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IDT74FST32XL384 20-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
20-BIT BUS SWITCH
IDT74FST32XL384
FEATURES:
* * * *
Bus switches provide zero delay paths Low switch on-resistance; 5 TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) * Available in SSOP and TSSOP packages
DESCRIPTION:
The FST32XL384 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. Thus 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 gateto-source junction of the FET, the FET is turned off, therefore with no VCC applied, the device has hot 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 FST32XL384 is a 20-bit TTL-compatible bus switch. The BEx pins provide enable control.
FUNCTIONAL BLOCK DIAGRAM
A0 B0 A10 B10
A4
B4
A14
B14
A5
B5
A15
B15
A9
B9
A19
B19
BEA BEC
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
BED BEB
INDUSTRIAL TEMPERATURE RANGE
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(c) 2002 Integrated Device Technology, Inc.
JUNE 2002
DSC-4681/1
IDT74FST32XL384 20-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
BEA B0 A0 A1 B1 B2 A2 A3 B3 B4 A4 GND BEC B5 A5 A6 B6 B7 A7 A8 B8 B9 A9 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 B19 A19 A18 B18 B17 A17 A16 B16 B15 A15 BEB Vcc A14 B14 A13 B13 B12 A12 A11 B11 B10 A10 BED
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
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. 4 8 Unit pF pF
NOTES: 1. Capacitance is characterized but not tested. 2. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V.
PIN DESCRIPTION
Pin Names A0 - A19 B0 - B19 BEA BEB BEC BED I/O I/O I/O I I I I Bus A Bus B Enable, 0-4 Enable, 15-19 Enable, 5-9 Enable, 10-14 Description
FUNCTION TABLE(1)
BEA H L H L BEC BEB H H L L BED H H L L B0 - B4 Z A0 - A4 Z A0 - A4 B0 - B4 Z A5 - A9 Z A5 - A9 B15 - B19 Z Z A15 - A19 A15 - A19 B15 - B19 Z Z A10 - A14 A10 - A14 Description Disconnect Connect Connect Connect Description Disconnect Connect Connect Connect
SSOP/ TSSOP TOP VIEW
H L H L
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level Z = High-Impedance
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IDT74FST32XL384 20-BIT BUS SWITCH
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 IOS VIK RON IOFF ICC Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current (3-State Output Pins) Short Circuit Current Clamp Diode Voltage Switch On Resistance(4) Input/Output Power Off Leakage Quiescent Power Supply Current Vcc = Max., VO = GND(3) VCC = Min., IIN = -18mA Vcc = Min., VIN = 0V, ION = 30mA Vcc = Min., VIN = 2.4V, ION = 15mA VCC = 0V, VIN or VO 4.5V VCC = Max., VI = GND or VCC VCC = Max. Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs VCC = Max. VI = VCC VI = GND VO = VCC VO = GND Min. 2 -- -- -- -- -- -- -- -- -- -- -- Typ.(2) -- -- -- -- -- -- 300 -0.7 5 10 -- 0.1 Max. -- 0.8 1 1 1 1 -- -1.2 7 15 1 3 mA V A A A Unit V V A
NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at Vcc = 5.0V, +25C ambient. 3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second. 4. Measured by voltage drop between ports at indicated current through the switch.
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4,5) Total Power Supply Current(6) VCC = Max. VIN = 3.4V(3) VCC = Max., Outputs Open Enable Pin Toggling 50% Duty Cycle VCC = Max., Outputs Open Enable Pins Toggling (20 Switches Toggling) fi = 10MHz 50% Duty Cycle VIN = VCC VIN = GND VIN = VCC VIN = GND VIN = 3.4V VIN = GND Test Conditions(1) Min. -- -- Typ.(2) 0.5 30 Max. 1.5 40 Unit mA A/ MHz/ Switch mA
IC
--
6
8
--
7
11
NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. 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. 4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. 5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested. 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 All currents are in milliamps and all frequencies are in megahertz.
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IDT74FST32XL384 20-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| Description(1) Data Propagation Delay Ax to Bx, Bx to Ax(3,4) Switch Turn On Delay BEx to Ax, Bx Switch Turn Off Delay BEx to Ax, Bx(3) Charge Injection(5,6) Condition CL = 50pF RL = 500 Min. -- 1.5 1.5 -- Typ. -- -- -- 1.5 Max. 0.25 6.5 5.5 -- Unit ns ns ns pC
NOTES: 1. See test circuit and waveforms. 2. Minimum limits guaranteed but not tested. 3. This parameter is guaranteed by design but not tested. 4. 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 2.5ns for 50pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals, it adds very little propagation delay to the system. Propagation delay on 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. 5. Measured at switch turn off, load = 50 pF in parallel with 10 M scope probe, VIN = 0.0 volts. 6. Characterized parameter. Not 100% tested.
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IDT74FST32XL384 20-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V CC 500 VIN Pulse Generator RT D.U.T. 50pF CL 500 VOUT 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Octal link
Test Circuits for All Outputs
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC.
tSU
tH
tREM
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
Octal link
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
Octal link
1.5V
1.5V
tSU
tH
Pulse Width
Set-up, Hold, and Release Times
ENABLE SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
Octal link
DISABLE 3V 1.5V
CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 1.5V 0V 3.5V 1.5V tPHZ 0.3V tPLZ
0V 3.5V 0.3V VOL VOH 0V
Octal link
Propagation Delay
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.
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IDT74FST32XL384 20-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT XX FST XXXXXXX Temp. Range Device Type XX Package
PV PA
Shrink Small Outline Package Thin Shrink Small Outline Package
32XL384
20-Bit Bus Switch
74
-40C to +85C
DATA SHEET DOCUMENT HISTORY
5/24/2002 Removed TVSOP package
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
for Tech Support: logichelp@idt.com (408) 654-6459
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