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16-BIT BUS SWITCH
IDT74FST163245 IDT74FST163P245 ADVANCE INFORMATION
Integrated Device Technology, Inc.
FEATURES:
* Bus switches provide zero delay paths * Extended commercial range of -40C to +85C * Low switch on-resistance: FST163xxx - 5 FST163Pxxx - 5 with precharge * 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, TSSOP and TVSOP
DESCRIPTION:
The FST163245/163P245 belong 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 gate-to-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 FST163245 and FST163P245 are 16-bit TTL-compatible bus switches. The OE pins provide enable control. The FST163P245 supports precharge on the B port. So when OE is high, A and B ports are isolated and B outputs are precharged to the bias voltage through the equivalent of a 10K resistor (1B1-8 precharged to VBIAS1 and 2B1-8 precharged to VBIAS1).
FUNCTIONAL BLOCK DIAGRAM
VBIAS1
1A1 1A1 1B1 1A8 1A8 1B8
1B1
1B8 VBIAS1
2A1
2B1
2A1
2B1
2A8 1OE 2OE FST163245
2B8
2A8 1OE 2OE FST163P245
2B8
PIN DESCRIPTION
Pin Names 1A1-8, 2A1-8 1B1-8, 2B1-8 1OE, 2OE VBIAS1 I/O I/O I/O I I Description Bus A Bus B Bus Switch Enable (Active LOW) Precharge Reference Voltage
3513 tbl 01 The IDT logo is a registered trademark of Integrated Device Technology, Inc.
3513 drw 01
COMMERCIAL TEMPERATURE RANGE
(c)1997 Integrated Device Technology, Inc.
FEBRUARY 1997
DSC-3513/-
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IDT74FST163245, IDT74FST163P245 16-BIT BUS SWITCH
COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATION
*NC/**VBIAS1
1B1 1B2
ABSOLUTE MAXIMUM RATINGS(1)
48 47 46 45 44 43 42 41 40 39 38
1OE 1A1 1A2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SSOP/ TSSOP/TVSOP TOP VIEW
Symbol Description VTERM(2) Terminal Voltage with Respect to GND TSTG Storage Temperature IOUT Maximum Continuous Channel Current
Max. -0.5 to +7.0 -65 to +150 128
Unit V C mA
GND
1B3 1B4
GND
1A3 1A4
VCC
1B5 1B6
VCC
1A5 1A6
3513 tbl 02 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 condiitions for extended periods may affect reliability.
2. VCC, Control and Switch terminals.
GND
1B7 1B8
GND
1A7
CAPACITANCE(1)
Symbol CIN CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. Unit 4
pF pF
3513 tbl 04
SO48-1 SO48-2 SO48-3
37 36 35 34 33 32 31 30 29 28 27 26 25
1A8 2A1 2A2
2B1 2B2
NOTES: 1. Capacitance is characterized but not tested 2. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V
GND
2B3 2B4
GND
2A3 2A4
FUNCTION TABLE
Inputs xOE OE L H Outputs Bus B Data to Bus A High Z State (163245) Precharge Bus B to VBIAS (163P245)
3513 tbl 03
VCC
2B5 2B6
VCC
2A5 2A6
GND
2B7 2B8
GND
2A7 2A8 2OE
*NC/**GND
3513 drw 02
*FST163245 **FST163P245
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IDT74FST163245, IDTFST163P245 16-BIT BUS SWITCH
COMMERCIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Commercial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol VIH VIL II H II L IOZH IOZL IOS VIK RON Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Voltage High Impedance Output Current (3-State Output pins) Short Circuit Current Clamp Diode Voltage Switch On Resistance(4) VCC = Max., VO = GND(3) VCC = Min., IIN = -18mA VCC = Min. VIN = 0.0V ION = 30mA VCC = Min. VIN = 2.4V ION = 15mA IOFF IO ICC Input/Output Power Off Leakage Precharge Output Current (5) Quiescent Power Supply Current VCC = 0V, VIN or VO 4.5V VCC = Min., BIASV = 2.4V, VO = 0V VCC = Max., VIN = GND or VCC 163xxx, 163Pxxx 163xxx, 163Pxxx -- 0.15 -- -- -- 0.1 1 -- 3 A mA A
3513 tbl 05
Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs VCC = Max. VCC = Max. VI = VCC VI = GND VO = VCC VO = GND
Min. 2.0 -- -- -- -- -- -- -- -- --
Typ.(2) -- -- -- -- -- -- 300 -0.7 5 10
Max. -- 0.8 1 1 1 1 -- -1.2 7 15
Unit V V A A mA V
NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at VCC = 5.0V, +25C ambient. 3. Not more than one output should be tested at one time. Duration of the test should not exceed one second. 4. Measured by voltage drop between ports at indicated current through the switch. 5. This parameter applies to the FST163P245 only.
