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| 74LCX16244 Low voltage CMOS 16-bit bus buffer (3-state) with 5V tolerant inputs and outputs Features 5V tolerant inputs and outputs High speed: - tPD = 4.5ns (Max) at VCC = 3V Power down protection on inputs and outputs Symmetrical output impedance: - |IOH| = IOL = 24mA (Min) at VCC = 3V PCI bus levels guaranteed at 24mA Balanced propagation delays: - tPLH tPHL Operating voltage range: - VCC (Opr) = 2.0V to 3.6V Pin and function compatible with 74 series 16244 Latch-up performance exceeds 500mA (JESD 17) ESD performance: - HBM > 2000V (MIL STD 883 method 3015); MM > 200V TSSOP48 Description The 74LCX16244 is a low voltage CMOS 16 bit bus buffer (non-inverted) fabricated with submicron 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 environment for both inputs and outputs. Any nG output control governs four BUS BUFFERS. Output Enable input (nG) tied together gives full 16-bit operation. When nG is LOW, the outputs are on. When nG is HIGH, the output are in high impedance state. This device is designed to be used with 3 state memory address drivers, etc. It has same speed performance at 3.3V than 5V AC/ACT family, combined with a lower power consumption. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. Order codes Part number 74LCX16244TTR Package TSSOP48 Packaging Tape and reel February 2007 Rev 6 1/15 www.st.com 15 Contents 74LCX16244 Contents 1 2 Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 2.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Logic states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 6 7 8 9 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 74LCX16244 Logic symbols and I/O equivalent circuit 1 Logic symbols and I/O equivalent circuit Figure 1. IEC logic symbols Figure 2. Input and output equivalent circuit 3/15 Pin settings 74LCX16244 2 2.1 Pin settings Pin connection Figure 3. Pin connection (top through view) 4/15 74LCX16244 Logic states 2.2 Pin description Table 1. Pin description Pin N 1 2, 3, 5, 6 8, 9, 11, 12 13, 14, 16, 17 19, 20, 22, 23 24 25 30, 29, 27, 26 36, 35, 33, 32 41, 40, 38, 37 47, 46, 44, 43 48 4, 10, 15, 21, 28, 34, 39, 45 7, 18, 31, 42 Symbol 1G 1Y1 to 1Y4 2Y1 to 2Y4 3Y1 to 3Y4 4Y1 to 4Y4 4G 3G 4A1 to 4A4 3A1 to 3A4 2A1 to 2A4 1A1 to 1A4 2G GND VCC Name and function Output enable input Data outputs Data outputs Data outputs Data outputs Output enable input Output enable input Data outputs Data outputs Data outputs Data outputs Output enable input Ground (0V) Positive supply voltage 3 3.1 Logic states Truth table Table 2. Truth table Inputs G L L H An L H X Output Yn L H Z Note: X : Do not care Z : High impedance 5/15 Maximum rating 74LCX16244 4 Maximum rating Stressing the device above the rating listed in the "absolute maximum ratings" table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. refer also to the STMicroelectronics sure program and other relevant quality documents. Table 3. Absolute maximum ratings Symbol VCC VI VO VO IIK IOK IO ICC IGND Tstg TL Supply voltage DC input voltage DC output voltage (OFF state) DC output voltage (high or low state) (1) DC input diode current DC output diode current (2) DC output current DC supply current per supply pin DC ground current per supply pin Storage temperature Lead temperature (10 sec) Parameter Value -0.5 to +7.0 -0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 -50 -50 50 100 100 -65 to +150 300 Unit V V V V mA mA mA mA mA C C 1. IO absolute maximum rating must be observed 2. VO < GND 4.1 Recommended operating conditions Table 4. Recommended operating conditions Symsbol VCC VI VO VO IOH, IOL IOH, IOL Top dt/dv Supply voltage (1) Input voltage Output voltage (OFF state) Output voltage (high or low state) High or low level output current (VCC = 3.0 to 3.6V) High or low level