IDT IDT74FST163211

IDT74FST163211
24-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
24-BIT BUS SWITCH
IDT74FST163211
DESCRIPTION:
FEATURES:
The FST163211 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
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 gateto-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.
•
•
•
•
Bus switches provide zero delay paths
Ω
Low switch on-resistance; 5Ω
TTL-compatible input and output levels
ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• Available in TSSOP package
FUNCTIONAL BLOCK DIAGRAM
1A1
1B1
1A12
1B12
2A1
2B1
2A12
2B12
1OE
2OE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
JANUARY 2004
1
© 2004 Integrated Device Technology, Inc.
DSC-3685/3
IDT74FST163211
24-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
NC
1
56
1OE
1A 1
2
55
2OE
1A 2
3
54
1B 1
1A 3
4
53
1B 2
1A 4
5
52
1B 3
1A 5
6
51
1B 4
1A 6
7
50
1B 5
GND
8
49
GND
1A 7
9
48
1B 6
1A 8
10
47
1B 7
1A 9
11
46
1B 8
1A10
12
45
1B 9
1A11
13
44
1B10
1A12
14
43
1B11
2A 1
15
42
1B12
2A 2
16
41
2B 1
VCC
17
40
2B 2
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
Conditions(2)
Parameter
CIN
Control Input Capacitance
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.
PIN DESCRIPTION
Pin Names
I/O
xAx
xBx
xOE
I/O
I/O
I
Description
Bus A
Bus B
Switch Enable
2A 3
18
39
2B 3
GND
19
38
GND
2A 4
20
37
2B 4
2A 5
21
36
2B 5
2A 6
22
35
2B 6
2A 7
23
34
2B 7
2A 8
24
33
2A 9
25
32
2B 9
1 OE
2OE
2A10
26
31
2B10
L
L
1A
= 1B
2A11
27
30
2B11
L
H
1A
= 1B
2A12
28
29
2B12
H
L
Z
H
H
Z
FUNCTION TABLE(1)
2B 8
1A, 1B
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
TSSOP
TOP VIEW
2
2A, 2B
2A
2A
Description
= 2B
Connect
Z
Bank 1 Connect
= 2B
Bank 2 Connect
Z
Disconnect
Typ.
Unit
6
pF
12
pF
IDT74FST163211
24-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
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
VCC = Max., VO = 0 to 5V
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
Parameter
RON
Switch On Resistance(2)
IOS
Short Circuit Current, A to B(3)
Test Conditions
Vcc = Min., VIN = 0V, ION = 64mA
Vcc = Min., VIN = 0V, ION = 30mA
Vcc = Min., VIN = 2.4V, ION = 15mA
Vcc = Max., Vo =GND
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.
—
—
—
—
(1)
Typ.
5
5
—
300
Max.
6
7
15
—
Unit
Ω
mA
IDT74FST163211
24-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
—
240
320
µA/
MHz/
Switch
VCC = Max.
One Enable Pin Toggling
fi = 10MHz
50% Duty Cycle
VIN = VCC
VIN = GND
VIN = 3.4V
VIN = GND
—
2.4
3.2
mA
—
2.7
4
VCC = Max.
Two Enable Pins Toggling
fi = 10MHz
50% Duty Cycle
VIN = VCC
VIN = GND
VIN = 3.4V
VIN = GND
—
4.8
6.4
—
5.4
8
Symbol
Parameter
∆ICC
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 ∆ICC.
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 + ∆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 = 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
—
6.5
7
ns
1.5
—
5.5
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
IDT74FST163211
24-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V CC
7.0V
500Ω
tPLH
V OUT
VIN
Pulse
Generator
tPHL
VOH
1.5V
VOL
OUTPUT
D.U.T.
tPLH
50pF
RT
3V
1.5V
0V
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
1.5V
tPZL
CL =
50pF
OUTPUT
NORMALLY
LOW
SWITCH
CLOSED
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 = ∆VOUT CL, with Enable toggling for IQCII or Select toggling for IQDCII.
∆VOUT is the change in VOUT and is measured with a 10MΩ probe.
SWITCH
OPEN
3.5V
3.5V
1.5V
tPZH
Charge Injection
0V
tPLZ
0.3V
VOL
tPHZ
0.3V
VOH
1.5V
0V
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
IDT74FST163211
24-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XX
FST
Temp. Range
XXX
Family
XXX
Device Type
X
Package
PA
PAG
Thin Shrink Small Outline Package
TSSOP - Green
211
24-Bit Bus Switch
163
Double-Density Bus Switch
74
–40°C to +85°C
DATA SHEET DOCUMENT HISTORY
5/24/2002
Removed TVSOP package
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6
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