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Logic Block Diagram
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16244 3.3V, 16-Bit Buffer/Line Driver
Product Features:
Compatible with LCX and LVT 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 (24 mA sink and source) Pin compatible with industry standard double-density pinouts Low ground bounce outputs Hysteresis on all inputs Industrial operating temperature range: 40C to +85C Multiple center pins and distributed Vcc/GND pins minimize switching noise Packages available: 48-pin 240 mil wide thin plastic TSSOP (A) 48-pin 300 mil wide plastic SSOP (V)
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Product Description:
Pericom Semiconductors PI74LPT series of logic circuits are produced in the Companys advanced 0.6 micron CMOS technology, achieving industry leading speed grades. The PI74LPT16244 is a 16-bit 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. This device is designed with threestate controls to operate in a Quad-Nibble, Dual-Byte, or a single 16bit word mode. The PI74LPT16244 can be driven from either 3.3V or 5.0V devices allowing this device to be used as a translator in a mixed 3.3/5.0V system.
2 3 4 5 6 7
1OE
3OE
1A0
1Y0
3A0
3Y0
8 9 10 11 12
1A1
1Y1
3A1
3Y1
1A2
1Y2
3A2
3Y2
1A3
1Y3
3A3
3Y3
2OE
4OE
2A0
2Y0
4A0
4Y0
13 14 15
2A1
2Y1
4A1
4Y1
2A2
2Y2
4A2
4Y2
2A3
2Y3
4A3
4Y3
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PS2067A
01/15/97
Product Pin Configuration
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PI74LPT16244 3.3V, 16-Bit Buffer/Line Driver
Product Pin Description
Pin Name xOE xAx xYx GND VCC Description 3-State Output Enable Inputs (Active LOW) Inputs 3-State Outputs Ground Power
Truth Table
Inputs(1)
XOE
L L H
xAx L H X
Outputs(1) xYx L H Z
Note: 1. H = High Voltage Level, X = Don't Care, L = Low Voltage Level, Z = High Impedance
1OE 1Y0 1Y1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39
2OE 1A0 1A1
GND
1Y2 1Y3
GND
1A2 1A3
VCC
2Y0 2Y1
VCC
2A0 2A1
GND
2Y2 2Y3 3Y0 3Y1
GND
2A2 2A3 3A0 3A1
48-PIN 48-PIN V48 V48 A48 A48
38 37 36 35 34 33 32 31 30 29 28 27 26 25
GND
3Y2 3Y3
GND
3A2 3A3
VCC
4Y0 4Y1
VCC
4A0 4A1
GND
4Y2 4Y3 4OE
GND
4A2 4A3 3OE
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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PS2067A 01/15/97
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16244 3.3V, 16-Bit Buffer/Line Driver
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ............................................................ -55C to +125C 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.
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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 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) VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V(3) VCC = Min. IOH = 0.1 mA VIN = VIH or VIL IOH = 3 mA VCC = 3.0V, IOH = 8 mA VIN = VIH or VIL IOH = 24 mA VCC = Min. IOL = 0.1 mA VIN = VIH or VIL IOL = 16 mA IOL = 24 mA VCC = Max.(3), VOUT = GND 60 VCC = 0V, VIN or VOUT 4.5V Min. 2.2 2.0 0.5 36 50 Vcc-0.2 2.4 2.4(5) 2.0 85 Typ(2) 0.7 60 90 3.0 3.0 0.2 0.3 240 150 Max. 5.5 5.5 0.8 1 1 1 1 1 1 1.2 110 200 0.2 0.4 0.5 mA 100 Units V V V A A A A A A V mA mA V V V V V V A m V
5 6 7 8 9 10 11 12 13 14 15
VOL
Output LOW Voltage
IOS IOFF VH
Short Circuit Current(4) Power Down Disable Input Hysteresis
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. 5. VOH = VCC 0.6V at rated current.
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PS2067A
01/15/97
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16244 3.3V, 16-Bit Buffer/Line Driver
Typ(2) 0.1 2.0 50
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 XOE = GND One Bit Toggling 50% Duty Cycle VCC = Max., Outputs Open fI = 10 MHZ 50% Duty Cycle XOE = GND One Bit Toggling VCC = Max., Outputs Open fI = 2.5 MHZ 50% Duty Cycle XOE = GND 16 Bits Toggling VIN = GND or VCC VIN = VCC - 0.6V(3) VIN = VCC VIN = GND Min. Max. 10 30 75 Units A A A/ MHz
IC
Total Power Supply Current(6)
VIN = VCC - 0.6V VIN = GND
0.5
0.8
mA
VIN = VCC - 0.6V VIN = GND
2.0
3.3(5)
Notes: 1. ForMax. 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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PS2067A 01/15/97
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16244 3.3V, 16-Bit Buffer/Line Driver
Switching Characteristics over Operating Range(1)
LPT16244 Com. Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ tSK(o) Description Propagation Delay XAX to XYX Output Enable Time xOE to xYx Output Disable Time(4) xOE to xYx Output Skew(5) Conditions CL = 50 pF RL = 500
(2)
1
LPT16244A Com. Min
(3)
LPT16244C Com. Min
(3)
2
Unit ns
Min
(3)
Max 5.2 7.0 7.0 0.5
Max 4.8 6.2 5.6 0.5
Max 4.1 5.8 5.2 0.5
1.5 1.5 1.5
1.5 1.5 1.5
1.5 1.5 1.5
3
ns ns ns
4 5
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 wave forms. 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.
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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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PS2067A 01/15/97

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