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PI3B16245 PI3B162245 (25)
3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
Product Description
Product Features
* * * * * * * * Near-zero propagation delay 5 switches connect inputs to outputs Fast Switching Speed - 4ns max. Permits Hot Insertion Pin compatible with 74 series16245 Operating Vcc Range: 3.0V to 3.6V Industrial operating temperature: -40C to +85C Packages available: - 48-pin 240 mil wide thin plastic TSSOP (A) - 48-pin 300 mil wide plastic SSOP (V)
Pericom Semiconductor's PI3B series of logic circuits are produced using the Company's advanced 0.35 micron CMOS technology. The PI3B16245 and PI3B162245 are 3.3 volt, hot-insertion, 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 switches create no additional propagational delay or additional ground bounce noise. The PI3B162245 device has a built-in 25-ohm series resistor to reduce noise resulting from reflections, thus eliminating the need for an external terminating resistor.
Logic Block Diagram
1A0 1B0
Product Pin Configuration
NC
1B0 1B1
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
1BE 1A0 1A1
GND
1A7
1B7
1B2 1B3
GND
1A2 1A3
VCC
1B4
VCC
1A4 1A5
1BE
1B5
GND
1B6 1B7
GND
1A6 1A7 2A0 2A1
2A0
2B0
2B0 2B1
48-Pin 37 A, V
36 35 34 33 32 31 30 29 28 27 26 25
GND
2B2
GND
2A2 2A3
2A7
2B7
2B3
VCC
2B4 2B5
VCC
2A4 2A5
2BE
GND
2B6 2B7
GND
2A6 2A7 2BE
Truth Table
Function Disconnect Connect
(1)
NC
nBE H L
nA0-7 Hi-Z nB0-7
Product Pin Description
Pin Name nBE nA0-nA7 nB0-nB7 I/O I
I/O I/O
Note: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
Description Bus Enable Input (Active LOW) Bus A Bus B
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PS8189C
09/13/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245/PI3B162245 3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
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 ........................ -0C to +85C Supply Voltage Range ........................................................ -0.5V to +4.6V DC Input Voltage ............................................................... -0.5V to +4.6V 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 = 3.0V to 3.6V)
Parameters Description VIH VIL IIH IIL IOZH VIK RON Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Switch On Resistance
(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 = -18mA VCC = Min., VIN = 0.0V, ION = 48mA VCC = Min., VIN = 2.4V, ION = 15mA 16245 162245 16245 162245
Min. 2.0 -0.5 -- -- -- -- -- 20 -- 20
Typ(2) -- -- -- -- -- -0.7 5 28 10 35
Max. -- 0.8 1 1 1 -1.2 8 40 15 48
Units V V A A A V
Capacitance (TA = 25C, f = 1 MHz)
Parameters(4) 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 3.0 8.5 17.0 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 = 3.3V, TA = 25C ambient and maximum loading. 3. 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. 4. This parameter is determined by device characterization but is not production tested.
2
PS8189C
09/13/99
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245/PI3B162245 3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
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 BE = GND Control Input Toggling 50% Duty Cycle Test Conditions(1) VIN = GND or VCC VIN = 3.0V(3) Min. Typ(2) Max. 10 750
0.25
Units A A
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 = 3.3V, +25C ambient. 3. Per TTL driven input (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.
Switching Characteristics over Operating Range
Com.
Parameters tPLH tPHL tPZH tPZL tPHZ tPLZ Description Propagation Delay(2,3) Ax to Bx, Bx to Ax Bus Enable Time BE to Ax or Bx Bus Disable Time BE to Ax or Bx Conditions(1) CL = 50pF 16245 RL = 500 162245 CL = 50pF, RL= 500 CL = 50pF, RL= 500 Min. Max. 0.25 1.25 4.5 5.0 Units
1 1
ns
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.
Ordering Information
Part
PI3B16245A PI3B16245V
Pin Package
48- TSSO P (A48) 48- SSO P (V48)
Te mpe rature
- 40C to +85C - 40C to +85C
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
3
PS8189C 09/13/99

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