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PDF IDTQS34XVH245 Data sheet ( Hoja de datos )

Número de pieza IDTQS34XVH245
Descripción QUICKSWITCH PRODUCTS 2.5V / 3.3V 32-BIT HIGH BANDWIDTH BUS SWITCH
Fabricantes Integrated Device 
Logotipo Integrated Device Logotipo



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IDTQS34XVH245
2.5V / 3.3V 32-BIT HIGH BANDWIDTH BUS SWITCH
QUICKSWITCH® PRODUCTS
2.5V / 3.3V 32-BIT HIGH
BANDWIDTH BUS SWITCH
INDUSTRIALTEMPERATURERANGE
IDTQS34XVH245
PRELIMINARY
FEATURES:
• 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 RON , 4typical
• Flat RON characteristics over operating range
• Rail-to-rail switching 0 - 5V
• Bidirectional dataflow with near-zero delay: no added ground
bounce
• Excellent RON matching between channels
• VCC operation: 2.3V to 3.6V
• High bandwidth - up to 500MHz
• LVTTL-compatible control Inputs
• Undershoot Clamp Diodes on all switch and control Inputs
• Low I/O capacitance, 4pF typical
• Available in 80-pin QVSOP package
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 A1 A2 A3 A4 A5 A6 A7
DESCRIPTION:
The QS34XVH245 HotSwitch is a high bandwidth 32-bit bus switch. The
QS34XVH245 has very low ON resistance, resulting in under 250ps propa-
gation delay through the switch. The switches can be turned ON under the
control of individual LVTTL-compatible Output Enable (OEx) signals for
bidirectionaldataflowwithnoaddeddelayorgroundbounce. IntheONstate,
the switches can pass up to 5V. In the OFF state, the switches offer very high
impedence at the terminals.
The combination of near-zero propagation delay, high OFF impedance, and
over-voltage tolerance makes the QS34XVH245 ideal for high performance
communicationsapplications.
The QS34XVH245 is characterized for operation from -40°C to +85°C.
A16 A17 A18 A19 A20 A21 A22 A23
OE1
OE3
B0 B1 B2 B3 B4 B5 B6 B7
A8 A9 A10 A11 A12 A13 A14 A15
B16 B17 B18 B19 B20 B21 B22 B23
A24 A25 A26 A27 A28 A29 A30 A31
OE2
OE4
B8 B9 B10 B11 B12 B13 B14 B15
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
c 2003 Integrated Device Technology, Inc.
1
B24 B25 B26 B27 B28 B29 B30 B31
MARCH 2003
DSC-5593/8

1 page




IDTQS34XVH245 pdf
IDTQS34XVH245
2.5V / 3.3V 32-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIALTEMPERATURERANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C
VCC = 2.5 ± 0.2V (1)
VCC = 3.3 ± 0.3V (1)
Symbol
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Parameter
Data Propagation Delay(2,3)
Ax to/from Bx
Switch Turn-On Delay
OEx to Ax/Bx
Switch Turn-Off Delay
OEx to Ax/Bx
Min. (4)
1.5
1.5
Max. Min. (4)
0.2
8 1.5
7 1.5
Max.
0.2
7
6.5
fOEx Operating Frequency - Enable(2,5)
10
20
Unit
ns
ns
ns
MHz
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 0.2ns at CL = 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.
5. Maximum toggle frequency for OEx control input (pass voltage > VCC, VIN = 5V, RLOAD 1M, no CLOAD).
5

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