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20-BIT BUS EXCHANGE SWITCH
IDT74FST163383 IDT74FST1632383 ADVANCE INFORMATION
FEATURES:
* Bus switches provide zero delay paths * Extended commercial range of -40C to +85C * Low switch on-resistance: FST163xxx - 5 FST1632xxx -- 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, TSSOP and TVSOP
DESCRIPTION:
The FST163383/1632383 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 FST1632xxx integrates terminating resistors in the device, thus eliminating the need for external 25 series resistors. The FST163383 and FST1632383 each provide four 4-bit TTL- compatible ports that support 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 BX1 BE1
D4
B9 BX2 BE2
D9
3474 drw 01
PIN DESCRIPTION
Pin Names A0-9, B0-9 C0-9, D0-9 I/O I/O I/O I I Description Buses A, B Buses C, D Bus Switch Enable (Active LOW) Bus Exchange
3474 tbl 01
BE1,2
BX1,2
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
(c)1997 Integrated Device Technology, Inc.
MAY 1996
DSC-3474/4
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IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH
COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATION
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 SO48-1 SO48-2 SO48-3 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 Vcc D4 B4 A4 C4 D3 B3 A3 C3 D2 B2 BX1
ABSOLUTE MAXIMUM RATINGS(1)
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
3474 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.
CAPACITANCE(1)
Symbol CIN CI/O Parameter Control Input Capacitance Switch Input/Output Capacitance Switch Off Conditions(2) Typ. Unit 4
pF pF
3474 tbl 03
Vcc D9 B9 A9 C9 D8 B8 A8 C8 D7 B7 BX2
NOTES: 1. Capacitance is characterized but not tested. 2. TA = 25C, f = 1MHz, VIN = 0V, VOUT = 0V
FUNCTION TABLE BE BX1 A0-4 BE1
H L L X L H BX2 X L H Hi-Z C0-4 D0-4 A5-9 Hi-Z C5-9 D5-9
B0-4 Hi-Z D0-4 C0-4 B5-9 Hi-Z D5-9 C5-9
Description Disconnect Connect Exchange Description Disconnect Connect Exchange
3474 tbl 04
BE BE2
H L L
SSOP/ TSSOP/TVSOP TOP VIEW
3474 drw 02
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IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE 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 ICC Input/Output Power Off Leakage Quiescent Power Supply Current VCC = 0V, VIN or VO 4.5V VCC = Max., VIN = GND or VCC 163xxx 1632xxx 163xxx 1632xxx 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. 2.0 -- -- -- -- -- -- -- -- 17 -- 20 -- -- Typ.(2) -- -- -- -- -- -- 300 -0.7 5 28 10 35 -- 0.1 Max. -- 0.8 1 1 1 1 -- -1.2 7 40 15 48 1 3 A A
3474 tbl 05
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.
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IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE 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 (20 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
--
6.0
8.0
--
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, +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.
3474 tbl 06
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Commercial: TA =-40C to +85C, VCC = 5.0V 10%
163383 Symbol tPLH tPHL tBX tPZH tPZL tPHZ tPLZ |QCI| |QCDI| Description Data Propagation Delay Ai to Ci, Di Bi to Ci, Di(3,4) Switch Multiplex Delay BX to Ai, Bi, Ci, Di Switch Turn on Delay BE to Ai, Bi, Ci, Di Switch Turn off Delay BE to Ai, Bi (3) Charge Injection, Typical(5,7) Charge Injection, Typical(6,7) Condition(1) CL = 50pF RL = 500 Min.(2) -- 1.5 1.5 1.5 -- -- Typ. -- -- -- -- 1.5 0.5 0.25 6.5 6.5 5.5 -- -- 1632383 1.25 7.5 7.5 5.5 -- -- Unit ns ns ns ns pC Max.
3474 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 10 M scope probe, VIN = 0.0 volts. 6. 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. 7. Characterized parameter. Not 100% tested.
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IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE 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
3474 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
3474 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
3474 lnk 04
PULSE WIDTH
tH
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
1.5V
tREM
1.5V
3474 lnk 05
tSU
tH
PROPAGATION DELAY
3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
3474 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
3474 lnk 07
SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL
CONTROL INPUT tPLZ 3.5V 1.5V tPHZ 0.3V
0V 3.5V 0.3V VOL VOH
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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IDT74FST163383, IDT74FST1632383 20-BIT BUS EXCHANGE SWITCH
COMMERCIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT XX FST 16 XX Temp. Range Device Type X Package
PV PA PF
Shrink Small Outline Package (SO48-1) Thin Shrink Small Outline Package (SO48-2) Thin Very Small Outline Package (SO48-3)
163383 1632383
20-Bit Bus Exchange Switch
74
-40C to +85C
3474 drw 08
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