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Details, datasheet, quote on part number:74LCX244T
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Datasheet text preview:
74LCX244
LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS
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5V TOLERANT INPUTS AND OUTPUTS HIGH SPEED: tPD = 6.5 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 244 LATCH-UP PERFORMANCE EXCEEDS 500mA ESD PERFORMANCE: HBM >2000V; MM > 200V
M (Micro Package)
T (TSSOP Package)
ORDER CODES : 74LCX244M 74LCX244T
DESCRIPTION The LCX244 is a low voltage CMOS OCTAL BUS BUFFER (NON-INVERTED) 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 PIN CONNECTION AND IEC LOGIC SYMBOLS
inputs and outputs. It has same speed performance a t 3.3V than 5V AC/ACT family, combined with a lower power consumption. This device is designed to be used with 3 state memory address drivers, e tc. All inputs and outputs are equipped with protection circuits against s tatic discharge, giving them 2KV ESD immunity and transient excess voltage.
January 1997
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74LCX244
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PI N N o 1 2, 4, 6, 8 9, 7, 5, 3 11, 13, 15, 17 18, 16, 14, 12 19 10 S Y M BO L 1G NAM E AN D F UNC T I O N Ou tput Enable In put
TRUTH TABLE
I N P UT G L L H
X: "H" or "L" Z: High impedance
O UT P UT An L H X Yn L H Z
1A1 to 1A4 Data In puts 2Y1 to 2Y4 Data Ou tput s 2A1 to 2A4 Data In puts 1Y1 to 1Y4 Data Ou tput s 2G GND Ou tput Enabel In put Gr ound (0 V)
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
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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 VCC
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74LCX244
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 C T yp . 0.8 -0.8 V M a x.
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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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74LCX244
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 7.5 1.5 1.5 1.5 1.5 1.5 6.5 9.0 8.0 8.0 7.0 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 OUT C PD Input Capacita nce Out put C apacit ance 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 10 40 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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74LCX244
WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cicle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f =1MHz; 50% duty cicle)
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