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| IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) FEATURES: * * * * IDT74FCT621T/AT Std. and A grades Low input and output leakage 1A (max.) CMOS power levels True TTL input and output compatibility: - VOH = 3.3V (typ.) - VOL = 0.3V (typ.) * Meets or exceeds JEDEC standard 18 specifications * Power off disable outputs permit "live insertion" * Available in SOIC package DESCRIPTION: The IDT74FCT621T is an octal transceiver with non-inverting OpenDrain bus compatible outputs in both send and receive directions. The B bus outputs are capable of sinking 64mA providing very good capacitive drive characteristics. These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation allows for maximum flexibility in timing. FUNCTIONAL BLOCK DIAGRAM GBA GAB 19 1 A1 2 18 B1 A2-A8 B2-B8 SEVEN OTH ER T RANSC EIVERS The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE 1 AUGUST 2000 DSC-2538/7 (c) 2000 Integrated Device Technology, Inc. IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS(1) Symbol VTERM(2) VTERM(3) TSTG IOUT Description Terminal Voltage with Respect to GND Terminal Voltage with Respect to GND Storage Temperature DC Output Current Max -0.5 to +7 -0.5 to VCC+0.5 -65 to +150 -60 to +120 Unit V V C mA GAB A1 A2 A3 A4 A5 A6 A7 A8 GND 1 2 3 4 5 6 7 8 9 10 SO20-2 20 19 18 17 16 15 14 13 12 11 VCC GBA B1 B2 B3 B4 B5 B6 B7 B8 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. No terminal voltage may exceed Vcc by +0.5V unless otherwise noted. 2. Inputs and Vcc terminals only. 3. Output and I/O terminals only. CAPACITANCE (TA = +25C, F = 1.0MHz) Symbol CIN COUT Parameter(1) Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Typ. 6 8 Max. 10 12 Unit pF pF SOIC TOP VIEW NOTE: 1. This parameter is measured at characterization but not tested. PIN DESCRIPTION Pin Names GBA, GAB A1 - A8 B1 - B8 Enable Inputs A Inputs or Open-drain Outputs B Inputs or Open-drain Outputs Description FUNCTION TABLE(1) Enable Inputs GBA L H H L GAB L H L H Function B data to A bus A data to B bus OFF B data to A bus A data to B bus NOTE: 1. H = HIGH Voltage Level. L = LOW Voltage Level. OFF = HIGH if pull-up resistor is connected to Open-Drain output. 2 IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 5% Symbol VIH VIL IIH IIL II VIK IOH VOL VOL IOFF VH ICC Parameter Input HIGH Level Input LOW Level Input HIGH Current Input HIGH Current (4) Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VI = 2.7V VCC = Max., VI = 0.5V VCC = Max., VI = VCC (Max.) VCC = Min., IN= -18mA VCC = Max. VIN = VIH or VIL VCC = Min. VIN = VIH or VIL VCC = Min. VIN = VIH or VIL VCC = 0V, VIN or VO - 4.5V -- VCC = max., VIN = GND or Vcc VOH = Vcc (Max.) IOL = 64mA (3) IOL = 48mA (3) Min. 2 -- -- -- -- -- -- -- -- -- -- -- Typ.(2) -- -- -- -- -- -0.7 -- 0.3 0.3 -- 200 0.01 Max. -- 0.8 1 1 1 -1.2 20 0.55 0.5 1 -- 1 Unit V V A A A V A V V A mV mA Input LOW Current(4) (4) Clamp Diode Voltage Output HIGH Current Output LOW Voltage (B Bus) Output LOW Voltage (A Bus) Input/Output Power Off Leakage(4) Input Hysteresis Quiescent Power Supply Current 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. These are maximum IOL values per output, for 8 outputs turned on simultaneously. Total maximum IOL (all outputs) is 512mA for commercial and 384mA for military. Derate IOL for number of outputs exceeding 8 turned on simultaneously. 4. The test limit for this parameter is 5A at TA = -55C. 3 IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) VCC = Max. VIN = 3.4V(3) Vcc = Max. Outputs Open GBA = GAB = GND or VCC One Input Toggling 50% Duty Cycle Vcc = Max. Outputs Open GBA = GAB = GND or VCC One Bit Toggling at fi =10MHz 50% Duty Cycle Vcc = Max. Outputs Open GBA = GAB = GND or VCC Eight Bits Toggling at fi = 2.5MHz 50% Duty Cycle VIN = VCC VIN = GND Test Conditions(1) Min. -- -- Typ.(2) 0.5 0.15 Max. 2 0.25 Unit mA mA/MHz IC Total Power Supply Current(6,7) VIN = VCC VIN = GND VIN = 3.4V VIN = GND VIN = VCC VIN = GND VIN = 3.4V VIN = GND -- -- 1.5 1.8 3.5 4.5 mA -- -- 3 5 6(5) 14(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, +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 (fCP/2 + fiNi) 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 Output Transition Pair (HLH or LHL) fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices) fi = Input Frequency Ni = Number of Inputs at fi All currents are in milliamps and all frequencies are in megahertz. 7. This test is performed with outputs tied to GND through a pull-down resistor. SWITCHING CHARACTERISTICS OVER OPERATING RANGE IDT74FCT621T Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL NOTES: 1. See test circuit and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delays. IDT74FCT621AT Max. 13 8.5 12.5 8 14 8.5 14 8 Min.(2) 5.5 1.5 5.5 1.5 5.5 1.5 5.5 1.5 Max. 12 6.8 12 6.4 13 6.8 13 6.4 ns ns ns Parameter Propagation Delay, A to B Propagation Delay, B to A Propagation Delay, GBA to A Propagation Delay, GAB to B Condition(1) CL = 50pF RL = 500 Min.(2) 5.5 1.5 5.5 1.5 5.5 1.5 5.5 1.5 Unit ns 4 IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS V CC 7.0V 500 VIN Pulse G enerator D.U.T. 50pF RT 500 C L SWITCH POSITION Test Switch Closed Open Open Drain Disable Low Enable Low All Other Tests V O UT DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. Octal link Test Circuits for All Outputs DATA INPUT tSU TIMING INPUT ASYNCHRO NOUS CONTROL PRESET CLEAR ETC. SYNCHRON OUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tREM tH 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V Octal link LOW -HIGH-LOW PULSE tW HIG H-LOW -HIGH PULSE Octal link 1.5V 1.5V tSU tH Pulse Width Set-Up, Hold, and Release Times ENABLE SAM E PHASE INPUT TRANSITIO N tPLH O UTPUT tPLH OPPOSITE PHASE INPUT TRANSITIO N tPHL tPHL 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V Octal link DISABLE 3V CONTRO L INPUT tPZL OUTPUT NO RMALLY LOW SW ITCH CLOSED tPZH OUTPUT NO RMALLY HIGH SW ITCH OPEN 3.5V 1.5V 0.3V tPHZ 0.3V 1.5V 0V tPLZ 1.5V 0V 3.5V VOL VOH 0V Octal link Propagation Delay Enable and Disable Times NOTES: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns. 5 IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XX FCT X DeviceType X Package Temperature Range SO Small Outline IC (SO20-2) 621T Octal Bus Transceiver (Open Drain) 621AT 74 - 40C to +85C 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 for Tech Support: logichelp@idt.com (408) 654-6459 6 |
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