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PDF IDT74FCT257TLB Data sheet ( Hoja de datos )

Número de pieza IDT74FCT257TLB
Descripción FAST CMOS QUAD 2-INPUT MULTIPLEXER
Fabricantes Integrated Device Tech 
Logotipo Integrated Device Tech Logotipo



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Integrated Device Technology, Inc.
FAST CMOS
QUAD 2-INPUT
MULTIPLEXER
IDT54/74FCT157T/AT/CT/DT
IDT54/74FCT257T/AT/CT/DT
IDT54/74FCT2257T/AT/CT
FEATURES:
• Common features:
– Low input and output leakage 1µA (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
FUNCTIONAL BLOCK DIAGRAM
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.
PIN CONFIGURATIONS
S
157 Only E
I1B –I1D
I0B –I0D
3 other multiplexers
Z B–Z D
S
I0A
I1A
ZA
I0B
I1B
ZB
GND
1 16
2 15
3
P16-1,
D16-1,
14
4 SO16-1, 13
5 SO16-7 12
6 & 11
7 E16-1 10
89
Vcc
E or OE*
I0C
I1C
ZC
I0D
I 1D
ZD
DIP/SOIC/QSOP/CERPACK
TOP VIEW
2537 drw 02
I1A
I0A
257 Only OE
ZA
2537 drw 01
INDEX
3 2 20 19
I1A 4
1 18 I0C
ZA 5 L20-2 17 I1C
NC 6
16 NC
I0B 7
15 ZC
I1B 8
14 I0D
9 10 11 12 13
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
LCC
TOP VIEW
* E for FCT157, OE for FCT257/FCT2257.
©1996 Integrated Device Technology, Inc.
6.6
2537 drw 03
JUNE 1996
2537/6
1

1 page




IDT74FCT257TLB pdf
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
FCT157AT
Symbol
Parameter
tPLH Propagation Delay IN to ZN
tPHL
tPLH Propagation Delay E to ZN
tPHL
tPLH Propagation Delay S to ZN
tPHL
Condition(1)
CL = 50pF
RL = 500
Com'l.
Min.(2) Max.
1.5 6.0
Mil.
Min.(2) Max.
1.5 7.0
Com'l.
Min.(2) Max.
1.5 5.0
Mil.
Min.(2) Max.
1.5 5.8
Unit
ns
1.5 10.5 1.5 12.0 1.5 6.0 1.5 7.4 ns
1.5 10.5 1.5 12.0 1.5 7.0 1.5 8.1 ns
2537 tbl 07
Symbol
Parameter
tPLH Propagation Delay IN to ZN
tPHL
tPLH Propagation Delay E to ZN
tPHL
tPLH Propagation Delay S to ZN
tPHL
Condition(1)
CL = 50pF
RL = 500
FCT157CT
Com'l.
Min.(2) Max.
1.5 4.3
Mil.
Min.(2) Max.
1.5 5.0
FCT157DT
Com'l.
Min.(2) Max.
1.5 3.9
Mil.
Min.(2) Max.
——
Unit
ns
1.5 4.8 1.5 5.9 1.5 4.4
— ns
1.5 5.2 1.5 6.0 1.5 4.6
— ns
2537 tbl 08
SWITCHING CHARACTERISTICS OVER OPERATING RANGE – FCT257/2257T
FCT257/2257T
FCT257/2257AT
Symbol
Parameter
tPLH Propagation Delay IN to ZN
tPHL
tPLH Propagation Delay S to ZN
tPHL
tPZH Output Enable Time
tPZL
tPHZ Output Disable Time
tPLZ
Condition(1)
CL = 50pF
RL = 500
Com'l.
Min.(2) Max.
1.5 6.0
Mil.
Min.(2) Max.
1.5 7.0
Com'l.
Min.(2) Max.
1.5 5.0
Mil.
Min.(2) Max.
1.5 5.8
Unit
ns
1.5 10.5 1.5 12.0 1.5 7.0 1.5 8.1 ns
1.5 8.5 1.5 10.0 1.5 7.0 1.5 8.0 ns
1.5 6.0 1.5 8.0 1.5 5.5 1.5 5.8 ns
2537 tbl 09
FCT257/2257CT
FCT257DT
Com'l.
Symbol
Parameter
Condition(1)
Min.(2) Max.
tPLH Propagation Delay IN to ZN
tPHL
CL = 50pF
1.5 4.3
RL = 500
tPLH Propagation Delay S to ZN
tPHL
1.5 5.2
tPZH Output Enable Time
tPZL
1.5 6.0
tPHZ Output Disable Time
1.5
tPLZ
NOTES:
1. See test circuits and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delay.
5.0
Mil.
Min.(2) Max.
1.5 5.0
1.5 6.0
1.5 6.8
1.5 5.3
Com'l.
Min.(2) Max.
1.5 3.9
1.5 4.4
1.5 4.4
1.5 4.4
Mil.
Min.(2) Max.
——
Unit
ns
— — ns
— — ns
— — ns
2537 tbl 10
6.6 5

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