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| 4-BIT BUS SWITCH IDT74FST3125 Integrated Device Technology, Inc. FEATURES: * Bus switches provide zero delay paths * Extended commercial range of -40C to +85C * Low switch on-resistance: FST3xxx - 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 QSOP and SOIC DESCRIPTION: The FST3125 belong 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 nchannel 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. The FST3125 is a 4-bit TTL-compatible bus switch. The xOE pins provide individual enable control for each of the four bits. FUNCTIONAL BLOCK DIAGRAM 1A 1OE 1Y PIN CONFIGURATION 1 2 3 4 5 6 7 8 SOIC/QSOP TOP VIEW SO16-1 SO16-7 16 15 14 13 12 11 10 9 Vcc 4OE 4A 4Y 3OE 3A 3Y NC NC 1OE 2A 2OE 3A 3OE 4A 4OE 2Y 1A 1Y 3Y 2OE 2A 2Y 4Y GND 3471 drw 01 3471 drw 02 PIN DESCRIPTION Pin Names 1A-4A 1Y-4Y NC 1OE, 4OE I/O I/O I/O -- I Description Bus A Bus B No Connect Bus Switch Enable (Active LOW) 3471 tbl 01 The IDT logo is a registered trademark of Integrated Device Technology, Inc. COMMERCIAL TEMPERATURE RANGE (c)1996 Integrated Device Technology, Inc. AUGUST 1996 DSC-4668/- 1 IDT74FST3125 4-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS(1) 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 FUNCTION TABLE OE H L Y Hi-Z A Description Disconnect Connect 3471 tbl 03 CAPACITANCE(1) Symbol CIN CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. Unit 4 pF pF 3471 tbl 04 3471 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. NOTES: 1. Capacitance is characterized but not tested 2. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial: TA = -40C to +85C, VCC = 5.0V 5% 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. 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 VCC = Max., VO = GND(3) VCC = Min., IIN = -18mA VCC = Min. VIN = 0.0V ION = 30mA VCC = Min. VIN = 2.4V ION = 15mA 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 -- 10 15 Min. 2.0 -- -- -- -- -- -- -- -- Typ.(2) -- -- -- -- -- -- 300 -0.7 5 Max. -- 0.8 Unit V V 1 1 1 1 -- -1.2 7 A A mA V A A 3471 tbl 05 1 3 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. 2 IDT74FST3125 4-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE 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 Enable Pin Toggling (4 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 -- 1.2 1.6 -- 1.5 2.4 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. 3471 tbl 06 SWITCHING CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial: TA = -40C to +85C, VCC = 5.0V 5% Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| Description Data Propagation Delay A to Y, Y to A(3,4) Switch Turn on Delay OE to A, Y Switch Turn off Delay OE to A, Y(3) Charge Injection (5,6) Condition(1) CL = 50pF RL = 500 Min.(2) -- 1.5 1.5 -- Typ. -- -- -- 1.5 Max. 0.25 6.5 5.5 -- Unit ns ns ns pC 3471 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 10M scope probe, VIN = 0.0 volts. 6. Characterized parameter. Not 100% tested. 3 IDT74FST3125 4-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS TEST CIRCUITS FOR ALL OUTPUTS 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 Open 3471 lnk 08 DEFINITIONS: CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. Switch Closed 3471 drw 03 SET-UP, HOLD AND RELEASE TIMES DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tSU 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3471 drw 04 PULSE WIDTH tH LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE 1.5V tREM 1.5V 3471 drw 05 tSU tH PROPAGATION DELAY 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V 3471 drw 06 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 3471 drw 07 SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL 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 4 IDT74FST3125 4-BIT BUS SWITCH COMMERCIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XX FST XX Temp. Range Device Type X Package SO Q Small Outline IC (SO16-1) Quarter-size Small Outline Package (SO16-7) 3125 4-Bit Bus Switch 74 -40C to +85C 3471 drw 08 5 |
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