IDT74FST32390 OCTAL 2:1 MULTIPLEXER BUS SWITCH COMMERCIAL TEMPERATURE RANGE OCTAL 2:1 MULTIPLEXER BUS SWITCH FEATURES: - - - - - - IDT74FST32390 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. Bus switches provide zero delay paths Extended commercial range of -40C to +85C Low switch on-resistance: FST32xxx - 28 TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) Available in SOIC, QSOP, and TSSOP Packages 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 FST32390 integrates terminating resistors in the device, thus eliminating the need for external 25 series resistors. DESCRIPTION: The FST32390 is an 8-bit TTL-compatible 2:1 bus multiplexer. AEN = 0 connects port A to port C and BEN = 0 connects port B to port C. This device can be used to connect ports A & B to a common bus on port C or to broadcast data on port C to both ports A and B. The FST32390 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 PIN CONFIGURATION FUNCTIONAL BLOCK DIAGRAM A0 A7 C0 C7 AEN B0 B7 A0 1 28 Vcc B0 2 27 A7 C0 3 26 B7 A1 4 25 C7 B1 5 24 A6 C1 6 23 B6 A2 C6 B2 7 SO28-2 22 SO28-8 8 SO28-9 21 C2 9 20 B5 A3 10 19 C5 B3 11 18 A4 C3 12 17 B4 AEN 13 16 C4 GND 14 15 BEN A5 BEN SOIC/ QSOP/ TSSOP TOP VIEW COMMERCIAL TEMPERATURE RANGE OCTOBER 1999 1 c 1999 Integrated Device Technology, Inc. DSC-5528/- IDT74FST32390 OCTAL 2:1 MULTIPLEXER BUS SWITCH COMMERCIAL TEMPERATURE RANGE PIN DESCRIPTION ABSOLUTE MAXIMUM RATINGS(1) Symbol VTERM(2) Rating Terminal Voltage with Respect to GND TSTG Storage Temperature IOUT Maximum Continuous Channel Current Max. -0.5 to +7 Unit V Pin Names A0-7 I/O I/O Bus A -65 to +150 C B0-7 I/O Bus B mA C0-7 I/O Bus C FST LINK AEN, BEN I 128 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. CI/O Conditions(2) Switch Input/Output Capacitance Switch Off Typ. 4 Bus Switch Enable (Active LOW) FUNCTION TABLE(1) CAPACITANCE (1) Symbol Parameter CIN Control Input Capacitance Description AEN H BEN H A Off B Off Description Disconnect L H On Off A to C H L Off On B to C L L On On A, B to C NOTE: 1. H = HIGH L = LOW Unit pF pF 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 Parameter Input HIGH Voltage Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Min. 2 Typ.(2) -- Max. -- Unit V VIL Input LOW Voltage Guaranteed Logic LOW for Control Inputs -- -- 0.8 V IIH Input HIGH Current VCC = Max. -- -- 1 A IIL Input LOW Voltage IOZH High Impedance Output Current IOZL (3-State Output pins) VI = VCC VCC = Max. VCC = Max., VI = GND -- -- 1 VO = VCC -- -- 1 VO = GND -- -- 1 -- 300 -- VO = GND(3) A IOS Short Circuit Current mA VIK Clamp Diode Voltage VCC = Min., IIN = -18mA -- -0.7 -1.2 V RON Switch On Resistance(4) VCC = Min. VIN = 0.0V 17 28 40 20 35 48 ION = 30mA VCC = Min. VIN = 2.4V ION = 15mA IOFF Input/Output Power Off Leakage VCC = 0V, VIN or VO 4.5V -- -- 1 A ICC Quiescent Power Supply Current VCC = Max., VI = GND or VCC -- 0.1 3 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 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 IDT74FST32390 OCTAL 2:1 MULTIPLEXER BUS SWITCH COMMERCIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) IC Total Power Supply Current(6) 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 (8 Switches Toggling) fi = 10MHz 50% Duty Cycle Min. -- Typ.(2) 0.5 Max. 1.5 Unit mA VIN = VCC VIN = GND -- 30 40 A/ MHz/ Switch VIN = VCC VIN = GND -- 2.4 3.2 mA VIN = 3.4 VIN = GND -- 2.7 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. SWITCHING CHARACTERISTICS OVER OPERATING RANGE Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| Description Data Propagation Delay A, B to/from C(3,4) Switch Turn on Delay AEN/BEN to A, B, C Switch Turn off Delay AEN, BEN to A, B, C(3) Charge Injection(5,6) Condition(1) CL = 50pF RL = 500 Min.(2) -- Typ. -- Max. 1.25 Unit ns 1.5 -- 7.5 ns 1.5 -- 5.5 ns -- 1.5 -- 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 0.25 ns for 50 pF 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 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. 5. Measured at switch turn off, load = 50 pF in parallel with 10 M scope probe, VIN = 0 volts. 6. Characterized parameter. Not 100% tested. 3 IDT74FST32390 OCTAL 2:1 MULTIPLEXER BUS SWITCH COMMERCIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS TEST CIRCUITS FOR ALL OUTPUTS V CC SWITCH POSITION Test 7.0V Switch Open Drain 500 Disable Low V OUT V IN Pulse Generator Enable Low All Other Tests D.U.T. 50pF R Closed T C Open FCT LINK DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. 500 L O ctal lin k PULSE WIDTH SET-UP, HOLD, AND RELEASE TIMES 3V 1.5V 0V 3V 1.5V 0V DATA INPUT tH t SU TIM ING INPUT ASYNCHRONOUS C ONTROL PRES ET CLEAR ETC. SYNCHRO NOUS CONTRO L PRES ET CLEAR CLOCK ENABLE ETC. t REM t SU LO W -HIGH-LOW PULSE 1.5V tW 3V 1.5V 0V HIGH-LOW -HIGH PULSE 1.5V 3V 1.5V 0V tH O ctal lin k O ctal lin k PROPAGATION DELAY ENABLE AND DISABLE TIMES ENAB LE SAM E PHASE INPUT TRANSITION t PLH t PH L OUTPUT t PLH OPPOSITE P HASE INPUT TRANSITION t PH L 3V 1.5V 0V DISA BLE 3V CO NTROL INPUT 1.5V t PZL V OH 1.5V V OL OUTPUT NO RM A LLY LO W 3V 1.5V 0V SW ITCH CLOSE D O ctal lin k SW ITCH OPEN 3.5V 3.5V 1.5V 0.3V t PZH OUTPUT NO RM A LLY HIGH 0V t PLZ V OL t PHZ 0.3V V OH 1.5V 0V 0V O ctal lin k 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 IDT74FST32390 OCTAL 2:1 MULTIPLEXER BUS SWITCH COMMERCIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XX Temp. Range FST XXXX X Device Type Package SO Q PG Small Outline IC (SO28-2) Quarter-size Small Outline Package (SO28-8) Thin Shrink Small Outline Package (SO28-9) 32390 Octal 2:1 Multiplexer Bus Switch 74 - 40 C to +85 C 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* *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 is a registered trademark of Integrated Device Technology, Inc. 5