Revised June 2001 74LVQ138 Low Voltage 1-of-8 Decoder/Demultiplexer General Description Features The LVQ138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally suited for high-speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three LVQ138 devices or a 1-of-32 decoder using four LVQ138 devices and one inverter. ■ Ideal for low power/low noise 3.3V applications ■ Guaranteed simultaneous switching noise level and dynamic threshold performance ■ Improved latch-up immunity ■ Guaranteed incident wave switching into 75Ω ■ 4kV minimum ESD immunity ■ Demultiplexing capability ■ Multiple input enable for each expansion ■ Active LOW mutually exclusive outputs Ordering Code: Order Number Package Number Package Description 74LVQ138SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 74LVQ138SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code. Logic Symbols Connection Diagram IEEE/IEC Pin Descriptions © 2001 Fairchild Semiconductor Corporation DS011350 Pin Names Description A0–A2 Address Inputs E1–E2 Enable Inputs E3 Enable Input O0–O7 Outputs www.fairchildsemi.com 74LVQ138 Low Voltage 1-of-8 Decoder/Demultiplexer February 1992 74LVQ138 Functional Description Logic Diagram The LVQ138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive activeLOW outputs (O0–O7). The LVQ138 features three Enable inputs, two active-LOW (E1, E2) and one active-HIGH (E3). All outputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four LVQ138 devices and one inverter (see Figure 1). The LVQ138 can be used as an 8-output demultiplexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes. The Enable inputs which are not used must be permanently tied to their appropriate active-HIGH or activeLOW state. Truth Table Inputs Outputs E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7 H X X X X X H H H H H H H H X H X X X X H H H H H H H H X X L X X X H H H H H H H H L L H L L L L H H H H H H H L L H H L L H L H H H H H H L L H L H L H H L H H H H H L L H H H L H H H L H H H H L L H L L H H H H H L H H H L L H H L H H H H H H L H H L L H L H H H H H H H H L H L L H H H H H H H H H H H L Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial FIGURE 1. Expansion to 1-of-32 Decoding www.fairchildsemi.com 2 Supply Voltage (VCC) Recommended Operating Conditions (Note 2) −0.5V to +7.0V DC Input Diode Current (IIK) Supply Voltage (VCC) VI = −0.5V −20 mA Input Voltage (VI) VI = VCC + 0.5V +20 mA Output Voltage (VO) DC Input Voltage (VI) −0.5V to VCC + 0.5V 0V to VCC −40°C to +85°C Minimum Input Edge Rate (∆V/∆t) VO = −0.5V −20 mA VIN from 0.8V to 2.0V VO = VCC + 0.5V +20 mA VCC @ 3.0V 125 mV/ns −0.5V to VCC + 0.5V DC Output Source Note 1: 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. ±50 mA or Sink Current (IO) DC VCC or Ground Current ±200 mA (ICC or IGND) Storage Temperature (TSTG) 0V to VCC Operating Temperature (TA) DC Output Diode Current (IOK) DC Output Voltage (VO) 2.0V to 3.6V −65°C to +150°C Note 2: Unused inputs must be held HIGH or LOW. They may not float. DC Latch-Up Source or ±300 mA Sink Current DC Electrical Characteristics Symbol VIH Parameter Minimum High Level Input Voltage VIL Maximum Low Level Input Voltage VOH Minimum High Level Output Voltage VOL Maximum Low Level Output Voltage IIN Maximum Input Leakage Current TA = +25°C VCC TA = −40°C to +85°C Units (V) Typ 3.0 1.5 2.0 2.0 V 3.0 1.5 0.8 0.8 V 3.0 2.99 2.9 2.9 V 3.0 3.0 Conditions Guaranteed Limits 0.002 2.58 2.48 V 0.1 0.1 V 3.0 0.36 0.44 V 3.6 ±0.1 ±1.0 µA VOUT = 0.1V or VCC − 0.1V VOUT = 0.1V or VCC − 0.1V IOUT = −50 µA VIN = VIL or VIH (Note 3) IOH = −12 mA IOUT = 50 µA VIN = VIL or VIH (Note 3) IOL = 12 mA VI = VCC, GND IOLD Minimum Dynamic (Note 4) 3.6 36 mA VOLD = 0.8V Max (Note 5) IOH Output Current 3.6 −25 mA VOHD = 2.0V Min (Note 5) ICC Maximum Quiescent 40.0 µA Supply Current VOLP Quiet Output Maximum Dynamic VOL VOLV Quiet Output Minimum Dynamic VOL VIHD Maximum High Level Dynamic Input Voltage VILD Maximum Low Level Dynamic Input Voltage 3.6 4.0 3.3 0.8 V 3.3 −0.8 V 3.3 1.7 2.0 V 3.3 1.7 0.8 V VIN = VCC or GND (Note 6)(Note 7) (Note 6)(Note 7) (Note 6)(Note 8) (Note 6)(Note 8) Note 3: All outputs loaded; thresholds on input associated with output under test. Note 4: Maximum test duration 2.0 ms, one output loaded at a time. Note 5: Incident wave switching on transmission lines with impedances as low as 75Ω for commercial temperature range is guaranteed. Note 6: Worst case package. Note 7: Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V; one output at GND. Note 8: Max number of Data Inputs (n) switching. (n − 1) inputs switching 0V to 3.3V. Input-under-test switching: 3.3V to threshold (VILD), 0V to threshold (VIHD), f = 1 MHz. 3 www.fairchildsemi.com 74LVQ138 Absolute Maximum Ratings(Note 1) 74LVQ138 AC Electrical Characteristics TA = +25°C Symbol tPLH Parameter Propagation Delay An to On tPHL Propagation Delay An to On Propagation Delay tPLH E1 or E2 to On tPHL Propagation Delay E1 or E2 to On tPLH Propagation Delay E3 to On Propagation Delay tPHL E3 to On tOSHL, Output to Output Skew (Note 9) tOSLH Data to Output TA = −40°C to +85°C CL = 50 pF VCC CL = 50 pF (V) Min Typ Max Min Max 2.7 1.5 10.2 18.3 1.5 21.0 3.3 ± 0.3 1.5 8.5 13.0 1.5 15.0 2.7 1.5 9.6 17.6 1.5 20.0 3.3 ± 0.3 1.5 8.0 12.5 1.5 14.0 2.7 1.5 13.2 21.0 1.5 23.0 3.3 ± 0.3 1.5 11.0 15.0 1.5 16.0 2.7 1.5 11.4 19.0 1.5 21.0 3.3 ± 0.3 1.5 9.5 13.5 1.5 15.0 2.7 1.5 13.2 21.8 1.5 23.5 3.3 ± 0.3 1.5 11.0 15.5 1.5 16.5 2.7 1.5 10.2 18.3 1.5 20.0 3.3 ± 0.3 1.5 8.5 13.0 1.5 14.0 2.7 1.0 1.5 1.5 3.3 ± 0.3 1.0 1.5 1.5 Units ns ns ns ns ns ns ns 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). Parameter guaranteed by design. Capacitance Typ Units CIN Symbol Input Capacitance Parameter 4.5 pF VCC = Open CPD (Note 10) Power Dissipation Capacitance 45 pF VCC = 3.3V Note 10: CPD is measured at 10 MHz. www.fairchildsemi.com 4 Conditions 74LVQ138 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Package Number M16A 5 www.fairchildsemi.com 74LVQ138 Low Voltage 1-of-8 Decoder/Demultiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 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