MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
1JUNE 2002MILITARY AND INDUSTRIAL TEMPERATURE RANGES
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
© 2002 Integrated Device Technology, Inc. DSC-2570/9
FEATURES:
• Std., A, and C grades
• Low input and output leakage ≤≤
≤≤
≤1µA (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
FUNCTIONAL BLOCK DIAGRAM
IDT54/74FCT138T/AT/CT
FAST CMOS
1-OF-8 DECODER
WITH ENABLE
DESCRIPTION:
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.
O7O6O5O4O3O2O1O0
A1
A2A0E1E2E3
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
2
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
PIN CONFIGURATION
Symbol Description Max Unit
VTERM(2) Terminal Voltage with Respect to GND –0.5 to +7 V
VTERM(3) Terminal Voltage with Respect to GND –0.5 to VCC+0.5 V
TSTG Storage Temperature –65 to +150 °C
IOUT DC Output Current –60 to +120 mA
ABSOLUTE MAXIMUM RATINGS(1)
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.
2
3
4
5
6
7
89
10
11
12
13
14
15
16
1
A0
A1
E1
GND
O7
E3
A2
E2
O0
O1
O2
O3
O4
O5
O6
VCC
1
23
4
5
7
9
6
810 11 12 13 14
15
16
17
18
1920
NC
O1
O2
O3
O4
A
1
A
0
O
7
GND
NC
O
6
O
5
NC
V
CC
O
0
INDEX
A2
E1
E3
NC
E2
CERDIP/ SOIC/ QSOP
TOP VIEW LCC
TOP VIEW
Pin Names Description
A0 - A2Address Inputs
E1, E2Enable Inputs (Active LOW)
E3Enable Input (Active HIGH)
O0 - O7Outputs (Active LOW)
PIN DESCRIPTION
Symbol Parameter(1) Conditions Typ. Max. Unit
CIN Input Capacitance VIN = 0V 6 10 pF
COUT Output Capacitance VOUT = 0V 8 12 pF
CAPACITANCE (TA = +25°C, F = 1.0MHz)
NOTE:
1. This parameter is measured at characterization but not tested.
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
3
NOTE:
1 . H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
FUNCTION TABLE(1)
Inputs Outputs
E1E2E3A0A1A2O0O1O2O3O4O5O6O7
H X XX XXHHH HHHH H
X H XX XXHHH HHHH H
X X LX XXHHH HHHH H
L LHL LL LHH HHHH H
L LHH LLHLH HHHH H
L LHLHL HHL HHHH H
L LHHHLHHH LHHH H
L L HL LHHHH HLHH H
L LHH LHHHHHHLH H
L LHLHHHHH HHH L H
L LHHHHHHH HHHH L
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
VIH Input HIGH Level Guaranteed Logic HIGH Level 2 — — V
VIL Input LOW Level Guaranteed Logic LOW Level — — 0.8 V
IIH Input HIGH Current(4) VCC = Max. VI = 2.7V — — ±1µA
IIL Input LOW Current(4) VCC = Max. VI = 0.5V — — ±1
IIInput HIGH Current(4) VCC = Max., VI = VCC (Max.) — — ±1µA
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V
IOS Short Circuit Current VCC = Max., VO = GND(3) –60 –120 –225 mA
VOH Output HIGH Voltage VCC = Min IOH = –6mA MIL 2.4 3.3 —
VIN = VIH or VIL IOH = –8mA IND V
IOH = –12mA MIL 2 3 —
IOH = –15mA IND
VOL Output LOW Voltage VCC = Min IOL = –32mA MIL — 0.3 0.5 V
VIN = VIH or VIL IOL = –48mA IND
VHInput Hysteresis — — 200 — mV
ICC Quiescent Power Supply Current VCC = Max. — 0.01 1 µA
VIN = GND or VCC
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±10%; Military: TA = –55°C to +125°C, VCC = 5.0V ±10%
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, +25°C 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 ±5µA at TA = –55°C.
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
4
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
∆ICC Quiescent Power Supply Current VCC = Max. — 0.5 2 mA
TTL Inputs HIGH VIN = 3.4V(3)
ICCD Dynamic Power Supply VCC = Max. VIN = VCC — 0.15 0.3 mA/
Current(4) Outputs Open VIN = GND M Hz
One Input Toggling
50% Duty Cycle
ICTotal Power Supply Current(5) VCC = Max. VIN = VCC — 1.5 4 mA
Outputs Open VIN = GND
Toggle E1, E2, or E3
50% Duty Cycle VIN = 3.4V — 1.8 5
fo = 10MHz VIN = GND
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, +25°C 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.
POWER SUPPLY CHARACTERISTICS
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
54FCT138T 54/74FCT138AT 54/74FCT138CT
Mil. Ind. Mil. Ind. Mil.
Symbol Parameter Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH Propagation Delay CL = 50pF 1.5 12 1.5 5.8 1.5 7.8 1.5 5.1 1.5 6 ns
tPHL Ax to OxRL = 500Ω
tPLH Propagation Delay 1.5 12.5 1.5 5.9 1.5 8 1.5 5.2 1.5 6.1 ns
tPHL E1 or E2 to Ox
tPLH Propagation Delay 1.5 12.5 1.5 5.9 1.5 8 1.5 5.2 1.5 6.1 ns
tPHL E3 to Ox
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
5
Pulse
Generator
RT
D.U.T
.
VCC
VIN
CL
VOUT
50pF 500Ω
500Ω
7.0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CO NTROL
tSU tH
tREM
tSU tH
HIGH-LOW-HIGH
PULSE
LOW-HIGH-LOW
PULSE
tW
1.5V
1.5V
SAME PHASE
INPUT TRANSITION
3V
1.5V
0V
1.5V
VOH
tPLH
OUTPUT
OPPOSITE PHASE
INPUT TRANSITION
3V
1.5V
0V
tPLH tPHL
tPHL
VOL
CONTROL
INPUT
3V
1.5V
0V
3.5V
0V
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
CLOSED
SWITCH
OPEN
VOL
0.3V
0.3V
tPLZtPZL
tPZH tPHZ
3.5V
0V
1.5V
1.5V
ENABLE DISABLE
VOH
PRESET
CLEAR
CLOCK ENABLE
ETC.
Octal link
Octal link
Octal link
Octal link
Octal link
TEST CIRCUITS AND WAVEFORMS
Propagation Delay
Test Circuits for All Outputs
Enable and Disable Times
Set-Up, Hold, and Release Times
Pulse Width
Test Switch
Open Drain
Disable Low Closed
Enable Low
All Other Tests Open
SWITCH POSITION
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
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.
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
6
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER WITH ENABLE
ORDERING INFORMATION
IDT XX
Temp. Range XXXX
Device Type XX
Package X
Process
SO
Q
Industrial Options
Small Outline IC
Quarter-size Small Outline Package
1-of-8 Decoder
54
74 – 55°C to +125°C
– 40°C to +85°C
D
L
Military Opt ions
CERDIP
Leadless Chip Carrier
Blank
BIndustrial
MIL-STD-883, Class B
FCT
138T
138AT
138CT
CORPORATE HEADQUARTERS for SALES: for Tech Support:
2975 Stender Way 800-345-7015 or 408-727-6116 logichelp@idt.com
Santa Clara, CA 95054 fax: 408-492-8674 (408) 654-6459
www.idt.com
3/25/2002 Removed standard speed grade
6/20/2002 Updated as per PNC Logic-00-07 and Logic-01-04
DATA SHEET DOCUMENT HISTORY