IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) IDT74FCT621T/AT FEATURES: 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. Std. and A grades Low input and output leakage ≤1µA (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 FUNCTIONAL BLOCK DIAGRAM GBA GAB A1 19 1 2 18 A2-A8 B1 B2-B8 SEVEN OTHER TRANSCEIVERS The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE JUNE 2006 1 © 2006 Integrated Device Technology, Inc. DSC-2538/10 IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS(1) PIN CONFIGURATION Symbol Description VTERM(2) Max Unit Terminal Voltage with Respect to GND –0.5 to +7 V Terminal Voltage with Respect to GND –0.5 to VCC+0.5 V GAB 1 20 VCC VTERM(3) TSTG Storage Temperature –65 to +150 °C A1 2 19 GBA IOUT DC Output Current –60 to +120 mA A2 3 18 B1 A3 4 17 B2 A4 5 16 B3 A5 6 15 B4 A6 7 14 B5 A7 8 13 B6 A8 9 12 B7 10 11 B8 GND 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 = +25°C, F = 1.0MHz) Parameter(1) Symbol Conditions Typ. Max. CIN Input Capacitance VIN = 0V 6 10 pF COUT Output Capacitance VOUT = 0V 8 12 pF NOTE: 1. This parameter is measured at characterization but not tested. SOIC TOP VIEW PIN DESCRIPTION Pin Names GBA, GAB Description Enable Inputs A1 – A8 A Inputs or Open-drain Outputs B1 – B8 B Inputs or Open-drain Outputs 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 Unit 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 = –40°C to +85°C, VCC = 5.0V ±5% Symbol Test Conditions(1) Min. Typ.(2) Max. Unit Guaranteed Logic HIGH Level 2 — — V Guaranteed Logic LOW Level — — 0.8 V VCC = Max., VI = 2.7V — — ±1 µA VCC = Max., VI = 0.5V — — ±1 µA VCC = Max., VI = VCC (Max.) — — ±1 µA — –0.7 –1.2 V Parameter VIH Input HIGH Level VIL Input LOW Level (4) IIH Input HIGH Current IIL Input LOW Current(4) (4) II Input HIGH Current VIK Clamp Diode Voltage VCC = Min., IN= –18mA IOH Output HIGH Current VCC = Max. VIN = VIH or VIL VOH = Vcc (Max.) — — 20 µA VOL Output LOW Voltage (B Bus) VCC = Min. VIN = VIH or VIL IOL = 64mA (3) — 0.3 0.55 V VOL Output LOW Voltage (A Bus) VCC = Min. VIN = VIH or VIL IOL = 48mA (3) — 0.3 0.5 V I OFF Input/Output Power Off Leakage(4) VCC = 0V, VIN or VO - 4.5V — — ±1 µA VH Input Hysteresis — — 200 — mV ICC Quiescent Power Supply Current VCC = max., VIN = GND or Vcc — 0.01 1 mA 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. 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 ±5µA at TA = –55°C. 3 IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE POWER SUPPLY CHARACTERISTICS Symbol Test Conditions(1) Parameter Min. Typ.(2) Max. Unit — 0.5 2 mA ΔICC Quiescent Power Supply Current TTL Inputs HIGH VCC = Max. VIN = 3.4V(3) ICCD Dynamic Power Supply Current(4) Vcc = Max. Outputs Open GBA = GAB = GND or VCC One Input Toggling 50% Duty Cycle VIN = VCC VIN = GND — 0.15 0.25 mA/MHz IC Total Power Supply Current(6,7) Vcc = Max. Outputs Open GBA = GAB = GND or VCC One Bit Toggling at fi =10MHz 50% Duty Cycle VIN = VCC VIN = GND — 1.5 3.5 mA VIN = 3.4V VIN = GND — 1.8 4.5 VIN = VCC VIN = GND — 3 6(5) VIN = 3.4V VIN = GND — 5 14(5) Vcc = Max. Outputs Open GBA = GAB = GND or VCC Eight Bits Toggling at fi = 2.5MHz 50% Duty Cycle 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 + ΔICC DHNT + ICCD (fCP/2 + fiNi) ICC = Quiescent Current ΔICC = 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 Min.(2) CL = 50pF 5.5 RL = 500Ω Max. Max. Unit 13 5.5 12 ns 1.5 8.5 1.5 6.8 Propagation Delay, B to A 5.5 12.5 5.5 12 1.5 8 1.5 6.4 Propagation Delay, GBA to A 5.5 14 5.5 13 1.5 8.5 1.5 6.8 5.5 14 5.5 13 1.5 8 1.5 6.4 Parameter Propagation Delay, A to B tPHL tPLH tPHL tPLH IDT74FCT621AT Min.(2) tPHL tPLH Condition(1) Propagation Delay, GAB to B tPHL NOTES: 1. See test circuit and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delays. 4 ns ns ns IDT74FCT621T/AT FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN) INDUSTRIAL TEMPERATURE RANGE TEST CIRCUITS AND WAVEFORMS V CC SWITCH POSITION 7.0V 500W V OUT VIN Pulse Generator D.U.T . 50pF RT Test Switch Open Drain Disable Low Enable Low Closed All Other Tests Open 500W DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. CL Octal Link Test Circuits for All Outputs 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 Pulse Width Octal Link Octal Link Set-Up, Hold, and Release Times ENABLE SAME PHASE INPUT TRANSITION tPLH tPHL OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL 3V 1.5V 0V VOH 1.5V VOL DISABLE 3V CONTROL INPUT tPZL OUTPUT NORMALLY LOW 3V 1.5V 0V SWITCH CLOSED tPLZ 3.5V 1.5V tPZH OUTPUT NORMALLY HIGH SWITCH OPEN 1.5V 0V 3.5V 0.3V VOL tPHZ 0.3V VOH 1.5V 0V Octal Link 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 Temperature Range FCT X X Device Type Package SOG Small Outline IC - Green 621T Octal Bus Transceiver (Open Drain) 621AT 74 CORPORATE HEADQUARTERS 6024 Silver Creek Valley Road San Jose, CA 95138 - 40°C to +85°C for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com 6 for Tech Support: [email protected]