IDT74FST163244
16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
16-BIT BUS SWITCH
IDT74FST163244
FEATURES:
DESCRIPTION:
•
•
•
•
The FST163244 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. Without 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 low on-resistance and simplicity of the connection between input and
output ports reduces the delay in this path to close to zero.
The FST163244 is pin-compatible with and functionally similar to the
FCT16244T.
Bus switches provide zero delay paths
Low switch on-resistance
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 TSSOP package
FUNCTIONAL BLOCK DIAGRAM
3 OE
1 OE
1A 1
1B 1
3A 1
3B 1
1A 2
1B 2
3A 2
3B 2
1A 3
1B 3
3A 3
3B 3
1A 4
1B 4
3A 4
3B 4
2 OE
4 OE
2A 1
2B 1
4A 1
4B 1
2A 2
2B 2
4A 2
4B 2
2A 3
2B 3
4A 3
4B 3
2A 4
2B 4
4A 4
4B 4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
February 19, 2009
1
© 2006 Integrated Device Technology, Inc.
DSC-3615/5
IDT74FST163244
16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
1OE
1
48
2OE
1B 1
2
47
1A 1
1B 2
3
46
1A 2
GND
4
45
GND
1B 3
5
44
1A 3
1B 4
6
43
1A 4
VCC
7
42
VCC
2B 1
8
41
2A 1
2B 2
9
40
2A 2
10
39
GND
GND
2B 3
11
38
2A 3
2B 4
12
37
2A 4
3B 1
13
36
3A 1
3B 2
14
35
3A 2
GND
15
34
GND
3B 3
16
33
3A 3
3B 4
17
32
3A 4
VCC
18
31
VCC
4B 1
19
30
4A 1
4B 2
20
29
4A 2
GND
21
28
GND
4B 3
22
27
4A 3
4B 4
23
26
4A 4
4OE
24
25
3OE
Symbol
Description
Max
Unit
VTERM(2)
Terminal Voltage with Respect to GND
–0.5 to +7
V
TSTG
Storage Temperature
–65 to +150
°C
IOUT
Maximum Continuous Channel Current
128
mA
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
Description
xOE
xAx
xBx
Output Enable Inputs (Active LOW)
A Port Bits
B Port Bits
FUNCTION TABLE(1)
Inputs
TSSOP
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
IDT74FST163244
16-BIT BUS SWITCH
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 On Resistance, A to B(2)
Short Circuit Current, A to B(3)
Test Conditions
Vcc = Min., VIN = 0V, ION = 12mA
Vcc = Min., VIN = 2.4V, ION = 8mA
A(B) = 0V, B(A) = Vcc
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
Min.
—
—
100
Typ.
5
10
—
(1)
Max.
7
15
—
Unit
Ω
mA
IDT74FST163244
16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Test Conditions(1)
Min.
Typ.(2)
Max.
Unit
—
0.5
1.5
mA
VIN = VCC
VIN = GND
—
120
160
µA/
MHz/
Enable
VCC = Max.
One Enable Pin Toggling
fi = 10MHz
50% Duty Cycle
VCC = Max.
Four Enable Pins Toggling
VIN = VCC
VIN = GND
VIN = VCC
VIN = 3.4V
VIN = VCC
VIN = GND
—
1.2
1.6
mA
—
1.5
2.4
—
4.8
6.4
fi = 10MHz
50% Duty Cycle
VIN = VCC
VIN = 3.4V
—
5.8
9.4
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.
One Enable Pin Toggling
50% Duty Cycle
Total Power Supply Current(6)
IC
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, B to A(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
—
5.6
—
ns
1.5
—
5.2
—
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. Charge injection is reduced because the injection
from the DISCONNECT of the first path is compensated by the CONNECT of the second path.
4
IDT74FST163244
16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V CC
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
Test
Switch
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
TIMING
INPUT
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
(1)
Enable/Select
Switch In
Switch
D.U.T. Out
Switch In
(MUX) (2)
VOUT
DISABLE
(3)
3V
CONTROL
INPUT
tPLZ
tPZL
CL =
50pF
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
Charge Injection
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
1.5V
0V
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
IDT74FST163244
16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
XX
FST
Temp. Range
XXX
Family
XXX
Device Type
XX
Package
CORPORATE HEADQUARTERS
6024 Silver Creek Valley Road
San Jose, CA 95138
PA
PAG
Thin Shrink Small Outline Package
TSSOP - Green
244
16-Bit Flow Through Switch
163
Double-Density Bus Switch
74
-40°C to +85°C
for SALES:
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
6
for Tech Support:
logichelp@idt.com
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