output current (VCC = 2.7V) Operating temperature Input rise and fall time (2) Parameter Value 2.0 to 3.6 0 to 5.5 0 to 5.5 0 to VCC 24 12 -40 to 85 0 to 10 Unit V V V V mA mA C ns/V 1. Truth table guaranteed: 1.5V to 3.6V 2. VIN from 0.8V to 2V at VCC = 3.0V 6/15 74LCX16244 Electrical characteristics 5 Electrical characteristics Table 5. DC specifications Test condition Symbol Parameter VCC (V) 2.7 to 3.6 Low level input voltage 2.7 to 3.6 2.7 VOH High level output voltage 3.0 2.7 to 3.6 2.7 VOL Low level output voltage 3.0 II Ioff IOZ Input leakage current Power OFF leakage current High impedance output leakage current Quiescent supply current I incr. per Input 2.7 to 3.6 0 2.7 to 3.6 IO = -100A IO = -12mA IO = -18mA IO = -24mA IO = 100A IO = 12mA IO = 16mA IO = 24mA VI = 0 to 5.5V VI or VO = 5.5V VI = VIH or VIL VO = 0 to VCC VI = VCC or GND VI or VO = 3.6 to 5.5V 2.7 to 3.6 VIH = VCC - 0.6V VCC-0.2 2.2 V 2.4 2.2 0.2 0.4 V 0.4 0.55 5 10 5 20 20 500 A A A 0.8 V Value -40 to 85C Min 2.0 Max V Unit VIH VIL High level input voltage ICC ICC 2.7 to 3.6 A A Table 6. Dynamic switching characteristics Test condition Symbol Parameter VCC (V) 3.3 CL = 50pF VIL = 0V, VIH = 3.3V Value TA = 25 C Min Typ 0.8 V -0.8 Max Unit VOLP VOLV Dynamic low level quiet output (1) 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. 7/15 Electrical characteristics Table 7. AC electrical characteristics Test condition Symbol Parameter VCC (V) 2.7 50 3.0 to 3.6 2.7 50 3.0 to 3.6 2.7 50 3.0 to 3.6 3.0 to 3.6 50 500 2.5 500 2.5 1.5 500 2.5 1.5 1.5 500 2.5 1.5 1.5 CL (pF) RL () ts = tr (ns) 74LCX16244 Value -40 to 85 C Min 1.5 Max 5.2 ns 4.5 6.3 ns 5.5 5.7 ns 5.4 1.0 ns Unit tPLH tPHL Propagation delay time Output enable time Output disable time Output to output skew time (1) (2) tPZL tPZH tPLZ tPHZ tOSLH tOSHL 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 Table 8. Capacitive characteristics Test condition Symbol Parameter VCC (V) 3.3 3.3 3.3 VIN = 0 to VCC VIN = 0 to VCC fIN = 10MHz VIN = 0 or VCC Value TA = 25 C Min Typ 7 8 20 Max pF pF pF Unit CIN COUT CPD Input capacitance Output capacitance Power dissipation capacitance (1) 1. CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/16 (per circuit) 8/15 74LCX16244 Test circuit 6 Test circuit Figure 4. Test circuit Figure 5. Test circuit Test tPLH, tPHL tPZL, tPLZ tPZH, tPHZ Switch Open 6V GND CL = 50pF or equivalent (includes jig and probe capacitance) RL = R1 = 500 or equivalent RT = ZOUT of pulse generator (typically 50) 9/15 Waveforms 74LCX16244 7 Waveforms Figure 6. Propagation delays (f = 1MHz; 50% duty cycle) Figure 7. Output enable and disable time (f = 1MHz; 50% duty cycle) 10/15 74LCX16244 Package mechanical data 8 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 11/15 Package mechanical data 74LCX16244 TSSOP48 MECHANICAL DATA mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 6.0 0.5 BSC 8 0.75 0 0.018 0.17 0.09 12.4 8.1 BSC 6.2 0.236 0.0197 BSC 8 0.030 0.05 0.9 0.27 0.20 12.6 0.0067 0.0035 0.488 0.318 BSC 0.244 TYP MAX. 1.2 0.15 0.002 0.035 0.011 0.0079 0.496 MIN. TYP. MAX. 0.047 0.006 inch A A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 7065588D 12/15 74LCX16244 Package mechanical data Tape & Reel TSSOP48 MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 8.7 13.1 1.5 3.9 11.9 12.8 20.2 60 30.4 8.9 13.3 1.7 4.1 12.1 0.343 0.516 0.059 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 1.197 0.350 0.524 0.067 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch 13/15 Revision history 74LCX16244 9 Revision history Table 9. Revision history Date 15-Sep-2004 06-Feb-2007 Revision 5 6 Changes Ordering Codes Revision - pag. 1. Document reformatted, temperature ranges updated 14/15 74LCX16244 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. 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