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PI74FCT245T/640T/645T PI74FCT2245T/2640T/2645T (25 Series)
Fast CMOS Octal Bidirectional Transceivers
Product Features
PI74FCT245/640/645T and PI74FCT2245/2640T/2645T are pin compatible with bipolar FAST Series at a higher speed and lower power consumption 25 Ohm series resistor on all outputs (FCT2XXX only) TTL input and output levels Low ground bounce outputs Extremely low static power Hysteresis on all inputs Industrial operating temperature range: 40C to +85C Packages available: 20-pin 173 mil wide plastic TSSOP (L) 20-pin 300 mil wide plastic DIP (P) 20-pin 150 mil wide plastic QSOP (Q) 20-pin 150 mil wide plastic TQSOP (R) 20-pin 300 mil wide plastic SOIC (S) 20-pin 209 mil wide plastic SSOP (H) Device models available on request
Product Description
Pericom Semiconductors PI74FCT series of logic circuits are produced using the Companys advanced 0.6/0.8 micron CMOS technology, achieving industry leading speed grades. All PI74FCT2XXX devices have a built-in 25 Ohm series resistor on all outputs to reduce noise because of reflections, thus eliminating the need for an external terminating resistor. The PI74FCT245T/640T/645T and PI74FCT2245T/2640T/2645T are 8-bit wide octal buffer bidirectional transceivers designed for asynchronous two-way communication between data buses. The transmit/receive (T/R) input 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.
Product Pin Configuration
T/R A0 A1 A2 A3 A4 A5 A6 A7 GND
1 20 2 19 3 18 4 20-Pin 17 5 L,P,Q 16 6 R,S,H 15 7 14 8 13 9 12 10 11
Logic Block Diagram
T/R OE A0 B0 A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7
Vcc OE B0 B1 B2 B3 B4 B5 B6 B7
Product Pin Description
Pin Name OE T/R A0-A7 B0-B7 GND VCC Description 3-State Output Enable Inputs (Active LOW) Transmit/Receive Input Side A Inputs or 3-State Outputs Side B Inputs or 3-State Outputs Ground Power
Truth Table(1)
Inputs OE T/R L L L H H X
1. 2. 1
Outputs Bus B Data to Bus A(2) Bus A Data to Bus B(2) High Z State
FCT245, 2245, 645, 2645 are non-inverting options. FCT640 & FCT2640 are inverting options.
H = High Voltage Level, X = Don't Care, L = Low Voltage Level, Z = High Impedance 640 is inverting from input to output.
PS2012B 09/22/99
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PI74FCT245T/640T/645T 25 Ohm Series PI74FCT2245T/2640T/2645T Octal BidirectionalTransceivers
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 ..........................................................................................0.5W
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 = 5.0V 5%)
Parameters Description VOH VOL VOL VIH VIL IIH IIL IIH IIL IOZH IOZL VIK IOFF IOS VH Output HIGH Voltage Output LOW Current Output LOW Current Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Power Down Disable Short Circuit Current Input Hysteresis VCC = Min., IIN = -18 mA VCC = GND, VOUT = 4.5V VCC = Max.(3), VOUT = GND -- -60 Test Conditions(1) VCC = Min., VIN = VIH or VIL VCC = Min., VIN = VIH or VIL VCC = Min., VIN = VIH or VIL Guaranteed Logic HIGH Level Guaranteed Logic LOW Level (Except I/O pins) VCC = Max. (Except I/O pins) VCC = Max. (I/O pins Only) VCC = Max. (I/O pins Only) VCC = Max. VCC = MAX. VIN = VCC VIN = GND VIN = VCC VIN = GND VOUT = 2.7V VOUT = 0.5V -0.7 -- -120 200 IOH = -15.0mA IOL = 64mA IOL = 12mA (25 Series) 2.0 0.8 1 -1 1 -1 1 -1 -1.2 100 Min. Typ(2) Max. Units 2.4 3.0 0.3 0.3 0.55 0.50 V V V V V A A A A A A V A mA mV
Capacitance (TA = 25C, f = 1 MHz)
Parameters(4) CIN C OUT Description Input Capacitance Output Capacitance Test Conditions VIN = 0V VOUT = 0V Typ. 6 8 Max. 10 12 Units pF pF
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 = 5.0V, +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 determined by device characterization but is not production tested.
