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FAST CMOS QUAD 2-INPUT MULTIPLEXER
Integrated Device Technology, Inc.
IDT54/74FCT157T/AT/CT/DT IDT54/74FCT257T/AT/CT/DT IDT54/74FCT2257T/AT/CT
FEATURES:
* Common features: - Low input and output leakage 1A (max.) - CMOS power levels - True TTL input and output compatibility - VOH = 3.3V (typ.) - VOL = 0.3V (typ.) - 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, SSOP, QSOP, CERPACK and LCC packages * Features for FCT157T/257T: - Std., A, C and D speed grades - High drive outputs (-15mA IOH, 48mA IOL) * Features for FCT2257T: - Std., A, and C speed grades - Resistor outputs (-15mA IOH, 12mA IOL Com.) (-12mA IOH, 12mA IOL Mil.) - Reduced system switching noise
DESCRIPTION:
The FCT157T, FCT257T/FCT2257T are high-speed quad 2-input multiplexers 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 FCT157T has a common, active-LOW, enable input. When the enable input is not active, all four outputs are held LOW. A common application of `FCT157T is to move data from two different groups of registers to a common bus. Another application is as a function generator. The `FCT157T can generate any four of the 16 different functions of two variables with one variable common. The FCT257T/FCT2257T have 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. The FCT2257T has balanced output drive with current limiting resistors. This offers low ground bounce, minimal undershoot and controlled output fall times-reducing the need for external series terminating resistors. FCT2xxxT parts are plug-in replacements for FCTxxxT parts.
FUNCTIONAL BLOCK DIAGRAM
S
PIN CONFIGURATIONS
S I 0A I1A ZA I0B I1B ZB GND
1 2 3 4 5 6 7 8 16 15
157 Only
E 3 other multiplexers
P16-1, D16-1, SO16-1, SO16-7 & E16-1
14 13 12 11 10 9
I1B -I1D I0B -I0D
Z B-Z D
Vcc E or OE* I0C I1C ZC I0D I 1D ZD
2537 drw 02
DIP/SOIC/QSOP/CERPACK TOP VIEW
ZA
I0A S NC Vcc E or OE*
3 2 1 4 5 6 7 8 20 19 18 17 16 15 14 9 10 11 12 13
I1A I 0A 257 Only OE
INDEX
2537 drw 01
I1A ZA NC I0B I1B
L20-2
I0C I1C NC ZC I0D
LCC TOP VIEW
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
ZB GND NC ZD I1D
2537 drw 03
*
E
for FCT157, OE for FCT257/FCT2257.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
(c)1996 Integrated Device Technology, Inc.
JUNE 1996
2537/6
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IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT- 2257T/AT/CT FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
PIN DESCRIPTION
Pin Names I0A-I0D I1A-I1D
E OE
FUNCTION TABLE(1)
Description Inputs
E OE
Output ZN I0 X X X L H I1 X L H X X 157 L L H L H 257 Z L H L H
2537 tbl 02
Source 0 Data Inputs Source 1 Data Inputs Enable Input (Active LOW)-FCT157T Output Enable (Active LOW)-FCT257T/2257T Select Input Outputs
2537 tbl 01
/OE H L L L L
S X H H L L
S ZA-ZD
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High Impedance
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Rating Commercial VTERM(2) Terminal Voltage -0.5 to +7.0 with Respect to GND VTERM(3) Terminal Voltage -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
2537 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.
2537 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.
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IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT - 2257T/AT/CT FAST CMOS QUAD 2-INPUT MULTIPLEXER
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 IOZH IOZL II VIK VH ICC Parameter Input HIGH Level Input LOW Level Input HIGH Input LOW Current (4) Current (4) VCC = Max. pins) (4) VCC = Min., IIN = -18mA
--
Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max. VI = 2.7V VI = 0.5V VO = 2.7V VO = 0.5V VCC = Max., VI = VCC (Max.)
Min. 2.0 -- -- -- -- -- -- -- -- --
Typ.(2) -- -- -- -- -- -- -- -0.7 200 0.01
Max. -- 0.8
Unit V V
1 1 1 1 1
-1.2 -- 1
A A A
V mV mA
2537 lnk 05
High Impedance Output Current (3-State Output Input HIGH Current (4)
Clamp Diode Voltage Input Hysteresis Quiescent Power Supply Current
VCC = Max., VIN = GND or VCC
OUTPUT DRIVE CHARACTERISITICS FOR FCT157/257T
Symbol VOH Parameter Output HIGH Voltage Test Conditions(1) VCC = Min. IOH = -6mA MIL. VIN = VIH or VIL IOH = -8mA COM'L. IOH = -12mA MIL. IOH = -15mA COM'L. VCC = Min. IOL = 32mA MIL. VIN = VIH or VIL IOL = 48mA COM'L. VCC = Max., VO = GND (3) VCC = 0V, VIN or VO 4.5V Min. 2.4 2.0 -- -60 -- Typ.(2) 3.3 3.0 0.3 -120 -- Max. -- -- 0.50 -225 Unit V V V mA
VOL IOS IOFF
Output LOW Voltage Short Circuit Current Input/Output Power Off Leakage(5)
1
A
2537 tbl 06
OUTPUT DRIVE CHARACTERISTICS FOR FCT2257T
Symbol IODL IODH VOH VOL Parameter Output LOW Current Output HIGH Current Output HIGH Voltage Output LOW Voltage Test Conditions(1) VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V (3) VCC = 5V, VIN = VIH or V IL, VOUT = 1.5V (3) VCC = Min. VIN = VIH or VIL VCC = Min. VIN = VIH or VIL IOH = -12mA MIL. IOH = -15mA COM'L. IOL = 12mA Min. 16 -16 2.4 -- Typ.(2) 48 -48 3.3 0.3 Max. -- -- -- 0.50 Unit mA mA V V
2537 lnk 07
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. 5. This parameter is guaranteed but not tested.
