IDT IDT74FST1632861PAG

IDT74FST1632861
20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
20-BIT, TWO PORT BUS
SWITCH WITH RESISTOR
IDT74FST1632861
FEATURES:
DESCRIPTION:
•
•
•
•
The FST1632861 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. They generate
little or no noise of their own while providing a low resistance path for an
external driver. These devices connect input and output ports through an
n-channel FET. When the gate-to-source junction of this FET is adequately
forward-biased, the device conducts and the resistance between input and
output ports is small. With-out adequate bias on the gate-to-source junction
of the FET, the FET is turned off, therefore with no VCC applied, the device
has hot insertion capability.
The FST1632861 bus switch has a built-in 28Ω series resistor to reduce
noise which can result from reflections. This 28Ω built-in series resistor
eliminates the need for an external terminating resistor.
Bus switches provide zero delay paths
Ω
Low switch on-resistance: 28Ω
TTL-compatible input and output levels
ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• Hot insertion capability
• Very low power dissipation
• Available in SSOP, TSSOP, and TVSOP packages
FUNCTIONAL BLOCK DIAGRAM
1OE
2OE
A0
B0
A10
B10
A1
B1
A11
B11
A2
B2
A12
B12
A3
B3
A13
B13
A4
B4
A14
B14
A5
B5
A15
B15
A6
B6
A16
B16
A7
B7
A17
B17
A8
B8
A18
B18
A9
B9
A19
B19
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
JUNE 2006
1
© 2006 Integrated Device Technology, Inc.
DSC-5582/4
IDT74FST1632861
20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC
1
ABSOLUTE MAXIMUM RATINGS(1)
48
Symbol
Description
Max
Unit
VTERM(2)
Terminal Voltage with Respect to GND
–0.5 to +7
V
VCC
TSTG
Storage Temperature
–65 to +150
°C
IOUT
Maximum Continuous Channel Current
128
mA
A0
2
47
1OE
A1
3
46
B0
A2
4
45
B1
A3
5
44
B2
A4
6
43
B3
A5
7
42
B4
A6
8
41
B5
A7
9
40
B6
A8
10
39
B7
A9
11
38
B8
GND
12
37
B9
NC
13
36
Vcc
A10
14
35
2OE
A11
15
34
B10
A12
16
33
B11
A13
17
32
B12
A14
18
31
B13
A15
19
30
B14
A16
20
29
B15
A17
21
28
B16
A18
22
27
B17
A19
23
26
B18
GND
24
25
B19
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.
2. Vcc, Control, and Switch terminals.
CAPACITANCE(1)
Symbol
Parameter
CIN
Control Input Capacitance
CI/O
Switch Input/Output Capacitance
Conditions(2)
Typ.
Unit
6
pF
Switch Off
12
pF
NOTES:
1. Capacitance is characterized but not tested.
2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V.
PIN DESCRIPTION
Pin Names
xOE
Ax
Bx
Description
Output Enable Inputs (Active LOW)
A Port Bits
B Port Bits
FUNCTION TABLE(1)
Inputs
SSOP/ TSSOP/ TVSOP
TOP VIEW
xOE
Outputs
L
Connect A to B
H
Disconnect A from B
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
2
IDT74FST1632861
20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 5.0V ± 10%
Symbol
Test Conditions(1)
Parameter
Min.
Typ.(2)
Max.
Unit
VIH
Control Input HIGH Voltage
Guaranteed Logic HIGH for Control Inputs
2
—
—
V
VIL
Control Input LOW Voltage
Guaranteed Logic LOW for Control Inputs
—
—
0.8
V
IIH
Control Input HIGH Current
VCC = Max.
VI = VCC
—
—
±1
µA
IIL
Control Input LOW Current
VI = GND
—
—
±1
—
—
±1
—
—
±1
IOZH
Current During
VCC = Max., VO = 0 to 5V
µA
IOZL
Bus Switch Disconnect
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18mA
—
–0.7
–1.2
V
IOFF
Switch Power Off Leakage
VCC = 0V, VIN or VO ≤ 5.5V
—
—
±1
µA
ICC
Quiescent Power Supply Current
VCC = Max., VIN = GND or VCC
—
0.1
3
µA
BUS SWITCH IMPEDANCE OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ±10%
Symbol
RON
IOS
Parameter
Switch CONNECT Resistance,
(2)
A to B
Short Circuit Current, A to B
(3)
Test Conditions
VIN = 0V, ION = 48mA
VIN = 2.4V, ION = 15mA
Min.
20
20
Typ.
28
35
A(B) = 0V, B(A) = Vcc
100
—
NOTES:
1. Typical values are at Vcc = 5.0V, +25°C ambient.
2. The voltage drop between the indicated ports divided by the current through the switch.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
3
(1)
Max.
40
48
Unit
Ω
—
mA
IDT74FST1632861
20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Test Conditions(1)
Min.
