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PI3VT34X245
32-Bit, 2-Port, Low Voltage Translator Bus Switch
Product Features
Near zero propagation delay Low ON resistance switches connect inputs to outputs 2.5V Supply Voltage Operation 2.5V or 1.8V switching Packages available: 80-pin, 150 mil wide plastic BQSOP (B)
Product Description
Pericom Semiconductors PI3VT series of logic circuits are produced using the Companys advanced submicron CMOS technology, achieving industry leading performance. The PI3VT34X245, is a 2.5V or 3.3V 8-bit, 2-port bus switch, is designed with a low ON resistance (5 ohms). The switches are turned ON or enabled by the Bus Enable (BEn) input signal. Given a 3.3V supply and an input voltage of 3.3V, the switch translates to an output voltage of 2.5V. Similarly, when operated with a 2.5V supply and given 2.5V inputs, the device translates the outputs to 1.8V.
Applications
3.3V to 2.5V level shifting (voltage translation) 2.5V to 1.8V level shifting (voltage translation)
Logic Block Diagram
Product Pin Configuration
NC A0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 80 79 78 77 76 75 74 73 72 71 70 69 68 67 VCC BE1 B0 B1 B2 B3 B4 B5 B6 B7 VCC BE2 B8 B9 B10 B11 B12 B13 B14 B15 VCC BE3 B16 B17 B18 B19 B20 B21 B22 B23 VCC BE4 B24 B25 B26 B27 B28 B29 B30 B31
A0
B0
A1 A2 A3 A4
A7 BE1 A8
B7
A5 A6 A7 GND NC
B8
A8 A9 A10 A11
A15 BE2 A16
B15
A12 A13 A14 A15 GND
80-Pin B
66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
B16
NC A16 A17
A23 BE3 A24
B23
A18 A19 A20 A21 A22
B24
A23 GND NC A24
A31 BE4
B31
A25 A26 A27 A28 A29 A30 A31 GND
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PS8531
03/19/01
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PI3VT34X245 32-Bit, 2-Port, Low Voltage Translator Bus Switch
Truth Table(1)
Function Disconnect Connect Notes: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance BEN H L A031 Hi-Z B031
Product Pin Description
Pin Name BEN A0- A31 B0- B31 I/O I I/O I/O D e s cription Bus Enable Input (Active LO W) Bus A Bus B
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 Supply Voltage to Ground Potential ......................................... 0.5V to +4.6V DC Input Voltage .................................................................. 0.5V to +5.5V DC Output Current ............................................................................ 120mA Power Dissipation ................................................................................ 0.5W 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 Operating Range, TA = 40C to +85C, VCC = 3.3V 10%)
Parame te rs VIH VIL IIH IIL IOZH D e s cription Input HIGH Voltage Input LO W Voltage Input HIGH Current Input LO W Current Te s t Conditions (1) Guaranteed Logic HIGH Level Guaranteed Logic LO W Level VCC = Max., VIN = VCC VCC = Max., VIN = GND VCC = Min., VIN = 0.0V, ION = 8mA RON Switch O N Resistance VCC = Min., VIN = 1.7V, ION = 8mA VCC = 2.3V, VIN = 0.0V, ION = 8mA VCC = 2.3V, VIN = 1.3V, ION = 8mA VP Pass Voltage VIN = VCC = 3.3V, IOUT = 5A VIN = VCC = 2.5V, IOUT = 5A 2.3 5 10 6 25 2.5 1.8 M in. 1.8 0.5 Typ.(2) M ax. VCC +0.3V 0.8 1 1 1 8 22 9 30 2.9 V A Units V
High Impedance O utput Current 0 A, B VCC
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PS8531
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PI3VT34X245 32-Bit, 2-Port, Low Voltage Translator Bus Switch
Capacitance (TA = 25C, f = 1 MHz)
Parame te rs (5) CIN C O FF CON Input Capacitance
De s cription
Te s t Conditions
Typ. 3.5
Units
A/B Capacitance, Switch Off A/B Capacitance, Switch On
VIN = 0V
5.0 10.0
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 = 3.3V, TA = 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. Measured by the voltage drop between A and B pin at indicated current through the switch. ON resistance is determined by the lower of the voltages on the two (A,B) pins. 5. This parameter is determined by device characterization but is not production tested.
Power Supply Characteristics
Parame te rs ICC ICC De s cription Quiescent Power Supply Current Supply Current per Input HIGH Te s t Conditions (1) VIN = GND or VCC VCC = Max. VIN
=
M in.
Typ.(2)
M ax. 12
Units
A 3V(3) 50
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 driven input (control input only); A and B pins do not contribute to ICC.
Switching Characteristics over 3.3V 0.3V Operating Range
Parame te r tPLH tPHL tPZH tPZL tPHZ tPLZ Te s t Conditions Propagation Delay (2,3), Ax to Bx Bus Enable Time; BE to Ax or Bx Bus Disable Time; BE to Ax or Bx Conditions (1) CL = 50pF RL = 500 ohms CL = 50pF RL = 500 ohms R = 500 ohms Com. M in. 1.5 1.5 M ax. 0.25 6.5 5.5 ns Units
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PS8531
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Ordering Information
Part PI3VT34X245B Pin-Package 80- BQSOP (B) Te mpe rature 40C to +85C
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PI3VT34X245 32-Bit, 2-Port, Low Voltage Translator Bus Switch
Switching Characteristics over 2.5V 0.2V Operating Range
Parame te r tPLH tPHL tPZH tPZL tPHZ tPLZ Te s t Conditions Propagation Delay (2,3), Ax to Bx Bus Enable Time; BE to Ax or Bx Bus Disable Time; BE to Ax or Bx Conditions (1) CL = 50pF RL = 500 ohms CL = 50pF RL = 500 ohms R = 500 ohms Com. M in. 1.5 1.5 M ax. 0.25 9.8 9.8 ns Units
Notes: 1. See test circuit and waveforms. 2. This parameter is guaranteed but not tested on Propagation Delays. 3. The bus switch contributes no propagational delay other than the RC delay of the ON resistance of the switch and the load capacitance. The time constant for the switch alone is of the order of 0.25ns for 50pF load. Since this time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side.
80-pin BQSOP package (Q)
80 41
.150 .157 3.80 4.00
.228 .244 5.80 6.20
.008 NOM 0.203 Gauge Plane 5
1 0.803 0.811 20.40 20.60
40
.019 0.50 .029 0.75
.010 0.254 BSC
0.50 .019 REF
.010 .016 .063 1.60 Nom .078 2.0 Max
0.254 x 45 0.406
.0197 BSC 0.50
.007 .010 0.17 0.27
5 .002 .009 0.05 0.25
X.XX X.XX
DENOTES DIMENSIONS IN MILLIMETERS
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
4
PS8531 03/19/01

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