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Part: 54FCT138F
Category:
Description: 1-of-8 Decoder/demultiplexer
Company: National Semiconductor Corporation
Datasheet: Download 54FCT138F datasheet File size : 180 kB
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54FCT138 1-of-8 Decoder/Demultiplexer
October 1999
54FCT138 1-of-8 Decoder/Demultiplexer
General Description
The FCT138 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 FCT138 devices or a 1-of-32 decoder using four FCT138 devices and one inverter.
Features
Demultiplexing capability Multiple input enable for easy expansion Active LOW mutually exclusive outputs Outputs sink capability of 32mA, source capability of 12mA n TTL input and output level compatible n CMOS power consumption n Standard Microcircuit Drawing (SMD) 5962-8765401 n n n n
Ordering Code
Military 54FCT138DMQB 54FCT138FMQB 54FCT138LMQB Package Number J16A W16A E20A 16-Lead Ceramic Dual-In-Line 16-Lead Cerpack 20-Lead Ceramic Leadless Chip Carrier, Type C Package Description
Logic Symbols
Connection Diagrams
Pin Assignment for DIP and Flatpak
DS100963-1
IEEE/IEC
DS100963-2
Pin Assignment for LCC
DS100963-7
Pin Names A0 A2 E1 E2 E3 O0 O7
FACT ®
Description Address Inputs Enable Inputs Enable Input Outputs
DS100963-3
is a registered trademark of Fairchild Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS100963
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54FCT138
Functional Description
The FCT138 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 FCT138 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 exInputs 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 pansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four FCT138 devices and one inverter (see Figure 1). The FCT138 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. 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
Logic Diagram
DS100963-4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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2
Logic Diagram
(Continued)
54FCT138
3
DS100963-5
FIGURE 1. Expansion to 1-of-32 Decoding
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54FCT138
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias Ceramic VCC Pin Potential to Ground Pin Input Voltage (Note 1) Input Current (Note 1) Voltage Applied to Any Output in the Disabled or Power-Off State in the HIGH State Current Applied to Output -65°C to +150°C -55°C to +125°C -55°C to +175°C -0.5V to +7.0V -0.5V to +7.0V -30 mA to +5.0 mA
in LOW State (Max) DC Latchup Source Current
Twice the rated IOL (mA) -500 mA
Recommended Operating Conditions
Free Air Ambient Temperature Military Supply Voltage Military Minimum Input Edge Rate Data Input Enable Input -55°C to +125°C +4.5V to +5.5V (V/t) 50 mV/ns 20 mV/ns
-0.5V to +5.5V -0.5V to VCC
Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. 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. National does not recommend operation of FACT ® circuits outside databook specifications.
DC Characteristics for 'FCT Family Devices
Symbol VIH VIL VCD VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Current Input LOW Current Output Short-Circuit Current Quiescent Power Supply Current Quiescent Power Supply Current Dynamic ICC 54FCT 54FCT VOL 54FCT 54FCT IIH IIL IOS ICCQ ICC ICCD 4.3 2.4 0.2 0.5 5 -5 -60 1.5 2.0 0.4 µA µA mA mA mA mA/ MHz Max Max Max Max Max Max V Min FCT138 Min 2.0 0.8 -1.2 Max V V V V Min Min Recognized HIGH Signal Recognized LOW Signal IIN = -18 mA IOH = -300 µA IOH = -12 mA IOL = 300 µA IOL = 32 mA VIN = VCC VIN = 0.0V VOUT = 0.0V VIN < 0.2V or VIN 5.3V, VCC = 5.5V VI = 3.4V, VCC = 5.5V Outputs Open, VCC = 5.5V, VIN 5.3V or VIN < 0.2V, One Bit Toggling, 50% Duty Cycle, OE = GND, LE = VCC Outputs Open, fCP = 10 MHz, VCC = 5.5V, VIN 5.3V or VIN < 0.2V, One Bit Toggling, 50% Duty Cycle, OE = GND, LE = VCC Units VCC Conditions
ICCT
Total Power Supply Current
5.5
mA
Max
Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time.
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54FCT138
AC Electrical Characteristics
VCC Symbol Parameter (V) (Note 4) Min tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay An to On Propagation Delay An to On Propagation Delay E1 or E2 to On Propagation Delay E1 or E2 to On Propagation Delay E3 to O n Propagation Delay E3 to O n
Note 4: Voltage Range 5.0 is 5.0V ± 0.5V
54FCT TA = -55°C to +125°C CL = 50 pF Max 12.0 12.0 12.5 12.5 12.5 12.5 ns ns ns ns ns ns 1.0 1.0 1.0 1.0 1.0 1.0 Units
Fig. No.
5.0 5.0 5.0 5.0 5.0 5.0
Capacitance
Symbol CIN CPD Parameter Input Capacitance Power Dissipation Capacitance Typ 4.5 60.0 Units pF pF Conditions VCC = OPEN VCC = 5.0V
5
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