20-BIT BUS EXCHANGE SWITCH IDT74FST163383 IDT74FST1632383 ADVANCE INFORMATION 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 FST1632xxx integrates terminating resistors in the device, thus eliminating the need for external 25Ω series resistors. The FST163383 and FST1632383 each provide four 4-bit TTL- compatible ports that support 2 way bus exchange. The BX pin controls the bus exchange and the BE pin serves as the enable pin. FEATURES: • Bus switches provide zero delay paths • Extended commercial range of –40°C to +85°C • Low switch on-resistance: FST163xxx – 5Ω FST1632xxx — 28Ω • 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 FST163383/1632383 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 FUNCTIONAL BLOCK DIAGRAM A0 C0 A5 C5 B0 D0 B5 D5 A4 C4 A9 C9 B4 D4 B9 D9 BX1 BE1 BX2 BE2 3474 drw 01 PIN DESCRIPTION Pin Names A0-9, B0-9 I/O I/O Description Buses A, B C0-9, D0-9 I/O Buses C, D BE1,2 I Bus Switch Enable (Active LOW) BX1,2 I Bus Exchange 3474 tbl 01 The IDT logo is a registered trademark of Integrated Device Technology, Inc. COMMERCIAL TEMPERATURE RANGE MAY 1996 1997 Integrated Device Technology, Inc. DSC-3474/4 1 IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH COMMERCIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS(1) PIN CONFIGURATION BE1 1 48 Vcc C0 2 47 D4 A0 3 46 B4 B0 4 45 A4 D0 5 44 C4 C1 6 43 D3 A1 7 42 B3 B1 8 41 A3 D1 9 40 C3 C2 10 39 D2 A2 11 38 B2 GND 12 37 BX1 BE2 13 36 Vcc C5 14 35 D9 A5 15 34 B9 B5 16 33 A9 D5 17 32 C9 C6 18 31 D8 A6 19 30 B8 SO48-1 SO48-2 SO48-3 Symbol Description VTERM(2) Terminal Voltage with Respect to GND TSTG Storage Temperature I OUT Maximum Continuous Channel Current Max. –0.5 to +7.0 Unit V –65 to +150 °C 128 mA 3474 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. CAPACITANCE(1) Symbol Conditions(2) Typ. Unit Parameter CIN Control Input Capacitance CI/O Switch Input/Output Capacitance 4 Switch Off pF 3474 tbl 03 NOTES: 1. Capacitance is characterized but not tested. 2. TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V FUNCTION TABLE BE1 BX1 A0-4 pF H X Hi-Z B0-4 Hi-Z Description Disconnect L L C0-4 D0-4 Connect L H D0-4 C0-4 Exchange B6 20 29 A8 D6 21 28 C8 BE2 H BX2 X A5-9 Hi-Z B5-9 Hi-Z Description Disconnect C7 22 27 D7 L L C5-9 D5-9 Connect A7 23 26 B7 L H D5-9 C5-9 Exchange GND 24 25 BX2 3474 tbl 04 SSOP/ TSSOP/TVSOP TOP VIEW 3474 drw 02 2 IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH COMMERCIAL TEMPERATURE RANGE DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial: TA = –40°C to +85°C, VCC = 5.0V ±10% Parameter Input HIGH Voltage Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Min. 2.0 Typ.(2) — Max. — Unit V VIL Input LOW Voltage Guaranteed Logic LOW for Control Inputs — — 0.8 V II H Input HIGH Current VCC = Max. VI = VCC — — ±1 µA II L Input LOW Voltage VI = GND — — ±1 IOZH High Impedance Output Current IOZL (3-State Output pins) IOS Short Circuit Current VIK Clamp Diode Voltage Symbol VIH RON Switch On Resistance(4) VO = VCC — — ±1 VO = GND — — ±1 VCC = Max., VO = GND(3) — 300 — mA VCC = Min., IIN = –18mA — –0.7 –1.2 V Ω VCC = Max. VCC = Min. VIN = 0.0V 163xxx — 5 7 ION = 30mA 1632xxx 17 28 40 VCC = Min. VIN = 2.4V 163xxx — 10 15 