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| 74ALVC16841 Low Voltage 20-Bit Transparent Latch with 3.6V Tolerant Inputs and Outputs November 2001 Revised November 2001 74ALVC16841 Low Voltage 20-Bit Transparent Latch with 3.6V Tolerant Inputs and Outputs General Description The ALVC16841 contains twenty non-inverting latches with 3-STATE outputs and is intended for bus oriented applications. The device is byte controlled. The flip-flops appear transparent to the data when the Latch enable (LE) is HIGH. When LE is LOW, the data that meets the setup time is latched. Data appears on the bus when the Output Enable (OE) is LOW. When OE is HIGH, the outputs are in a high impedance state. The 74ALVC16841 is designed for low voltage (1.65V to 3.6V) VCC applications with I/O compatibility up to 3.6V. The 74ALVC16841 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining low CMOS power dissipation. Features I 1.65V-3.6V VCC supply operation I 3.6V tolerant inputs and outputs I tPD (Dn to On) 3.5 ns max for 3.0V to 3.6V VCC 3.9 ns max for 2.3V to 2.7V VCC 6.8 ns max for 1.65V to 1.95V VCC I Power-off high impedance inputs and outputs I Supports live insertion and withdrawal (Note 1) I Uses patented noise/EMI reduction circuitry I Latchup conforms to JEDEC JED78 I ESD performance: Human body model > 2000V Machine model > 200V Note 1: To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pull-up resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver. Ordering Code: Order Number 74ALVC16841MTD Package Number MTD56 Package Description 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code. Logic Symbol Pin Descriptions Pin Names OEn LEn D0-D19 O0-O19 Description Output Enable Input (Active LOW) Latch Enable Input Inputs Outputs (c) 2001 Fairchild Semiconductor Corporation DS500690 www.fairchildsemi.com 74ALVC16841 Connection Diagram Truth Tables Inputs LE1 X H H L OE1 H L L L Inputs LE2 X H H L OE2 H L L L D10-D19 X L H X D0-D9 X L H X Outputs O0-O9 Z L H O0 Outputs O10-O19 Z L H O0 H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial (HIGH or LOW, inputs may not float) Z = High Impedance O0 = Previous O0 before HIGH-to-LOW of Latch Enable Functional Description The 74ALVC16841 contains twenty D-type latches with 3-STATE outputs. The device is byte controlled with each byte functioning identically, but independent of the other. Control pins can be shorted together to obtain full 20-bit operation. The following description applies to each byte. When the Latch Enable (LEn) input is HIGH, data on the Dn enters the latches. In this condition the latches are transparent, i.e., a latch output will change states each time its D-type input changes. When LEn is LOW, the latches store information that was present on the D-type inputs a setup time preceding the HIGH-to-LOW transition on LEn. The 3-STATE outputs are controlled by the Output Enable (OEn) input. When OEn is LOW the standard outputs are in the 2-state mode. When OEn is HIGH, the standard outputs are in the high impedance mode but this does not interfere with entering new data into the latches. Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 74ALVC16841 Absolute Maximum Ratings(Note 2) Supply Voltage (VCC) DC Input Voltage (VI) Output Voltage (VO) (Note 3) DC Input Diode Current (IIK) VI < 0V DC Output Diode Current (IOK) VO < 0V DC Output Source/Sink Current (IOH/IOL) DC VCC or GND Current per Supply Pin (ICC or GND) Storage Temperature Range (TSTG) -0.5V to +4.6V -0.5V to 4.6V -0.5V to VCC +0.5V -50 mA -50 mA 50 mA 100 mA -65C to +150C Recommended Operating Conditions (Note 4) Power Supply Operating Input Voltage (VI) Output Voltage (VO) Free Air Operating Temperature (TA) Minimum Input Edge Rate (t/V) VIN = 0.8V to 2.0V, VCC = 3.0V 10 ns/V Note 2: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Note 3: IO Absolute Maximum Rating must be observed. Note 4: Floating or unused inputs must be held HIGH or LOW. 1.65V to 3.6V 0V to VCC 0V to VCC -40C to +85C DC Electrical Characteristics Symbol VIH Parameter HIGH Level Input Voltage Conditions VCC (V) 1.65 -1.95 2.3 - 2.7 2.7 - 3.6 VIL LOW Level Input Voltage 1.65 -1.95 2.3 - 2.7 2.7 - 3.6 VOH HIGH Level Output Voltage IOH = -100 A IOH = -4 mA IOH = -6 mA IOH = -12 mA 1.65 - 3.6 1.65 2.3 2.3 2.7 3.0 IOH = -24 mA VOL LOW Level Output Voltage IOL = 100 A IOL = 4 mA IOL = 6 mA IOL = 12mA IOL = 24 mA II IOZ ICC ICC Input Leakage Current 3-STATE Output Leakage Quiescent Supply Current Increase in ICC per Input 0 VI 3.6V 0 VO 3.6V VI = V CC or GND, IO = 0 VIH = VCC - 0.6V 3.0 1.65 - 3.6 1.65 2.3 2.3 2.7 3 3.6 3.6 3.6 3 -3.6 VCC - 0.2 1.2 2 1.7 2.2 2.4 2 0.2 0.45 0.4 0.7 0.4 0.55 5.0 10 40 750 A A A A V V Min 0.65 x VCC 1.7 2.0 0.35 x VCC 0.7 0.8 V V Max Units 3 www.fairchildsemi.com 74ALVC16841 AC Electrical Characteristics T A = -40C to +85C, RL = 500 Symbol Parameter CL = 50 pF V CC = 3.3V 0.3V Min tPHL, tPLH tPHL, tPLH tPZL, tPZH tPLZ, tPHZ tW tS tH Propagation Delay Bus to Bus Propagation Delay LE to Bus Output Enable Time Output Disable Time Pulse Width Setup Time Hold Time 1.3 1.3 1.3 1.3 1.5 1.5 1.0 Max 3.5 4.0 4.3 4.2 V CC = 2.7V Min 1.5 1.5 1.5 1.5 1.5 1.5 1.0 Max 3.9 4.9 5.4 4.7 CL = 30 pF V CC = 2.5V 0.2V Min 1.0 1.0 1.0 1.0 1.5 1.5 1.0 Max 3.4 4.4 4.9 4.2 V CC = 1.8V 0.15V Min 1.5 1.5 1.5 1.5 4.0 2.5 1.0 Max 6.8 8.8 9.8 7.6 ns ns ns ns ns ns ns Units Capacitance Symbol CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance Parameter VI = 0V or VCC VI = 0V or VCC Outputs Enabled f = 10 MHz, CL = 50 pF Conditions TA = +25C VCC 3.3 3.3 3.3 2.5 Typical 6 7 20 20 Units pF pF pF www.fairchildsemi.com 4 74ALVC16841 AC Loading and Waveforms TABLE 1. Values for Figure 1 TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ SWITCH Open VL GND FIGURE 1. AC Test Circuit TABLE 2. Variable Matrix (Input Characteristics: f = 1MHz; tr = tf = 2ns; Z0 = 50) Symbol Vmi Vmo VX VY VL VCC 3.3V 0.3V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 6V 2.7V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 6V 2.5V 0.2V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V VCC*2 1.8V 0.15V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V VCC*2 FIGURE 2. Waveform for Inverting and Non-Inverting Functions FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic FIGURE 5. Propagation Delay, Pulse Width and trec Waveforms FIGURE 6. Setup Time, Hold Time and Recovery Time for Low Voltage Logic 5 www.fairchildsemi.com 74ALVC16841 Low Voltage 20-Bit Transparent Latch with 3.6V Tolerant Inputs and Outputs Physical Dimensions inches (millimeters) unless otherwise noted 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide Package Number MTD56 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 6 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com |
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