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IDT74FST1632861 20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
IDT74FST1632861
FEATURES:
* * * * Bus switches provide zero delay paths Low switch on-resistance: 28 TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) * Hot insertion capability * Very low power dissipation * Available in SSOP, TSSOP, and TVSOP packages
DESCRIPTION:
The FST1632861 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. With-out adequate bias on the gate-to-source junction of the FET, the FET is turned off, therefore with no VCC applied, the device has hot insertion capability. The FST1632861 bus switch has a built-in 28 series resistor to reduce noise which can result from reflections. This 28 built-in series resistor eliminates the need for an external terminating resistor.
FUNCTIONAL BLOCK DIAGRAM
1OE
2OE
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
B0 B1 B2 B3 B4 B5 B6 B7 B8 B9
A10 A11 A12 A13 A14 A15 A16 A17 A18 A19
B10 B11 B12 B13 B14 B15 B16 B17 B18 B19
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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(c) 2006 Integrated Device Technology, Inc.
JUNE 2006
DSC-5582/4
IDT74FST1632861 20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 GND NC A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 VCC
1OE
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) TSTG IOUT Description 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
B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 Vcc
2OE
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.
CAPACITANCE(1)
Symbol CIN CI/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. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V.
B10 B11 B12 B13 B14 B15 B16 B17 B18 B19
PIN DESCRIPTION
Pin Names xOE Ax Bx Description Output Enable Inputs (Active LOW) A Port Bits B Port Bits
FUNCTION TABLE(1)
SSOP/ TSSOP/ TVSOP TOP VIEW Inputs xOE L H
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level
Outputs Connect A to B Disconnect A from B
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IDT74FST1632861 20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
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 IIH IIL IOZH IOZL VIK IOFF ICC 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 VCC = Min., IIN = -18mA VCC = 0V, VIN or VO 5.5V VCC = Max., VIN = GND or VCC VCC = Max., VO = 0 to 5V Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs VCC = Max. VI = VCC VI = GND Min. 2 -- -- -- -- -- -- -- -- Typ.(2) -- -- -- -- -- -- -0.7 -- 0.1 Max. -- 0.8 1 1 1 1 -1.2 1 3 V A A A Unit V V A
BUS SWITCH IMPEDANCE OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol RON IOS Parameter Switch CONNECT Resistance, (2) A to B Short Circuit Current, A to B
(3) (1)
Test Conditions VIN = 0V, ION = 48mA VIN = 2.4V, ION = 15mA A(B) = 0V, B(A) = Vcc
Min. 20 20 100
Typ. 28 35 --
Max. 40 48 --
Unit mA
NOTES: 1. Typical values are at Vcc = 5.0V, +25C 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.
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IDT74FST1632861 20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4,5) VCC = Max. VIN = 3.4V(3) VCC = Max. Outputs Open Select Input Togging 50% Duty Cycle VCC = Max. Outputs Open Two Enable Pins Toggling fi = 10MHz 50% Duty Cycle
NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. TA = -40C to +85C 2. Typical values are at VCC = 5.0V, +25C ambient. 3. Per TTL driven input (VIN = 3.4V). All other inputs at VCC or GND. Switch inputs do not contribute to ICC. 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. CPD = ICCD/VCC CPD = Power Dissipation Capacitance 6. IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ICC DHNT + ICCD (fiN) ICC = Quiescent Current ICC = Power Supply Current for a TTL High Input (VIN = 3.4V) DH = Duty Cycle for TTL Inputs High NT = Number of TTL Inputs at DH ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL) fi = Control Input Frequency N = Number of Control Inputs Toggling at fi
Test Conditions(1)
Min. --
Typ.(2) 0.5 30
Max. 1.5 400
Unit mA A/ MHz/ Select mA
VIN = VCC VIN = GND
--
IC
Total Power Supply Current(6)
VIN = VCC VIN = GND VIN = 3.4V VIN = GND
-- --
0.6 0.7
8 9.5
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%
VCC = 5V 10% Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| Description(1) Data Propagation Delay A to B, Y to B(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) Min. -- 1.5 1.5 -- Typ. -- -- -- 1.5 Max. 0.25 6.5 7 -- VCC = 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. |QCI| is the charge injection for a single switch DISCONNECT and applies to either single switches or multiplexers. |QDCI| 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.
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IDT74FST1632861 20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
VCC 500 VIN Pulse Generator RT D.U.T. 50pF CL 500 OPPOSITE PHASE INPUT TRANSITION VOUT OUTPUT tPLH tPHL 7.0V SAME PHASE INPUT TRANSITION tPLH tPHL 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
Propagation Delay Test Circuits for All Outputs
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL SYNCHRONOUS CONTROL
tSU
tH
tREM
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
VCC
tSU
tH
Set-up, Hold, and Release Times
ENABLE
1 MHz Signal Generator Enable/Select(1) Switch In Switch In (MUX)
(2)
DISABLE 3V 1.5V 0V 3.5V 0.3V tPHZ 0.3V 1.5V 0V VOH 0V VOL
D.U.T.
Switch Out
VOUT(3)
CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 3.5V 1.5V tPLZ
CL = 50pF
Charge Injection
NOTES: 1. Select is used with multiplexers for measuring IQDCII during multiplexer select. During all other tests Enable is used. 2. Used with multiplexers to measure IQDCII only. 3. Charge Injection = VOUT CL, with Enable toggling for IQCII or Select toggling for IQDCII. VOUT is the change in VOUT and is measured with a 10M probe.
Enable and Disable Times
NOTES: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns.
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
1.5V
Pulse Width 5
IDT74FST1632861 20-BIT, TWO PORT BUS SWITCH WITH RESISTOR
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT FST XX Temp. Range XXX Family XXX Device Type XX Package
PV PVG PA PAG PF PFG 2861 163 74
Shrink Small Outline Package SSOP - Green Thin Shrink Small Outline Package TSSOP - Green Thin Very Small Outline Package TVSOP - Green 20-Bit Flow Through Switch with Resistor Double-Density Bus Switch -40C to +85C
CORPORATE HEADQUARTERS 6024 Silver Creek Valley Road San Jose, CA 95138
for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com 6
for Tech Support: logichelp@idt.com

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