Revised November 2001 74ALVC16841 Low Voltage 20-Bit Transparent Latch with 3.6V Tolerant Inputs and Outputs General Description Features 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. ■ 1.65V–3.6V VCC supply operation The 74ALVC16841 is designed for low voltage (1.65V to 3.6V) VCC applications with I/O compatibility up to 3.6V. ■ Power-off high impedance inputs and outputs The 74ALVC16841 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining low CMOS power dissipation. ■ Uses patented noise/EMI reduction circuitry ■ 3.6V tolerant inputs and outputs ■ 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 ■ Supports live insertion and withdrawal (Note 1) ■ Latchup conforms to JEDEC JED78 ■ 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 Package Number Package Description 74ALVC16841MTD MTD56 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 © 2001 Fairchild Semiconductor Corporation Pin Descriptions DS500690 Pin Names Description OEn Output Enable Input (Active LOW) LEn Latch Enable Input D0–D19 Inputs O0–O19 Outputs www.fairchildsemi.com 74ALVC16841 Low Voltage 20-Bit Transparent Latch with 3.6V Tolerant Inputs and Outputs November 2001 74ALVC16841 Connection Diagram Truth Tables Inputs Outputs LE1 OE1 D0–D9 O0–O9 X H X Z H L L L H L H H L L X O0 Inputs Outputs LE2 OE2 D10–D19 O10–O19 X H X Z H L L L H L H H L L X 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 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. 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 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 Recommended Operating Conditions (Note 4) −0.5V to +4.6V Supply Voltage (VCC) −0.5V to 4.6V DC Input Voltage (VI) Output Voltage (VO) (Note 3) Power Supply −0.5V to VCC +0.5V Operating DC Input Diode Current (IIK) VI < 0V −50 mA 0V to VCC Output Voltage (VO) DC Output Diode Current (IOK) 0V to VCC Free Air Operating Temperature (TA) VO < 0V −50 mA −40°C to +85°C Minimum Input Edge Rate (∆t/∆V) VIN = 0.8V to 2.0V, VCC = 3.0V DC Output Source/Sink Current ±50 mA (IOH/IOL) ±100 mA Supply Pin (ICC or GND) 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. DC VCC or GND Current per Storage Temperature Range (TSTG) 1.65V to 3.6V Input Voltage (VI) −65°C to +150°C Note 3: IO Absolute Maximum Rating must be observed. Note 4: Floating or unused inputs must be held HIGH or LOW. DC Electrical Characteristics Symbol VIH VIL VOH VOL Parameter Conditions HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage IOH = −100 µA VCC (V) Min 1.65 -1.95 0.65 x VCC 2.3 - 2.7 1.7 2.7 - 3.6 2.0 Max V 1.65 -1.95 0.35 x VCC 2.3 - 2.7 0.7 2.7 - 3.6 0.8 1.65 - 3.6 VCC - 0.2 IOH = −4 mA 1.65 1.2 IOH = −6 mA 2.3 2 IOH = −12 mA 2.3 1.7 2.7 2.2 V V 3.0 2.4 IOH = −24 mA 3.0 2 IOL = 100 µA 1.65 - 3.6 0.2 IOL = 4 mA 1.65 0.45 IOL = 6 mA 2.3 0.4 IOL = 12mA 2.3 0.7 IOL = 24 mA Units 2.7 0.4 3 0.55 V II Input Leakage Current 0 ≤ VI ≤ 3.6V 3.6 ±5.0 µA IOZ 3-STATE Output Leakage 0 ≤ VO ≤ 3.6V 3.6 ±10 µA ICC Quiescent Supply Current VI = V CC or GND, IO = 0 3.6 40 µA ∆ICC Increase in ICC per Input VIH = VCC − 0.6V 3 -3.6 750 µA 3 www.fairchildsemi.com 74ALVC16841 Absolute Maximum Ratings(Note 2) 74ALVC16841 AC Electrical Characteristics T A = −40°C to +85°C, RL = 500Ω Symbol tPHL, tPLH Parameter CL = 50 pF V CC = 3.3V ± 0.3V Propagation Delay Bus to Bus tPHL, tPLH Propagation Delay LE to Bus CL = 30 pF V CC = 2.7V V CC = 2.5V ± 0.2V V CC = 1.8V ± 0.15V Units Min Max Min Max Min Max Min Max 1.3 3.5 1.5 3.9 1.0 3.4 1.5 6.8 ns 1.3 4.0 1.5 4.9 1.0 4.4 1.5 8.8 ns ns tPZL, tPZH Output Enable Time 1.3 4.3 1.5 5.4 1.0 4.9 1.5 9.8 tPLZ, tPHZ Output Disable Time 1.3 4.2 1.5 4.7 1.0 4.2 1.5 7.6 tW Pulse Width 1.5 1.5 1.5 4.0 ns tS Setup Time 1.5 1.5 1.5 2.5 ns tH Hold Time 1.0 1.0 1.0 1.0 ns ns Capacitance Symbol Parameter Conditions TA = +25°C VCC Typical Units CIN Input Capacitance VI = 0V or VCC 3.3 6 pF COUT Output Capacitance VI = 0V or VCC 3.3 7 pF CPD Power Dissipation Capacitance 3.3 20 2.5 20 www.fairchildsemi.com Outputs Enabled f = 10 MHz, CL = 50 pF 4 pF TABLE 1. Values for Figure 1 TEST SWITCH tPLH, tPHL Open tPZL, tPLZ VL tPZH, tPHZ GND FIGURE 1. AC Test Circuit TABLE 2. Variable Matrix (Input Characteristics: f = 1MHz; tr = tf = 2ns; Z0 = 50Ω) Symbol VCC 3.3V ± 0.3V 2.7V 2.5V ± 0.2V 1.8V ± 0.15V Vmi 1.5V 1.5V VCC/2 VCC/2 Vmo 1.5V 1.5V VCC/2 VCC/2 VX VOL + 0.3V VOL + 0.3V VOL + 0.15V VOL + 0.15V VY VOH − 0.3V VOH − 0.3V VOH − 0.15V VOH − 0.15V VL 6V 6V VCC*2 VCC*2 FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic FIGURE 2. Waveform for Inverting and Non-Inverting Functions 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 AC Loading and Waveforms 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: 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. 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 www.fairchildsemi.com 6