PI74FCT162244MT 16-BIT HEAVY BUFFER/LINE DRIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 PI74FCT162244MT 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Fast CMOS 16-Bit Heavy Buffer/Line Drivers Product Features: Product Description: • Very high-speed buffer drivers for 150 pF heavy load and all 16-bit switching in 4.8ns max • Meets JEDEC specification for DRAM DIMM module buffer propagation delay • Low noise drivers: minimal undershoot/ringback and typical VOLP (output ground bounce) < 0.6V • Packages available: – 48-pin 240-mil wide plastic TSSOP (A) – 48-pin 300-mil wide plastic SSOP (V) Pericom Semiconductor’s PI74FCT series of logic circuits are produced in the Company’s advanced CMOS technology, achieving industry leading speed grades. The PI74FCT162244MT is a non-inverting 16-bit buffer/line driver designed specifically for applications driving heavy loads—ideally for DRAM modules/arrays and heavy load bus applications. This very high-speed, high-drive, low noise buffer driver device meets the JEDEC specification for DRAM DIMM module buffer drivers. The PI74FCT162244MT offers a flow-through organization for ease of board layout. This part is plug-in compatible with the 74ABT16244/162244 and excels in applications where much higher speed and lower power dissipation are required. The output drivers of the PI74FCT162244MT have the features of a balanced drive and controlled edge rate, resulting in minimal undershoot/ringback and ground bounce. This eliminates the need for external series termination resistors. Logic Block Diagram 1OE 3OE 1A0 1Y0 3A0 3Y0 1A1 1Y1 3A1 3Y1 1A2 1Y2 3A2 3Y2 1A3 1Y3 3A3 3Y3 2OE 4OE 2A0 2Y0 4A0 4Y0 2A1 2Y1 4A1 4Y1 2A2 2Y2 4A2 4Y2 2A3 2Y3 4A3 4Y3 1 PS2043A 03/12/96 PI74FCT162244MT 16-BIT HEAVY BUFFER/LINE DRIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Product Pin Description Pin Name xOE xAx xYx GND VCC Truth Table Inputs(1) Description 3-State Output Enable Inputs (Active LOW) Inputs 3-State Outputs Ground Power XOE L L H Note: 1. H X L Z xAx L H X Outputs(1) xYx L H Z = High Voltage Level = Don’t Care = Low Voltage Level = High Impedance Product Pin Configuration 1OE 1 48 1Y0 2 47 2OE 1A0 1Y1 3 46 1A1 GND 4 45 GND 1Y2 5 44 1A2 1Y3 6 43 1A3 VCC 7 42 VCC 2Y0 8 41 2A0 2Y1 9 40 2A1 GND 10 39 GND 2Y2 11 2Y3 12 3Y0 13 3Y1 14 GND 48-PIN V48 A48 38 2D2 37 2A3 36 3A0 35 3A1 15 34 GND 3Y2 16 33 3A2 3Y3 17 32 3A3 VCC 18 31 VCC 4Y0 19 30 4A0 4Y1 20 29 4A1 GND 21 28 GND 4Y2 22 27 4A2 4Y3 23 26 4A3 4OE 24 25 3OE 2 PS2043A 03/12/96 PI74FCT162244MT 16-BIT HEAVY BUFFER/LINE DRIVER 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 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 = –40°C to +85°C, VCC = 5.0V ± 10%) Test Conditions(1) Parameters Description VIH VIL IIH IIL IOZH IOZL VIK IOS IO VH Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Short Circuit Current Output Drive Current Input Hysteresis Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max. VCC = Max. VCC = Max. VCC = Max. VCC = Min., IIN = –18 mA VCC = Max.(3), VOUT = GND VCC = Max.(3), VOUT = 2.5V Min. Typ(2) Max. Units 0.8 1 –1 1 –1 –1.2 –200 –180 V V µA µA µA µA V mA mA mV 2.0 VIN = VCC VIN = GND VOUT = 2.7V VOUT = 0.5V –0.7 –140 –80 –50 100 Output Drive Characteristics (Over the Operating Range) Test Conditions(1) Parameters Description VOH VOL IODL IODH Output HIGH Voltage Output LOW Voltage Output LOW Current Output HIGH Current VCC = Min., VIN = VIH or VIL IOH = –24.0 mA VCC = Min., VIN = VIH or VIL IOL = 24 mA VCC = 5V, VIN = VIH OR VIL, VOUT = 1.5V(3) VCC = 5V, VIN = VIH OR VIL, VOUT = 1.5V(3) Min. Typ(2) Max. Units 2.4 3.3 0.3 115 –115 0.55 150 –150 V V mA mA 60 –60 Capacitance (TA = 25°C, f = 1 MHz) Parameters(4) CIN COUT Description Test Conditions Typ Max. Units Input Capacitance Output Capacitance VIN = 0V VOUT = 0V 4.5 5.5 6 8 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, +25°C 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. 