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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCH16244
16-Bit Buffer Driver with 3-State Outputs
Features
* * * * * * * * Designed for low-voltage operation VCC = 2.3V to 3.6V Hysteresis on all inputs Typical VOLP (Output Ground Bounce) < 0.8V at VCC = 3.3V, TA = 25C Typical VOHV (Output VOH Undershoot) < 2.0V at VCC = 3.3V, TA = 25C Bus Hold retains last active bus state during 3-State, eliminating the need for external pullup resistors Industrial operation at -40C to +85C Packaging: - 48-pin 240-mil wide plastic TSSOP (A)
Description
Pericom Semiconductor's PI74ALVCH16244 is an non-inverting 16-bit buffer/driver designed for low-voltage 2.3V to 3.6V VCC operation. The buffer/driver is designed specifically to improve both the performance and density of 3-State memory address drivers, clock drivers, and bus-oriented receivers and transmitters. The device can be used as four 4-bit buffers, two 8-bit buffers, or one 16-bit buffer. It provides non-inverting outputs and symmetrical active-low output-enable (OE) inputs. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor in which the minimum value is determined by the current-sinking capability of the driver. The PI74ALVCH16244 has "Bus Hold" which retains the data input's last state whenever the data input goes to high-impedance preventing "floating" inputs and eliminating the need for pullup/ down resistors.
Block Diagram
1OE 1 2 3 5 6 1Y1 1Y2 1Y3 1Y4 3OE 25 3A1 36 3A2 35 3A3 33 3A4 32 4OE 24 4A1 30 4A2 29 4A3 27 4A4 26
1A1 47 1A2 46 1A3 44 1A4 43 2OE 48 2A1 41 2A2 40 2A3 38 2A4 37
13 14 16 17
3Y1 3Y2 3Y3 3Y4
8 9 11 12
2Y1 2Y2 2Y3 2Y4
19 20 22 23
4Y1 4Y2 4Y3 4Y4
1
PS8087C
10/05/04
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PI74ALVCH16244 16-Bit Buffer Driver with 3-State Outputs
Pin Description
Pin Name nOE nAx nYx GND VCC Inputs 3- State Outputs Ground Power De s cription 3- State Output Enable Inputs (Active LOW)
Truth Table(1)
Inputs nOE L L H
Notes: 1. H = High Signal Level L = Low Signal Level X = Don't Care or Irrelevant Z = High Impedance
Outputs nAx H L X nYx H L Z
Pin Configuration
1OE 1Y1 1Y2 GND 1Y3 1Y4 VCC 2Y1 2Y2 GND 2Y3 2Y4 3Y1 3Y2 GND 3Y3 3Y4 VCC 4Y1 4Y2 GND 4Y3 4Y4 4OE 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 38 37 36 35 34 33 32 31 30 29 28 27 26 25 2OE 1A1 1A2 GND 1A3 1A4 VCC 2A1 2A2 GND 2A3 2A4 3A1 3A2 GND 3A3 3A4 VCC 4A1 4A2 GND 4A3 4A4 3OE
2
PS8087C
10/05/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCH16244 16-Bit Buffer Driver with 3-State Outputs
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 Input Voltage Range, VIN ......................................................... -0.5V to VCC +0.5V Output Voltage Range, VOUT .................................................. -0.5V to VCC +0.5V DC Input Voltage ...................................................................... -0.5V to +5.0V DC Output Current ............................................................................... 100mA 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 = -40C to +85C, VCC = 3.3V 10%)
Parame te rs VCC VIH(3) VIL(3) VIN
(3)
