IDT74FST32390Q [IDT]
Multiplexer, CBT/FST/QS/5C/B Series, 8-Func, 8 Line Input, 1 Line Output, True Output, CMOS, PDSO28, QSOP-28;
| 型号： | IDT74FST32390Q |
| 厂家： | 
INTEGRATED DEVICE TECHNOLOGY |
| 描述： | Multiplexer, CBT/FST/QS/5C/B Series, 8-Func, 8 Line Input, 1 Line Output, True Output, CMOS, PDSO28, QSOP-28 光电二极管 逻辑集成电路 |
| 文件： | 总5页 (文件大小：94K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OCTAL 2:1 MULTIPLEXER
BUS SWITCH
IDT74FST32390
generatelittleornonoiseoftheirownwhileprovidingalowresistancepath
foranexternaldriver. Thesedevicesconnectinputandoutputportsthrough
an n-channel FET. When the gate-to-source junction of this FET is
adequatelyforward-biasedthedeviceconductsandtheresistancebetween
inputandoutputportsissmall. Withoutadequatebiasonthegate-to-source
junctionoftheFET,theFETis turnedoff,thereforewithnoVCCapplied,the
device has hotinsertioncapability.
FEATURES:
−
−
−
−
−
Bus switches provide zero delay paths
Extended commercial range of –40°C to +85°C
Low switch on-resistance: FST32xxx – 28Ω
TTL-compatible input and output levels
ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
−
Available in SOIC, QSOP, and TSSOP Packages
Thelowon-resistanceandsimplicityoftheconnectionbetweeninputand
outputports reduces the delayinthis pathtoclose tozero.
The FST32390 integrates terminating resistors in the device, thus
eliminatingthe needforexternal25Ωseries resistors.
DESCRIPTION:
The FST32390 belongs to IDT's family of Bus switches. Bus switch
devices perform the function of connecting or isolating two ports without
providing any inherent current sink or source capability. Thus they
The FST32390is an8-bitTTL-compatible 2:1bus multiplexer. AEN =
0 connects port A to port C and BEN = 0 connects port B to port C. This
device can be used to connect ports A & B to a common bus on port C or
to broadcast data on port C to both ports A and B.
PINCONFIGURATION
FUNCTIONALBLOCKDIAGRAM
1
2
28
27
26
25
24
A0
Vcc
A7
B0
C0
A0
C0
C7
B7
3
4
C7
A6
B6
C6
A5
A1
B1
5
A7
C1
A2
B2
C2
A3
6
23
22
21
SO28-2
SO28-8
SO28-9
7
AEN
8
9
B5
C5
20
19
B0
10
B3
C3
11
12
13
14
A4
B4
18
17
B7
AEN
GND
C4
16
15
BEN
BEN
SOIC/ QSOP/ TSSOP
TOP VIEW
COMMERCIAL TEMPERATURE RANGE
OCTOBER 1999
1
c
1999 Integrated Device Technology, Inc.
DSC-5528/-
IDT74FST32390
OCTAL2:1MULTIPLEXERBUSSWITCH
COMMERCIALTEMPERATURERANGE
ABSOLUTE MAXIMUM RATINGS(1)
PIN DESCRIPTION
Pin Names
I/O
Description
Symbol
Rating
Max.
–0.5 to +7
–65 to +150
128
Unit
V
A0-7
I/O
Bus A
Bus B
Bus C
(2)
VTERM
Terminal Voltage with Respect to GND
Storage Temperature
B0-7
C0-7
I/O
I/O
I
TSTG
IOUT
°C
Maximum Continuous Channel Current
mA
FST LINK
AEN, BEN
Bus Switch Enable (Active LOW)
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.
FUNCTION TABLE(1)
AEN
BEN
A
B
Description
H
H
Off
Off
Disconnect
L
H
L
L
On
Off
On
Off
On
On
A to C
2. Vcc, Control, and Switch terminals.
H
B to C
A, B to C
L
CAPACITANCE (1)
NOTE:
1. H = HIGH
L = LOW
Symbol
Parameter
Conditions(2)
Typ. Unit
CIN
Control Input Capacitance
4
pF
pF
CI/O
Switch Input/Output
Capacitance
Switch Off
NOTES:
1. Capacitance is characterized but not tested.
2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: TA = –40°C to +85°C, VCC = 5.0V ± 5%
Symbol
Parameter
Input HIGH Voltage
Test Conditions(1)
Min.
Typ.(2)
Max.
Unit
VIH
Guaranteed Logic HIGH for Control Inputs
2
—
—
V
VIL
IIH
Input LOW Voltage
Guaranteed Logic LOW for Control Inputs
—
—
—
—
—
—
—
17
—
—
0.8
±1
±1
±1
±1
—
V
Input HIGH Current
VCC = Max.
VCC = Max.
VI = VCC
µA
IIL
Input LOW Voltage
VI = GND
VO = VCC
VO = GND
—
IOZH
IOZL
IOS
High Impedance Output Current
(3-State Output pins)
Short Circuit Current
Clamp Diode Voltage
Switch On Resistance(4)
—
µA
—
(3)
VCC = Max., VO = GND
VCC = Min., IIN = –18mA
VCC = Min. VIN = 0.0V
ION = 30mA
300
–0.7
28
mA
V
VIK
RON
–1.2
40
Ω
VCC = Min. VIN = 2.4V
ION = 15mA
20
35
48
Ω
IOFF
ICC
Input/Output Power Off Leakage
Quiescent Power Supply Current
VCC = 0V, VIN or VO ≤ 4.5V
—
—
—
±1
3
µA
µA
VCC = Max., VI = GND or VCC
0.1
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, +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. Measured by voltage drop between ports at indicated current through the switch.