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IDT74FST163245, IDT74FST163P245 16-BIT BUS SWITCH
COMMERCIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) Test Conditions(1) VCC = Max. VIN = 3.4V(3) VCC = Max. Outputs Open Enable Pin Toggling 50% Duty Cycle VCC = Max. Outputs Open Enable Pins Toggling (16 Switches Toggling) fi = 10MHz 50% Duty Cycle Min. -- -- Typ.(2) 0.5 30 Max. 1.5 40 Unit mA A/ MHz/ Switch mA
VIN = VCC VIN = GND
IC
Total Power Supply Current (6)
VIN = VCC VIN = GND VIN = 3.4 VIN = GND
--
4.8
6.4
--
5.3
7.9
NOTES: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type. 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. 4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. 5. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested. 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 = Input Frequency N = Number of Switches Toggling at fi All currents are in milliamps and all frequencies are in megahertz.
3513 tbl 06
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Commercial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ |QCI| Description Data Propagation Delay Ai to Bi, Bi to Ai(3,4) Switch Turn on Delay OE to Ai, Bi Switch Turn off Delay OE to Ai, Bi Charge Injection (5,6) Condition(1) CL = 50pF RL = 500 Min.(2) -- 1.5 1.5 -- Typ. -- -- -- 1.5 Max. 0.25 6.5 5.5 -- Unit ns ns ns pC
3513 tbl 07
NOTES: 1. See test circuit and waveforms. 2. Minimum limits guaranteed but not tested. 3. This parameter is guaranteed by design but not tested. 4. The bus switch contributes no propagation 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 2.5ns for 50pF load. Since this time is constant and much smaller than the rise/fall times of typical driving signals, it adds very little propagation delay to the system. Propagation delay on 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. 5. Measured at switch turn off, load = 50 pF in parallel with 10M scope probe, VIN = 0.0 volts. 6. Characterized parameter. Not 100% tested.
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IDT74FST163245, IDTFST163P245 16-BIT BUS SWITCH
COMMERCIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS TEST CIRCUITS FOR ALL OUTPUTS
VCC 500 VIN Pulse Generator RT D.U.T. 50pF CL 500 VOUT 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Open
3513 lnk 08 DEFINITIONS: CL= Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Switch
Closed
3513 lnk 03
SET-UP, HOLD AND RELEASE TIMES
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC. tSU 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
3513 lnk 04
PULSE WIDTH
tH
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
tREM
1.5V
tSU
tH
3513 lnk 05
PROPAGATION DELAY
3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
3513 lnk 06
ENABLE AND DISABLE TIMES
ENABLE DISABLE 3V 1.5V tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 1.5V 0V 0V 3.5V 1.5V tPHZ 0.3V VOH tPLZ 0V 3.5V 0.3V VOL
SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL
CONTROL INPUT
3513 lnk 07 NOTES: 1. Diagram shown for input Control Enable-LOW and input Control DisableHIGH 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns
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IDT74FST163245, IDT74FST163P245 16-BIT BUS SWITCH
COMMERCIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT XX FST 16 XX Temp. Range Device Type X Package
PV PA PF 163245 163P245
Shrink Small Outline Package (SO48-1) Thin Shrink Small Outline Package (SO48-2) Thin Very Small Outline Package (SO48-3) 16-Bit Bus Switch 16-Bit Bus Switch with Precharge
74
-40C to +85C
3513 drw 08
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