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24-BIT BUS EXCHANGE SWITCH Integrated Device Technology, Inc. IDT74FST163212 ADVANCE INFORMATION FEATURES: * Bus switches provide zero delay paths * Extended commercial range of -40C to +85C * Low switch on-resistance: FST163xxx - 4 * 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 DESCRIPTION: The FST163212 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. The FST163212 provides four 12-bit TTL- compatible ports that support 2 way bus exchange. The S0-2 pins control the bus exchange and switch enable functions. FUNCTIONAL BLOCK DIAGRAM 1 of 12 Channels 1A1 1B1 1A2 1B2 Flow Control S0 S1 S2 3508 drw 01 PIN DESCRIPTION Pin Names A1, A2 B1, B2 S0-2 I/O I/O I Description Buses A1, A2, B1, B2 Control Pins for Mux and Switch Enable Functions 3508 tbl 01 The IDT logo is a registered trademark of Integrated Device Technology, Inc. COMMERCIAL TEMPERATURE RANGE (c)1996 Integrated Device Technology, Inc. SEPTEMBER 1996 DSC-3508/- 1 IDT74FST163212 24-BIT BUS EXCHANGE SWITCH COMMERCIAL TEMPERATURE RANGE PIN CONFIGURATION S0 1A1 1A2 2A1 2A2 3A1 3A2 ABSOLUTE MAXIMUM RATINGS(1) 56 55 54 53 52 51 50 49 48 47 46 45 44 S1 S2 1B1 1B2 2B1 2B2 3B1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 SO56-1 SO56-2 SO56-3 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 3508 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. GND 4A1 4A2 5A1 5A2 6A1 6A2 7A1 7A2 GND 3B2 4B1 4B2 2. VCC, Control and Switch terminals. CAPACITANCE(1) Symbol Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. Unit 4 pF pF 3508 tbl 03 5B1 5B2 6B1 6B2 7B1 7B2 8B1 CIN CI/O 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 NOTES: 1. Capacitance is characterized but not tested 2. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V VCC 8A1 FUNCTION TABLE S2 L L L L H H H H S1 L L H H L L H H S0 L H L H L H L H A1 Z B1 B2 Z Z Z B1 B2 A2 Z Z Z B1 B2 Z B2 B1 Function Disconnect A1 to B1 A1 to B2 A2 to B1 A2 to B2 Disconnect A1 to B1, A2 to B2 A1 to B2, A2 to B1 3508 tbl 04 GND 8A2 9A1 9A2 10A1 10A2 GND 8B2 9B1 9B2 10B1 10B2 11B1 11B2 12B1 12B2 11A1 11A2 12A1 12A2 SSOP/ TSSOP/TVSOP TOP VIEW 3508 drw 02 2 IDT74FST163212 24-BIT BUS EXCHANGE 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 = 64mA 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 1 3 A A 3508 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 4 4 10 Max. -- 0.8 1 1 1 1 -- -1.2 7 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. 3 IDT74FST163212 24-BIT BUS EXCHANGE 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 Pins Toggling (24 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 -- 7.2 9.6 -- 7.7 11.1 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. 3508 tbl 06 SWITCHING CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial: TA = -40C to +85C, VCC = 5.0V 10% Symbol tPLH tPHL tBX tPZH tPZL tPHZ tPLZ |QCI| |QDCI| Description Data Propagation Delay A to B, B to A(3,4) Switch Multiplex Delay S to A, B Switch Turn on Delay S to A, B Switch Turn off Delay S to A, B (3) Charge Injection, Typical(5,7) Charge Injection, Typical(6,7) Condition(1) CL = 50pF RL = 500 Min.(2) -- 1.5 1.5 1.5 -- -- Typ. -- -- -- -- 1.5 0.5 Max. 0.25 6.5 6.5 7 -- -- Unit ns ns ns ns pC 3508 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.- A1 to B1 = >A1 to B2), 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 A1 to B1 switch is compensated by the turn on of the A1 to B2 switch. 7. Characterized parameter. Not 100% tested. 4 IDT74FST163212 24-BIT BUS EXCHANGE 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 3508 lnk 03 SWITCH POSITION 7.0V Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open VOUT 500 3508 lnk 08 DEFINITIONS: CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. 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 3508 lnk 04 PULSE WIDTH tH LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE 1.5V tREM 1.5V tSU tH 3508 lnk 05 PROPAGATION DELAY 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V 3508 lnk 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 3508 lnk 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 5 IDT74FST163212 24-BIT BUS EXCHANGE SWITCH COMMERCIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XX FST 16 XX Temp. Range Device Type X Package PV PA PF Shrink Small Outline Package (SO56-1) Thin Shrink Small Outline Package (SO56-2) Thin Very Small Outline Package (SO56-3) 163212 24-Bit Bus Exchange Switch 74 -40C to +85C 3508 drw 08 6 |
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