PI74LCX245 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Fast CMOS 3.3V 8-Bit Bidirectional Transceiver Product Features Product Description • Functionally compatible with FCT3, LVT, and 74 series 245 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) 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 PI74LCX245 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. Logic Block Diagram The PI74LCX245 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. Product Pin Configuration Product Pin Description Pin Name Description T/R OE A0 20-PIN H20 L20 Q20 S20 B0 A1 B1 A2 OE 3-State Output Enable Inputs (Active LOW) T/R Direction Control Input A0-A7 Side A Inputs or 3-State Outputs B0-B7 Side B Inputs or 3-State Outputs GND Ground VCC Power B2 A3 B3 A4 B4 Truth Table(1) Inputs (1) 1A5 B5 A6 B6 A7 B7 OE T/R Outputs (1) L L Bus B Data to Bus A L H Bus A Data to Bus B H X High State Z Note: 1. H = High Voltage Level, X = Don’t Care, L = Low Voltage Level, Z = High Impedance 1 PS2099A 02/13/97 PI74LCX245 3.3V 8-BIT BIDIRECTIONAL TRANSCEIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ............................................................–65°C to +150°C Ambient Temperature with Power Applied ........................... –40°C to +85°C 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 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. Power Dissipation ................................................................................... 1.0W Recommended Operating Conditions Symbol VCC Parameter Supply Voltage VI Input Voltage VO Output Voltage IOH/IOL TA ∆t/∆V Output Current Min. Max. Operating 2.0 3.6 Data Retention 1.5 3.6 0 5.5 HIGH or LOW State 0 VCC TRI-State 0 5.5 VCC = 3.0V-3.6V ±24 VCC = 2.7V ±12 −40 +85 °C 0 10 ns/V Free-Air Operating Temperature Input Edge Rate V = 0.8V-2.0V, VCC = 3.0V 2 Units V mA PS2099A 02/13/97 PI74LCX245 3.3V 8-BIT BIDIRECTIONAL TRANSCEIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 DC Electrical Characteristics (Over the Operating Range, TA = −40°C to +85°C, VCC = 2.7V to 3.6V) Parameters Description Test Conditions(1) Min. Typ(2) Max. VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 — — VIL Input LOW Voltage Guaranteed Logic LOW Level — — 0.8 VOH Output HIGH Voltage VCC = 2.7-3.6 IOH = –0.1mA VCC-0.2 — — VCC = 2.7 IOH = –12mA 2.2 — — VCC = 3.0 IOH = –18mA 2.4 — — IOH = –24mA 2.2 — — VCC = 2.7-3.6 IOL = 0.1mA — — 0.2 VCC = 2.7 IOL = 12mA — — 0.4 VCC = 3.0 IOL = 16mA — — 0.4 IOL = 24mA — — 0.55 — −0.7 −1.2 VOL Output LOW Voltage VIK Clamp Diode Voltage VCC = Min., IIN = –18mA II Input Leakage Current 0 ≤ VI ≤ 5.5V Vcc = 2.7-3.6 — — ±5 Tri-State Output Leakage 0 ≤ VO ≤ 5.5V VI = VIH or VIL VCC = 2.7-3.6 — — ±5 IOZ Units V 10 IOFF Power Down Disable VCC = 0V, VIN or VOUT ≤ 5.5V — — ±10 ICC Quiescent Power Supply Current VCC = Max. VIN = GND or VCC 0.1 10 ∆ICC Quiescent Power Supply Current TTL Inputs HIGH VCC = Max. VIN = VCC – 0.6V(3) 500 µA 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, +25°C ambient. 3. Per TTL driven input; all other inputs at Vcc or GND. Capacitance Parameters Description Test Conditions Input Capacitance VCC = Open, VI = 0V or VCC 7 COUT Output Capacitance VCC = 3.3V, VI = 0V or VCC 8 CPD Power Dissipation Capacitance VCC = 3.3V, VI = 0V or VCC, F = 10 MHz 25 CIN 3 Typical Units pF PS2099A 02/13/97 PI74LCX245 3.3V 8-BIT BIDIRECTIONAL TRANSCEIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Switching Characteristics over Operating Range VCC = 3.3V ± 0.3V Parameters VCC = 2.7V Description Conditions Min. Max. Min. Max. tPLH tPHL Propagation Delay DXX to OXX CL = 50pF RL = 500Ω 1.5 7.0 1.5 8.0 tPZH tPZL Output Enable time 1.5 8.5 1.5 9.5 tPHZ tPLZ Output Disable Time 1.5 7.5 1.5 8.5 Output Skew(1) 1.0 tSK(O) Units ns Notes: 1. Skew between any two outputs, of the same package, switching in the same direction. Dynamic Switching Characteristics (TA = +25°C) Description Test Conditions(1) VOLP Dynamic LOW Peak Voltage VCC = 3.3V, CL = 50pF VIH = 3.3V, VIL = 0V VOLV Dynamic LOW Valley Voltage VCC = 3.3V, CL = 50pF VIH = 3.3V, VIL = 0V Parameters Typ. Units 0.8 V 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 4 PS2099A 02/13/97