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| 74VCX16841 Low Voltage 20-Bit Transparent Latch with 3.6V Tolerant Inputs and Outputs March 1998 Revised April 1999 74VCX16841 Low Voltage 20-Bit Transparent Latch with 3.6V Tolerant Inputs and Outputs General Description The VCX16841 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 74VCX16841 is designed for low voltage (1.65V to 3.6V) VCC applications with I/O compatibility up to 3.6V. The 74VCX16841 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining low CMOS power dissipation. Features s 1.65V-3.6V VCC supply operation s 3.6V tolerant inputs and outputs s tPD (Dn to On) 3.0 ns max for 3.0V to 3.6V VCC 3.4 ns max for 2.3V to 2.7V VCC 6.8 ns max for 1.65V to 1.95V VCC s Power-off high impedance inputs and outputs s Supports live insertion and withdrawal (Note 1) s Static Drive (IOH/IOL) 24 mA @ 3.0V VCC 18 mA @ 2.3V VCC 6 mA @ 1.65V VCC s Uses patented noise/EMI reduction circuitry s Latch-up performance exceeds 300 mA s 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 74VCX16841MTD 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) 1999 Fairchild Semiconductor Corporation DS500132.prf www.fairchildsemi.com 74VCX16841 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 74VCX16841 contains twenty D-type latches with 3STATE 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 3STATE outputs are controlled by the Output Enable (OEn) input. When OEn is LOW the standard outputs are in the 2state 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 74VCX16841 Absolute Maximum Ratings(Note 2) Supply Voltage (VCC) DC Input Voltage (VI) Output Voltage (VO) Outputs 3-STATE Outputs Active (Note 3) DC Input Diode Current (IIK) VI < 0V DC Output Diode Current (IOK) VO < 0V VO > VCC DC Output Source/Sink Current (IOH/IOL) DC VCC or GND Current per Supply Pin (ICC or GND) Storage Temperature Range (TSTG) 100 mA -65C to +150C 50 mA -50 mA +50 mA -0.5V to +4.6V -0.5V to VCC + 0.5V -50 mA -0.5V to +4.6V -0.5V to +4.6V Recommended Operating Conditions (Note 4) Power Supply Operating Data Retention Only Input Voltage Output Voltage (VO) Output in Active States Output in "OFF" State Output Current in IOH/IOL VCC = 3.0V to 3.6V VCC = 2.3V to 2.7V VCC = 1.65V to 2.3V 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 1.2V to 3.6V -0.3V to +3.6V 0V to VCC 0.0V to 3.6V 24 mA 18 mA 6 mA -40C to +85C DC Electrical Characteristics (2.7V < VCC 3.6V) Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage IOH = -100 A IOH = -12 mA IOH = -18 mA IOH = -24 mA VOL LOW Level Output Voltage IOL = 100 A IOL = 12 mA IOL = 18 mA IOL = 24 mA II IOZ IOFF ICC ICC Input Leakage Current 3-STATE Output Leakage Power-OFF Leakage Current Quiescent Supply Current Increase in ICC per Input 0 VI 3.6V 0 VO 3.6V VI = V IH or VIL 0 (VI, VO) 3.6V VI = V CC or GND VCC (VI, VO) 3.6V (Note 5) VIH = VCC -0.6V Note 5: Outputs disabled or 3-STATE only. Conditions VCC (V) 2.7 - 3.6 2.7 - 3.6 2.7 - 3.6 2.7 3.0 3.0 2.7 - 3.6 2.7 3.0 3.0 2.7 - 3.6 2.7 - 3.6 0 2.7 - 3.6 2.7 - 3.6 2.7 - 3.6 Min 2.0 Max Units V 0.8 VCC - 0.2 2.2 2.4 2.2 0.2 0.4 0.4 0.55 5.0 10 10 20 20 750 V V V V V V V V V A A A A A A 3 www.fairchildsemi.com 74VCX16841 DC Electrical Characteristics (2.3V VCC 2.7V) Symbol VIH VIL VOH Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage IOH = -100 A IOH = -6 mA IOH = -12 mA IOH = -18 mA VOL LOW