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Part: 74AC138PC
Category:
Description: 1-of-8 Decoder/demultiplexer
Company: Fairchild Semiconductor
Datasheet: Download 74AC138PC datasheet File size : 232 kB
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74AC138 · 74ACT138 1-of-8 Decoder/Demultiplexer
November 1988 Revised August 2000
74AC138 · 74ACT138 1-of-8 Decoder/Demultiplexer
General Description
The AC/ACT138 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 AC/ACT138 devices or a 1-of-32 decoder using four AC/ACT138 devices and one inverter.
Features
s ICC reduced by 50% s Demultiplexing capability s Multiple input enable for easy expansion s Active LOW mutually exclusive outputs s Outputs source/sink 24 mA s ACT138 has TTL-compatible inputs
Ordering Code:
Order Number 74AC138SC 74AC138SJ 74AC138MTC 74AC138PC 74ACT138SC 74ACT138SJ 74ACT138PC Package Number M16A M16D MTC16 N16E 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 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 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
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Connection Diagram
Logic Symbols
IEEE/IEC
Pin Descriptions
Pin Names A0A2 E1E2 E3 O0O7 Description Address Inputs Enable Inputs Enable Input Outputs
FACT is a trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation
DS009925
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74AC138 · 74ACT138
Truth Table
Inputs E1 H X X L L L L L L L L
H = HIGH Voltage Level
Outputs 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 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
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
L = LOW Voltage Level
X = Immaterial
Functional Description
The AC/ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive activeLOW outputs (O0O7). The AC/ACT138 features three Enable inputs, two active-LOW (E1, E2) and one activeHIGH (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 AC/ACT138 devices and one inverter (see Figure 1). The AC/ACT138 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.
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.
FIGURE 1. Expansion to 1-of-32 Decoding
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74AC138 · 74ACT138
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Input Diode Current (IIK) VI = -0.5V VI = VCC + 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = -0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND) Storage Temperature (TSTG) Junction Temperature (TJ) PDIP 140°C
-0.5V to +7.0V -20 mA +20 mA -0.5V to VCC + 0.5V -20 mA +20 mA -0.5V to VCC + 0.5V ±50 mA ±50 mA -65°C to +150°C
Recommended Operating Conditions
Supply Voltage (VCC) AC ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) Minimum Input Edge Rate (V/t) AC Devices VIN from 30% to 70% of VCC VCC @ 3.3V, 4.5V, 5.5V Minimum Input Edge Rate (V/t) ACT Devices VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V 125 mV/ns
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. Fairchild does not recommend operation of FACT circuits outside databook specifications.
2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC
-40°C to +85°C
125 mV/ns
DC Electrical Characteristics for AC
Symbol VIH Parameter Minimum HIGH Level Input Voltage VIL Maximum LOW Level Input Voltage VOH Minimum HIGH Level Output Voltage VCC (V) 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 VOL Maximum LOW Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 IIN (Note 4) IOLD IOHD ICC (Note 4) Maximum Input Leakage Current Minimum Dynamic Output Current (Note 3) Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 4 .0 0 .002 0 .001 0 .001 TA = +25°C Typ 1 .5 2 .25 2 .75 1 .5 2 .25 2 .75 2 .99 4 .49 5 .49 2.1 3.15 3.85 0.9 1.35 1.65 2 .9 4 .4 5 .4 2.56 3.86 4.86 0.1 0.1 0.1 0.36 0.36 0.36 ±0.1 TA = -40°C to +85°C Guaranteed Limits 2 .1 3.15 3.85 0 .9 1.35 1.65 2.9 4.4 5.4 VIN = VIL or VIH 2.46 3.76 4.76 0 .1 0 .1 0 .1 VIN = VIL or VIH 0.44 0.44 0.44 ±1.0 75 -75 40.0 µA mA mA µA V IOL = 24 mA IOL = 24 mA 0 IOL = 24 mA (Note 2) VI = VCC, GND VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or GND V IOUT = 50 µA V IOH = -12 mA IOH = -24 mA IOH = -24 mA (Note 2) V IOUT = -50 µA V VOUT = 0.1V or VCC - 0.1V V Units Conditions VOUT = 0.1V or VCC - 0.1V
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. Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.
