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Integrated Device Technology, Inc.
FAST CMOS 1-OF-8 DECODER WITH ENABLE
DESCRIPTION:
IDT54/74FCT138T/AT/CT
FEATURES:
* * * * Std., A and C speed 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 Product available in Radiation Tolerant and Radiation Enhanced versions Military product compliant to MIL-STD-883, Class B and DESC listed (dual marked) Available in DIP, SOIC, QSOP, CERPACK and LCC packages
* * * * *
The IDT54/74FCT138T/AT/CT are 1-of-8 decoders built using an advanced dual metal CMOS technology. The IDT54/ 74FCT138T/AT/CT accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active LOW outputs (O0-O7). The IDT54/74FCT138T/AT/CT 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/AT/CT devices and one inverter.
FUNCTIONAL BLOCK DIAGRAM
A2 A1 A0 E1 E2 E3
PIN CONFIGURATIONS
A0 A1 A2 E1 E2 E3 O7 GND 1 2 3 4 5 6 7 8 P16-1 D16-1 SO16-1 SO16-7 & E16-1 16 15 14 13 12 11 10 9 VCC O0 O1 O2 O3 O4 O5 O6
2570 drw 02
DIP/SOIC/QSOP/CERPACK TOP VIEW
INDEX
V CC
NC
1
A1 A0
32 A2
O7 O6 O5 O4 O3 O2 O1 O0
2570 drw 01
4 5 6 7 8
20 19 18 17 16 15 14
O0
O1 O2 NC O3 O4
E1 NC E2 E3
L20-2
9 10 11 12 13
GND NC
O7
LCC TOP VIEW
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
(c)1995 Integrated Device Technology, Inc.
O6
O5
2570 drw 03
APRIL 1995
DSC-4213/5
6.3
1
IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names A0-A2 Description Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs (Active LOW)
2570 tbl 01
E1, E2
E3
O0-O7
FUNCTION TABLE
Inputs Outputs 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
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
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
2570 tbl 02
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Rating Commercial VTERM(2) Terminal Voltage -0.5 to +7.0 with Respect to GND (3) Terminal Voltage VTERM -0.5 to with Respect to VCC +0.5 GND TA Operating 0 to +70 Temperature TBIAS Temperature -55 to +125 Under Bias TSTG Storage -55 to +125 Temperature PT Power Dissipation 0.5 IOUT DC Output Current -60 to +120 Military -0.5 to +7.0 Unit V
CAPACITANCE (TA = +25C, f = 1.0MHz)
Symbol Parameter(1) CIN Input Capacitance COUT Output Capacitance Conditions VIN = 0V VOUT = 0V Typ. 6 8 Max. Unit 10 pF 12
pF
2570 lnk 04
-0.5 to VCC +0.5 -55 to +125 -65 to +135 -65 to +150 0.5 -60 to +120
V
C C C
W mA
NOTE: 1. This parameter is measured at characterization but not tested.
2570 lnk 03 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. Input and VCC terminals only. 3. Outputs and I/O terminals only.
6.3
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IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Commercial: TA = 0C to +70C, VCC = 5.0V 5%; Military: TA = -55C to +125C, VCC = 5.0V 10%
Symbol VIH VIL II H II L II VIK IOS VOH Parameter Input HIGH Level Input LOW Level Input HIGH Input HIGH Current (4) Current (4) Input LOW 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 = Min., IN = -18mA VCC = Max.(3) , VO = GND IOH = -6mA MIL. IOH = -8mA COM'L. IOH = -12mA MIL. IOH = -15mA COM'L. IOL = 32mA MIL. IOL = 48mA COM'L.
--
Min. 2.0 -- -- -- -- -- -60 2.4 2.0 -- -- --
Typ.(2) -- -- -- -- -- -0.7 -120 3.3 3.0 0.3 200 0.01
Max. -- 0.8 1 1 1 -1.2 -225 -- -- 0.5 -- 1
Unit V V A A A V mA V V V mV mA
2570 tbl 05
VI = 2.7V VI = 0.5V
VCC = Max., VI = VCC (Max.)
VCC = Min. VIN = VIH or VIL
VOL VH ICC
Output LOW Voltage Input Hysteresis Quiescent Power Supply Current
VCC = Min. VIN = VIH or VIL VCC = Max. VIN = GND or VCC
NOTES: 1. For conditions shown as Max. or Min., 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 shorted at one time. Duration of the short circuit test should not exceed one second. 4. The test limit for this parameter is 5A at TA = -55C.
6.3
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IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current (4) Test Conditions(1) VCC = Max. VIN = 3.4V(3) VCC = Max. Outputs Open One Bit Toggling 50% Duty Cycle VCC = Max. Outputs Open Toggle E1, E2 or E3 50% Duty Cycle fo = 10MHz One Input and One Output Toggling Min. -- -- Typ.(2) 0.5 0.15 Max. 2.0 0.3 Unit mA mA/ MHz
VIN = VCC VIN = GND
IC
Total Power Supply Current (6)
VIN = VCC VIN = GND VIN = 3.4V VIN = GND
--
1.5
4.0
mA
--
1.8
5.0
NOTES: 1. For conditions shown as Max. or Min., 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. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested. 6. 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.
2570 tbl 06
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
FCT138T Com'l. Symbol Parameter Condition(1)
Min.
(2)
FCT138AT Mil. Com'l.
(2)
FCT138CT Com'l.
(2)
Mil.
(2)
Mil.
(2)
Max. Min.
(2)
Max. Min.
Max. Min.
Max. Min.
Max. Min.
Max.
Unit
tPLH tPHL tPLH tPHL tPLH tPHL
Propagation Delay An to On Propagation Delay E1 or E2 to On Propagation Delay E3 to On
CL = 50pF RL = 500
1.5 1.5 1.5
9.0 9.0 9.0
1.5 12.0 1.5 12.5 1.5 12.5
1.5 1.5 1.5
5.8 5.9 5.9
1.5 1.5 1.5
7.8 8.0 8.0
1.5 1.5 1.5
5.1 5.2 5.2
1.5 1.5 1.5
6.0 6.1 6.1
ns ns ns
2570 tbl 07
NOTES: 1. See test circuit and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delays.
6.3
4
IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS TEST CIRCUITS FOR ALL OUTPUTS
V CC 500 VIN Pulse Generator RT D.U.T. 50pF CL
2570 drw 04
SWITCH POSITION
Test
7.0V
Switch
Open Drain Disable Low Enable Low All Other Tests
Closed Open
VOUT
500
2570 tbl 08 DEFINITIONS: CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
SET-UP, HOLD AND RELEASE TIMES
PULSE WIDTH
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tSU
tH
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
2570 drw 05
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
tREM
1.5V
2570 drw 06
tSU
tH
PROPAGATION DELAY
ENABLE AND DISABLE TIMES
ENABLE DISABLE 3V CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 1.5V 0V 3.5V 1.5V tPHZ 0.3V VOH 0V
2570 drw 08
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
2570 drw 07
tPLZ
1.5V 0V 3.5V 0.3V VOL
NOTES: 1. Diagram shown for input Control Enable-LOW and input Control DisableHIGH 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns
6.3
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IDT54/74FCT138T/AT/CT FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT XX FCT Temp. Range X Family XXXX Device Type X Package X Process Blank B P D SO E L Q 138T 138AT 138CT Blank 54 74 Commercial MIL-STD-883, Class B Plastic DIP CERDIP Small Outline IC CERPACK Leadless Chip Carrier Quarter-size Small Outline Package 1-of-8 Decoder
High Drive -55C to +125C 0C to +70C
2570 drw 09
6.3
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