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PI74LCX244
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Fast CMOS 3.3V 8-Bit Buffer/Line Driver Product Features
* Functionally compatible with FCT3, LVT, and 74 series 244 families of products * Tri-State outputs * 5V Tolerant inputs and outputs * 2.0V-3.6V VCC supply operation * Balanced sink and source output drives (24 mA) * Low ground bounce outputs * Supports live insertion * ESD Protection exceeds 2000V, Human Body Model 200V, Machine Model * Packages available: - 20-pin 209-mil wide plastic SSOP (H) - 20-pin 173-mil wide plastic TSSOP (L) - 20-pin 150-mil wide plastic QSOP (Q) - 20-pin 300-mil wide plastic SOIC (S)
Product Description
Pericom Semiconductor's PI74LCX 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 PI74LCX244 is an 8-bit non-inverting buffer/line driver designed for driving high capacitive memory loads. With its balanced-drive characteristics, this high-speed, low power device provides lower ground bounce, transmission line matching of signals, fewer line reflections and lower EMI and RFI effects. This makes it ideal for driving on-board buses and transmission lines. The PI74LCX244 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
Product Pin Configuration
OEA
Product Pin Description
Pin Name Description 3-State Output Enable Inputs (Active LOW) Inputs Outputs Ground Power OEA, OEB DXX OXX GND VCC
OEA OEB DA0
DA0 OB0 DA1 OB1
OA0
DA2 OB2
OB0
DB0 OA1
DA3 OB3
DA1 OB1
GND
1 20 2 19 3 20-Pin 18 4 H20 17 5 L20 16 Q20 15 6 S20 14 7 8 13 9 12 10 11
VCC OEB OA0 DB0 OA1 DB1 OA2 DB2 OA3 DB3
DB1 OA2
DA2 OB2
Truth Table(1)
Inputs Outputs DXX L H X OXX L H Z OEA L L OEB L L H
DB2 OA3
DA3 OB3
DB3
H
Note: 1. H = High Voltage Level, X = Don't Care, L = Low Voltage Level, Z = High Impedance
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PI74LCX244 3.3V 8-BIT BUFFER/LINE DRIVER
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.
Recommended Operating Conditions
Symbol VCC Parameter Supply Voltage Operating Data Retention VI VO Input Voltage Output Voltage HIGH or LOW State TRI-State IOH/IOL Output Current VCC = 3.0V-3.6V VCC = 2.7V TA Free-Air Operating Temperature Input Edge Rate V = 0.8V-2.0V, VCC = 3.0V Min. 2.0 1.5 0 0 0 -40 0 Max. 3.6 3.6 5.5 VCC 5.5 24 12 +85 10 mA C ns/V V Units
t/V
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PI74LCX244 3.3V 8-BIT BUFFER/LINE DRIVER
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC = 2.7V to 3.6V)
Parameters VIH VIL VOH Description Input HIGH Voltage Input LOW Voltage Output HIGH Voltage Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = 2.7-3.6 VCC = 2.7 VCC = 3.0 IOH = -0.1 mA IOH = -12 mA IOH = -18 mA IOH = -24 mA VOL Output LOW Voltage VCC = 2.7-3.6 VCC = 2.7 VCC = 3.0 IOL = 0.1 mA IOL = 12mA IOL = 16 mA IOL = 24 mA VIK II IOZ IOFF ICC Clamp Diode Voltage Input Leakage Current Tri-State Output Leakage Power Down Disable Quiescent Power Supply Current Quiescent Power Supply Current TTL Inputs HIGH VCC = Min., IIN = -18 mA 0 VI 5.5V 0 VO 5.5V VI = VIH or VIL Vcc = 2.7-3.6 VCC = 2.7-3.6 Min. 2.0 -- VCC-0.2 2.2 2.4 2.2 -- -- -- -- -- -- -- -- Typ(2) -- -- -- -- -- -- -- -- -- -- -0.7 -- -- -- 0.1 Max. -- 0.8 -- -- -- -- 0.2 0.4 0.4 0.55 -1.2 5 5 10 10 500 A V Units
VCC = 0V, VIN or VOUT 5.5V VCC = Max. VCC = Max. VIN = GND or VCC VIN = VCC - 0.6V(3)
ICC
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. 3. Per TTL driven input; all other inputs at Vcc or GND.
Capacitance
Parameters Description CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance Test Conditions VCC = Open, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC VCC = 3.3V, VI = 0V or VCC, F = 10 MHz Typ. 7 8 25 pF Units
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PI74LCX244 3.3V 8-BIT BUFFER/LINE DRIVER
Switching Characteristics over Operating Range
VCC = 3.3V 0.3V Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ tSK(O) Description Propagation Delay DXX to OXX Output Enable time Output Disable Time Output Skew(1) Conditions CL = 50 pF RL = 500 Min. 1.5 1.5 1.5 Max. 6.5 8.0 7.0 1.0 VCC = 2.7V Min. 1.5 1.5 1.5 Max. 7.5 9.0 ns 8.0 Units
Note: 1. Skew between any two outputs, of the same package, switching in the same direction.
Dynamic Switching Characteristics (TA = +25C)
Parameters VOLP VOLV Description Dynamic LOW Peak Voltage Dynamic LOW Valley Voltage Test Conditions(1) VCC = 3.3V, CL = 50 pF VIH = 3.3V, VIL = 0V 0.8 VCC = 3.3V, CL = 50 pF VIH = 3.3V, VIL = 0V V Typ. Units
Note: 1. Measured with n-1 outputs switching from High-to-Low or Low-to-High. The remaining output is measured in the LOW state.
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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