ION = 15mA 1632xxx 20 35 48 µA Ω IOFF Input/Output Power Off Leakage VCC = 0V, VIN or VO ≤ 4.5V — — 1 µA ICC Quiescent Power Supply Current VCC = Max., VIN = GND or VCC — 0.1 3 µA 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, +25°C 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 3474 tbl 05 IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH COMMERCIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Symbol ∆ICC ICCD IC Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) 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 Pins Toggling (20 Switches Toggling) fi = 10MHz 50% Duty Cycle Min. — Typ.(2) 0.5 Max. 1.5 Unit mA VIN = VCC VIN = GND — 30 40 µA/ MHz/ Switch VIN = VCC VIN = GND — 6.0 8.0 mA VIN = 3.4 VIN = GND — 6.5 9.5 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, +25°C 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. 3474 tbl 06 SWITCHING CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial: TA =–40°C to +85°C, VCC = 5.0V ±10% 163383 Symbol tPLH tPHL tBX tPZH tPZL tPHZ tPLZ |QCI| |QCDI| Description Data Propagation Delay Ai to Ci, Di Bi to Ci, Di(3,4) Switch Multiplex Delay BX to Ai, Bi, Ci, Di Switch Turn on Delay BE to Ai, Bi, Ci, Di Switch Turn off Delay BE to Ai, Bi (3) Charge Injection, Typical(5,7) Charge Injection, 1632383 Condition(1) Min.(2) CL = 50pF RL = 500Ω — Typ. — 0.25 1.25 Unit ns 1.5 — 6.5 7.5 ns 1.5 — 6.5 7.5 ns 1.5 — 5.5 5.5 ns — 1.5 — — pC — 0.5 — — Typical(6,7) Max. 3474 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 MΩ scope probe, VIN = 0.0 volts. 6. Measured at switch turn off through bus multiplexer, (e.g.- A to C = >A to D), load = 50 pF in parallel with 10 MΩ scope probe, VIN at A = 0.0 volts. Charge injection is reduced because the injection from the turn off of the A to C switch is compensated by the turn on of the B to C switch. 7. Characterized parameter. Not 100% tested. 4 IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH COMMERCIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS TEST CIRCUITS FOR ALL OUTPUTS V CC SWITCH POSITION 500Ω Pulse Generator Switch Open Drain Disable Low Closed Enable Low V OUT VIN Test 7.0V Open All Other Tests D.U.T. 50pF RT 3474 lnk 08 DEFINITIONS: CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. 500Ω CL 3474 lnk 03 PULSE WIDTH SET-UP, HOLD AND RELEASE TIMES DATA INPUT tH tSU TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tREM tSU 3V 1.5V 0V 3V 1.5V 0V LOW-HIGH-LOW PULSE 1.5V tW 3V 1.5V 0V HIGH-LOW-HIGH PULSE 1.5V 3V 1.5V 0V tH 3474 lnk 05 3474 lnk 04 PROPAGATION DELAY ENABLE AND DISABLE TIMES ENABLE SAME PHASE INPUT TRANSITION tPLH tPHL OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL 3V 1.5V 0V DISABLE 3V 1.5V CONTROL INPUT OUTPUT NORMALLY LOW 3V 1.5V 0V SWITCH CLOSED 3.5V 1.5V tPZH OUTPUT NORMALLY HIGH 3474 lnk 06 SWITCH OPEN 0V tPLZ tPZL VOH 1.5V VOL 3.5V 0.3V VOL tPHZ 0.3V VOH 1.5V 0V 0V 3474 lnk 07 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 IDT74FST163383, IDT74FST1632383 20-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 (SO48-1) Thin Shrink Small Outline Package (SO48-2) Thin Very Small Outline Package (SO48-3) 163383 1632383 20-Bit Bus Exchange Switch 74 –40°C to +85°C 3474 drw 08 6