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| 74F138 1-of-8 Decoder/Demultiplexer April 1988 Revised July 1999 74F138 1-of-8 Decoder/Demultiplexer General Description The F138 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 F138 devices or a 1-of-32 decoder using four F138 devices and one inverter. Features s Demultiplexing capability s Multiple input enable for easy expansion s Active LOW mutually exclusive outputs Ordering Code: Order Number 74F138SC 74F138SJ 74F138PC Package Number M16A M16D 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 Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Logic Symbols Connection Diagram IEEE/IEC (c) 1999 Fairchild Semiconductor Corporation DS009478 www.fairchildsemi.com 74F138 Unit Loading/Fan Out U.L. Pin Names A0-A2 E1, E2 E3 O0-O7 Description HIGH/LOW Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs (Active LOW) 1.0/1.0 1.0/1.0 1.0/1.0 50/33.3 Input IIH/IIL Output IOH/IOL 20 A/-0.6 mA 20 A/-0.6 mA 20 A/-0.6 mA -1 mA/20 mA Truth Table Inputs E1 H X X L L L L L L L L E2 X H X L L L L L L L L E3 X X L H H H H H H H H A0 X X X L H L H L H L H A1 X X X L L H H L L H H A2 X X X L L L L H H H H O0 H H H L H H H H H H H O1 H H H H L H H H H H H O2 H H H H H L H H H H H Outputs O3 H H H H H H L H H H H O4 H H H H H H H L H H H O5 H H H H H H H H L H H O6 H H H H H H H H H L H O7 H H H H H H H H H H L H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Functional Description The F138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active LOW outputs (O0-O7). The F138 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 F138 devices and one inverter (See Figure 1). The F138 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 active LOW state. FIGURE 1. Expansion to 1-of-32 Decoding www.fairchildsemi.com 2 74F138 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. 3 www.fairchildsemi.com 74F138 Absolute Maximum Ratings(Note 1) Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias VCC Pin Potential to Ground Pin Input Voltage (Note 2) Input Current (Note 2) Voltage Applied to Output in HIGH State (with VCC = 0V) Standard Output 3-STATE Output Current Applied to Output in LOW State (Max) ESD Last Passing Voltage (Min) twice the rated IOL (mA) 4000V -0.5V to VCC -0.5V to +5.5V -65C to +150C -55C to +125C -55C to +150C -0.5V to +7.0V -0.5V to +7.0V -30 mA to +5.0 mA Recommended Operating Conditions Free Air Ambient Temperature Supply Voltage 0C to +70C +4.5V to +5.5V Note 1: Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions is not implied. Note 2: Either voltage limit or current limit is sufficient to protect inputs. DC Electrical Characteristics Symbol VIH VIL VCD VOH VOL IIH IBVI ICEX VID IOD IIL IOS ICCH ICCL Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Current Input HIGH Current Breakdown Test Output HIGH Leakage Current Input Leakage Test Output Leakage Circuit Current Input LOW Current Output Short-Circuit Current Power Supply Current Power Supply Current -60 13 13 4.75 3.75 -0.6 -150 20 20 5.0 7.0 50 10% VCC 5% VCC 10% VCC 2.5 2.7 0.5 Min 2.0 0.8 -1.2 Typ Max Units V V V V V A A A V A mA mA mA mA Min Min Min VCC Conditions Recognized as a HIGH Signal Recognized as a LOW Signal IIN = -18 mA IOH = -1 mA IOH = -1 mA IOL = 20 mA Max Max Max 0.0 0.0 Max Max Max Max VIN = 2.7V VIN = 7.0V VOUT = VCC IID = 1.9 A All Other Pins Grounded VIOD = 150 mV All Other Pins Grounded VIN = 0.5V VOUT = 0V VO = HIGH VO = LOW AC Electrical Characteristics TA = +25C Symbol Parameter Min tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay An to On Propagation Delay E1 or E2 to On Propagation Delay E3 to On 3.5 4.0 3.5 3.0 4.0 3.5 VCC = +5.0V CL = 50 pF Typ 5.6 6.1 5.4 5.3 6.2 5.6 Max 7.5 8.0 7.0 7.0 8.0 7.5 TA = 0C to +70C VCC = +5.0V CL = 50 pF Min 3.5 4.0 3.5 3.0 4.0 3.5 Max 8.5 9.0 8.0 7.5 9.0 8.5 ns Units ns ns www.fairchildsemi.com 4 74F138 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 74F138 1-of-8 Decoder/Demultiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16E 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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