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| 16-BIT BUS SWITCH IDT74FST163244 ADVANCE INFORMATION Integrated Device Technology, Inc. FEATURES: * Bus switches provide zero delay paths * Extended commercial range of -40C to +85C * Low switch on-resistance: FST163xxx - 7 * 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, TSSOP and TVSOP * Pin-compatible with FCT16244/FCT162244T DESCRIPTION: The FST163244 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 gate-to-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. FUNCTIONAL BLOCK DIAGRAM 1OE 1A1 1A2 1A3 1A4 1B1 1B2 1B3 1B4 3OE 3A1 3A2 3A3 3A4 3B1 3B2 3B3 3B4 2OE 2A1 2A2 2A3 2A4 2B1 2B2 2B3 2B4 4OE 4A1 4A2 4A3 4A4 4B1 4B2 4B3 4B4 3615 drw 01 PIN DESCRIPTION Pin Names XOE XAx XBx Description Output Enable Inputs (Active LOW) A Port Bits B Port Bits 3615 tbl 01 The IDT logo is a registered trademark of Integrated Device Technology, Inc. COMMERCIAL TEMPERATURE RANGE (c)1997 Integrated Device Technology, Inc. FEBRUARY 1997 DSC-3615/- 1 IDT74FST163244 16-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE PIN CONFIGURATION 1OE 1B1 1B2 ABSOLUTE MAXIMUM RATINGS(1) 48 47 46 45 44 43 42 41 40 39 38 2OE 1A1 1A2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Symbol Description VTERM(2) Terminal Voltage with Respect to GND TSTG Storage Temperature IOUT Maximum Continuous Channel Current Max. -0.5 to +7.0 -65 to +150 128 Unit V C mA GND 1B3 1B4 GND 1A3 1A4 VCC 2B1 2B2 VCC 2A1 2A2 3615 tbl 02 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 condiitions for extended periods may affect reliability. 2. VCC, Control and Switch terminals. GND 2B3 2B4 3B1 3B2 GND 2A3 2A4 3A1 3A2 SO48-1 37 SO48-2 SO48-3 36 35 34 33 32 31 30 29 28 27 26 25 CAPACITANCE(1) Symbol CIN CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. Unit 4 pF pF 3615 tbl 03 GND 3B3 3B4 GND 3A3 3A4 NOTES: 1. Capacitance is characterized but not tested 2. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V VCC 4B1 4B2 VCC 4A1 4A2 FUNCTION TABLE Inputs xOE L H Outputs Connect A to B Disconnect A from B 3615 tbl 04 GND 4B3 4B4 4OE GND 4A3 4A4 3OE 3615 drw 02 SSOP/ TSSOP/TVSOP TOP VIEW 2 IDT74FST163244 16-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial: TA = -40C to +85C, VCC = 5.0V 10% Symbol VIH VIL II H II L IOZH IOZL IOS VIK RON Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Voltage High Impedance Output Current (3-State Output pins) Short Circuit Current Clamp Diode Voltage Switch On Resistance(4) VCC = Max., VO = GND(3) VCC = Min., IIN = -18mA VCC = Min., VIN = 0.0V ION = 12mA VCC = Min., VIN = 2.4V ION = 8mA IOFF ICC Input/Output Power Off Leakage Quiescent Power Supply Current VCC = 0V, VIN or VO 4.5V VCC = Max., VIN = GND or VCC -- -- -- 0.1 1 3 A A 3615 tbl 05 Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs VCC = Max. VCC = Max. VI = VCC VI = GND VO = VCC VO = GND Min. 2.0 -- -- -- -- -- -- -- -- -- Typ.(2) -- -- -- -- -- -- 300 -0.7 5 10 Max. -- 0.8 1 1 1 1 -- -1.2 7 15 Unit V V A A mA V 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 tested 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) Test Conditions(1) VCC = Max. VIN = 3.4V(3) VCC = Max. Outputs Open Enable Pin Toggling 50% Duty Cycle VCC = Max. Outputs Open 4 Enable Pins Toggling (16 Switches Toggling) fi = 10MHz 50% Duty Cycle Min. -- -- Typ.(2) 0.5 30 Max. 1.5 40 Unit mA A/ MHz/ Switch mA VIN = VCC VIN = GND IC Total Power Supply Current (6) VIN = VCC VIN = GND VIN = 3.4 VIN = GND -- 4.8 6.4 -- 5.3 7.9 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 = Input Frequency N = Number of Switches Toggling at fi All currents are in milliamps and all frequencies are in megahertz. 3615 tbl 06 3 IDT74FST163244 16-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE SWITHCING CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial: TA = -40C to +85C, VCC = 5.0V 10% Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| |QDCI| Description Data Propagation Delay A to B, B to A(3,4) Switch Turn on Delay xOE to xBx Switch Turn off Delay xOE to xBx Charge Injection, Typical(5,7) Charge Injection, Typical(6,7) Condition(1) CL = 50pF RL = 500 Min.(2) -- 1.5 1.5 -- -- Typ. -- -- -- 1.5 0.5 Max. 0.25 6.5 7 -- -- Unit ns ns ns pC 3615 tbl 07 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. Measured at switch turn off through bus multiplexer, (e.g.- A to 1B = >A to 2B), load = 50 pF in parallel with 10 M scope probe, VIN at A = 0.0 volts. Charge injection is reduced because the injection from the turn off of the A to 1B switch is compensated by the turn on of the A to 2B switch. 7. Characterized parameter. Not 100% tested. 4 IDT74FST163244 16-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS TEST CIRCUITS FOR ALL OUTPUTS SWITCH POSITION Test Switch VCC 500 VIN Pulse Generator RT D.U.T. 50pF CL 500 VOUT 7.0V Open Drain Disable Low Enable Low All Other Tests Closed Open lnk 08 3615 DEFINITIONS: CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. 3615 lnk 03 SET-UP, HOLD AND RELEASE TIMES PULSE WIDTH DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tSU tH 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3615 lnk 04 LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE 1.5V tREM 1.5V 3615 lnk 05 tSU tH PROPAGATION DELAY ENABLE AND DISABLE TIMES ENABLE DISABLE 3V CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 1.5V 0V 0V 3615 lnk 07 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 3615 lnk 06 tPLZ 3.5V 1.5V tPHZ 0.3V 1.5V 0V 3.5V 0.3V VOL VOH NOTES: 1. Diagram shown for input Control Enable-LOW and input Control DisableHIGH 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns 5 IDT74FST163244 16-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XX FST XX Temp. Range Device Type X Package PV PA PF Shrink Small Outline Package (SO48-1) Thin Shrink Small Outline Package (SO48-2) Thin Very Small Outline Package (SO48-3) 16-Bit Bus Switch 163244 74 -40C to +85C 3615 drw 08 Integrated Device Technology, Inc. reserves the right to make changes to the specifications in this data sheet in order to improve design or performance and to supply the best possible product. Integrated Device Technology, Inc. 2975 Stender Way, Santa Clara, CA 95054-3090 6 Telephone: (408) 727-6116 FAX 408-492-8674 |
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