Revised April 1999 74VHC138 3-to-8 Decoder/Demultiplexer General Description The VHC138 is an advanced high speed CMOS 3-to-8 decoder/demultiplexer fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. When the device is enabled, 3 binary select inputs (A0, A1 and A2) determine which one of the outputs (O0–O7) will go LOW. When enable input E3 is held LOW or either E1 or E2 is held HIGH, decoding function is inhibited and all outputs go HIGH. E3, E1 and E2 inputs are provided to ease cascade connection and for use as an address decoder for memory systems. An input protection circuit ensures that 0V to 7V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages. Features ■ High Speed: tPD = 5.7ns (typ) at TA = 25°C ■ Low power dissipation: ICC = 4 µA (max.) at TA = 25°C ■ High noise immunity: VNIH = VNIL = 28% VCC (min.) ■ Power down protection provided on all inputs ■ Pin and function compatible with 74HC138 Ordering Code: Order Number 74VHC138M 74VHC138SJ 74VHC138MTC Package Number M16A M16D MTC16 74VHC138N N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbols Connection Diagram IEEE/IEC Pin Descriptions Pin Names © 1999 Fairchild Semiconductor Corporation DS011537.prf Description A0–A2 Address Inputs E1–E2 Enable Inputs E3 Enable Input O0–O7 Outputs www.fairchildsemi.com 74VHC138 3-to-8 Decoder/Demultiplexer November 1992 74VHC138 Truth Table Inputs Outputs 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 E1 H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial www.fairchildsemi.com 2 Supply Voltage (VCC) −0.5V to +7.0V DC Input Voltage (VIN) −0.5V to +7.0V DC Output Voltage (VOUT) Recommended Operating Conditions (Note 2) 2.0V to +5.5V Supply Voltage (VCC) −0.5V to VCC + 0.5V 0V to +5.5V Input Voltage (VIN) Input Diode Current (IIK) −20 mA Output Voltage (VOUT) Output Diode Current (IOK) ±20 mA Operating Temperature (TOPR) DC Output Current (IOUT) ±25 mA Input Rise and Fall Time (tr, tf) DC VCC /GND Current (ICC ) ±75 mA VCC = 3.3V ± 0.3V 0 ∼ 100 ns/V −65°C to +150°C VCC = 5.0V ± 0.5V 0 ∼ 20 ns/V Storage Temperature (TSTG) Lead Temperature (TL) (Soldering, 10 seconds) 0V to VCC −40°C to +85°C Note 1: Absolute Maximum Ratings are values beyond which the device may be damaged or have its useful life impaired. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation outside databook specifications. 260°C Note 2: Unused inputs must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol VIH VIL VOH VOL Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage IIN Input Leakage Current ICC Quiescent Supply Current VCC (V) TA = 25°C Min Typ TA = −40°C to +85°C Max Min 2.0 1.50 1.50 3.0 − 5.5 0.7 VCC 0.7 VCC Max 2.0 0.50 0.50 0.3 VCC 0.3 VCC 2.0 1.9 2.0 1.9 2.9 3.0 2.9 4.5 4.4 4.5 4.4 3.0 2.58 2.48 4.5 3.94 3.80 Conditions V 3.0 − 5.5 3.0 Units V VIN = VIH IOH = −50 µA V or VIL IOH = −4 mA V 2.0 0.0 0.1 0.1 3.0 0.0 0.1 0.1 4.5 0.0 0.1 0.1 IOH = −8 mA VIN = VIH IOL = 50 µA V or VIL IOL = 4 mA 3.0 0.36 0.44 4.5 0.36 0.44 0 − 5.5 ±0.1 ±1.0 µA VIN = 5.5V or GND 5.5 4.0 40.0 µA VIN = VCC or GND 3 V IOL = 8 mA www.fairchildsemi.com 74VHC138 Absolute Maximum Ratings(Note 1) 74VHC138 AC Electrical Characteristics Symbol Parameter tPLH Propagation Delay tPHL An to On VCC (V) 3.3 ± 0.3 5.0 ± 0.5 tPLH Propagation Delay tPHL E3 to On 3.3 ± 0.3 5.0 ± 0.5 tPLH Propagation Delay tPHL E1 or E2 to On 3.3 ± 0.3 5.0 ± 0.5 TA = 25°C Min TA = −40°C to +85°C Typ Max Min Max 8.2 11.4 1.0 13.5 10.0 15.8 1.0 18.0 5.7 8.1 1.0 9.5 7.2 10.1 1.0 11.5 8.1 12.8 1.0 15.0 10.6 16.3 1.0 18.5 5.6 8.1 1.0 9.5 7.1 10.1 1.0 11.5 8.2 11.4 1.0 13.5 10.7 14.9 1.0 17.0 5.8 8.1 1.0 9.5 7.3 10.1 1.0 11.5 10 CIN Input Capacitance 4 CPD Power Dissipation 34 10 Units ns ns ns ns ns ns Conditions CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF pF VCC = Open pF (Note 3) Capacitance Note 3: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr.) = CPD * VCC * fIN + ICC. www.fairchildsemi.com 4 74VHC138 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Package Number M16A 16-Lead Small Outline Package (SOP) EIAJ TYPE II, 5.3mm Wide Package Number M16D 5 www.fairchildsemi.com 74VHC138 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 www.fairchildsemi.com 6 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Package Number N16E 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. 74VHC138 3-to-8 Decoder/Demultiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued)