TC 7ALCX244F/FW/FS LOW VOLTAGE OCTAL BUS BUFFER WITH 5V TOLERANT INPUTS AND OUTPUTS The TC74LCX244 is a high parformance CMOS OCTAL BUS TC74LCX244F BUFFER. Designed for use in 3.3 Volt systems, it achieves high speed operation while maintaining the CMOS low power dissipation. The device is designed for low-voltage (3.3V) Vcc applications, but it could be used to interface to 5V supply environment for both inputs and outputs. The 74LCX244 is a non-inverting 3-state buffer having two active-low output enables. This device is designed to be used with 3-state memory address drivers, etc. $OP20-P-300 TC74LCX244FW All inputs are equipped with protection circuits against static discharge. FEATURES Low voltage operation : Vcc=2.0~3.6V @ High speed operation <: tpg = 6.5ns (Max.) 50120-P-300 (Vcc =3.0~3.6V) TC74LCX244FS @ Output current > floH|/loLt=24mA (Min, (Vcc =3.0V) Latch-up performance : +500mA @ Available in JEDEC SOP, EIA) SOP and SSOP @ Power down protection is provided on all inputs and SSOP20-P-225A4 outputs. ; ; Weight SOP20-P-300 =: 0.22g (Typ.) Pin and function compatible with the 74 series SOL20-P-300 =: 0.46g (Typ.) (74AC/VHC/HC/F/ALS/LS etc.) 244 type. SSOP20-P-225A : 0.09g (Typ.) 154TC74L0X244F/FW/FS PIN ASSIGNMENT IEC LOGIC SYMBOL _ = 1 10E 1 20 Veco 20 tal 2 19 20 tat 2 18 1 a 16 zva 3 Biya a2 wT? 103 ; 3 13 1Al A nN 17 24 1Aa 1A4a 2735 16 12 20E 9 1A3 6 15 203 "1 9 2Al 3 7 21 2Y2 7 14 t3 2Al 2v2 15 5 243 23 1A4 8 13 2A2 Aa v7 3 aya 21 9 12 14 GNO 10 11 2At (TOP VIEW) TRUTH TABLE INPUTS An OUTPUTS L L L L H H x H Zz X : Dont Care Z : High Impedance MAXIMUM RATINGS PARAMETER SYMBOL RATING UNIT Supply Voltage Range Vec -0.5~7.0 Vv DC Input Voltage VIN -0.5~7.0 Vv DC Output Voltage VOUT ~0.5~7.0 (Note 1) Vv -0.5~Vcc+0.5 (Note 2) Input Diode Current IK - 50 mA Output Diode Current lOoK +50 (Note 3)}] mA DC Output Current lout +50 mA Power Dissipation Pp 180 mw DC Vcc/Ground Current Icc /IGND +100 mA Storage Temperature Tstg -65~150 C (Note 1) Off-State (Note 2) High or Low State. IqyT absolute maximum rating must be observed. (Note 3) VouT<GND, VoutT>Vec 155TC74L0X244F/FW/FS RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL RATING UNIT Supply Voltage Vec 2.0~3.6 Vv 1.5~3.6 (Note 4) Input Voltage VIN O~5.5 Vv Output Voltage VOUT 05.5 (Note 5) Vv O~ Vcc (Note 6) Output Current lon! #24 (Note 7) | i uNpur Curren OH TOL +12 (Note 8) m Operating Temperature Topr -40~85 C Input Rise And Fall Time dt/dv O~10 (Note 9) | ns/V (Note 4) Data Retention Only (Note 5) Off-State (Note 6) High or Low State (Note 7) Vcc =3.0~3.6V (Note 8) Vcc =2.7~3.0V (Note 9) Vin =0.8~2.0V, Vcc = 3.0V ELECTRICAL CHARACTERISTICS DC characteristics (Ta = -40~85C) PARAMETER SYMBOL TEST CONDITION MIN. | MAX. | UNIT Vec {V) Input "H" Level VIH 2.7~3.6}] 2.0 y Voltage "L" Level VIL 2.7~3.6) 0.8 lon= -100a }2.7~3.6| YOO | -0.2 H Level VOH VIN=VIH oF VIL loH = 12mA 2.7 2.2 _ I =-18mA 3.0 2.4 _ Output oe Cy 7 Voltage OH = 24mA 30 2. V loL = 100A 2.7~3.6) 0.2 L" Level VoL VIN =Vin or Vit loL = 12mA 27 0.4 lol = 16mA 3.0 0.4 lot =24mA 3.0 _ 0.55 Input Leakage Current LN VIN = 0~5.5V 2.7~3.6) 45.0) uA 3-State Output VIN=VIH or Vi I 2.7~3.6) +5.0 A Off-State Current oz Vout =0~5.5V # Power Off Leakage i VIN/V =5.5V 0 _ 10.0 A Cuurent OFF IN? YOUT # Quiescent Supply Vin=Vcc or GND 2.7~3.6) 10.0 A Current cc VIN/ Vout = 3.0~5.5V 2.7~3.6| |+10.0| reas in Icc Per alec |Vin=Vcc-0.6V 27~3.6{ | 500] pA pu 156 TC74L0X244F/FW/FS AC characteristic (Ta = -40~85C) PARAMETER SYMBOL TEST CONDITION Veo ty) MIN: MAX. | UNIT Propagation Delay toLH (Fig.1, 2) 27 _ 7.5 ns Time tpHL 3.3+0.3/ 15 | 6.5 t 2.7 . Output Enable Time pal (Fig.1, 3) 9.0 ns tozH 3.3403] 15 | 8.0 . tpLz 2.7 8.0 Output Disable T P Fig.1, 3 pur ime toHz (Fig.1, 3) 33t03/ 15 | 70] Output To Output tosLH 27 Not Skew tosHL (Note 10) s3e03) | 101 (Note 10) Parameter guaranteed by design. (tosLH =ltpLHm tpLHnl tosHE =[tpHLm tpHtnl) DYNAMIC SWITCHING CHARACTERISTICS (Ta = 25C, Input tp=tf=2.5ns, Cy =50pF, RL = 5000) PARAMETER SYMBOL TEST CONDITION TYP. | UNIT Vec (V) jet Output Maxi D i Quie utpu aximum Dynamic VoLp Vin =3.3V, VL =0V 33 0.8 Vv VOL - t Mini D - Quiet Output Minimum ot VoLvI Vip =3.3V, Vip = OV 33 08 Vv CAPACITIVE CHARACTERISTICS (Ta = 25C) PARAMETER SYMBOL TEST CONDITION TYP. | UNIT Vee {V) Input Capacitance CIN 3.3 7 pF Output Capacitance CoutT ~ 3.3 8 pF Power Dissipation C fig = 10MH N 1 . F Capacitance PD IN z (Note 11) | 3.3 25 | p (Note 11) Cpp is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption. Average operating current can be obtained by the equation : Icc(opr.) =Cpp Voc fint!cc/8 (per bit) 157TC74L0X244F/FW/FS TEST CIRCUIT Fig.1 Open SWITCH (7% oO 6.0V PARAMETER SWITCH oO GND RL 1 toH Open OUTPUT MEASURE f 6.0V ' GND cL RL Cy = S0pF | R, = 5000 AC WAVEFORM Fig.2 toLH. tpHL tp. 25ns te 2 Sns _ 90% | 27v INPUT y 15V (a) j N 10% GND Vou OUTPUT 1.5V (Y) F VoL SoLH tpHL Fig.3 toiz, tpHz. tozL. tpZH tr. 25ns t 2.5ns 27V f 30% 4 Y 15V \ QUTPUT ENABLE J Oe (OE) toLz tpzt 3.0 OUTPUT (Y} \ Low to Off to Low sv OL + 0.30 LL VoL tpzH toHz - * Vio - 0 3V Vou OUTPUT {Y) OH High to Off to High 1.5V fo OUTPUTS OUTPUTS OUTPUTS ENABLED DISABLED ENABLED 158