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IDT74FST163212 24-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
24-BIT BUS EXCHANGE SWITCH
IDT74FST163212
FEATURES:
* * * *
Bus switches provide zero delay paths Low switch on-resistance; 4 TTL-compatible input and output levels ESD > 2000V per MIL-STD-883, Method 3015; > 200V using machine model (C = 200pF, R = 0) * Available in SSOP and TSSOP packages
DESCRIPTION:
The FST163212 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 FST163212 provides four 12-bit TTL- compatible ports that support 2 way bus exchange. The S0-2 pins control the bus exchange and switch enable functions.
FUNCTIONAL BLOCK DIAGRAM
One of 12 Channels
1A 1 1B 1
1A 2
1B 2
Flow Control S0 S1 S2
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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(c) 2002 Integrated Device Technology, Inc.
MAY 2002
DSC-3508/1
IDT74FST163212 24-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
S0
1A1 1A2 2A1 2A2 3A1 3A2
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
56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 S1 S2
1B1 1B2 2B1 2B2 3B1
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
TSTG IOUT
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.
GND
4A1 4A2 5A1 5A2 6A1 6A2 7A1 7A2
GND
3B2 4B1 4B2 5B1 5B2 6B1 6B2 7B1 7B2 8B1
CAPACITANCE(1)
Symbol CIN CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. 6 17 Unit pF pF
NOTES: 1. Capacitance is characterized but not tested. 2. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V.
PIN DESCRIPTION
Pin Names A1, A2 B1, B2 S0 - 2 I Control Pins for MUX and Switch Enable Functions I/O I/O Description Buses A1, A2, B1, B2
VCC
8A1
GND
8A2 9A1 9A2 10A1 10A2
GND
8B2 9B1 9B2 10B1 10B2
FUNCTION TABLE(1)
S2 L L L L H H H H S1 L L H H L L H H S0 L H L H L H L H A1 Z B1 B2 Z Z Z B1 B2 A2 Z Z Z B1 B2 Z B2 B1 Description Disconnect A1 to B1 A1 to B2 A2 to B1 A2 to B2 Disconnect A1 to B1, A2 to B2 A1 to B2, A2 to B1
11A1 11A2 12A1 12A2
11B1 11B2 12B1 12B2
SSOP/ TSSOP TOP VIEW
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level Z = High-Impedance
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IDT74FST163212 24-BIT BUS EXCHANGE 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 Parameter Switch On Resistance(2) Short Circuit Current, A to B(3) Test Conditions Vcc = Min., VIN = 0V, ION = 64mA Vcc = Min., VIN = 0V, ION = 30mA Vcc = Min., VIN = 2.4V, ION = 15mA A(B) = 0V, B(A) = Vcc Min. -- -- -- 100 Typ. 4 4 10 --
(1)
Max. 7 7 15 --
Unit mA
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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IDT74FST163212 24-BIT BUS EXCHANGE 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 Select Pin Toggling 50% Duty Cycle VCC = Max., Outputs Open Select Pins Toggling (24 Switches Toggling) fi = 10MHz 50% Duty Cycle VIN = VCC VIN = GND VIN = VCC VIN = GND VIN = 3.4V VIN = GND Test Conditions(1) Min. -- -- Typ.(2) 0.5 30 Max. 1.5 40 Unit mA A/ MHz/ Switch mA
IC
--
7.2
9.6
--
7.7
11.1
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 tBX tPZH tPZL tPHZ tPLZ |QCI| |QDCI|
NOTES:
VCC = 5V 10% Description(1) Data Propagation Delay A to B, B to A(2) Switch Multiplex Delay S to A, B Switch Turn OnDelay S to A, B Switch Turn OffDelay S to A, B Charge Injection During Switch DISCONNECT S to A or B(3) Charge Injection During Switch Exchange S to A or B(3) Min. -- 1.5 1.5 1.5 -- -- Typ. -- -- -- -- 1.5 0.5 Max. 0.25 6.5 6.5 7 -- --
VCC = 4V Max. 0.25 7 7 7 -- -- Unit ns ns ns ns pC pC
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. |QDCI| is the charge injection for a multiplexer as the multiplexed port switches from one path to another. 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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IDT74FST163212 24-BIT BUS EXCHANGE 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
IDT74FST163212 24-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT XX FST Temp. Range XXX Family XXX Device Type X Package
PV PA
Shrink Small Outline Package Thin Shrink Small Outline Package
212 163 74
24-Bit Bus Exchange Switch
Double-Density Bus Switch -40C to +85C
DATA SHEET DOCUMENT HISTORY
5/24/2002 Removed TVSOP package
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for Tech Support: logichelp@idt.com (408) 654-6459
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