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PI5C16245 PI5C162245 (25)
16-Bit, 2-Port Bus Switch
*
Near-zero propagation delay 5 switches connect inputs to outputs Direct bus connection when switches are ON Ultra-low quiescent power (0.2A typical) Ideally suited for notebook applications Pin compatible with 74 series16245 Industrial operating temperature: 40C to +85C Packages available: 48-pin 240 mil wide thin plastic TSSOP (A) 48-pin 150 mil wide plastic BQSOP (B) 48-pin 300 mil wide plastic SSOP (V)
Product Features
Product Description
Pericom Semiconductors PI5C series of logic circuits are produced using the Companys advanced 0.6 micron CMOS technology. The PI5C16245 and PI5C162245 are 16-bit, 2-port bus switches that are pin compatible with the 74 series 16245 16-bit transceiver. Two enable signals (nBE) turn the switches on, similar to the enable signals of the 16245. The bus switch creates no additional propagational delay or additional ground bounce noise. The PI5C162245 device has a built-in 25-ohm series resistor to reduce reflection noise, thus eliminating the need for an external terminating resistor.
Logic Block Diagram
1A0 1B0
Product Pin Configuration
NC
1B0 1B1
GND
1A7 1B7
1B2 1B3
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 48-Pin 37 A,B,V 36 35 34 33 32 31 30 29 28 27 26 25
1BE 1A0 1A1
GND
1A2 1A3
VCC
1B4
VCC
1A4 1A5
1BE
1B5
GND
1B6 1B7
GND
1A6 1A7 2A0 2A1
2A0
2B0
2B0 2B1
GND
2B2
GND
2A2 2A3
2A7
2B7
2B3
VCC
2B4 2B5
VCC
2A4 2A5
2BE
GND
2B6
GND
2A6 2A7 2BE
Truth Table
(1)
2B7
Function Disconnect Connect
nBE H L
nA0-7 Hi- Z nB0- 7
NC
Product Pin Description
Pin Name nBE nA0-nA7 nB0-nB7
1
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
PS7025B 06/21/00
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C16245/162245 16-Bit, 2-Port Bus Switch
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 ...................................................................................... 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 = 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) Input Hysteresis at Control Pins Switch On Resistance(4) VCC = Min., VIN = 0.0V, ION = 48mA VCC = Min., VIN = 2.4V, ION = 15mA 16245 162245 16245 162245 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 = -18mA A (B) = 0V, B (A) = VCC Min. 2.0 -0.5 -- -- -- -- 100 -- -- 20 -- 20 Typ(2) -- -- -- -- -- -0.7 -- 150 5 28 10 35 Max. -- 0.8 1 1 1 -1.2 -- -- 7 40 15 48 Units V V A A A V mA m V
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 -- -- -- Max. 6 6 8 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 the test should not exceed one second. 4. Measured by the voltage drop between A and B pins 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.
2
PS7025B
06/21/00
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PI5C16245/162245 16-Bit, 2-Port Bus Switch
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) VCC = Max. VCC = Max. VCC = Max., A and B Pins Open nBE = GND Control Input Toggling 50% Duty Cycle Test Conditions(1) 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.
PI5C16245 Switching Characteristics over Operating Range
PI5C16245 Com. Parame te rs tPLH tPHL tPZH tPZL tPHZ tPLZ D e s cription Propagation Delay (2,3) xAx to xBx, xBx to xAx, Bus Enable TIme xBE to xAx or xBx, Bus Disable TIme xBE to xAx or xBx, Conditions CL = 50pF RL = 500 M in. 1.5 1.5 M ax. 0.25 6.5 5.5 ns Units
PI5C162245 Switching Characteristics over Operating Range
PI5C162245 Com. Parame te rs tPLH tPHL tPZH tPZL tPHZ tPLZ D e s cription Propagation Delay (2,3) xAx to xBx, xBx to xAx, Bus Enable TIme xBE to xAx or xBx, Bus Disable TIme xBE to xAx or xBx, Conditions CL = 50pF RL = 500 M in. 1.5 1.5 M ax. 1.25 6.5 5.5 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. 3
PS7025B 06/21/00
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C16245/162245 16-Bit, 2-Port Bus Switch
Applications Information
Logic Inputs
The logic enable inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a +5.0V supply, the enable pins(s) may be driven low to 0V and high to 5.5V. Driving the enable pin(s) Rail-to-Rail R minimizes power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is recommended for all CMOS devices. Always apply Vcc before applying signals to the input/output or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola.
Ordering Information
Part
PI5C16245A PI5C16245B PI5C16245V
Pin Package
48- TSSOP (A) 48- BQSOP (B) 48- SSOP (V)
Te mpe rature
- 40C to +85C
48-Pin TSSOP (240 Mil Wide) - Package Code: 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
.0197 BSC 0.50
.007 .010 0.17 0.27
.002 .006 0.05 0.15
X.XX X.XX
DENOTES DIMENSIONS IN MILLIMETERS
4
PS7025B
06/21/00
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PI5C16245/162245 16-Bit, 2-Port Bus Switch
48-Pin BQSOP (150 Mil Wide) - Package Code: B
48
.150 .157 3.80 4.00
.228 .244 5.80 6.20
Gauge Plane .010 0.25 BSC .386 .394 9.80 10.00 .008 0.20 Nom Nom .063 1.60 .079 2.0 Max .002 0.05 .009 0.25 .020 .029 0.50 0.75
1
.014 0.356 REF
.015 0.381 x 45
.0157 BSC 0.40
.0051 .009 0.13 0.23
5
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
48-Pin SSOP (300 Mil Wide) - Package Code: V
48
.291 .299 7.39 7.59
.395 .420 10.03 10.67
Gauge Plane .010 0.25 1 .02 0.51 .04 1.01
.620 .630 15.75 16.00
.008 0.20 Nom.
.015 0.381 x 45 .025 0.635
.110 2.79 Max
0-8 .025 BSC 0.635 .008 0.20 .0135 0.34
.008 0.20 .016 0.40
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
5
PS7025B 06/21/00

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