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IDT74FST163P245 16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
16-BIT BUS SWITCH
IDT74FST163P245
FEATURES:
* * * *
Bus switches provide zero delay paths Low switch on-resistance TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) * Hot insertion capability * Very low power dissipation * Available in SSOP, TSSOP, and TVSOP packages
DESCRIPTION:
The FST163P245 belongs to IDT's family of Bus switches. Bus switch devices perform the function of connecting or isolating two ports without providing any inherent current sink or source capability. Thus they generate little or no noise of their own while providing a low resistance path for an external driver. These devices connect input and output ports through an n-channel FET. When the gate-to-source junction of this FET is adequately forward-biased the device conducts and the resistance between input and output ports is small. Without adequate bias on the gateto-source junction of the FET, the FET is turned off, therefore with no VCC applied, the device has hot insertion capability. The low on-resistance and simplicity of the connection between input and output ports reduces the delay in this path to close to zero. The FST163P245 supports precharge of the B port. When xOE is high, the A and B ports are isolated, and the B port's pins are precharged to the bias voltage through the equivalent of a 10K resistor on each B port pin.
FUNCTIONAL BLOCK DIAGRAM
VBIAS1
1A1
1B1
1A8
1B8 VBIAS1
2A1
2B1
2A8 1OE 2OE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2B8
INDUSTRIAL TEMPERATURE RANGE
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(c) 1999 Integrated Device Technology, Inc.
OCTOBER 1999
DSC-5514/1
IDT74FST163P245 16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) Description Terminal Voltage with Respect to GND Storage Temperature Maximum Continuous Channel Current Max -0.5 to +7 -65 to +150 128 Unit V C mA TSTG IOUT
1A1 1A2
VBIAS1
1B1 1B2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
1OE
GND
1B3 1B4
GND
1A3 1A4
NOTES: 1. Stresses greater than those listed under ABSOLUTE 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. 2. Vcc, Control, and Switch terminals.
VCC
1B5 1B6
VCC
1A5 1A6
CAPACITANCE(1)
Symbol CIN CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. 6 12 Unit pF pF
GND
1B7 1B8
GND
1A7
NOTES: 1. Capacitance is characterized but not tested. 2. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V.
1A8 2A1 2A2
2B1 2B2
PIN DESCRIPTION
Pin Names 1A1-8, 2A1-8 1B1-8, 2B1-8 1OE, 2OE VBIAS I/O I/O I/O I I Description Bus A Bus B Bus Switch Enable (Active LOW) Precharge Reference Voltage
GND
2B3 2B4
GND
2A3 2A4
VCC
2B5 2B6
VCC
2A5 2A6
FUNCTION TABLE(1)
Inputs xOE L Connect A to B Disconnect A from B and Precharge Bus B to VBIAS H
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level
GND
2B7 2B8
GND
2A7 2A8 2OE
Outputs
GND
SSOP/ TSSOP/ TVSOP TOP VIEW
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IDT74FST163P245 16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol VIH VIL IIH IIL IOZH IOZL VIK IOFF ICC Parameter Control Input HIGH Voltage Control Input LOW Voltage Control Input HIGH Current Control Input LOW Current Current During Bus Switch Disconnect Clamp Diode Voltage Switch Power Off Leakage Quiescent Power Supply Current VCC = Min., IIN = -18mA VCC = 0V, VIN or VO 5.5V VCC = Max., VIN = GND or VCC VCC = Max., VO = 0 to 5V Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs VCC = Max. VI = VCC VI = GND Min. 2 -- -- -- -- -- -- -- -- Typ.(2) -- -- -- -- -- -- -0.7 -- 0.1 Max. -- 0.8 1 1 1 1 -1.2 1 3 V A A A Unit V V A
BUS SWITCH IMPEDANCE OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol RON IOS IO Parameter Switch On Resistance(2) Short Circuit Current(3) Precharge Outputs Current Test Conditions Vcc = Min., VIN = 0V, ION = 30mA Vcc = Min., VIN = 2.4V, ION = 15mA A(B) = 0V, B(A) = Vcc Vcc = Min., VBIAS = 2.4V, VO = 0V Min. -- -- 100 130 Typ. 5 10 -- 150
(1)
Max. 7 15 -- --
Unit mA A