3 PS2043A 03/12/96 PI74FCT162244MT 16-BIT HEAVY BUFFER/LINE DRIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Power Supply Characteristics Parameters Description Test Conditions(1) Min. Typ(2) Max. Units ICC Quiescent Power Supply Current VCC = Max. VIN = GND or VCC 0.1 500 µA ∆ICC Supply Current per Input @ TTL HIGH VCC = Max. VIN = 3.4V(3) 0.5 1.5 mA ICCD Supply Current per Input per MHz(4) VCC = Max., Outputs Open XOE = GND One Bit Toggling 50% Duty Cycle VIN = VCC VIN = GND 60 100 µA/ MHz IC Total Power Supply Current(6) VCC = Max., Outputs Open fI = 10 MHZ 50% Duty Cycle XOE = GND One Bit Toggling VIN = VCC VIN = GND 0.6 1.5(5) mA VIN = 3.4V VIN = GND 0.9 2.3(5) VIN = VCC VIN = GND 2.4 4.5(5) VIN = 3.4V VIN = GND 6.4 16.5(5) VCC = Max., Outputs Open fI = 2.5 MHZ 50% Duty Cycle XOE = GND 16 Bits Toggling 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, +25°C 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 + ∆ICC 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. 4 PS2043A 03/12/96 PI74FCT162244MT 16-BIT HEAVY BUFFER/LINE DRIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Switching Characteristics over Operating Range - High-LoadCondition Parameters Description tPLH tPHL tPZH tPZL Propagation Delay(2) XAX to XYX Output Enable Time XOE to XAX or XYX tPHZ tPLZ tSK(o) Conditions(1) 162244MT Com. Min Max Unit CL = 150 pF 1.5 All 16 Bits Switching CL = 50 pF 1.5 RL = 500Ω 4.8 ns 6.2 ns Output Disable Time(3) XOE to XAX or XYX 1.5 5.6 ns Output Skew(4) — 0.5 ns Notes: 1. See test circuit and wave forms. 2. Minimum limits are guaranteed but not tested on Propagation Delays. 3. This parameter is guaranteed but not production tested. 4. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design. 5 PS2043A 03/12/96 PI74FCT162244MT 16-BIT HEAVY BUFFER/LINE DRIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Application Note Almost all propagation delay specifications in standard data books are specified for one single bit switching, not multiple-bit switching. The propagation delay tPLH/tPHL of a buffer driver increases very significantly for all 16 bits switching simultaneously, as compared with one single bit switching. For realistic heavy load applications such as DRAM modules and per JEDEC DRAM module specification, the driver propagation delay should be specified for all 16 bits switching worst case. The specification for one single bit switching in standard data books has no useful meaning. The following PI74FCT162244MT test data are tested under 150 pF heavy loads and all 16 bits switching simultaneously: Figure 1. Vertical voltage scale is 1.0V/div. Reference voltage level y2 at the middle is 1.5V. Horizontal time scale is 1.0 ns/div. For PI74FCT162244MT with 150 pF loads, all 16 bits switching, the propagation delay tPLH is 3.64 ns. Minimal undershoot and overshoot. 6 PS2043A 03/12/96 PI74FCT162244MT 16-BIT HEAVY BUFFER/LINE DRIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Figure 2. For PI74FCT162244MT, with 150pF load, all 16 bits switching, the propagation delay tPHL is 4.3ns. Figure 3. For PI74FCT162244MT, Output Skew tLH of less than 300 ps under 150 pF load, and all 16 bits switching. 7 PS2043A 03/12/96 PI74FCT162244MT 16-BIT HEAVY BUFFER/LINE DRIVER 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Figure 4. For PI74FCT162244MT, Output Skew tHL is less than 300 ps under 150 pF load, and all 16 bits switching. Pericom Semiconductor Corporation 2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com 8 PS2043A 03/12/96