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PI74LPT2Q245
Fast CMOS 3.3V 8-Bit Bidirectional Transceiver
Product Features
* Compatible with LCXTM and LVTTM families of products * Supports 5V Tolerant Mixed Signal Mode Operation - Input can be 3V or 5V - Output can be 3V or connected to 5V bus * Advanced Low Power CMOS Operation * Excellent output drive capability: Balanced drives (12 mA sink and source) * 33 Series Resistors on all outputs * Low ground bounce outputs * Hysteresis on all inputs * Industrial operating temperature range: -40C to +85C * 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 PI74LPT series of logic circuits are produced in the Company's advanced 0.6 micron CMOS technology achieving high speed while maintaining low power operation. The PI74LPT2Q245 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 PI74LPT2Q245 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/R
Product Pin Configuration
Product Pin Description
Pin Name Description OE 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
OE A0 B0 A1 B1 A2 B2 A3 B3 A4 B4
1A5
20-PIN L20 Q20 R20 S20
T/R A0-A7 B0-B7 GND VCC
Truth Table(1)
Inputs(1) OE L
B6
B5 A6
T/R L H X
Outputs(1) Bus B Data to Bus A Bus A Data to Bus B High State Z
L H
A7 B7
Note: 1. H = High Voltage Level, X = Don't Care, L = Low Voltage Level, Z = High Impedance
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PI74LPT2Q245 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 ............................................................................ 120 mA 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 -- -- -- -- -- -- -- -- 150 Max. 5.5 5.5 0.8 1 1 1 1 1 1 -1.2 -60 60 -- -- 0.2 0.5 -100 100 -- Units V V V A A A A A A V mA mA V V V V mA A mV
VOL IOS IOFF VH
Output LOW Voltage Short Circuit Current(4) Power Down Disable Input Hysteresis
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) -20 (3) VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V 20 VCC = MIN. IOH = -0.1 mA Vcc -0.2 VIN = VIH or VIL VCC = 3.0V IOH = -8 mA 2.4(5) VIN = VIH or VIL VCC = Min. IOL = 0.1 mA -- VIN = VIH or VIL IOL = 8 mA -- VCC = Max.(3), VOUT GND -40 VCC = 0V, VIN or VOUT 4.5V -- --
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.
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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PI74LPT2Q245 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 50
Max. 10 30 75
Units A A A/ MHz
IC
Total Power Supply Current(6)
VIN = VCC - 0.6V VIN = GND
0.6
2.3
mA
VIN = VCC - 0.6V VIN = GND
2.1
4.7(5)
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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PI74LPT2Q245 3.3V 8-BIT BIDIRECTIONAL TRANSCEIVER
Switching Characteristics over Operating Range(1)
LPT2Q245 Com. Parameters Description tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ tSK(o) 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. 7.0 8.5 7.5 8.5 7.5 0.5 LPT2Q245A Com. Min.(3) 1.5 1.5 1.5 1.5 1.5 Max. 4.6 6.2 5.0 6.2 5.0 0.5 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 waveforms. 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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