NOTES: 1. Typical values are at Vcc = 5.0V, +25C ambient. 2. The voltage drop between the indicated ports divided by the current through the switch. 3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
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IDT74FST163P245 16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4,5) Total Power Supply Current(6) VCC = Max. VIN = 3.4V(3) VCC = Max., Outputs Open One Enable Pin Toggling 50% Duty Cycle VCC = Max., Outputs Open Two Enable Pins Toggling fi = 10MHz 50% Duty Cycle VIN = VCC VIN = GND VIN = VCC VIN = GND VIN = VCC VIN = 3.4V Test Conditions(1) Min. -- -- Typ.(2) 0.5 240 Max. 1.5 320 Unit mA A/ MHz/ Enable mA
IC
-- --
4.8 5.3
6.4 7.9
NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. TA = -40C to +85C 2. Typical values are at VCC = 5.0V, +25C ambient. 3. Per TTL driven input (VIN = 3.4V). All other inputs at VCC or GND. Switch inputs do not contribute to ICC. 4. This parameter represents the current required to switch the internal capacitance of the control inputs at the specified frequency. Switch inputs generate no significant power supply currents as they transition. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. 5. CPD = ICCD/VCC CPD = Power Dissipation Capacitance 6. IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ICC DHNT + ICCD (fiN) ICC = Quiescent Current ICC = Power Supply Current for a TTL High Input (VIN = 3.4V) DH = Duty Cycle for TTL Inputs High NT = Number of TTL Inputs at DH ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL) fi = Control Input Frequency N = Number of Control Inputs Toggling at fi
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| Description Data Propagation Delay A to B, B to A(2) Switch CONNECT Delay xOE to A or B Switch DISCONNECT Delay xOE to A or B Charge Injection During Switch DISCONNECT xOE to A or B(3) Min.(1) -- 1.5 1.5 -- Typ. -- -- -- 1.5 Max. 0.25 6.5 5.5 -- Unit ns ns ns pC
NOTES: 1. See test circuits and waveforms. 2. The bus switch contributes no Propagation Delay other than the RC Delay of the load interacting with the RC of the switch. 3. |QCI| is the charge injection for a single switch DISCONNECT and applies to either single switches or multiplexers. Charge injection is reduced because the injection from the DISCONNECT of the first path is compensated by the CONNECT of the second path.
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IDT74FST163P245 16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V CC 500 VIN Pulse Generator RT D.U.T. 50pF CL 500 OPPOSITE PHASE INPUT TRANSITION VOUT OUTPUT tPLH tPHL 7.0V SAME PHASE INPUT TRANSITION tPLH tPHL 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
Propagation Delay Test Circuits for All Outputs
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL SYNCHRONOUS CONTROL
tSU
tH
tREM
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
tSU
tH
Set-up, Hold, and Release Times
VCC ENABLE 1 MHz Signal Generator Enable/Select Switch In Switch In (MUX) (2)
(1)
DISABLE 3V 1.5V
Switch D.U.T. Out
VOUT
(3)
CONTROL INPUT CL = 50pF tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH 3.5V 1.5V tPHZ 0.3V 1.5V 0V tPLZ
0V 3.5V 0.3V VOL VOH 0V
Charge Injection
NOTES: 1. Select is used with multiplexers for measuring IQDCII during multiplexer select. During all other tests Enable is used. 2. Used with multiplexers to measure IQDCII only. 3. Charge Injection = VOUT CL, with Enable toggling for IQCII or Select toggling for IQDCII. VOUT is the change in VOUT and is measured with a 10M probe.
SWITCH OPEN
Enable and Disable Times
NOTES: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns.
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
1.5V
Pulse Width 5
IDT74FST163P245 16-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT XX FST Temp. Range XXX Family X Precharge XXX Device Type X Package
PV PA PF 245 P 163 74
Shrink Small Outline Package Thin Shrink Small Outline Package Thin Very Small Outline Package 16-Bit Flow Through Bus Switch
Precharge Double-Density Bus Switch -40C to +85C
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
for Tech Support: logichelp@idt.com (408) 654-6459
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