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PS2012B
09/22/99
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PI74FCT245T/640T/645T 25 Ohm Series PI74FCT2245T/2640T/2645T Octal BidirectionalTransceivers
Power Supply Characteristics
Parameters Description ICC ICC ICCD Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Supply Current per Input per MHz(4) VCC = Max. VCC = Max., VCC = Max., Outputs Open OE = GND T/R = GND or VCC One Input Toggling 50% Duty Cycle VCC = Max., Outputs Open fI = 10 MHZ 50% Duty Cycle T/R = OE = GND One Bit Toggling VCC = Max., Outputs Open fI = 2.5 MHZ 50% Duty Cycle T/R = OE = GND Eight Bits Toggling Test Conditions(1) VIN = GND or VCC VIN = 3.4V(3) VIN = VCC VIN = GND Min. Typ(2) 0.1 0.5 0.15 Max. 500 2.0 0.25 Units A mA mA/ MHz
IC
Total Power Supply Current(6)
VIN = VCC VIN = GND VIN = 3.4V VIN = GND VIN = VCC VIN = GND VIN = 3.4V VIN = GND
1.5 1.8
3.5(5) 4.5(5) 6.0(5) 14.0(5)
mA
3.0 5.0
Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device. 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 + DICC 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 Input 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.
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PS2012B
09/22/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T/640T/645T 25 Ohm Series PI74FCT2245T/2640T/2645T Octal BidirectionalTransceivers
PI74FCT245T/2245T Switching Characteristics over Operating Range
245T/2245T Com. Min. Max. 1.5 1.5 1.5 1.5 1.5 7.0 9.0 7.5 9.0 7.5 245AT/2245AT 245CT/2245CT Com. Com. Min. Max. Min. Max. 1.5 1.5 1.5 1.5 1.5 4.6 6.2 5.0 6.2 5.0 1.5 1.5 1.5 1.5 1.5 4.1 5.8 4.8 5.8 4.8 245DT Com. Min Max. Unit 1.5 1.5 1.5 1.5 1.5 3.8 5.0 4.3 5.0 4.3 ns ns ns ns ns
Parameters Description t PLH t PHL t PZH t PZL t PHZ t PLZ t PZH t PZL t PHZ t PLZ Propagation Delay A to B, B to A Output Enable Time OE to A or B Output Disable Time OE to A or B(3) Output Enable Time T/R to A or B Output Disable Time(3) T/R to A or B(3)
Conditions(1) CL = 50 pF RL = 500 Ohm
PI74FCT640T/2640T Switching Characteristics over Operating Range
640T/2640T Com. Min. Max. 2.0 2.0 2.0 2.0 2.0 7.0 13.0 10.0 13.0 10.0 640AT/2640AT 640CT/2640CT Com. Com. Min. Max. Min. Max. 1.5 1.5 1.5 1.5 1.5 5.0 6.2 5.0 6.2 5.0 1.5 1.5 1.5 1.5 1.5 4.4 5.8 4.8 5.8 4.8 640DT Com. Min. Max. Unit 1.5 1.5 1.5 1.5 1.5 3.7 5.0 4.3 5.0 4.3 ns ns ns ns ns
Parameters Description t PLH t PHL t PZH t PZL t PHZ t PLZ t PZH t PZL t PHZ t PLZ Propagation Delay A to B, B to A Output Enable Time OE to A or B Output Disable Time OE to A or B(3) Output Enable Time T/R to A or B Output Disable Time(3) T/R to A or B(3)
Conditions(1) CL = 50 pF RL = 500 Ohm
PI74FCT645T/2645T Switching Characteristics over Operating Range 645T/2645T Com. Min. Max. 1.5 1.5 1.5 1.5 1.5 9.5 11.0 12.0 11.0 12.0 645AT/2645AT 645CT/2645CT Com. Com. Min. Max. Min. Max. 1.5 1.5 1.5 1.5 1.5 4.6 6.2 5.0 6.2 5.0 1.5 1.5 1.5 1.5 1.5 4.1 5.8 4.8 5.8 4.8 645DT Com. Min. Max. Unit 1.5 1.5 1.5 1.5 1.5 3.8 5.0 4.3 5.0 4.3 ns ns ns ns ns
Parameters Description t PLH t PHL t PZH t PZL t PHZ t PLZ t PZH t PZL t PHZ t PLZ Propagation Delay A to B, B to A Output Enable Time OE to A or B Output Disable Time OE to A or B(3) Output Enable Time T/R to A or B Output Disable Time(3) T/R to A or B(3)
Conditions(1) CL = 50 pF RL = 500 Ohm
Notes: 1. See test circuit and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delays. 3. This parameter is guaranteed but not production tested.
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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PS2012B 09/22/99

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