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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT3245
Fast CMOS 3.3V 8-Bit Bidirectional Transceiver
Product Features
* Advanced Low Power CMOS Operation * Compatible with LVC class of products * Compatible with industry standard octal pinouts * Excellent output drive capability: Balanced Drives (24 mA sink and source) * Can serve as a 5V to 3V translator * Inputs can be driven by 3.3V or 5V devices * Low ground bounce outputs * Hysteresis on all inputs * Industrial operating temperature range: -40 C to +85 C * Packages available: -20-pin 173 mil wide plastic TSSOP(L) -20-pin 150 mil wide plastic QSOP(Q) -20-pin 150 mil wide plastic TQSOP(R) -20-pin 300 mil wide plastic SOIC(S)
Product Description
Pericom Semiconductor's PI74FCT3 series of logic circuits are produced in the Company's advanced 0.6 micron CMOS technology, achieving industry leading speed grades. The PI74FCT3245 is an 8-bit bidirectional transceiver designed for asynchronous two-way communication between data buses. The transmit/receive input pin (T/R) determines the direction of data flow through the bidirectional transceiver. Transmit (active HIGH) enables data from A ports to B ports, and receive (active LOW) from B ports to A ports. The output enable (OE) input, when HIGH, disables both A and B ports by placing them in HIGH Z condition. The PI74FCT3245 can be driven from either 3.3V or 5.0V devices allowing this device to be used as a translator in a mixed 3.3V/5.0V system.
Logic Block Diagram
T/ OE A0 B0 A1 B1 A2 B2 A3 B3 A4 B4
1A5
Product Pin Configuration
T/R A0 A1 A2 A3 A4 A5 A6 A7 GND 20 1 19 2 20-PIN 18 3 L20 4 Q20 17 5 R20 16 6 S20 15 14 7 13 8 12 9 11 10 VCC OE B0 B1 B2 B3 B4 B5 B6 B7
Product Pin Description
Pin Name OE T/R A7-A0 B7-B0 GND VCC Description 3-State Output Enable Inputs (Active LOW) Direction Control Input Side A Inputs or 3-State Outputs Side B Inputs or 3-State Outputs Ground Power
Truth Table
Inputs(1) OE L L H T/R L H X Outputs(1) Bus B Data to Bus A Bus A Data to Bus B High StateZ
B5 A6 B6 A7 B7
Note: 1. H = High Voltage Level, X = Don't Care, L = Low Voltage Level, Z = High Impedance
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PS7068C
8/22/97
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT3245 3.3V 8-BIT BIDIRECTIONAL TRANSCEIVER
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature .................................................................. -65C to +150C Ambient Temperature with Power Applied ................................. -40C to +85C Supply Voltage to Ground Potential (Inputs & Vcc Only) ........... -0.5V to +7.0V Supply Voltage to Ground Potential (Outputs & D/O Only) ....... -0.5V to +7.0V DC Input Voltage ......................................................................... -0.5V to +7.0V DC Output Current .................................................................................... 120mA Power Dissipation ......................................................................................... 1.0W Note: Stresses greater than those listed under 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.
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC = 2.7V to 3.6V)
Parameters VIH VIL IIH IIL IOZH IOZL VIK IODH IODL VOH Description Input HIGH Voltage (Input pins) Input HIGH Voltage (I/O pins) Input LOW Voltage (Input and I/O pins) Input HIGH Current (Input pins) Input HIGH Current (I/O pins) Input LOW Current (Input pins) Input LOW Current (I/O pins) High Impedance Output Current (3-State Output pins) Clamp Diode Voltage Output HIGH Current Output LOW Current Output HIGH Voltage Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level Min. 2.2 2.0 -0.5 Typ.(2) -- -- -- -- -- -- -- -- -- -0.7 -60 90 -- 3.0 3.0 -- -- 0.2 0.3 -85 -- 150 Max. 5.5 5.5 0.8 1 1 1 1 1 1 -1.2 -110 200 -- -- -- -- 0.2 0.4 0.5 -240 100 -- Units V V V A A A A A A V mA mA V V V V V V mA A mV
VOL
Output LOW Voltage
IOS Short Circuit Current(4) IOFF Power Down Disable VH Input Hysteresis Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at Vcc = 3.3V, +25C ambient and maximum loading. 3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second. 4. This parameter is guaranteed but not tested. 5. VOH = VCC - 0.6V at rated current.