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74AC138 · 74ACT138
DC Electrical Characteristics for ACT
Symbol VIH VIL VOH Parameter Minimum HIGH Level Input Voltage Maximum LOW Level Input Voltage Minimum HIGH Level Output Voltage V CC (V) 4.5 5.5 4 .5 5.5 4.5 5 .5 4.5 5.5 VOL Maximum LOW Level Output Voltage 4.5 5 .5 4.5 5.5 IIN ICCT IOLD IOHD ICC Maximum Input Leakage Current Maximum ICC/Input Minimum Dynamic Output Current (Note 6) Maximum Quiescent Supply Current 5.5 5.5 5.5 5.5 5.5 4 .0 0 .6 0.001 0.001 TA = +25°C Typ 1 .5 1.5 1.5 1.5 4.49 5.49 2.0 2.0 0 .8 0.8 4 .4 5.4 3 .86 4 .86 0.1 0 .1 0 .36 0 .36 ± 0.1 TA = -40°C to +85°C Guaranteed Limits 2 .0 2.0 0.8 0.8 4.4 5 .4 3 .76 4 .76 0 .1 0.1 0 .44 0 .44 ± 1.0 1.5 75 - 75 40.0 µA mA mA mA µA V Units V V V Conditions VOUT = 0.1V or VCC - 0.1V VOUT = 0.1V or VCC - 0.1V IOUT = -50 µA VIN = VIL or VIH V IOH = -24 mA IOH = -24 mA (Note 5) IOUT = 50 µA VIN = VIL or VIH V IOL 24 mA IOL.= 24 mA (Note 5) VI = VCC, GND VI = VCC - 2.1V VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC or GND
Note 5: All outputs loaded; thresholds on input associated with output under test. Note 6: Maximum test duration 2.0 ms, one output loaded at a time.
AC Electrical Characteristics for AC
VCC Symbol Parameter (V) (Note 7) 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 On Propagation Delay E3 to On
Note 7: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V
TA = +25°C CL = 50 pF Min 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Typ 8.5 6.5 8.0 6.0 11.0 8.0 9.5 7.0 11.0 8.0 8.5 6 .0 Max 13.0 9 .5 12.5 9 .0 15.0 11.0 13.5 9 .5 15.5 11.0 13.0 8 .0
TA = -40°C to +85°C CL = 50 pF M in 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.0 Max 15.0 10.5 14.0 10.5 16.0 12.0 15.0 10.5 16.5 12.5 14.0 9 .5 ns ns ns ns ns ns Units
3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5 .0
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74AC138 · 74ACT138
AC Electrical Characteristics for ACT
VCC Symbol tPLH tP H L tPLH tP H L tPLH tP H L Parameter 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 On Propagation Delay E3 to On
Note 8: Voltage Range 5.0 is 5.0V ± 0.5V
TA = +25°C CL = 50 pF Min 1 .5 1 .5 2 .5 2 .0 2 .5 2 .0 Typ 7.0 6.5 8.0 7.5 8.0 6.5 Max 10.5 10.5
TA = -40°C to +85°C CL = 50 pF M in 1 .5 1.5 2 .0 2 .0 2 .0 1 .5 Max 11.5 11.5 12.5 12.5 13.0 11.5 ns ns ns ns ns ns Units
(V) (Note 8) 5.0 5.0 5.0 5.0 5.0 5.0
11.5 11.5 12.0 10.5
Capacitance
Symbol CIN CPD Parameter Input Capacitance Power Dissipation Capacitance Typ 4.5 60.0 Units pF pF VCC = OPEN VCC = 5.0V Conditions
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