Level Output Voltage IOL = 100 A IOL = 12 mA IOL = 18 mA II IOZ IOFF ICC Input Leakage Current 3-STATE Output Leakage Power-OFF Leakage Current Quiescent Supply Current 0 VI 3.6V 0 VO 3.6V VI = VIH or VIL 0 (VI, VO) 3.6V VI = VCC or GND VCC (VI, VO) 3.6V (Note 6) Note 6: Outputs disabled or 3-STATE only. Conditions V CC (V) 2.3 - 2.7 2.3 - 2.7 2.3 - 2.7 2.3 2.3 2.3 2.3 - 2.7 2.3 2.3 2.3 - 2.7 2.3 - 2.7 0 2.3 - 2.7 2.3 - 2.7 Min 1.6 Max Units V 0.7 VCC - 0.2 2.0 1.8 1.7 0.2 0.4 0.6 5.0 10 10 20 20 V V V V V V V V A A A A A DC Electrical Characteristics (1.65V VCC < 2.3V) Symbol VIH VIL VOH VOL II IOZ IOFF ICC Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Leakage Current 3-STATE Output Leakage Power-OFF Leakage Current Quiescent Supply Current IOH = -100 A IOH = -6 mA IOL = 100 A IOL = 6 mA 0 VI 3.6V 0 VO 3.6V VI = VIH or VIL 0 (VI, VO) 3.6V VI = VCC or GND VCC (VI, VO) 3.6V (Note 7) Note 7: Outputs disabled or 3-STATE only. Conditions VCC (V) 1.65 - 2.3 1.65 - 2.3 1.65 - 2.3 1.65 1.65 - 2.3 1.65 1.65 - 2.3 1.65 - 2.3 0 1.65 - 2.3 1.65 - 2.3 Min 0.65 x VCC Max Units V 0.35 x VCC VCC - 0.2 1.25 0.2 0.3 5.0 10 10 20 20 V V V V V A A A A A www.fairchildsemi.com 4 74VCX16841 AC Electrical Characteristics (Note 8) TA = -40C to +85C, CL = 30 pF, RL = 500 Symbol Parameter V CC = 3.3V 0.3V Min tPHL, tPLH tPHL, tPLH tPZL, tPZH tPLZ, tPHZ tS tH tW tOSHL tOSLH Prop Delay Dn to On Prop Delay LE to On Output Enable Time Output Disable Time Setup Time Hold Time Pulse Width Output to Output Skew (Note 9) 0.8 0.8 0.8 0.8 1.5 1.0 1.5 0.5 Max 3.0 3.5 3.8 3.7 V CC = 2.5V 0.2V Min 1.0 1.0 1.0 1.0 1.5 1.0 1.5 0.5 Max 3.4 4.4 4.9 4.2 V CC = 1.8 0.15V Min 1.5 1.5 1.5 1.5 2.5 1.0 4.0 0.75 Max 6.8 8.8 9.8 7.6 ns ns ns ns ns ns ns ns Units Note 8: For CL = 50 PF, add approximately 300 ps to the AC maximum specification. Note 9: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH). Dynamic Switching Characteristics Symbol VOLP Parameter Quiet Output Dynamic Peak VOL Conditions CL = 30 pF, VIH = VCC, VIL = 0V V CC (V) 1.8 2.5 3.3 VOLV Quiet Output Dynamic Valley VOL CL = 30 pF, VIH = VCC, VIL = 0V 1.8 2.5 3.3 VOHV Quiet Output Dynamic Valley VOH CL = 30 pF, VIH = VCC, VIL = 0V 1.8 2.5 3.3 TA = +25C Typical 0.25 0.6 0.8 -0.25 -0.6 -0.8 1.5 1.9 2.2 V V V Units Capacitance Symbol CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance Parameter Conditions VCC = 1.8V, 2.5V or 3.3V, VI = 0V or VCC VI = 0V or VCC, VCC = 1.8V, 2.5V or 3.3V VI = 0V or VCC, f = 10 MHz, VCC = 1.8V, 2.5V or 3.3V TA = +25C Typical 6 7 20 Units pF pF pF 5 www.fairchildsemi.com 74VCX16841 AC Loading and Waveforms TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ SWITCH Open 6V at VCC = 3.3 0.3V; VCC x 2 at VCC = 2.5 0.2V; 1.8V 0.15V GND FIGURE 1. AC Test Circuit 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 Symbol Vmi Vmo VX VY VCC 3.3V 0.3V 1.5V 1.5V VOL + 0.3V VOH - 0.3V 2.5V 0.2V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V 1.8V 0.15V VCC/2 VCC/2 VOL + 0.15V VOH - 0.15V www.fairchildsemi.com 6 74VCX16841 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 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 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. 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 www.fairchildsemi.com user. 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. |
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