C o n d i t i o n s V al u e - 40 t o 85 C Mi n. 2.0 0.8 IO=-100 µA V CC - 0. 2 IO=-12 mA IO=-18 mA IO=-24 mA VI = V I H or VIL IO=100 µA 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 inc r. 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 µA µA µA µA µA V V M ax. V V
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Unit
DYNAMIC SWITCHING CHARACTERISTICS
S ym b o l P arame t er V CC (V) VOLP VOLV Dynam ic Low V oltag e Quiet O utput (not e 1 ) 3.3 C L = 50 pF V IL = 0 V V I H = 3 . 3V T est Co n d i t i o n s M in. V al u e T A = 25 o C T yp . 0.8 -0.8 V M a x. Unit
1) Number of outputs defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to 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 = t f = 2.5 ns)
S ym b o l P ar am e t er V CC ( V) tPLH tPHL tPZL tPZH tPLZ tPHZ tOSLZ tOSHL Propagati on D e lay T ime Out put En able Ti m e Out put D isable T im e Out put to Ou tp ut Sk ew T im e (not e 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 T est Co n d i t i o n W av ef o rm V al u e - 40 t o 85 C M i n . M ax. 1.5 8.0 1.5 1.5 1.5 1.5 1.5 7.0 9.5 8.5 8.5 7.5 1.0
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Unit
1 2 2
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
CAPACITIVE CHARACTERISTICS
S ym b o l P arame t er V CC (V ) CIN C i/o C PD Input Capacita nce I/O C apaci tanc e Power D is sipat ion Capac ita nce (note 1) 3.3 3.3 3.3 VIN = 0 to VCC VIN = 0 to VCC fIN = 10MHz VIN = 0 or VCC T est C o n d i t i o n s Min . Va l u e TA = 25 C Typ. 6 12 45 M ax. pF pF pF
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Unit
1) CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the 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 E ST t PLH, tPHL t PZL, tPL Z t PZH, tPHZ
CL = 50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 500 or equivalent RT = ZOUT of pulse generator (typically 50)
SW I T C H 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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