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IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH(R) PRODUCTS HIGH-SPEED CMOS SYNCHROSWITCHTM 32:16 MUX/DEMUX
FEATURES:
- - - - - - - - - - - - Enhanced N channel FET with no inherent diode to Vcc Bidirectional signal flow Flow-through pinout Zero propagation delay, zero ground bounce 16 banks of 2:1 Mux/Demux Port select synchronous to the clock Clock enable and Asynchronous enable Undershoot clamp diodes on all switch and control pins Asynchronous SEL option Break-before-make feature Available in 80-pin MillipaQ (Q3) Bus-hold eliminates floating bus lines and reduces static power consumption
IDTQS34XS257
DESCRIPTION:
The QS34XS257 is a high-speed CMOS quad 32:16 multiplexer/ demultiplexer. It is organized as four independent quad 2:1 mux/demux blocks. Port selection and connection, controlled by SEL signals, can be either asynchronous or synchronous. In the synchronous mode, the A or B port to Y port connection is updated on the rising edge of the input clock CLK. Once the port-to-port connection is made, data flow can be bidirectional with a typical 250ps propagation delay through the switch. Clock Enable, overriding Asynchronous Enable, and Asynchronous Select controls provide additional design flexibility. Synchronous controls ease timing constraints in many high speed data mux/demux applications, such as bank interleaving. The QS34XS257 is available in the space-saving, 80-pin dual-in-line MillipaQ package. The QS34XS257 is characterized for operation at -40C to +85C.
APPLICATIONS:
- Memory Interleaving
FUNCTIONAL BLOCK DIAGRAM
SELn CLKn CLKENn OEn SYNCn CONTROL LOGIC
An0 Yn0 Bn0 An1 Yn1 Bn1 An2 Yn2 Bn2 An3 Yn3 Bn3
NOTE: One of four blocks shown.
INDUSTRIAL TEMPERATURE RANGE
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c 1999 Integrated Device Technology, Inc.
NOVEMBER 1999
DSC-5578/-
IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC A00 A01 A02 A03 B00 B01 B02 B03 G ND NC A10 A11 A12 A13 B10 B11 B12 B13 G ND NC A20 A21 A22 A23 B20 B21 B22 B23 G ND NC A30 A31 A32 A33 B30 B31 B32 B33 G ND 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 29 30 31 32 33 34 35 36 37 38 39 40 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 Vcc O E0 SEL0 Y00 Y01 Y02 Y03 CLKEN0 CLK0 SYN C0 Vcc O E1 SEL1 Y10 Y11 Y12 Y13 CLKEN1 CLK1 SYN C1 Vcc O E2 SEL2 Y20 Y21 Y22 Y23 CLKEN2 CLK2 SYN C2 Vcc O E3 SEL3 Y30 Y31 Y32 Y33 CLKEN3 CLK3 SYN C3
ABSOLUTE MAXIMUM RATINGS
Symbol VTERM(2) VTERM(3) VTERM(3) VAC IOUT PMAX TSTG Description Supply Voltage to Ground DC Switch Voltage VS DC Input Voltage VIN AC Input Voltage (pulse width 20ns) DC Output Current Maximum Power Dissipation (TA = 85C) Storage Temperature
(1) Unit V V V V mA W C
Max. - 0.5 to +7 - 0.5 to +7 - 0.5 to +7 -3 120 1.16 - 65 to +150
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 Terminals. 3. All terminals except Vcc.
CAPACITANCE
(TA = +25OC, f = 1.0MHz, VIN = 0V, VOUT = 0V)
Pins Control Inputs Quickswitch Channels (Switch OFF) Demux Mux Typ. 4 5 7 Max. (1) 5 7 9 Unit pF pF pF
NOTE: 1. This parameter is guaranteed at characterization but not tested.
PIN DESCRIPTION
Pin Names An0 - An3 Bn0 - Bn3 Yn0 - Yn3 SELn CLKn CLKENn OEn SYNCn I/O I/O I/O I/O I I I I I Description Demux Port A Demux Port B Mux Port Y Select Input Clock Clock Enable Output Enable Synchronous Selection Enable
MILLIPAQ TOP VIEW 2
IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
FUNCTION TABLE(1)
Control Inputs SYNC L L L L L H H H OEn L L H L H L L H CLKn X X X CLKENn L L L H H X X X SELn L H X X X L H X An0 Bn0 Yn0 An0 Bn0 Yn1 An1 Bn1 Port Status Yn2 An2 Bn2 Yn3 An3 Bn3 Select Port A Select Port B Switch OFF (2) Hold Previous Mux connection (3) (Switch ON) Switch OFF (4) An3 Bn3 Select Port A Select Port B Hold Previous Data (Switch OFF) Function
No change in Mux connection No change in Mux connection No change in Mux connection An1 Bn1 An2 Bn2
No change in Mux connection
NOTES: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care = Low-to-High Transition 2. Mux switches are turned off. The port connection can be changed by the SEL input. 3. The contents of the "Mux select register" are unchanged and the previous Mux connection is unchanged. The output (Mux port) data state will depend on the present data state of the input (Demux port). 4. The contents of the "Mux select register" are unchanged.
