ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
Available in SSOP, TSSOP, and TVSOP Packages
DESCRIPTION:
The FST163292 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 V
CC
applied, the device
has not 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 FST163292 provides four 12-bit TTL-compatible ports that support
2 way bus exchange. The S
0
pin controls the bus exchange and switch
enable functions.
FUNCTIONAL BLOCK DIAGRAM
1 of 12 Channels
1
A
1
1
B
1
1
A
2
1
B
2
500
Ω
FLOW CONTROL
S
0
INDUSTRIAL TEMPERATURE RANGE
1
c /-
1999
Integrated Device Technology, Inc.
FEBRUARY 2000
DSC-5866/-
IDT74FST163292
24-BIT BUS EXCHANGE SWITCH WITH BUS TERMINATOR
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
S
0
1
A
1
ABSOLUTE MAXIMUM RATINGS
(1)
56
55
54
53
52
51
50
49
48
47
46
45
44
Symbol
V
TERM(2)
Rating
Terminal Voltage with Respect to GND
Storage Temperature
Maximum Continuous Channel Current
Max.
–0.5 to +7
–65 to +150
128
Unit
V
°C
mA
FST LINK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
SO56-1
SO56-2
SO56-3
NC
NC
1
B
1
T
STG
I
OUT
NC
2
A
1
1
B
2
2
B
1
2
B
2
3
B
1
NC
3
A
1
NC
GND
4
A
1
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.
GND
3
B
2
4
B
1
CAPACITANCE
(1)
Symbol
C
IN
C
OFF
C
ON
Parameter
Control Input Capacitance
Switch Input/Output
Capacitance, Switch Off
A/B Capacitance
Switch On
Conditions
(2)
V
IN
= 0V
V
IN
= 0V
V
IN
= 0V
Max. Unit
8
pF
20
40
pF
pF
NC
5
A
1
4
B
2
5
B
1
5
B
2
6
B
1
6
B
2
7
B
1
7
B
2
8
B
1
NC
6
A
1
NC
7
A
1
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
NOTES:
1. Capacitance is characterized but not tested.
2. T
A
= 25°C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V
NC
V
CC
8
A
1
PIN DESCRIPTION
Pin Names
A
1,
A
2
B
1,
B
2
S
0
I/O
I/O
I
Description
Buses A
1,
A
2
, B
1,
B
2
Control Pin for Mux and Switch
Enable Functions
GND
NC
9
A
1
GND
8
B
2
9
B
1
9
B
2
10
B
1
10
B
2
11
B
1
11
B
2
12
B
1
12
B
2
NC
10
A
1
FUNCTION TABLE
(1)
S
0
L
H
A
1
B
1
B
2
A
2
B
2
B
1
Function
A
1
to B
1
, A
2
to B
2
A
1
to B
2
, A
2
to B
1
NC
11
A
1
NC
12
A
1
NOTE:
1. H = HIGH Voltage level
L = LOW Voltage Level
NC
SSOP/ TSSOP/ TVSOP
TOP VIEW
2
IDT74FST163292
24-BIT BUS EXCHANGE SWITCH WITH BUS TERMINATOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Conditions: 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
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.
(1)
—
—
—
—
—
—
–0.7
—
0.1
Max.
—
0.8
±1
±1
±1
±1
–1.2
±1
3
V
µA
µA
FST LINK
Unit
V
V
µA
µA
BUS SWITCH IMPEDANCE OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Conditions: T
A
= -40°C to +85°C, V
CC
= 5.0V ±10%
Symbol
R
ON
Parameter
Switch CONNECT Resistance
(2)
Test Conditions
V
CC
= Min., V
IN
= 0V, I
ON
= 64mA
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
I
OS
Short Circuit Current
(3)
V
CC
= Max., V
O
= GND
Min.
—
—
—
—
Typ.
(1)
5
10
12
300
Max.
7
12
15
—
Unit
Ω
Ω
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
IDT74FST163292
24-BIT BUS EXCHANGE SWITCH WITH BUS TERMINATOR
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)
Test Conditions
(1)
V
CC
= Max.
V
IN
= 3.4V
(3)
V
CC
= Max.
Outputs Open
Select Pin Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
Select Pin Toggling
(24 Switches Toggling)
fi = 10MHz
50% Duty Cycle
Min.
—
V
IN
= V
CC
V
IN
= GND
—
Typ.
(2)
0.5
30
Max.
1.5
40
Unit
mA
µ A/
MHz/
Select
mA
I
C
Total Power Supply Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4
V
IN
= GND
—
7.2
9.6
—
7.7
11.1
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:
Operating Conditions: T
A
= -40°C to +85°C, V
CC
= 5.0V ±10%
V
CC
= 5V ±10%
Symbol
t
PLH
t
PHL
t
BX
t
PZH
t
PZL
t
PHZ
t
PLZ
|Q
DCI
|
t
M
Description
(1)
Data Propagation Delay
A to B, B to A
(2)
Switch Multiplex Delay
S to A, B
Switch Turn on Delay
S to A, B
Switch Turn off Delay
S to A, B
Charge Injection During Switch
Exchange S
0
to A or B
(3)
Make Before Brake Time
Min.
—
1.5
1.5
1.5
—
0
Typ.
—
—
—
—
0.5
Max.
0.25
6.5
6.5
7
—
2
V
CC
= 4V
Max.
0.25
7
7
7
—
2
Unit
ns
ns
ns
ns
pC
ns
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.
|Q
DCI
| 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
IDT74FST163292
24-BIT BUS EXCHANGE SWITCH WITH BUS TERMINATOR
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
V
CC
500
Ω
V
IN
Pulse
Generator
D.U.T.
50pF
R
T
C
L
PROPAGATION DELAY
7.0V
SAME PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
t
PH L
t
PH L
3V
1.5V
0V
V
OH
1.5V
V
OL
3V
1.5V
0V
V
O UT
500
Ω
OPPOSITE PHASE
INPUT TRANSITION
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
All Other Tests
Open
FCT LINK
SET-UP, HOLD, AND RELEASE TIMES
Switch
Closed
DATA
INPUT
t
SU
TIMING
INPUT
ASYNCHRONOUS
CONTROL
SYNCHRONO US
CONTROL
t
REM
t
H
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
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
CHARGE INJECTION
V
CC
ENABLE AND DISABLE TIMES
ENABLE
DISABLE
3V
V
OUT
(3)
1 MHz
Signal
G enerator
Enable/Select
Sw itch In
(1)
D.U .T.
(2)
Sw itch
O ut
CONTROL
INPUT
t
PZL
OUTPUT
NORMALLY
LOW
SW ITCH
CLOSED
t
PZH
OUTPUT
NORMALLY
HIGH
SW ITCH
OPEN
3.5V
1.5V
0.3V
t
PH Z
0.3V
1.5V
0V
t
PLZ
1.5V
0V
3.5V
V
OL
V
OH
Sw itch In (M U X)
C
L
=
50pF
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.
0V
PULSE WIDTH
LOW -HIGH-LOW
PULSE
t
W
HIGH-LOW -HIGH
PULSE
1.5V
1.5V
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-
模拟与混合信号
