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Details, datasheet, quote on part number:74FST1632383
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Datasheet text preview:
IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
20-BIT BUS EXCHANGE SWITCH
IDT74FST1632383
FEATURES:
· · · ·
Bus switches provide zero delay paths Low switch on-resistance: 28 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 FST1632383 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 FST1632383 integrates terminating resistors in the device, thus eliminating the need for external 25 series resistors. It also provides four 4-bit TTL- compatible ports that supports 2 way bus exchange. The BX pin controls the bus exchange and the BE pin serves as the enable pin.
FUNCTIONAL BLOCK DIAGRAM
A0
C0
A5
C5
B0
D0
B5
D5
A4
C4
A9
C9
B4
D4
B9
D9
BX1 BE1
BX2 BE2
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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© 2002 Integrated Device Technology, Inc.
MAY 2002
DSC-5516/1
IDT74FST1632383 20-BIT BUS EXCHANGE 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
BE1 C0 A0 B0 D0 C1 A1 B1 D1 C2 A2 GND BE2 C5 A5 B5 D5 C6 A6 B6 D6 C7 A7 GND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Vcc D4 B4 A4 C4 D3 B3 A3 C3 D2 B2 BX1 Vcc D9 B9 A9 C9 D8 B8 A8 C8 D7 B7 BX2
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.
CAPACITANCE(1)
Symbol CI N CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. 4 Unit pF pF
NOTES: 1 . Capacitance is characterized but not tested. 2 . TA = 25°C, f = 1MHz, VIN = 0V, VOUT = 0V.
PIN DESCRIPTION
Pin Names A0-9, B0-9 C0-9, D0-9 BE1,2 BE1,2 I/O I/O I/O I I Buses A, B Buses C, D Bus Switch Enable (Active LOW) Bus Exchange Description
FUNCTION TABLE(1)
BE1 H L L BE2 H L L BX1 X L H BX2 X L H A0-4 Z C0-4 D0-4 A5-9 Z C5-9 D5-9 B0-4 Z D0-4 C0-4 B5-9 Z D5-9 C5-9 Description Disconnect Connect Exchange Description Disconnect Connect Exchange
SSOP/ TSSOP TOP VIEW
NOTE: 1 . H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High-Impedance
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IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = 40°C to +85°C, VCC = 5.0V ± 10%
Symbol VIH VIL IIH IIL IOZH IOZL IOS VIK RON IOFF ICC Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current (3-State Output Pins) Short Circuit Current Clamp Diode Voltage Switch On Resistance(4) Input/Output Power Off Leakage Quiescent Power Supply Current Vcc = Max., VO = GND(3) VCC = Min., IIN = 18mA Vcc = Min., VIN = 0V, ION = 30mA Vcc = Min., VIN = 2.4V, ION = 15mA VCC = 0V, VIN or VO 4.5V VCC = Max., VI = GND or VCC VCC = Max. Test Conditions(1) Guaranteed Logic HIGH for Control Inputs Guaranteed Logic LOW for Control Inputs VCC = Max. VI = VCC VI = GND VO = VCC VO = GND Min. 2 -- -- -- -- -- -- -- 17 20 -- -- Typ.(2) -- -- -- -- -- -- 300 0.7 28 35 -- 0.1 Max. -- 0.8 ±1 ±1 ±1 ±1 -- 1.2 40 48 ±1 3 mA V µA µA µA Unit V V µA
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, +25°C ambient. 3 . Not more than one output should be shorted 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.
POWER SUPPLY CHARACTERISTICS
Symbol ICC ICCD Parameter Quiescent Power Supply Current TTL Inputs HIGH Dynamic Power Supply Current(4) VCC = Max. VIN = 3.4V(3) VCC = Max. Outputs Open Enable Pin Toggling 50% Duty Cycle VCC = Max. Outputs Open Enable Pins Toggling (20 Switches Toggling) fi = 10MHz 50% Duty Cycle VIN = VCC VIN = GND Test Conditions(1) Min. -- -- Typ.(2) 0.5 30 Max. 1.5 40 Unit mA µA/ MHz/ Switch mA
IC
Total Power Supply Current(5)
VIN = VCC VIN = GND VIN = VCC VIN = 3.4V
--
6
8
--
6.5
9.5
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, +25°C 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 . 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 All currents are in milliamps and all frequencies are in megahertz.
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IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40°C to +85°C, VCC = 5.0V ± 10%
Symbol tPLH tPHL tBX tPZH tPZL tPHZ tPLZ |QCI | |Q D C I| Description(1) Data Propagation Delay Ax to Cx, Dx and/or Bx to Cx and/or Dx(3,4) Switch Multiplex Delay BX to Ax, Bx, Cx, Dx Switch Turn On Delay BE to Ax, Bx, Cx, Dx Switch Turn Off Delay BE to Ax, Bx(3) Charge Injection, Typical(5,6) Charge Injection, Typical(6,7) Condition CL = 50pF RL = 500 Min. -- 1.5 1.5 1.5 -- -- Typ. -- -- -- -- 1.5 0.5 Max. 1.25 7.5 7.5 5.5 -- -- Unit ns ns ns ns pC
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 10 M scope probe, VIN = 0.0 volts. 6 . Characterized parameter. Not 100% tested. 7 . Measured at switch turn off through bus multiplexer, (e.g.- A to C = >A to D), load = 50 pF in parallel with 10 M scope probe, VIN at A = 0.0 volts. Charge injection is reduced because the injection from the turn off of the A to C switch is compensated by the turn on of the B to C switch.
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IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V CC 500 VIN Pulse Generator RT D.U.T. 50pF CL 500 V OU T 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Octal link
Test Circuits for All Outputs
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC.
tSU
tH
tREM
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
Octal link
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
Octal link
1.5V
1.5V
tSU
tH
Pulse Width
Set-up, Hold, and Release Times
ENABLE SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL 3V 1.5V 0V VOH 1.5V VO L 3V 1.5V 0V
Octal link
DISABLE 3V 1.5V 0V 3.5V 0.3V tPHZ 0.3V 1.5V 0V VOH 0V
Octal link
CONTROL INPUT tP Z L OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 3.5V 1.5V tP L Z
V OL
Propagation Delay
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.
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