De s cription Supply Voltage Input HIGH Voltage Input LOW Voltage Input Voltage Output Voltage
Te s t Conditions (1) VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V
M in. 2.3 1. 7 2.0
Typ.(2)
M ax. 3.6
Units
0.7 0.8 0 0 VCC VCC
VOUT(3)
IOH = -100A, VCC = Min. to Max. VIH = 1.7V, IOH = -6mA, VCC = 2.3V VOH Output HIGH Voltage VIH = 1.7V, IOH = -12mA, VCC = 2.3V VIH = 2.0V, IOH = -12mA, VCC = 2.7V VIH = 2.0V, IOH = -12mA, VCC = 3.0V VIH = 2.0V, IOH = -24mA, VCC = 3.0V IOL = 100A, VIL = Min. to Max. VOL Output LOW Voltage VIL = 0.7V, IOL = 6mA, VCC = 2.3V VIL = 0.7V, IOL = 12mA, VCC = 2.3V VIL = 0.8V, IOL = 12mA, VCC = 2.7V VIL = 0.8V, IOL = 24mA, VCC = 3.0V IOH(3) Output HIGH Current Output LOW Current VCC = 2.3V VCC = 2.7V VCC = 3.0V VCC = 2.3V VCC = 2.7V VCC = 3.0V
VCC - 0.2 2.0 1.7 2.2 2.4 2.0 0.2 0.4 0.7 0.4 0.55 -12 -12 -24 12 12 24 mA V
IOL(3)
3
PS8087C
10/05/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCH16244 16-Bit Buffer Driver with 3-State Outputs
DC Electrical Characteristics-Continued (Over the Operating Range, TA = -40C to +85C, VCC = 3.3V 10%)
Parame te rs IIN De s cription Input Current Te s t Conditions (1) VIN = VCC or GND, VCC = 3.6V VIN = 0.7V, VCC = 2.3V IIN (HOLD) Input Hold Current VIN = 1.7V, VCC = 2.3V VIN = 0.8V, VCC = 3.0V VIN = 2.0V, VCC = 3.0V VIN = 0 to 3.6V, VCC = 3.6V IOZ ICC ICC Output Current (3- State Outputs) Supply Current Supply Current per Input @ TTL HIGH Control Inputs Data Inputs Outputs VOUT = VCC or GND, VCC = 3.6V VCC = 3.6V, IOUT = 0A, VIN = GND or VCC VCC = 3.0V to 3.6V One Input at VCC - 0.6V Other Inputs at VCC or GND VIN = VCC or GND, VCC = 3.3V VO = VCC or GND, VCC = 3.3V 3 6 7 pF 45 -4 5 75 -75 500 10 40 750 A M in. Typ.(2) M ax. 5 Units
CI CO
Notes: 1. For conditions shown as Max. or Min., 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. Unused Control Inputs must be held HIGH or LOW to prevent them from floating.
Switching Characteristics over Operating Range(1)
Parame te rs tPD tEN tDIS t/v(3) From (Input) A OE OE Description Input Transition Rise or Fall 0 10 0 10 0 10 ns/V To (Output) Y Y Y VCC = 2.5V 0.2V M in.(2) 1.0 1.0 1.0 M ax. 3.7 5.7 5.2 VCC = 2.7V M in.(2) M ax. 3.6 5.4 4.6 VCC = 3.3V 0.3V M in.(2) 1.0 1.0 1.0 M ax. 3.0 4.4 4.1 ns Units
Notes: 1. See test circuit and waveforms. 2. Minimum limits are guaranteed but not tested on Propagation Delays. 3. Recommended operating condition.
Operating Characteristics, TA = 25C
Parame te r CPD Power Dissipation Capacitance Outputs Enabled Outputs Disabled Te s t Conditions C L = 50pF f = 10 MHz VCC = 2.5V 0.2V 16 4 VCC = 3.3V 0.3V 19 5 Typical Units pF
4
PS8087C
10/05/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74ALVCH16244 16-Bit Buffer Driver with 3-State Outputs
Packaging Mechanical 48-pin TSSOP (A)
48
.236 .244
6.0 6.2
1
.488 12.4 .496 12.6 .047 1.20 Max SEATING PLANE
.004 0.09 .008 0.20 0.45 .018 0.75 .030 .319 BSC 8.1
X.XX X.XX
DENOTES DIMENSIONS IN MILLIMETERS
.0197 BSC 0.50
.007 .010 0.17 0.27
.002 .006 0.05 0.15
Ordering Information
Ordering Code PI74ALVCH16244A Package Code A Package Type 48-pin TSSOP
Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com
5
PS8087C 10/05/04

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