2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS EXCHANGE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
®
PRODUCTS
2.5V/3.3V 8-BIT HIGH BANDWIDTH
BUS EXCHANGE BUS SWITCH
FEATURES:
DESCRIPTION:
IDTQS3VH383
• N channel FET switches with no parasitic diode to Vcc
−
Isolation under power-off conditions
−
No DC path to Vcc or GND
−
5V tolerant in OFF and ON state
• 5V tolerant I/Os
• Low R
ON
- 4Ω typical
Ω
• Flat R
ON
characteristics over operating range
• Rail-to-rail switching 0 - 5V
• Bidirectional dataflow with near-zero delay: no added ground
bounce
• Excellent R
ON
matching between channels
• Vcc operation: 2.3V to 3.6V
• High bandwidth - up to 500 MHz
• LVTTL-compatible control Inputs
• Undershoot Clamp Diodes on all switch and control Inputs
• Low I/O capacitance, 4pF typical
• Available in QSOP, SOIC, and TSSOP packages
The QS3VH383 Bus Exchange HotSwitch with 10-bits is a high bandwidth
bus switch. The QS3VH383 has very low ON resistance, resulting in under
250ps propagation delay through the switch. The Bus Enable (BE) signal turns
the switches on. The Bus Exchange (BX) signal provides nibble swap of the
AB and CD signal pairs. This exchange configuration allows byte swapping
of buses. In the OFF and ON states, the switches are 5V-tolerant. In the OFF
state, the switches offer very high impedence at the terminals.
The combination of near-zero propagation delay, the lack of additional
ground bounce noise, high OFF impedance, and over-voltage tolerance
makes the QS3VH383 ideal for high performance communications applications.
The QS3VH383 is characterized for operation from -40°C to +85°C.
APPLICATIONS:
•
•
•
•
•
Hot-swapping
10/100 Base-T, Ethernet LAN switch
Low distortion analog switch
Replaces mechanical relay
ATM 25/155 switching
FUNCTIONAL BLOCK DIAGRAM
A0
C0
B0
D0
A4
C4
B4
D4
BX
BE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2002 Integrated Device Technology, Inc.
APRIL 2002
DSC-5878/4
IDTQS3VH383
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS EXCHANGE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
BE
C0
A0
B0
D0
C1
A1
B1
D1
C2
A2
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
D4
B4
A4
C4
D3
B3
A3
C3
D2
B2
BX
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
V
TERM(3)
V
AC
I
OUT
T
STG
Description
Supply Voltage to Ground
DC Switch Voltage V
S
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤20ns)
DC Output Current (max. current/pin)
Storage Temperature
Max.
– 0.5 to 4.6
– 0.5 to 5.5
– 0.5 to 5.5
–3
120
-65 to +150
Unit
V
V
V
V
mA
°
C
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. V
CC
terminals.
3. All terminals except V
CC
.
CAPACITANCE
Symbol
C
IN
C
I/O
C
I/O
Parameter
(1)
Control Inputs
(T
A
= +25 C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V)
Typ.
3
7
14
Max.
5
11
22
Unit
pF
pF
pF
o
Quickswitch Channels (Switch OFF)
Quickswitch Channels (Switch ON)
QSOP/ SOIC/ TSSOP
TOP VIEW
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
A
0-
A
4
, B
0-
B
4
C
0-4
, D
0-
D
4
BE
BX
I/O
I/O
I/O
I
I
Description
Buses A and B
Buses C and D
Bus Switch Enable
Bus Exchange
FUNCTION TABLE
(1)
BE
H
L
L
BX
X
L
H
A
0-
A
4
Z
C
0-
C
4
D
0-
D
4
B
0-
B
4
Z
D
0-
D
4
C
0-
C
4
Function
Disconnect
Connect
Exchange
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
2
IDTQS3VH383
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS EXCHANGE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
(1)
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
CC
= 3.3V ± 0.3V
Symbol
V
IH
V
IL
I
IN
I
OZ
I
OFF
R
ON
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Leakage Current (Control Inputs)
Off-State Current (Hi-Z)
Data Input/Output Power Off Leakage
Switch ON Resistance
Test Conditions
Guaranteed Logic HIGH
for Control Inputs
Guaranteed Logic HIGH
for Control Inputs
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
Min.
1.7
2
—
—
—
—
—
I
ON
= 30mA
I
ON
= 15mA
I
ON
= 30mA
I
ON
= 15mA
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
—
6
7
4
5
Max.
—
—
0.7
0.8
±1
±1
±1
8
9
6
8
Ω
µA
µA
µA
V
Unit
V
≤
V
CC
0V
≤
V
OUT
≤
5V, Switches OFF
V
IN
or V
OUT
0V to 5V, V
CC
= 0V
V
CC
= 2.3V
V
CC
= 3V
V
IN
= 0V
V
IN
= 0V
V
IN
= 2.4V
(Typ. at V
CC
= 2.5V) V
IN
= 1.7V
0V
≤
V
IN
NOTE:
1. Typical values are at V
CC
= 3.3V and T
A
= 25°C.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 3.3V
16
R
ON
(ohms)
14
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
V
IN
(Volts)
3
IDTQS3VH383
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS EXCHANGE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current
(2,3)
per Input HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
V
CC
= Max., V
IN
= 3V, f = 0 per Control Input
V
CC
= 3.3V, A, B,C, or D Pins Open, Control
Inputs Toggling @ 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per input driven at the specified level. A, B, C, and D pins do not contribute to
∆Icc.
3. This parameter is guaranteed but not tested.
4. This parameter represents the current required to switch internal capacitance at the specified frequency. The A, B, C, and D inputs do not contribute to the Dynamic Power Supply
Current. This parameter is guaranteed but not production tested.
Min.
—
—
Typ.
1.5
—
Max.
3
30
Unit
mA
µA
See Typical I
CCD
vs Enable Frequency graph below
TYPICAL I
CCD
vs ENABLE FREQUENCY CURVE AT V
CC
= 3.3V
20
18
16
14
12
10
I
CCD
(mA)
8
6
4
2
0
0
2
4
6
8
10
12
14
16
18
20
ENABLE FREQUENCY (MHz)
4
IDTQS3VH383
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS EXCHANGE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C
V
CC
= 2.5 ± 0.2V
(1)
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PBX
f
ENABLE
Parameter
Data Propagation Delay
(2,3)
Ax or Bx to Cx or Dx, Cx or Dx to Ax or Bx
Switch Turn-On Delay
BE
to Ax, Bx, Cx, Dx
Switch Turn-Off Delay
BE
to Ax, Bx, Cx, Dx
Bus Exchange Propagation Delay
BX to Ax, Bx, Cx, Dx
Operating Frequency - Enable (BE )
(2,5)
1.5
1.5
1.5
8.5
8
8
10
1.5
1.5
1.5
8.5
8
7.5
20
ns
ns
ns
MHz
Min
.
(4)
Max.
V
CC
= 3.3 ± 0.3V
(1)
Min
.
(4)
Max.
Unit
ns
0.2
0.2
NOTES:
1. See Test Conditions under TEST CIRCUITS AND WAVEFORMS.
2. This parameter is guaranteed but not production tested.
3. 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 0.25ns at C
L
= 50pF. Since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very little propagation delay to the
system. Propagation delay of 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.
4. Minimums are guaranteed but not production tested.
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