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IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
FAST CMOS 1-OF-8 DECODER WITH ENABLE
FEATURES:
* * * *
IDT54/74FCT138T/AT/CT
* * * * *
Std., A, and C grades Low input and output leakage 1A (max.) CMOS power levels True TTL input and output compatibility: - VOH = 3.3V (typ.) - VOL = 0.3V (typ.) High Drive outputs (-15mA IOH, 48mA IOL) Meets or exceeds JEDEC standard 18 specifications Military product compliant to MIL-STD-883, Class B and DESC listed (dual marked) Power off disable outputs permit "live insertion" Available in the following packages: - Industrial: SOIC, QSOP - Military: CERDIP, LCC
The IDT54/74FCT138T is a 1-of-8 decoder built using an advanced dual metal CMOS technology. The IDT54/74FCT138T accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active low outputs (O0 - O7). The IDT54/74FCT138T 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 IDT54/74FCT138T devices and one inverter.
DESCRIPTION:
FUNCTIONAL BLOCK DIAGRAM
A2 A1 A0 E1 E2 E3
O7
O6
O5
O4
O3
O2
O1
O0
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
1
JUNE 2002
DSC-2570/9
(c) 2002 Integrated Device Technology, Inc.
IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
NC
A1
A0
A0 A1 A2 E1 E2 E3 O7 GND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VCC O0 O1 O2 O3 O4 O5 O6 A2 E1 NC E2 E3
4 5 6 7 8
3
2 1
20
19 18 17 16 15 14
O0
INDEX
VCC
O1 O2 NC O3 O4
9
10
11
12
13
O6
CERDIP/ SOIC/ QSOP TOP VIEW
LCC TOP VIEW
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Max -0.5 to +7 -0.5 to VCC+0.5 -65 to +150 -60 to +120 Unit V V C mA VTERM(2) Terminal Voltage with Respect to GND VTERM(3) Terminal Voltage with Respect to GND TSTG IOUT Storage Temperature DC Output Current
PIN DESCRIPTION
Pin Names A0 - A2 E1, E2 E3 O0 - O7 Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs (Active LOW) Description
NOTES: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. No terminal voltage may exceed Vcc by =0.5V unless otherwise noted. 2. Inputs and Vcc terminals only. 3. Output and I/O terminals only.
CAPACITANCE (TA = +25C, F = 1.0MHz)
Symbol CIN COUT Parameter(1) Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Typ. 6 8 Max. 10 12 Unit pF pF
NOTE: 1. This parameter is measured at characterization but not tested.
2
GND
NC
O7
O5
IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
FUNCTION TABLE(1)
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 O3 H H H H H H L H H H H Outputs 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
NOTE: 1. H = HIGH Voltage Level X = Don't Care L = LOW Voltage Level
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%; Military: TA = -55C to +125C, VCC = 5.0V 10%
Symbol VIH VIL IIH IIL II VIK IOS VOH Parameter Input HIGH Level Input LOW Level Input HIGH Current(4) Input LOW Current(4) Input HIGH Current(4) Clamp Diode Voltage Short Circuit Current Output HIGH Voltage Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max. VCC = Max. VCC = Max., VI = VCC (Max.) VCC = Min., IIN = -18mA VCC = Max., VO = VCC = Min VIN = VIH or VIL GND(3) IOH = -6mA MIL IOH = -8mA IND IOH = -12mA MIL IOH = -15mA IND IOL = -32mA MIL IOL = -48mA IND -- VCC = Max. VIN = GND or VCC VI = 2.7V VI = 0.5V Min. 2 -- -- -- -- -- -60 2.4 2 -- -- -- Typ.(2) -- -- -- -- -- -0.7 -120 3.3 3 0.3 200 0.01 Max. -- 0.8 1 1 1 -1.2 -225 -- -- 0.5 -- 1 V mV mA A V mA V Unit V V A
VOL VH ICC
Output LOW Voltage Input Hysteresis Quiescent Power Supply Current
VCC = Min VIN = VIH or VIL
NOTES: 1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 5.0V, +25C ambient. 3. Not more than one output should be tested at one time. Duration of the test should not exceed one second. 4. The test limit for this parameter is 5A at TA = -55C.
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IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) VCC = Max. VIN = 3.4V(3) VCC = Max. Outputs Open One Input Toggling 50% Duty Cycle VCC = Max. Outputs Open Toggle E1, E2, or E3 50% Duty Cycle fo = 10MHz One Input and One Output Toggling
NOTES: 1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 5.0V, +25C ambient. 3. Per TTL driven input; (VIN = 3.4V). All other inputs at VCC or GND. 4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. 5. IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ICC DHNT + ICCD (fONO) ICC = Quiescent Current ICC = Power Supply Current for a TTL High Input (VIN = 3.4V) DH = Duty Cycle for TTL Inputs High NT = Number of TTL Inputs at DH ICCD = Dynamic Current caused by an Input Transition Pair (HLH or LHL) fO = Output Frequency NO = Number of Outputs at fO All currents are in milliamps and all frequencies are in megahertz.
Test Conditions(1)
Min. --
Typ.(2) 0.5 0.15
Max. 2 0.3
Unit mA mA/ MHz
VIN = VCC VIN = GND
--
IC
Total Power Supply Current(5)
VIN = VCC VIN = GND VIN = 3.4V VIN = GND
--
1.5
4
mA
--
1.8
5
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Symbol tPLH tPHL tPLH tPHL tPLH tPHL Parameter Propagation Delay Ax to Ox Propagation Delay E1 or E2 to Ox Propagation Delay E3 to Ox Condition CL = 50pF RL = 500
(1)
54FCT138T Mil. (2) Min. Max. 1.5 12 1.5 1.5 12.5 12.5
54/74FCT138AT Ind. Mil. (2) (2) Min. Max. Min. Max. 1.5 5.8 1.5 7.8 1.5 1.5 5.9 5.9 1.5 1.5 8 8
54/74FCT138CT Ind. Min. 1.5 1.5 1.5
(2)
Mil. Max. 5.1 5.2 5.2 Min. 1.5
(2)
Max. 6 6.1 6.1
Unit ns ns ns
1.5 1.5
NOTES: 1. See test circuit and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delays.
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IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
V CC 500 VIN Pulse Generator RT D.U.T . VOUT 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
50pF CL
500
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Octal link
Test Circuits for All Outputs
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC.
tSU
tH
tREM
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
Octal link
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
Octal link
1.5V
1.5V
tSU
tH
Pulse Width
Set-Up, Hold, and Release Times
ENABLE SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
Octal link
DISABLE 3V 1.5V
CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 3.5V 1.5V tPHZ 0.3V 1.5V 0V tPLZ
0V 3.5V 0.3V VOL VOH 0V
Octal link
Propagation Delay
Enable and Disable Times
NOTES: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns.
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IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER WITH ENABLE
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
ORDERING INFORMATION
FCT IDT XX XXXX Temp. Range Device Type XX Package X Process Blank B Industrial MIL-STD-883, Class B Industrial Options Small Outline IC Quarter-size Small Outline Package Military Options CERDIP Leadless Chip Carrier
SO Q
D L
138T 138AT 138CT
1-of-8 Decoder
54 74
- 55C to +125C - 40C to +85C
DATA SHEET DOCUMENT HISTORY
3/25/2002 6/20/2002 Removed standard speed grade Updated as per PNC Logic-00-07 and Logic-01-04
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
for Tech Support: logichelp@idt.com (408) 654-6459
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