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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C34X2245 32-BIT, 2-PORT BusSwitch with 25 Series Resistor
PI5C34X2245
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
Product Features:
Near-zero propagation delay 25 series resistor termination 5 switches connect inputs to outputs Direct bus connection when switches are ON Ultra-low quiescent power (0.2 A typical) - Ideally suited for notebook applications * Pin compatible with QS34X245 * Industrial operating temperature: -40C to +85C * Packages available: - 80-pin 150 mil wide plastic BQSOP (B) * * * * *
32-Bit, 2-Port BusSwitch with 25 Series Resistor
Product Description:
Pericom Semiconductor's PI5C series of logic circuits are produced in the Company's advanced 0.6 micron CMOS technology. The PI5C34X2245 is a 32-bit, 2-port bus switch. Four enable signals (BEn) turn the switches on. The bus switch creates no additional propagational delay or additional ground bounce noise. The device has a built-in 25 resistor to reduce noise resulting from reflection, thus eliminating the need for an external terminating resistor.
Product Pin Configuration
NC A0 A1 A2 A3 A4 A5 A6 A7 GND NC A8 A9 A10 A11 A12 A13 A14 A15 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 66 65 64 63 62 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 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
Logic Block Diagram
A0 B0
A7
B7
BE1
A8
B8
A15
B15
BE2
A16
B16
GND NC A16 A17 A18 A19 A20 A21 A22 A23
80-Pin B80 61
A23
B23
BE3
A24
B24
GND NC A24 A25 A26 A27
A31
B31
BE4
A28 A29 A30 A31
Truth Table
Function Disconnect Connect
(1)
BEn H L
A0-31 Hi-Z B0-31
GND
Product Pin Description
Pin Name BEn A0-A31 B0-B31
200
Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
I/O I
I/O I/O
Description Bus Enable Input (Active LOW) Bus A Bus B
PS8196 05/05/98
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PI5C34X2245 32-BIT, 2-PORT BusSwitch with 25 Series Resistor
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 (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 ................................................................................... 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 the Operating Range, TA = -40C to +85C, VCC = 5V 10%)
Parameters Description VIH VIL IIH IIL IOZH VIK IOS VH RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Short Circuit Current
(3)
Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max., VIN = VCC VCC = Max., VIN = GND 0 - A, B - VCC VCC = Min., IIN = -18 mA A (B) = 0V, B (A) = VCC VCC = Min., VIN = 0.0V, ION = 48 mA VCC = Min., VIN = 2.4V, ION = 15 mA
Min. 2.0 -0.5 -- -- -- -- 100 -- -- --
Typ(2) -- -- -- -- -- -0.7 -- 150 28 35
Max. -- 0.8 1 1 1 -1.2 -- -- 40 48
Units V V A A A V mA mV
Input Hysteresis at Control Pins Switch On Resistance
(4)
Capacitance (TA = 25C, f = 1 MHz)
Parameters(5) CIN COFF CON Description Input Capacitance A/B Capacitance, Switch Off A/B Capacitance, Switch On Test Conditions VIN = 0V VIN = 0V VIN = 0V Typ 6 6 12 Units pF 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, TA = 25C ambient and maximum loading. 3. Not more than one output should be shorted at one time. Duration of t he 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.
201
PS8196
05/05/98
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C34X2245 32-BIT, 2-PORT BusSwitch with 25 Series Resistor
Power Supply Characteristics
Parameters Description ICC ICC ICCD Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Supply Current per Input per MHz(4) Test Conditions(1) VCC = Max. VCC = Max. VCC = Max., A and B Pins Open BEn = GND Control Input Toggling 50% Duty Cycle VIN = GND or VCC VIN = 3.4V(3) Min. -- -- -- Typ(2) 0.1 -- -- Max. 3.0 2.5 0.25 Units A mA mA/ MHz
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, +25C ambient. 3. Per TTL driven input (VIN = 3.4V, control inputs only); A and B pins do not contribute to Icc. 4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified frequency. The A and B inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design.
PI5C34X2245 Switching Characteristics over Operating Range
PI5C34X2245 Com. Min. Max. -- 1.5 1.5 1.25 7.5 5.5 ns
Parameters Description tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Delay(2,3) Ax to Bx, Bx to Ax Bus Enable Time BEX to Ax or Bx Bus Disable Time BEx to Ax or Bx
Conditions(1) CL = 50 pF RL = 500
Unit
Notes: 1. See test circuit and wave forms. 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 0.25 ns for 50 pF 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.
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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