VCC = Max. VIN = 5.5V -- VCC = Max. VIN = VCC -- VCC = Max. VIN = GND -- VCC = Max. VIN = GND -- VCC = Max. VOUT = 5.5V -- VCC = Max. VOUT = GND -- VCC = Min., IIN = -18 mA -- VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V(3) -36 VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V(3) 50 VCC = Min. IOH = -0.1 mA Vcc-0.2 VIN = VIH or VIL IOH = -3 mA 2.4 VCC = 3.0V, IOH = -8 mA 2.4(5) VIN = VIH or VIL IOH = -24 mA 2.0 VCC = Min. IOL = 0.1 mA -- VIN = VIH or VIL IOL = 16 mA -- IOL = 24 mA -- VCC = Max.(3), VOUT = GND -60 VCC = 0V, VIN or VOUT 4.5V -- --
Capacitance (TA = 25C, f = 1 MHz)
Parameters(1) CIN COUT Description Input Capacitance Output Capacitance Test Conditions VIN = 0V VOUT = 0V Typ. 4.5 5.5 Max. 6 8 Units pF pF
Note: 1. This parameter is determined by device characterization but is not production tested.
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PS7068C 8/22/97
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT3245 3.3V 8-BIT BIDIRECTIONAL TRANSCEIVER
Power Supply Characteristics
Parameters Description ICC ICC ICCD Quiescent Power Supply Current Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply(4) Test Conditions(1) VCC = Max. VCC = Max. VCC = Max., Outputs Open OE = GND One Bit Toggling 50% Duty Cycle VCC = Max., Outputs Open fI = 10 MHZ 50% Duty Cycle OE = GND One Bit Toggling VCC = Max., Outputs Open fI = 2.5 MHZ 50% Duty Cycle OE = GND 8 Bits Toggling VIN = GND or VCC VIN = VCC - 0.6V VIN = VCC VIN = GND
(3)
Min.
Typ.(2) 0.1 2.0 95
Max. 10 30 100
Units A A A/ MHz
1 2 3 4 5
IC
Total Power Supply Current(6)
VIN = VCC - 0.6V VIN = GND
0.97
2.3
mA
VIN = VCC - 0.6V VIN = GND
1.9
4.7(5)
6 7 8 9 10 11 12 13 14 15
Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at Vcc = 3.3V, +25C ambient. 3. Per TTL driven input; 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 (ICCL, ICCH and ICCZ) ICC = Power Supply Current for a TTL High Input 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) fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices) NCP = Number of Clock Inputs at fCP fI = Input Frequency NI = Number of Inputs at fI All currents are in milliamps and all frequencies are in megahertz.
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PS7068C
8/22/97
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT3245 3.3V 8-BIT BIDIRECTIONAL TRANSCEIVER
Switching Characteristics over Operating Range(1)
FCT3245 Com. Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ tSK(o) Description Propagation Delay A to B, B to A Output Enable Time OE to A or B Output Disable Time(4) OE to A or B Output Enable Time T/R to A or B Output Disable Time(4) T/R to A or B Output Skew(5) Conditions(2) CL = 50 pF RL = 500 Min.(3) 1.5 1.5 1.5 1.5 1.5 Max. 4.1 5.8 4.8 5.8 4.8 0.5 Units ns ns ns ns ns ns
Notes: 1. Propagation Delays and Enable/Disable times are with VCC = 3.3V 0.3V, normal range. For VCC = 2.7V, extended range, all Propagation Delays and Enable/Disable times should be degraded by 20%. 2. See test circuit and wave forms. 3. Minimum limits are guaranteed but not tested on Propagation Delays. 4. This parameter is guaranteed but not production tested. 5. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
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PS7068C 8/22/97

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