Typ.(2)
Max.
Unit
—
0.5
1.5
mA
VIN = VCC
VIN = GND
—
30
400
µA/
MHz/
Select
VCC = Max.
Outputs Open
VIN = VCC
VIN = GND
—
0.6
8
mA
Two Enable Pins Toggling
fi = 10MHz
VIN = 3.4V
VIN = GND
—
0.7
9.5
Symbol
Parameter
ΔICC
Quiescent Power Supply Current
TTL Inputs HIGH
VCC = Max.
VIN = 3.4V(3)
ICCD
Dynamic Power Supply
Current(4,5)
VCC = Max.
Outputs Open
Select Input Togging
50% Duty Cycle
Total Power Supply Current(6)
IC
50% Duty Cycle
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. TA = –40°C to +85°C
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. Switch inputs do not contribute to ΔICC.
4. This parameter represents the current required to switch the internal capacitance of the control inputs at the specified frequency.
Switch inputs generate no significant power supply currents as they transition. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. CPD = ICCD/VCC
CPD = Power Dissipation Capacitance
6. IC = IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ΔICC DHNT + ICCD (fiN)
ICC = Quiescent Current
ΔICC = 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 = Control Input Frequency
N = Number of Control Inputs Toggling at fi
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 10%
VCC = 5V ± 10%
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
|QCI|
Description(1)
Data Propagation Delay
A to B, Y to B(2)
Switch CONNECT Delay
xOE to A or B
Switch DISCONNECT Delay
xOE to A or B
Charge Injection During Switch DISCONNECT,
xOE to A or B(3)
VCC = 4V
Min.
Typ.
Max.
Max.
Unit
—
—
0.25
0.25
ns
1.5
—
6.5
7
ns
1.5
—
7
7
ns
—
1.5
—
—
pC
NOTES:
1. See test circuits and waveforms.
2. The bus switch contributes no Propagation Delay other than the RC Delay of the load interacting with the RC of the switch.
3. |QCI| is the charge injection for a single switch DISCONNECT and applies to either single switches or multiplexers. |QDCI| is the charge injection for a multiplexer as the multiplexed
port switches from one path to another. Charge injection is reduced because the injection from the DISCONNECT of the first path is compensated by the CONNECT of the
second path.
4
IDT74FST1632861
20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
VCC
7.0V
500Ω
tPLH
V OUT
VIN
Pulse
Generator
tPHL
OUTPUT
D.U.T.
tPLH
50pF
RT
3V
1.5V
0V
VOH
1.5V
VOL
SAME PHASE
INPUT TRANSITION
500Ω
tPHL
3V
1.5V
0V
OPPOSITE PHASE
INPUT TRANSITION
CL
Propagation Delay
Test Circuits for All Outputs
DATA
INPUT
SWITCH POSITION
Switch
TIMING
INPUT
Open Drain
Disable Low
Enable Low
Closed
ASYNCHRONOUS
CONTROL
All Other Tests
Open
tREM
SYNCHRONOUS
CONTROL
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
tH
tSU
Test
3V
1.5V
0V
3V
1.5V
0V
tSU
3V
1.5V
0V
3V
1.5V
0V
tH
Set-up, Hold, and Release Times
VCC
ENABLE
1 MHz
Signal
Generator
Enable/Select(1)
D.U.T.
Switch
Out
VOUT(3)
3V
1.5V
0V
CONTROL
INPUT
Switch In
(2)
Switch In (MUX)
DISABLE
tPZL
CL =
50pF
OUTPUT
NORMALLY
LOW
Charge Injection
OUTPUT
NORMALLY
HIGH
NOTES:
1. Select is used with multiplexers for measuring IQDCII during multiplexer select. During
all other tests Enable is used.
2. Used with multiplexers to measure IQDCII only.
3. Charge Injection = ΔVOUT CL, with Enable toggling for IQCII or Select toggling for IQDCII.
ΔVOUT is the change in VOUT and is measured with a 10MΩ probe.
SWITCH
CLOSED
tPZH
SWITCH
OPEN
tPLZ
3.5V
3.5V
1.5V
0.3V
VOL
tPHZ
0.3V
1.5V
0V
VOH
0V
Enable and Disable Times
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.
LOW-HIGH-LOW
PULSE
1.5V
tW
HIGH-LOW-HIGH
PULSE
1.5V
Pulse Width
5
IDT74FST1632861
20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
FST
XX
Temp. Range
XXX
Family
XXX
Device Type
XX
Package
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San Jose, CA 95138
PV
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Shrink Small Outline Package
SSOP - Green
Thin Shrink Small Outline Package
TSSOP - Green
Thin Very Small Outline Package
TVSOP - Green
2861
20-Bit Flow Through Switch with Resistor
163
Double-Density Bus Switch
74
–40°C to +85°C
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