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
C
IN
C
I/O
Parameter
Control Input Capacitance
Switch Input/Output Capacitance
Switch Off
Conditions
(2)
Typ.
4
8
Unit
pF
pF
NOTES:
1. Capacitance is characterized but not tested.
2. T
A
= 25°C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V.
PIN DESCRIPTION
Pin Names
A
0
- A
19
B
0
- B
19
BEA
BEB
BEC
BED
I/O
I/O
I/O
I
I
I
I
Bus A
Bus B
Enable, 0-4
Enable, 15-19
Enable, 5-9
Enable, 10-14
Description
FUNCTION TABLE
(1)
BEA
H
L
H
L
BEC
BEB
H
H
L
L
BED
H
H
L
L
B
0
- B
4
Z
A
0
- A
4
Z
A
0
- A
4
B
0
- B
4
Z
A
5
- A
9
Z
A
5
- A
9
B
15
- B
19
Z
Z
A
15
- A
19
A
15
- A
19
B
15
- B
19
Z
Z
A
10
- A
14
A
10
- A
14
Description
Disconnect
Connect
Connect
Connect
Description
Disconnect
Connect
Connect
Connect
TSSOP
TOP VIEW
H
L
H
L
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
2
IDT74FST32XL2384
20-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
CC
= 5.0V ± 10%
Symbol
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
I
OS
V
IK
R
ON
I
OFF
I
CC
Parameter
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output Current
(3-State Output Pins)
Short Circuit Current
Clamp Diode Voltage
Switch On Resistance
(4)
Input/Output Power Off Leakage
Quiescent Power Supply Current
Vcc = Max., V
O
= GND
(3)
V
CC
= Min., I
IN
= –18mA
Vcc = Min., V
IN
= 0V, I
ON
= 30mA
Vcc = Min., V
IN
= 2.4V, I
ON
= 15mA
V
CC
= 0V, V
IN
or V
O
≤
4.5V
V
CC
= Max., V
I
= GND or V
CC
V
CC
= Max.
Test Conditions
(1)
Guaranteed Logic HIGH for Control Inputs
Guaranteed Logic LOW for Control Inputs
V
CC
= Max.
V
I
= V
CC
V
I
= GND
V
O
= V
CC
V
O
= GND
Min.
2
—
—
—
—
—
—
—
20
20
—
—
Typ.
(2)
—
—
—
—
—
—
300
–0.7
28
35
—
0.1
Max.
—
0.8
±1
±1
±1
±1
—
–1.2
40
48
±1
3
mA
V
Ω
µA
µA
µA
Unit
V
V
µA
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 shorted 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.
POWER SUPPLY CHARACTERISTICS
Symbol
ΔI
CC
I
CCD
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply
Current
(4,5)
Total Power Supply Current
(6)
V
CC
= Max.
V
IN
= 3.4V
(3)
V
CC
= Max., Outputs Open
Enable Pin Toggling
50% Duty Cycle
V
CC
= Max., Outputs Open
Enable Pins Toggling
(20 Switches Toggling)
f
i
= 10MHz
50% Duty Cycle
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
Test Conditions
(1)
Min.
—
—
Typ.
(2)
0.5
30
Max.
1.5
40
Unit
mA
µA/
MHz/
Switch
mA
I
C
—
6
8
—
7
11
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 V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V). All other inputs at V
CC
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. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
ΔI
CC
D
H
N
T
+ I
CCD
(f
i
N)
I
CC
= Quiescent Current
ΔI
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
i
= Control Input Frequency
N = Number of Control Inputs Toggling at f
i
All currents are in milliamps and all frequencies are in megahertz.
3
IDT74FST32XL2384
20-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= -40°C to +85°C, V
CC
= 5.0V ± 10%
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
|Q
CI
|
Description
(1)
Data Propagation Delay
Ax to Bx, Bx to Ax
(3,4)
Switch Turn On Delay
BEx
to Ax, Bx
Switch Turn Off Delay
BEx
to Ax, Bx
(3)
Charge Injection
(5,6)
Condition
C
L
= 50pF
R
L
= 500Ω
Min.
—
1.5
1.5
—
Typ.
—
—
—
1.5
Max.
1.25
7.5
5.5
—
Unit
ns
ns
ns
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 2.5ns for 50pF 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 on 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, V
IN
= 0.0 volts.
6. Characterized parameter. Not 100% tested.
4
IDT74FST32XL2384
20-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V
CC
500Ω
V
IN
Pulse
Generator
R
T
D.U.T
.
V
OUT
7.0V
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
All Other Tests
Switch
Closed
Open
50pF
C
L
500Ω
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
Octal Link
Test Circuits for All Outputs
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
t
SU
t
H
t
REM
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
Octal Link
LOW-HIGH-LOW
PULSE
t
W
HIGH-LOW-HIGH
PULSE
1.5V
1.5V
t
SU
t
H
Pulse Width
Octal Link
Set-up, Hold, and Release Times
ENABLE
SAME PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
OPPOSITE PHASE
INPUT TRANSITION
t
PHL
t
PHL
3V
1.5V
0V
V
OH
1.5V
V
OL
3V
1.5V
0V
CONTROL
INPUT
t
PZL
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
CLOSED
t
PZH
SWITCH
OPEN
1.5V
0V
3.5V
1.5V
t
PHZ
DISABLE
3V
1.5V
0V
3.5V
0.3V
0.3V
V
OL
V
OH
0V
Octal Link
t
PLZ
Octal Link
Propagation Delay
Enable and Disable Times
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
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