CONTROL LOGIC (1)
1 2:1 MUX SE Ln 0 D Q 0 2:1 MUX 1 C LK EN n C LK n SYN C n OEn To Port A Sw itches To Port B Sw itches
NOTE: 1. One of four blocks.
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IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol VIH VIL IIN RON Parameter Input HIGH Voltage Input LOW Voltage Input Leakage Current (Control Inputs) Switch ON Resistance (2) Test Conditions Guaranteed Logic HIGH for Control Pins Guaranteed Logic LOW for Control Pins 0V VIN Vcc Vcc = Min., VIN = 0V, ION = 30mA Vcc = Min., VIN = 2.4V, ION = 15mA
NOTES: 1. Typical values are at VCC = 5.0V, TA = 25C. 2. Measured by voltage drop between A/B and Y pin at indicated current through the switch.
Min. 2 -- -- -- --
Typ.(1) -- -- 0.1 7 10
Max. -- 0.8 1 9 13
Unit V V A
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
16
RON
(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
VIN
(Volts)
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IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol ICCQ ICC ICCD Parameter Quiescent Power Supply Current Power Supply Current per Control Input HIGH (2) Dynamic Power Supply Current per MHz(3) Test Conditions(1) VCC = Max., VCTRL = GND or Vcc, f = 0 VCC = Max., VIN = 3.4V, f = 0 VCC = Max., A/B and Y pins open Control Input Toggling at 50% Duty Cycle Max. 12 1.5 0.25 Unit mA mA mA/MHz
NOTES: 1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics. 2. Per TLL driven control inputs. A/B and Y pins do not contribute to Icc. 3. This current applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The A/B and Y inputs generate no significant AC or DC currents as they transition. This parameter is guaranteed but not production tested.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40C to +85C, VCC = 5.0V 10% CLOAD = 50pF, RLOAD = 500 unless otherwise noted.
Symbol tPLH tPHL tSEC tHEC tCSO tASO tW tSCS tHCS tPZL tPZH tPLZ tPHZ Parameter Data Propagation Delay (1,2) A/B to Y, Y to A/B Clock Enable to Clock Setup Time Clock Enable to Clock Hold Time Clock to A, B Switch Turn-On Delay (3) Asynchronous Select to A, B Switch Turn-On Delay (3) Clock Pulse Width HIGH Clock to SEL Setup Time Clock to SEL Hold Time Asynchronous Enable to Switch Turn-On Delay (3) Asynchronous Enable to Switch Turn-Off Delay (1,3) Min. -- 3 0 0.5 0.5 3 3 0 1.5 1.5 Typ. 0.25 -- -- -- -- -- -- -- -- -- Max. -- -- -- 7 7 -- -- -- 5.2 4.8 Unit
ns ns ns ns ns ns ns ns ns ns
NOTES: 1. This parameter is guaranteed but not tested. 2. 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 for 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. 3. Minimums guaranteed but not tested.
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IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
TIMING WAVEFORMS - SYNCHRONOUS MODE, DEMUX FUNCTION
SYNC tSEC tHEC CLK EN
CLK tSCS tHCS SEL tSC S tHCS
OE
Port Y
DATA 0
DATA 1 tPLH , tPHL
DATA 2
tCSO Port A INVALID D ATA DATA 0 DATA 1 HOLD PR EVIOUS DATA, DATA 1 tPLH , tPHL tCSO Port B INVALID D ATA DATA 1 DATA 2 HOLD PR EVIOUS DATA, DATA 2
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IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
TIMING WAVEFORMS - SYNCHRONOUS MODE, MUX FUNCTION
SY NC tSEC tHEC CLKEN
CLK tSCS tHCS tSCS tHCS
SEL0, SE L1
Port A
DATA1
DATA2
Port D
INV ALID D ATA tCSO tPLH, tPH L tCSO
DATA3
DATA4
tPLH, tPHL DATA3 DATA4
Port Y
INVALID D ATA
DAT A1
DATA2
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IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
TIMING WAVEFORMS - ASYNCHRONOUS MODE, MUX FUNCTION
SYNC
SEL
OE
Port A
INVALID DATA
DATA1 tPLH, tPHL
DATA2 tPLH, tPHL
Port B
INVALID DATA
DATA3 tPLZ, tPHZ DATA3 tPZL, tPZH
tASO Port Y INVALID D ATA DATA1 DATA2
DATA3
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IDTQS34XS257 HIGH-SPEED CMOS SYNCHROSWITCH 32:16 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXX Device Type XX Package X Process
Blank
Industrial (-40C to +85C)
Q3
150 mil MillipaQ
34XS257
High Speed CMOS SynchroSwitch 32:16 Mux/Dem ux
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
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*To search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2. The IDT logo, QuickSwitch, and SynchroSwitch are registered trademarks of Integrated Device Technology, Inc.
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