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IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT- 2257T/AT/CT FAST CMOS QUAD 2-INPUT MULTIPLEXER
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 = 3.4(3) VCC = Max. Outputs Open E or OE = GND One Bit Toggling 50% Duty Cycle VCC = Max. Outputs Open fO = 10MHz 50% Duty Cycle
E
Min. -- FCTxxxT --
Typ.(2) 0.5 0.15
Max. 2.0 0.25
Unit mA mA/ MHz
VIN = VCC VIN = GND
FCT2xxxT VIN = VCC VIN = GND VIN = 3.4 VIN = GND VIN = VCC VIN = GND VIN = 3.4 VIN = GND FCTxxxT FCT2xxxT FCTxxxT FCT2xxxT FCTxxxT FCT2xxxT FCTxxxT FCT2xxxT
-- -- -- --
0.06 1.5 0.6 1.8 0.9
0.12 3.5 2.2 4.5 3.2 3.5 (5) 2.2 (5) 7.5 (5) 6.2 (5)
2537 tbl 06
IC
Total Power Supply Current (6)
mA
or OE = GND -- 1.5 0.6 2.5 1.6
One Bit Toggling VCC = Max. Outputs Open fO = 2.5MHz 50% Duty Cycle
E
or OE = GND
Four Bits Toggling
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 Output 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.
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IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT - 2257T/AT/CT FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - FCT157T
FCT157T Com'l. Symbol Parameter Condition(1) Min.(2) Max. Mil. Min.(2) Max. Com'l. Min.(2) Max. FCT157AT Mil. Min.(2) Max. Unit
tPLH tPHL tPLH tPHL tPLH tPHL
Propagation Delay IN to ZN Propagation Delay E to ZN Propagation Delay S to ZN
CL = 50pF RL = 500
1.5 1.5 1.5
6.0 10.5 10.5
1.5 1.5 1.5
7.0 12.0 12.0
1.5 1.5 1.5
5.0 6.0 7.0
1.5 1.5 1.5
5.8 7.4 8.1
ns ns ns
2537 tbl 07
FCT157CT Com'l. Symbol Parameter Condition(1) Min.(2) Max. Mil. Min.(2) Max. Com'l. Min.(2)
FCT157DT Mil. Min.(2) Max. Unit
Max.
tPLH tPHL tPLH tPHL tPLH tPHL
Propagation Delay IN to ZN Propagation Delay E to ZN Propagation Delay S to ZN
CL = 50pF RL = 500
1.5 1.5 1.5
4.3 4.8 5.2
1.5 1.5 1.5
5.0 5.9 6.0
1.5 1.5 1.5
3.9 4.4 4.6
-- -- --
-- -- --
ns ns ns
2537 tbl 08
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - FCT257/2257T
FCT257/2257T Com'l. Symbol Parameter Condition(1) Min.(2) Max. Mil. Min.(2) Max. FCT257/2257AT Com'l. Min.(2) Max. Mil. Min.(2) Max. Unit
tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ
Propagation Delay IN to ZN Propagation Delay S to ZN Output Enable Time Output Disable Time
CL = 50pF RL = 500
1.5 1.5 1.5 1.5
6.0 10.5 8.5 6.0
1.5 1.5 1.5 1.5
7.0 12.0 10.0 8.0
1.5 1.5 1.5 1.5
5.0 7.0 7.0 5.5
1.5 1.5 1.5 1.5
5.8 8.1 8.0 5.8
ns ns ns ns
2537 tbl 09
FCT257/2257CT Com'l. Symbol Parameter Condition(1) Min.(2) Max. Mil. Min.(2) Max. Com'l. Min.(2)
FCT257DT Mil. Min.(2) Max. Unit
Max.
tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ
Propagation Delay IN to ZN Propagation Delay S to ZN Output Enable Time Output Disable Time
CL = 50pF RL = 500
1.5 1.5 1.5 1.5
4.3 5.2 6.0 5.0
1.5 1.5 1.5 1.5
5.0 6.0 6.8 5.3
1.5 1.5 1.5 1.5
3.9 4.4 4.4 4.4
-- -- -- --
-- -- -- --
ns ns ns ns
2537 tbl 10
NOTES: 1. See test circuits and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delay.
6.6
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IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT- 2257T/AT/CT FAST CMOS QUAD 2-INPUT MULTIPLEXER
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 500 VOUT 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Open
2537 lnk 11 DEFINITIONS: CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Switch
Closed
2537 drw 04
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
2537 drw 05
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
tREM
1.5V
2537 drw 06
tSU
tH
PROPAGATION DELAY
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
2537 drw 07
ENABLE AND DISABLE TIMES
ENABLE 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
2537 drw 08
DISABLE 3V 1.5V 0V 3.5V 0.3V VOL
tPLZ
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
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IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT - 2257T/AT/CT FAST CMOS QUAD 2-INPUT MULTIPLEXER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
ORDERING INFORMATION
IDT XX FCT X Family XXXX Device Type X Package X Process
Temperature Range
Blank B P D SO L E Q
Commercial MIL-STD-883, Class B Plastic DIP CERDIP Small Outline IC Leadless Chip Carrier CERPACK Quarter-size Small Outline Package
Quad 2-Input Multiplexer 157T Quad 2-Input Multiplexer (3-state) 257T 157AT 257AT 157CT 257CT 157DT 257DT Blank 2 54 74 High Drive Balanced Drive -55C to +125C 0C to +70C
2537 drw 09
6.6
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