2
IDT74FST32390
OCTAL2:1MULTIPLEXERBUSSWITCH
COMMERCIALTEMPERATURERANGE
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Test Conditions(1)
Min.
Typ.(2) Max.
Unit
∆ICC
VCC = Max.
—
0.5
1.5
mA
(3)
VIN = 3.4V
ICCD
IC
Dynamic Power Supply Current(4)
VCC = Max.
VIN = VCC
—
30
40
µA/
MHz/
Switch
Outputs Open
Enable Pin Toggling
50% Duty Cycle
VCC = Max.
Outputs Open
Enable Pin Toggling
VIN = GND
Total Power Supply Current(6)
VIN = VCC
—
—
2.4
2.7
3.2
4
mA
VIN = GND
(8 Switches Toggling)
fi = 10MHz
VIN = 3.4
VIN = GND
50% Duty Cycle
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, +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 the ICC formula. These limits are guaranteed but not tested.
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fiN)
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)
fi = Input Frequency
N = Number of Switches Toggling at fi
All currents are in milliamps and all frequencies are in megahertz.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Condition(1)
CL = 50pF
RL = 500Ω
Min.(2)
Max.
Unit
Typ.
Symbol
tPLH
Description
Data Propagation Delay
A, B to/from C(3,4)
—
—
1.25
ns
tPHL
tPZH
tPZL
Switch Turn on Delay
AEN/BEN to A, B, C
Switch Turn off Delay
AEN, BEN to A, B, C
Charge Injection(5,6)
1.5
1.5
—
—
—
7.5
5.5
—
ns
ns
tPHZ
(3)
tPLZ
|QCI|
1.5
pC
NOTES:
1. See test circuit and waveforms.
2. Minimum limits guaranteed but not tested.
3. This parameter is guaranteed by design but not tested.
4. The bus switch contributes no propagation delay other than the RC delay of the on resistance of the switch and the load capacitance. The time constant
for the switch alone is of the order of 0.25 ns for 50 pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals,
it adds very little propagation delay to the system. Propagation delay of the bus switch when used in a system is determined by the driving circuit on
the driving side of the switch and its interaction with the load on the driven side.
5. Measured at switch turn off, load = 50 pF in parallel with 10 MΩ scope probe, VIN = 0 volts.
6. Characterized parameter. Not 100% tested.
3
IDT74FST32390
OCTAL2:1MULTIPLEXERBUSSWITCH
COMMERCIALTEMPERATURERANGE
TESTCIRCUITSANDWAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
SWITCH POSITION
Test
Switch
Closed
Open
V CC
7.0V
Open Drain
Disable Low
Enable Low
All Other Tests
500Ω
500Ω
V OUT
VIN
Pulse
D.U.T.
Generator
FCT LINK
50pF
DEFINITIONS:
T
R
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
L
C
Octal link
PULSEWIDTH
SET-UP, HOLD, AND RELEASE TIMES
3V
1.5V
0V
DATA
INPUT
LOW-HIGH-LOW
tH
tSU
1.5V
PULSE
3V
1.5V
0V
TIMING
INPUT
tW
ASYNCHRONOUS CONTROL
tREM
PRESET
3V
CLEAR
ETC.
1.5V
0V
HIGH-LOW-HIGH
PULSE
1.5V
SYNCHRONOUS CONTROL
PRESET
3V
1.5V
0V
Octal link
CLEAR
CLOCK ENABLE
ETC.
tSU
tH
Octal link
PROPAGATIONDELAY
ENABLEANDDISABLETIMES
ENABLE
DISABLE
3V
3V
SAME PHASE
INPUT TRANSITION
1.5V
0V
CONTROL
INPUT
1.5V
0V
tPLH
tPHL
tPHL
tPZL
tPLZ
VOH
OUTPUT
3.5V
1.5V
3.5V
VOL
1.5V
VOL
OUTPUT
NORMALLY
LOW
SWITCH
CLOSED
tPLH
0.3V
0.3V
3V
tPZH
tPHZ
OPPOSITE PHASE
INPUT TRANSITION
1.5V
0V
VOH
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
1.5V
0V
Octal link
0V
Octal link
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
4
IDT74FST32390
OCTAL2:1MULTIPLEXERBUSSWITCH
COMMERCIALTEMPERATURERANGE
ORDERINGINFORMATION
IDT
XX
XXXX
X
FST
Temp. Range
Package
Device Type
SO
Q
PG
Small Outline IC (SO28-2)
Quarter-size Small Outline Package (SO28-8)
Thin Shrink Small Outline Package (SO28-9)
Octal 2:1 Multiplexer Bus Switch
32390
74
− 40°C to +85°C
CORPORATE HEADQUARTERS
2975StenderWay
Santa Clara, CA 95054
for SALES:
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www.idt.com*
*To search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
5
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