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PI74LPT244
Fast CMOS 3.3V 8-Bit Buffer/Line Driver
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 (24mA sink and source) * Low ground bounce outputs * Hysteresis on all inputs * Industrial operating temperature range: -40C to +85C * Packages (Pb-free & Green available): - 20-pin 173-mil wide plastic TSSOP (L) - 20-pin 150-mil wide plastic QSOP (Q) - 20-pin 300-mil wide plastic SOIC (S) - 20-pin 209-mil wide plastic SSOP (H)
Description
Pericom Semiconductor's PI74LPT244 is an 8-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. The PI74LPT244 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.
Block Diagram
Pin Configuration
OEA DA0 OB0 DA1 OB1 DA2 OB2 DA3 OB3 GND
1 20 2 19 3 18 4 20-PIN 17 L20 16 5 Q20 15 6 S20 7 14 8 13 9 12 10 11
VCC OEB OA0 DB0 OA1 DB1 OA2 DB2 OA3 DB3
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PI74LPT244 3.3V 8-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.
Pin Description
Pin Name OEA, OEB Dxx Oxx GND VCC Description 3-State Output Enable Inputs (Active LOW) Inputs Outputs Ground Power
Truth Table(1)
Inputs OEA L L H OEB L L H DXX L H X Outputs OXX L H Z
Notes: 1. H = High Voltage Level, X = Don't Care, L = Low Voltage Level, Z = High Impedance
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PI74LPT244 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 IIH 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 Test Conditions(1) Min. 2.2 2.0 -0.5 Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max. VCC = Max. VCC = Max. VCC = Max. VCC = Max. VIN = 5.5V VIN = VCC VIN = GND VIN = GND VOUT = 5.5V -0.7 -36 50 VCC0.2 2.4 2.4(5) 2.0 -60 90
Typ(2)
Max. 5.5 5.5 0.8 1 1 1 1 1 1 -1.2 -110
Units
V
IIL IOZH IOZL VIK IODH IODL
A
VCC = Max. VOUT = GND VCC = Min., IIN = -18 mA VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V VCC = 3.3V, VIN = VIH or VIL, VO = 1.5V VCC = Min. VIN = VIH or VIL VCC = 3.0V, VIN = VIH or VIL IOH = -0.1 mA
V mA
200
VOH
Output HIGH Voltage
VOL IOS IOFF VH
Output LOW Voltage Short Circuit Current Power Down Disable Input Hysteresis
IOH = -3 mA IOH = -8 mA IOH = -24 mA IOL = 0.1 mA VCC = Min. IOL = 16 mA VIN = VIH or VIL IOL = 24 mA VCC = Max., VOUT = GND VCC = 0V, VIN or VOUT 4.5V
3.0 3.0 0.2 0.4 0.5 -240 100
V
-60
0.2 0.3 -85 150
mA A mV
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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PI74LPT244 3.3V 8-Bit Buffer /Line Driver 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
Notes: 1. This parameter is determined by device characterization but is not production tested.
Power Supply Characteristics
Parameters ICC ICC ICCD Description 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 OEX = GND One Bit Toggling 50% Duty Cycle VCC = Max., Outputs Open fI = 10 MHZ 50% Duty Cycle OEX = GND One Bit Toggling VCC = Max., Outputs Open fI = 2.5 MHZ 50% Duty Cycle OEX = GND 8 Bits Toggling
Min. VIN = GND or VCC VIN = VCC - 0.6V(3) VIN = VCC VIN = GND VIN = VCC - 0.6V VIN = GND VIN = VCC - 0.6V VIN = GND
Typ(2) 0.1
Max. 10 500
Units A A
50
75
A/ MHz
IC
Total Power Supply Current(6)
0.6
2.3
mA
2.1
4.7(5)
mA
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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PI74LPT244 3.3V 8-Bit Buffer /Line Driver Switching Characteristics over Operating Range(1)
LPT244 Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ tSK(O) Description Propagation Delay DXX to OXX Output Enable Time OEx to Oxx Output Disable Time(3) OEx to Oxx Output Skew(4) CL = 50pF RL = 500 Conditions Com. Min.(2) 1.5 1.5 1.5 Max 6.5 8.0 7.0 0.5 LPT244A Com. Min.(2) 1.5 1.5 1.5 Max. 4.8 6.2 5.6 0.5 LPT244C Com. Min.(2) 1.5 1.5 1.5 Max. 4.1 5.8 5.2 0.5 ns Units
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. 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.
Packaging Mechanical: 20-pin QSOP (Q)
20
.008 0.20 MIN.
.150 .157
3.81 3.99
Guage Plane
.008 .013 0.20 0.33
1
.337 8.56 .344 8.74
.010 0.254
Detail A
.016 .035 0.41 0.89
.041 1.04 REF
0-6
.058 REF 1.47
.053 1.35 .069 1.75
.015 x 45 0.38
Detail A
SEATING PLANE
.007 .010
.016 .050
0.178 0.254
0.41 1.27
.025 BSC 0.635
.008 0.203 .012 0.305
.004 0.101 .010 0.254
.228 .244 5.79 6.19
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
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PI74LPT244 3.3V 8-Bit Buffer /Line Driver Packaging Mechanical: 20-pin TSSOP (L)

Packaging Mechanical: 20-pin SOIC (S)
20
.2914 .2992
7.40 7.60
.010 .029 0.254 x 45 0.737
1 .496 12.60 .511 12.99 0-8
0.41 .016 1.27 .050 .0091 .0125 0.23 0.32
.020 0.508 REF .030 0.762
.0926 .1043
2.35 2.65
SEATING PLANE
.394 .419 10.00 10.65
.050 BSC 1.27
.013 .020 0.33 0.51
.0040 .0118
0.10 0.30
X.XX DENOTES CONTROLLING X.XX DIMENSIONS IN MILLIMETERS
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PI74LPT244 3.3V 8-Bit Buffer /Line Driver
Packaging Mechanical: 20-pin SSOP (H)

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PI74LPT244 3.3V 8-Bit Buffer /Line Driver Ordering Information
Ordering Code PI74LPT244Q PI74LPT244QE PI74LPT244L PI74LPT244LE PI74LPT244AQ PI74LPT244AQE PI74LPT244AS PI74LPT244ASE PI74LPT244CQ PI74LPT244CS PI74LPT244CSE PI74LPT244CQE PI74LPT244AH PI74LPT244AHE
Notes:
Package Code Q Q L L Q Q S S Q S S Q H H
Speed Grade Blank Blank Blank Blank A A A A C C C C A A
Description 20-pin 150-mil wide plastic QSOP Pb-free & Green 20-pin 150-mil wide plastic QSOP 20-pin 173-mil wide plastic TSSOP Pb-free & Green, 20-pin 173-mil wide plastic TSSOP 20-pin 150-mil wide plastic QSOP Pb-free & Green 20-pin 150-mil wide plastic QSOP 20-pin 300-mil wide plastic SOIC Pb-free & Green, 20-pin 300-mil wide plastic SOIC 20-pin 150-mil wide plastic QSOP 20-pin 300-mil wide plastic SOIC Pb-free & Green, 20-pin 300-mil wide plastic SOIC Pb-free & Green, 20-pin 150-mil wide plastic QSOP 20-pin 209-mil wide plastic SSOP Pb-free & Green, 20-pin 209-mil wide plastic SSOP
* Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ * E = Pb-free and Green * Adding an X Suffix = Tape/Reel
Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com
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