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.
6
12
Unit
pF
pF
NOTES:
1. Capacitance is characterized but not tested.
2. T
A
= 25°C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V.
B
10
B
11
B
12
B
13
B
14
B
15
B
16
B
17
B
18
B
19
PIN DESCRIPTION
Pin Names
Ax
Bx
xOE
Description
A Port Bits
B Port Bits
Output Enable Inputs (Active LOW)
FUNCTION TABLE
(1)
Inputs
xOE
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Outputs
Connect A to B
Disconnect A from B
2
IDT74FST163861
20-BIT, TWO PORT 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
V
IK
I
OFF
I
CC
Parameter
Control Input HIGH Voltage
Control Input LOW Voltage
Control Input HIGH Current
Control Input LOW Current
Current During
Bus Switch Disconnect
Clamp Diode Voltage
Switch Power Off Leakage
Quiescent Power Supply Current
V
CC
= Min., I
IN
= –18mA
V
CC
= 0V, V
IN
or V
O
≤
5.5V
V
CC
= Max., V
IN
= GND or V
CC
V
CC
= Max., V
O
= 0 to 5V
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
Min.
2
—
—
—
—
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
–0.7
—
0.1
Max.
—
0.8
±1
±1
±1
±1
–1.2
±1
3
V
µA
µA
µA
Unit
V
V
µA
BUS SWITCH IMPEDANCE OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= -40°C to +85°C, V
CC
= 5.0V ±10%
Symbol
R
ON
I
OS
Parameter
Switch On Resistance, A to B
(2)
Short Circuit Current, A to B
(3)
Test Conditions
V
IN
= 0V, I
ON
= 12mA
V
IN
= 2.4V, I
ON
= 8mA
A(B) = 0V, B(A) = Vcc
Min.
—
—
100
Typ.
5
10
—
(1)
Max.
7
15
—
Unit
Ω
mA
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
IDT74FST163861
20-BIT, TWO PORT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
∆I
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
Two Enable Pins 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
400
Unit
mA
µA/
MHz/
Enable
mA
I
C
—
—
0.6
0.7
8
9.5
NOTES:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. T
A
= –40°C to +85°C
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. Switch inputs do not contribute to
∆I
CC.
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. C
PD
= I
CCD
/V
CC
C
PD
= Power Dissipation Capacitance
6. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
i
N)
I
CC
= Quiescent Current
∆I
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
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
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)
V
CC
= 5V ± 10%
Min.
—
1.5
1.5
—
Typ.
—
—
—
1.5
Max.
0.25
6.5
7
—
V
CC
= 4V
Max.
0.25
7
7
—
Unit
ns
ns
ns
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. |Q
CI
| 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
IDT74FST163861
20-BIT, TWO PORT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V
CC
500Ω
V
IN
Pulse
Generator
R
T
D.U.T.
50pF
C
L
500Ω
OPPOSITE PHASE
INPUT TRANSITION
V
OUT
OUTPUT
t
PLH
t
PHL
7.0V
SAME PHASE
INPUT TRANSITION
t
PLH
t
PHL
3V
1.5V
0V
V
OH
1.5V
V
OL
3V
1.5V
0V
Propagation Delay
Test Circuits for All Outputs
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
All Other Tests
Switch
Closed
Open
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS
CONTROL
SYNCHRONOUS
CONTROL
t
SU
t
H
t
REM
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
t
SU
t
H
Set-up, Hold, and Release Times
V
CC
ENABLE
1 MHz
Signal
Generator
Enable/Select
Switch In
Switch In
(MUX)
(2)
(1)
DISABLE
3V
1.5V
0V
3.5V
0.3V
t
PHZ
0.3V
1.5V
0V
V
OH
0V
V
OL
Switch
D.U.T. Out
V
OUT
(3)
CONTROL
INPUT
C
L
=
50pF
t
PZL
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
CLOSED
t
PZH
SWITCH
OPEN
3.5V
1.5V
t
PLZ
Charge Injection
NOTES:
1. Select is used with multiplexers for measuring IQ
DCI
I during multiplexer select. During
all other tests Enable is used.
2. Used with multiplexers to measure IQ
DCI
I only.
3. Charge Injection =
∆V
OUT
C
L
, with Enable toggling for IQ
CI
I or Select toggling for IQ
DCI
I.
∆V
OUT
is the change in V
OUT
and is measured with a 10MΩ probe.
Enable and Disable Times
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
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