MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
1JUNE 2001MILITARY AND INDUSTRIAL TEMPERATURE RANGES
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
© 2002 Integrated Device Technology, Inc. DSC-5500/2
FEATURES:
• Std., A, C, and D 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
IDT54/74FCT257T/AT/CT/DT
FAST CMOS
QUAD 2-INPUT
MULTIPLEXER
DESCRIPTION:
The FCT257T is a high-speed quad 2-input multiplexer built using an
advanced dual metal CMOS technology. Four bits of data from two sources
can be selected using the common select input. The four buffered outputs
present the selected data in the true (non-inverting) form.
The FCT257T has a common Output Enable (OE) input. When OE is
high, all outputs are switched to a high-impedance state allowing the outputs
to interface directly with bus-oriented systems.
Three other multiplexers
OE
ZA
ZBZD
S
I1B I1D
I0B I0D
I1A
I0A
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
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IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
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.
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.
CERDIP/ SOIC/ QSOP
TOP VIEW
PIN DESCRIPTION
Pin Names Description
I0A–I0D Source 0 Data Inputs
I1A–I1D Source 1 Data Inputs
OE Output Enable (Active LOW)
S Select Input
ZA–ZDOutputs
FUNCTION TABLE(1)
Inputs
OE SI0I1Output Zx
HXXX Z
LHXL L
LHXH H
LLLX L
LLHX H
NOTE:
1 . H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedance
LCC
TOP VIEW
2
3
4
5
6
7
89
10
11
12
13
14
15
16
1
S
I0A
GND
ZB
I0B
I1B
I1A
OE
I0C
I1C
ZC
I0D
I1D
ZD
VCC
ZA
1
23
4
5
7
9
6
810 11 12 13 14
15
16
17
18
1920
NC
I0C
I1C
ZC
I0D
I
0A
S
Z
B
GND
NC
Z
D
I
1D
NC
V
CC
OE
INDEX
I1A
ZA
I1B
NC
I0B
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
3
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 — — ±1µA
IOZH High Impedance Output Current VCC = Max VO = 2.7V — — ±1µA
IOZL (3-State output pins)(4) VO = 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
VHInput Hysteresis — — 200 — m V
ICC Quiescent Power Supply Current VCC = Max., VIN = GND or VCC — 0.01 1 mA
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ±5%; 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.
5. This parameter is guaranteed but not tested.
Symbol Parameter Test Conditions(1) Min. Typ.(2) Max. Unit
VOH Output HIGH Voltage VCC = Min IOH = –8mA 2 .4 3.3 — V
VIN = VIH or VIL IOH = –15mA 2 3 —
VOL Output LOW Voltage VCC = Min IOL = 48mA — 0.3 0.5 V
VIN = VIH or VIL
IOS Short Circuit Current VCC = Max., VO = GND(3) –60 –120 –225 mA
IOFF Input/Output Power Off Leakage(5) VCC = 0V, VIN or VO
≤≤
≤≤
≤
4.5V — — ±1µA
OUTPUT DRIVE CHARACTERISTICS
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IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
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 0.25 mA/
Current(4) Outputs Open VIN = GND M Hz
OE = GND
One Input Toggling
50% Duty Cycle
ICTotal Power Supply Current(6) VCC = Max. VIN = VCC — 1.5 3.5 mA
Outputs Open VIN = GND
fo = 10MHz
50% Duty Cycle VIN = 3.4V — 1.8 4.5
OE = GND VIN = GND
One Bit Toggling
VCC = Max. VIN = VCC — 1.5 3.5(5)
Outputs Open VIN = GND
fo = 2.5MHz
50% Duty Cycle VIN = 3.4V — 2.5 7.5(5)
OE = GND VIN = GND
Four Bits 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. Values for these conditions are examples of ∆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.
POWER SUPPLY CHARACTERISTICS
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
5
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
FCT257AT FCT275CT FCT275DT
Symbol Parameter Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH Propagation Delay CL = 50pF 1.5 5 1.5 4.3 1.5 3.9 ns
tPHL Ix to Zx RL = 500Ω
tPLH Propagation Delay 1.5 7 1.5 5.2 1.5 4.4 ns
tPHL S to Zx
tPZH Output Enable Time 1.5 7 1.5 6 1.5 4.4 ns
tPZL
tPHZ Output Disable Time 1.5 5.5 1.5 5 1.5 4.4 ns
tPLZ
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - INDUSTRIAL
NOTES:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
FCT257T FCT275AT FCT275CT
Symbol Parameter Condition(1) Min.(2) Max. Min.(2) Max. Min.(2) Max. Unit
tPLH Propagation Delay CL = 50pF 1.5 7 1.5 5.8 1.5 5 ns
tPHL Ix to Zx RL = 500Ω
tPLH Propagation Delay 1.5 12 1.5 8.1 1.5 6 ns
tPHL S to Zx
tPZH Output Enable Time 1.5 10 1.5 8 1.5 6.8 ns
tPZL
tPHZ Output Disable Time 1.5 8 1.5 5.8 1.5 5.3 ns
tPLZ
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - MILITARY
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
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IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
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
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.
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.
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
IDT54/74FCT257T/AT/CT/DT
FAST CMOS QUAD 2-INPUT MULTIPLEXER
7
ORDERING INFORMATION
IDT XX
Temp. Range XXXX
Devic e Type XX
Package X
Process
Quad 2-Input Multiplexer (3-State)
257T
257AT
257CT
257DT
SO
Q
Industrial Options
Small Outline IC (300 mil)
Quarter-size Small Outline Package
54
74 – 55°C to +125°C
– 40°C to +85°C
D
L
Mili tary Options
CERDIP
Leadless Chip Carrier
Blank
BIndustrial
MIL-STD-883, Class B
FCT
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
